Maf tuning with stft. on my final step of SD tuning the truck was great.
Maf tuning with stft I can usually MAF tune a car in under an hour. 121] > 14. It emphasizes reading help files and documentation to understand the software before starting. 9 and typically ends for me @ 6. Fuel trim trend with this calibration seems good but there were a few blips when STFT reads very high, up to +30 high maximum and -25 low maximum. If I'm adjusting VE for target AFR, along with PE, under what circumstances would the MAF need tuned? It seems like people tune the MAF for AFR purposes, but isn't that sorted out by VE unless something with the MAF is off? I've uploaded the tune file. Im trying to tume my maf but it seems to be 2 steps forward 3 steps back when i change anything. I then drive the car about 20-30 miles, varying the load as much as possible. 2v should not be a lower kg/hr reading that 1. If I was you I would put the narrowband o2's back in and start logging your stft and maf in your chart so you can dial in your maf curve. They get more and more precise over time as the PCM spends more time in a given cell. Once you get the VE tables dialed in, plug the MAF back in. Save this tune with the changes above as MAF-1 or something OTHER THAN your current tune. Currently using excel to scale period and lbs. the only time these cars run in open loop is for cold starts. In " EC Tunes MAF tuning made easy" he has you turn off the LTFT then tuning the MAF table. Disable 4000rpm, Re-Enable 3900. I personally smooth each time, but I don't think it's necessary. I thought it would stay all 1s since that's what I had it set at in the tune. Hey guys, I'm new to tuning (which I'm sure you hear a lot) and I'm currently working on a tune for my lnf. HOT to 100% isn't a bad idea for idle and cruising STFTs or maf. Also, how do I log my dynamic airflow in the Maf hz histogram. Warm up the vehicle to operating temperature and reset the STFT fuel trims. 02NBMFormula. Under Airflow tab, open the MAF Correction "BASE" table. i donno if i did my car the correct way last night, but it runs like a scalded dog compared to the night before. I think I have one more run on another day with the VE and it will be perfect, with the changes I just made I should be within +1 - (-2), doing one more just to try and get even closer, if not this is good enough For your MAF, I’d suggest making your fueling adjustments using your STFT and not LTFT. lol Forgive my ignorance. What I need now is some more data to refine the automation and test to see if it works well with different size MAFs and different setups. So i have the VVE tuned good now Im going to move onto the MAF. I'm about to begin the MAF tuning, so I was wondering if their was anything special I needed to do to the table before or during the process to show the BOV being present? Apr 12, 2023 · Post a log, STFT should be around 1 when you log. 6)". Short term fuel trims make for much more accurate VE tuning as their correction is closer to cell correction (IS cell correction if logs require large hit-counts to show up like 35 or higher) than the LT trims. My wideband reads pretty consistent mid 14s:1 on all of my tune drives unless PE is active. I'm also logging LTFT+STFT against the MAF freq columns. A rough VE table will be more susceptible to burst knock retard. How do adding larger injectors to naturally aspirated coyote leffect the stft? I bought some ID1000s, changed injector settings, even spoke to injectors dynamics who said my injector settings are right. the maf is slightly bigger. Mar 2, 2022 · Use STFT+LTFT to tune maf. I have been using this method with Sirius' applicable filters for MAF on my gen 3 with success. on my final step of SD tuning the truck was great. when tuning my VE table using a wideband and following the instructions in the help file should i disable STFT Openloop? I've disabled the MAF and LTFT, DFCO, and am wondering if disabling STFT would make tuning easier. I went out and logged my wideband vs. TABLE Maf idle and cruising starts at 1. It goes into limp mode immediately. I run a scan, check Histogram #8 for MAF-STFT, note the cells that are above 0, copy the cells and special paste by half into MAF Calibration in the VCM Editor, run a compare against the stock scan and Jul 3, 2015 · I feel like I take 1 step forward and 2 steps back. 0-6. Do I do the tuning the same way by logging the STFT historgram when turning the MAF or is there something else that I log when tuning the MAF? Also on your original response you said, "maybe 10 and best to filter on PE (AFR >14. MAF frequency and then applied that to the table (Multiply by half %) but I noticed it didn't change my idle AFR at all, even though it subtracted a substantial amount. If the MAF meter, air lid, air intake, or air filter has been modified than the MAF Airflow vs. xml. Setting P. back on and truck ran super good for 24 hrs. Seemed the most basic to start out with. Oct 1, 2010 · I have been tuning these cars now for at least 4 years and there is no reason other then a maf failing to tune the V/E table. Right now I'm running a zzp tune with a MAF relocate and external BOV. I see from your posts that you have transitioned from EFI to HPT. MAF Tuning is the same thing. 08. Jan 4, 2016 · Anyways ive got a e38 ecm tbss. Your graphs will then log fueling errors like they typically do using any of the other tuning methods. I was pretty simple more air mass means cooler wire means more voltage. 98 or 1. I spent a few hours using the LTFT + STFT custom PID to dial in about 90% of the VE tables on a Cavalier recently. If you want to tune in the VE tablethen yes, the MAF needs to be shut off and the pid removed from your scanner. Jun 10, 2015 · Either way should work, STFT's with LTFT's disabled, LTFT's only, or average of STFT+LTFT's, you're applying the fuel trim error% anyways to the MAF period, to derive your MAF curve according to what the fuel trims are adding/removing from your fueling in close loop. View Profile View Forum Posts Private Message Nov 13, 2010 · Okay my hp tuner editor doesn't give me the option for idle airflow tuning or dynamic airflow tuning. We use closed-loop STFT data Feb 7, 2018 · Got in touch with the developer and was able to use the tool on Maf. 24 only has MAF Hz, so you create a user defined PID for MAF Period by 1000000/[PID. Regarding your question about fluctuations, there will always be some fluctuation in STFT's. once done plug the solenoid back in and double check the ltft and stft are happy. Well, Stupid me deleted the file and now I need it! Does anyone have a . turned MAF and STFT and LTFT ect. I'm gonna do it though on a 2007 3v 4. Did every thing by the book. pl Apr 11, 2020 · Building a fast car? Get $400 OFF the all-inclusive VIP online course package deal: https://hpcdmy. The other stuff you have disabled is correct to tune using STFT's. Now flash (write calibration only) this tune (MAF-1) to your truck. Using the STFT vs Maf histograms you be able to dial in your maf and get your LTFTs no more then a couple percent. EN. 04-22-2009 #18 KLUG'S SS Feb 12, 2024 · Update for the gen3 crowd. 22:02: They have a built in MAF channel that just simply provides the data that we need there. Every time I think I understand something about tuning my car, something happens that goes against what I thought I knew. MAF Freq. in Hz. Apr 6, 2007 · If using a MAF sensor, only tune the idle and part throttle areas of the VE table, 4000rpm and below. So, I will re-load this No MAF tune in the morning and make sure closed loop is ON. May 6, 2008 · When I first got started I did all the guides and did the open loop thing and tried all the different ways of doing it. 02 to add 2% more fuel over the whole table for a starting point looking at that. This is my first experience with any kind of electronic tuning, and this forum has been my main source of info and a huge help - there's an amazing amount of knowledge here! Mar 29, 2010 · Highlight the first cell of the MAF Calibration 2 table and paste the modified cells. It really depends on how you scale it. It can also lead to LTFT+STFT being misleading if you are not paying attention to both separately. You use them to tune in your fueling. Table Jun 19, 2015 · 1. Feb 19, 2012 · Not only that, but you need to set the pcm in whatever mode you are trying to tune. The 3v is not very similar to GM tuning. There are multiple ways to skin this proverbial cat. LTFT take a lot longer LTFT plus STFT and you can see in brackets it says MAF. But once in second the stft were basicly off and it commanded what i wanted. I will try to smooth it out a High MAF tables have been adjusted to get WOT AFR in the 12:5 to 12:9 range. Hz cars. Im new to tuning but not clueless. I have been chasing KR and I think some of it is now false knock, but I'm not 100% positive. STFT is on, LTFT and DFCO is off. View Profile View Forum Posts Mar 18, 2011 · MAF is the first place I started. Feb 21, 2013 · If you're getting 35% STFT, and 0% LTFT, your LTFTs have not settled yet or your have some very erratic MAF curve caused by poor MAF sensor location after a bend or some other flow obstruction causing turbulence. I was supposed to use it to tune my MAF table. 4 and found "{B5001} MAF Calibration Table - LTFT Bank 1%" I did a search and didn't find alot of info on tuning this way. Input the data. v style maf and the tool will work out of the get go. I am used to tuning Fords and am new to the GM vehicles. LS1Tech. Dustin Mar 28, 2013 · I've already tuned the MAF and it looked pretty good. Sep 9, 2010 · You are supposed to sum your LTFT and STFT to get the multiplier, but if you break in your map right, your STFT's should be close to zero, and then LTFT's are pretty damn close. You may need to revisit the MAF curve after tuning the VVE, but if you do, the touchup will likely be minor. It was a turbulent range of the intake I had issues with. I never see EQ Cmd go over 1, even at idle. Jan 2, 2013 · If you have a MAF that flows over 64 lbs/min (1,750 kg/hr) for EEC-V or PowerPC; or 86 lbs/min (2,350 kg/hr) for EEC-IV or Coyote ECU's you will have to scale your tune. Get 50% MAF / LTFT tuning So most guides go something like this: Disable (Almost completely) power enrichment by some means, reset fuel trims, drive for 30ish minutes while graphing LTFT against MAF Hz. Do not overwrite your current saved tune! - very important as you will want to cut and paste the tuned MAF table back into this tune once all is done. Seems like from my research that the only way to disable the MAF in my 2006 is to set all ZERO's in the Hz table, turn off P101,102 and 103 codes and raise the PE limit enough to keep it out of the way while I do some low-mid power logging of both LTFT's and STFT's. The STFT will allow you to adjust fueling throughout your MAF frequencies with more granularity and accuracy during part throttle (non PE) driving. This needs to be a LONG log and make sure there are no drops in kg/hr for higher voltages ie. Use your the EFILive scanner to create the BEN factor for the MAF retune. Open loop works great, if you have a wideband. Set the PE to your commanded afr by dividing stoich by 14. So here is my idea and tell me if I'm silly I made a filter on my LTFT+STFT histogram as so: "((Equivalence Ratio Commanded)-(WB Bank1&2 AVG))^2<. The combination of STFT and LTFT is what is applied to the actual injection calculation. (X axis) and STFT (Y axis). ----- Adding MAF Fuel Trim Graph: Step 1: Go to your "Graph" tab, right click and select "Graphs Layout". I found a great video posted by Caraddict on YouTube essentially walking through the May 22, 2020 · could someone help me out here please, Ive been trying to tune the maf and ve tables and after datalogging and making changes to tables I proceed to get the same information time after time, Obviously I don't have something setup correctly, Ive gone over all steps to shutting off the proper items such as maf frequency fail high and dtcs for the VE tuning process, got my p102 & 103codes along Apr 3, 2010 · When I has the Hahn CAI & MAF on it, I would get the LTFT's pretty close until I cruised around 80, (~5k MAF freq) then they would go negative 3-4 until I worked out the STFT in the cells on the correction table. Frequency table will need modification. com - GM LS Performance Forum à® Sep 2, 2024 · there are 2 ways you can tune the MAF Transfer. I just looked at the log file, and the STFT's are up and down as you say, but the LTFT's are all zeros. Is it possible to do MAF tuning without a wideband O2 sensor? My LTFT's seem OK (between -5% and +5%), but at times, my STFT's seem a little far away from 0 and I'm not sure what to log/how to setup a histogram to tune the MAF table. Set up your VCM Scanner: May 29, 2017 · i am trying to figure out how to tune my maf. STFT's are of no use there. You don't tune these. just getting back in the tuning game since im throwing a new Cam in my CTS-V and did it the old school way last time with MAF then disable half the damn program to run MAF-less and tune VVE. 2302]. Apr 1, 2020 · Extremely green in this section, worked on cars my whole life but never got into tuning with HPtuners. I don't think using his config will work unless you create the MAF Period PID first. I special paste my stft results but my trims are always spread far. Use the wideband and filtering to tune LWFM. MAF Tuning – In Work 1. output frequency, bank 1 and 2 keep going complete opposite of one another so I decided to tune by just bank 1. The car starts and runs fine. . 45 - 0. How to Tune MAF in stock location: *Set the entire Maf Correction Table to 1's. 83 commanded lambda seems to be affected by the stft value. Hey guys, I'm working through the process of VVE tuning, and have come up with a couple questions I'd like to run by the experts. I was hoping the OEM MAF calibration would get me close enough. On my 2018 gmc sierrw l83 I can't get the STFT to disable to do maf tuning. Thread Tools. Oct 19, 2017 · Hello CivicX brothers and sisters, Can anyone provide help/info on MAF scaling for my SI. This will be a regularily used function for me. LTFT is slow so if it is able to keep STFT around 1-2% the MAF curve is accurate. The STFT change constantly which are then incorporated into the LTFT. MAF Calibration Steps: 1) Go into your editor. I followed Goat Rope Garage on Youtube. The histo is set up to log STFT bank1 against MAF airflow vs. Jul 4, 2024 · If I am in SD or MAF my WB registers 14. ) and then tune the MAF in MAF only mode and dial that in, the two will play nice together. I've had 3 consistance logs after I made the MAF changes. This is totally normal. 07 - 1. That is way over simplified, but there are a ton of threads about MAF tuning and a ton of threads about using histograms. There's nothing bad about driving with the MAF only, and it is a LOT faster to tune. Now tune only the MAF table to get the fueling back to the same range. But when I set the maf correction table to 1s, I notice that when I have tried to get my maf cal dialed in the maf correction has been changing some on its own on the tune. cfg file a while back that had only 2 histograms, 1 LTFT and 1 STFT vs. Do this after the VE table has been corrected. I've got LTFT's disabled, and tuning strickly on the STFT's. comCheck out the latest tuni Hey guys, I've been trying to dial in my MAF for quite some time now using the LTFT, and LTFT+STFT. Sep 18, 2023 · L99 A6 - DSS FX Forged Piston's, Eagle ESP L19 Rods, ARP Head and Main Studs, LS9 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnion Upgrade, TSP Chrome Molly Pushrods, BTR . Can someone give me a good, reliable method for tuning the MAF on the coyote? I've been using STFT as a correction factor and it doesn't seem consistent enough. in my personal experience i get better low end and mid throttle range (basically everything thats not WOT) results if i tune with STFT. This is meant to serve as a basic how-to for setting up a MAF fuel trim Graph (or graphs) in VCM Scanner V3. The tool will be more useful for those that want to use a larger MAF housing, etc. Scan and tune are included. Life is much simpler with the MAF relocated to the lower CP. Do a MAF g/s datalog start in 2nd @ 3-5mph, and slowing accelerate just past 100 g/s a bit. Open and closed loop fueling are also explained. in sd the truck runs amazing. I tried changing playing with the Dynamic airflow enable and disable rpm, no dice. May 10, 2017 · Don't I need a number like . 001". 608 114 LSA cam, Ford red top injectors, Supra TT pump, Corvetter regulator (58PSI cold, falling to 55PSI warm,) 1 3/4" longtubes into a 3. First way is the trid a true way which is to shut off adaptive learning & Disable LTFT to dial in using STFT's. RML_s13. I understand the basics of how to find find where my LTFT and STFT are by disabling the MAF and going into SD and making the low octane table the same as the high octane. Table. Recommended way to tune is to turn off LTFT's by settings LTFT fields in ktuner to 0%. As soon as I enable the MAF, STFT, and LTFT my WB shows lean but my scanner is showing my fuel trims are rich. Mar 15, 2011 · I run a scan, check Histogram #8 for MAF-STFT, note the cells that are above 0, copy the cells and special paste by half into MAF Calibration in the VCM Editor, run a compare against the stock scan and smooth out using the 'Smooth Selelection' button. Jun 30, 2024 · The stock mass air flow calibration is correct +-4% as long as nothing in the intake tract has been modified. Period tables, and have made about three logging runs to start. If your STFT is not 1 then you will need to adjust. This is adjusted from the Fuel Scalar table (Fuel/Scalar/Fuel Scalar) - mainly adjusted for running ethanol or meth/PI injection. Disable COT and DFCO set Closed loop enable to max and dynamic airflow high rpm to zero flash and log and paste special multiply % until its close and then by half in MAF table? I've read several how-to's on tuning VE via STFT/LTFT, but I'm confused on the MAF tuning. I know my VE table is a little rough. Modification to the air flow usually equaled more air mass/density and therefore required more voltage. Do you still need to turn off the LTFT's while tuning the MAF if using this setup? Thanks Neal Need some help with MAF Tuning and data-logging using LTFT's/STFT's For all those that already know, or don't know yet, I have also posted this on Camaro5 sorry if this is a re-read for you. after 5 iterations everything is -2 to 0 with a few cells up at 1 and 2. co/vipy115🦵Kickstart your EFI Tuning knowledge. FYI after logging what I considered to be good data for my fist MAF change I got %errors as high as +12. The LTFT is basically already a record of consistent STFT corrections for a given cell. Up until tonight, everything was going as expected. comCheck out the latest tuni Mar 26, 2012 · Any help would be greatly appreciated. Jun 14, 2022 · 2011 Camaro 2SS Convertible L99 Bone Stock for now 2003 Dodge 2500 5. MAF_ClosedLoop. Show Printable Version; 06-17-2009 #1. 7. Use the gmve math as the parameter in the ve graph and stft as the parameter in your maf graph. Jun 12, 2010 · 11. Once second it commands the 13 afr im commanding in pe mode. 06-23-2024 #3. Mar 29, 2010 · Highlight the first cell of the MAF Calibration 2 table and paste the modified cells. I disabled the MAF, tuned the VE tables till they were within 1-3% on the STFT. with maf enabled it runs like crap. Jun 13, 2016 · This is meant to serve as a basic how-to for setting up a MAF fuel trim Graph (or graphs) in VCM Scanner V3. I have been using SCT's Pro Racer Package (SCT Advantage software) for almost 10 years but one of the biggest challenges I faced as a DIY tuner is that tuning the MAF was always a pain since I had to sift through lines of LTFT/STFT data. Oct 24, 2023 · I datalog and get the VE table dialed in to where it is between -5% and 0% on the fueling. Nov 7, 2019 · Tune the MAF table by logging MAF V and STFT and adjust the MAF V by the average STFT for each step. I am using the SD VE and MAF Tuning instructions rev2 and am also curious if I need to disable the LTFTs when tuning the MAF using a wideband? It doesn't specify this in the guide and the Histogram shown for tuning the MAF has the Fuel Trims included. Settings needed to tune MAF Engine, Fuel, Cutoff DFCO> Disable Enable RPM 1300>change to>8100 Disable RPM 1200>change to>8099 Engine, MAF STFT AVG FILTERED. Make sure you have MAF Hz listed to read in your PID list or it won't work. 2. Mar 25, 2007 · My knowledge of MAF tuning is limited, but I have done it once or twice. I have been reading some threads (incluiding yours, of course) on how to adjust those *Configs from the previos version to make them work in the new one, but my problem goes to the fact that I cannot find the Mass Apr 25, 2010 · Save this tune with the changes above as MAF-1 or something OTHER THAN your current tune. hd-customs. Where is the MAf hz histogram? Also, for step 2, what do you mean STFT and LTFT. For example if the STFT value is 4% lean, the commanded lambda value at WOT goes to . thanks Jan 2, 2023 · 3. my maf curve looks like a squiggly line from the last shop that tuned it. 86 lambda. com à® Fuel trims are a good place to start and get you into the feel of how things work in the PCM and commonly useful to touch things up. That didn't do anything for STFT. Create youself a MAF Freq. 2011 +plus vehicle you dont need to force open loop because their always run in closed loop because of the wideband O2 sensors. We can help you verify your numbers. I am tuning by maf only with STFT's, SD is disabled along with DFCO and LTFT's. WOT fuel and the upper end of the maf xfer function needs to be tuned via wideband. Needs to be maf tuned it's lean. i cant seem to download or find a good copy of the MAF!LTFT file. Car basics - '04 LS1, descreened MAF, ported 243 heads, Comp 227/230 . EX-T's and others use a Maf. Now flash (write calibration only) this tune (MAF-1) to your truck HP Tuners GM Gen V Training Part 40: Closed-Loop MAF Tuning walks you through the calibration process to dial in the MAF curve. 11. Repeat the process making a 2nd set of Histograms using LTFT alone vs Maf Freq and then STFT alone vs the Maf Corr Table. I run a scan, check Histogram #8 for MAF-STFT, note the cells that are above 0, copy the cells and special paste by half into MAF Calibration in the VCM Editor, run a compare against the stock scan and MAF tuning via LTFT/STFT? I was looking at the new maps included in 7. We are still going to filter anything below 10 cell counts and filter anything above 14. 22:09: So we'll see again how to select that parameter really shortly. Apr 30, 2016 · I think tuning a digital MAF transfer is not the same as tuning an analog MAF transfer. I try to keep the fueling a bit rich and let the 02 sensor trim back the fueling as it needs to. Less of a chance of screwing anything else up in the Does anyone have a document that goes step by step on how to do basic tuning without a wideband, or can someone help guide me along the way. It drives perfect cruising around. Here's an example 2001 Chevy Camaro 12202088 2G1FP22G412102986 MAF Tuning/VE Tuning Aug 20, 2012 · STFT's are best for tuning the low end of the MAF transfer function. What are you working on? Give us a background, a log of your scan, and a tune. 22:12 Dec 13, 2016 · I followed the thread on here with pictures. it really seems like I'm trying to hit a moving target. I mapped the STFT and it is rich everywhere. Use the Wideband to tune the part of the maf where you are in P/E. ) Nov 7, 2015 · Gen III - Speed Density VE Table and MAF - LS1 Tuning Guide. Next we need to use a different Graph to tune the MAF. I am confused obviously! Thanks Matt Mar 10, 2016 · Change the break points to whatever is in your tune MAF STFT. I've been using the LTFT+STFT method to improve the MAF period table. cfg for tuning a MAF? The one I had had a file name of "MAF Fuel Trims. Go get more data. 4 and 1000000/MAF HZ to find coordinates on MAF transfer and you will be fine. Currently running a FBO/flex-fuel set-up in my car and my STFT's/LTFT's are both hovering around the -9 to -11 range. Feb 21, 2009 · So after I am done tuning the VE I tune the MAF and set the Hight RPM Disable to 0 to disable the VE. 18v Mar 9, 2008 · The part where it describes tuning the MAF table can be simplified a bit by using a custom histogram in HPT instead of exporting the data to Excel. So the car is pretty happy fuel wise. Post a log and tune if Thread: Tuning MAF via STFT on 06 tbss. 60 pressure ratio); at 1400 RPM (same pressure ratio) the MAF airflow and dynamic airflow are near equal but the VE airflow is about 4 - 5% higher; in all case my lambda was 1. I looked over log and saw that the stft were screwing with my data. What am I doing wrong? I even went to the advanced tab and reset LTFT as well. Ask me how I know. What are you trying to do? BMW B58s are more torque based for tuning. 796 if the stft then richens up to -4% it commands . If you have custom histograms you'd like to post as well feel free. xml MAF AFR ERR. I have no idea what to change to lean it out a bit, I assume I need to change the MAF period in the cells where it is rich. Need to make sure the base fuel table and multipliers are set to the air/fuel ratio your shooting for. Update the Tune Properties information such as version and description and save the modified tune. Simplest way is to make a histogram using the table 'MAF Airflow vs. Hope this helps. 3. 0. Airaid, 2nd Gen Intake, Grid Heater Delete, D-Tech 62/65/12, Magnaflow. Eastern and Central Europe American Muscle and Harley-Davidson tuning www. 01 to plug in the MAF table to correct the MAF error? Down in chart v time, I did the ltft+stft there also and I get #'s like -5. And you tune in your fueling with the MAF and VE table. ive been reading it a and trying to wrap my simple mind around it. So basically, I need to know how to come up with the corrections based off ltft+stft #'s I'm getting to plug in the MAF tune. for the maf transfer i just split the difference betweet the stock tune and a jlt Apr 7, 2023 · Just took a look at this log in question though and I see MAF airflow, dynamic airflow and VE airflow all near equal at the 1200 RPM column (0. 1. *Unplug the Purge solenoid and flash the car!! *Warm up the car, drive it a lil until you reach operating temp, then start logging. Write the tune. Yes a higher value than you'll typically ever reach will disable LTFT's 2. Please open my eyes on this. Key terms are defined, such as STFT, LTFT, VE, MAP, MAF, SD, AFR, PE, and fuel trim cells. Idle tuning, SD tuning, MAF tuning, General If your post is missing anyone of those it will likely be deleted since I need that info to verify its a working configuration. /min. OL & CL – Open Loop – STFT Openloop – set to Disabled. i can never get it within 2-3% on MAF only, so im wondering even when ive dissabled Dynamic airflow, DFCO, and LTFT that something external still messes "maf only" up? Support Those Who Support The GarageFor more tuning content check out our partner Elite Tuned School:http://www. Anyone tune this? Apr 4, 2023 · killer thread BTW. I'm mainly concerned with part-throttle tuning as I rarely go WOT. You need both. Aug 17, 2014 · My question for MAF tuning is, How long should I log and under what conditions do I need to log? would I do the exact same for MAF as I did for VE? Also, how much different is my curve going to look from stock? LTFT and STFT are percentage corrections in fueling, so you can take the table data from the histogram and apply that as percentage difference to the MAF table in your tune. May 15, 2023 · Yeah I wouldn't even bother with the wideband until you get to wot tuning which could be a while until all your part throttle tuning is done. clean data in the table up. Step 7 – Flash the Modified MAF Table Using the Tunes tab in VersaTuner, flash the modified tune to the vehicle. Jul 8, 2011 · ** "EVAP SOLENOID" once done making mass adjustments and you want to finalize the maf, disconect the evap solenoid for best results. I don't know which way to change the numbers. LTFT+STFT is to be used mainly when a change has the transfer really far off. HTH STFT Bank 1; LTFT Bank 1 (Optional depending on tune config) STFT Bank 2; LTFT Bank 2 (Optional depending on tune config) Wideband Bank 1; Wideband Bank 2 (Optional) EQ Ratio Cmd; Engine Speed; Intake Manifold Absolute Pressure; Volumetric Efficiency; Manifold Air Temp; Head across to the spreadsheet and plug your IDs into the blue ID column. When I re-enabled the MAF the STFT goes to -20. I made my MAF vs. hpl a few posts above is a closed loop MAF log after rough MAF tuning. When using LTFT nothing needs to be disabled to avoid "chasing you own tail" during the MAF tuning process. 03-03-2022 #4. Worked very well, and went much quicker than it was taking using just LTFT. A dyno session later this fall will fine tune WOT AFR and other parameters. 21:59: So HP Tuners again have made this really easy for us. This time we are going to setup a MAF Graph that plots MAF Airflow vs. It's pretty much like VE tuning, just with different axes. Output frequency. Support Those Who Support The GarageFor more tuning content check out our partner Elite Tuned School:http://www. I feel like I take 1 step forward and 2 steps back. Oct 6, 2015 · You have to create a user defined PID for MAF Period. There is more than one way to adjust your MAF but the method you are using will get the job done. MAF only tune is disabling the VVE table to run on only the MAF sensor, which is usually done by changing when the MAF takes over in DYN air and what the maf High fail Freq is set to. 3l, Whipple 170mm tb, long tubes, and Id1300 Anyone have a good maf curve for stock gt500 maf in this 148mm maf housing? Car runs good on stock maf housing. cfg" Nov 19, 2004 · I started to tune my truck by the dirrections written in this section of the forum I left the ltft's on and copied the high octane table to the low and followed all dirrections and tuned till my #'s were with in 10% then I figured I would move on to the next method and shut off the ltft's and just tune with the stft's when I got some data after Jun 15, 2009 · Then tune the MAF by fuel trims, which is essentially the same as the VE method, but using the MAF Airflow Vs Output Frequency table, recording Short/Long Term Fuel Trim Bank 1 (SAE) Then just leave it like that. But during wot through first gear it leans out badly. JRide. If you are running your maf, you need to tune your maf, if your in speed density, you tune VE table. It shows MAF Calibration and also Main VE and positive and negative MAF allowed delta airflow. Didn't adjust any thing then the next day on start up it was super lean. But when I try to tune via stft +ltft and maf period to get correction factor. for MAF size changes and then to analyze logs to fine tune the MAF transfer function. Jan 1, 2008 · OK, EC Tune, I've used your config MAF!LTFT and the MAF -STFT Filt5 histogram yesterday and today. I put the o2 readiness voltage to a negative number and write the tune. I can't seem to get past step 7. Same info is needed. Includes a decent amount of idle at startup, followed by driving around, followed by a bit of idle at the end. Hey guys, I've been trying to dial in my MAF for quite some time now using the LTFT, and LTFT+STFT. Output Frequency', then plot the LTFT PID in that histogram. I set my MAF correction table to all 1's. You can disable LTFT's and only use STFT's for part throttle adjustments. Here's my quandary. There should be no KR, if you are lean than that may be contributing to your results. This document provides instructions for tuning a Gen III vehicle using HP Tuners software with a wideband O2 sensor. It would be a lot faster to disable LTFT and just use STFT. Dial your STFT in, then buy a wideband and start maf tuning the car. Under Dynamic Airflow, I see that my MAF High RPM Disable and High RPM Disable re-enable at both sat to 0, and the MAF codes (P0101, P0102, P0103) are all sat to fail at first error, but the MAF Frequency High and Low tables still have value in them (15,000 high and 1,1** low) does this mean my car is still using the MAF sensor alongside with Jan 30, 2017 · Tune the MAF curve first - setup the tune to run in MAF only mode, beginning at 400 RPMs. Multiply the MAF table by 1. 660 Valve Springs, GM Hollow Intake Valves, Melling 10355HV Oil Pump, IR EGM-205 Oil Pan Baffle, CAI Intake, Fast LSXR Intake Manifold, Nick Williams 103 TB, ZL1 Pump, TSP 1 7/8" Longtubes with the maf is slightly bigger. Alot of people dont and I tune them with closed loop and let the front O2's do the VE and MAF tuning, then do PE tuning on a wideband equipped dyno. Would this not work on the GM's? Next after the trims are done, make wot fuel adjustments with the maf instead of the PE table. While the best method to accurately adjust your VE table and/or MAF calibration is to use a wideband AFR meter, a technique many tuners rely on instead Jun 23, 2024 · On a SD tune the MAF is disabled and the LTFT are disabled? you can use ltft plus stft or you can only use stft but, yes, MAF is failed. Put DTCs back to stock, MAF High Frequ fail back to stock (13,500htz), High RPM Disable> set to 400RPM. What LS1Tech. Last edited by schpenxel; 07-28-2016 at 08:16 AM. I log what was said above, maf period and stft. I asked a question here earlier and it was pointed out to me that I'm MAF only and should tune my MAP. Re-Enable Dynamic Airflow. Repeatability is key to me. I have tried to search and I am a little nervous about posting on HPT, frankly I am a little intimidated by the majority of people on here. If you want to tune in the MAF, then you need to leave the MAF on and Check your MAF STFT Adjust graph that you made and make the adjustments to the MAF curve (just do a direct Multiply by %). 5" single exhaust. 22:07: Our long term plus short term fuel trim. 6l mustang, just a straight pipe and cold air right now but I read up on Eric Brooks article and have been researching on what the parameters mean and how i change them to make my car perform better although there is very little information on my car on Apr 5, 2023 · I have followed all the steps to disable STFT/LTFT, DFCO, and VE so that I could tune the MAF. OL & CL – Long Term Fuel Jun 22, 2012 · Hate to bring this out of archives. Once you are getting fuel trims in the <4% range(ish) or something youre happy with, then you can tune MAF. 9 Cummins QC 4x4. 2012 gt500, vmp 2. With the current VCM Suite there is a LTFT & STFT average selection for setting up the histogram. Blended mode is having the maf and ve working by having the dynamic airflow set at 4k enable and 3900 disable for example when under 4k the airflow model will use both maf and ve for fueling calculations and above it will use maf only like for wot fueling - if you just want maf only tune you would set dynamic airflow to 200 high rpm disable You say you want to "tune LTFT and STFT". If you tune in SD closed loop and get everything dialed (VE tuned etc. not the same power. Which my SI is. vs Fuel Trim histogram (LTFT) in HPT. 6. Normally, we shut off the ability of the ltft's, tune the stft then clear memory and turn ltft back on. Oct 15, 2015 · You need to log either ltft or stft for the sensor (Parameter), and use the MAF Period Sensor for the row, and populate the row values to match your MAF vs Period table. This will work on vehicles with one or two MAF tables. The document is intended for beginners but Mar 21, 2019 · I am going to attempt non-WOT VE table tuning tomorrow or this weekend. Then I apply the changes from my log into the tune, multiplying by percent. After driving, minimum 100+ hits, then paste special multiply %, I graph the new MAF settings in the tuner and it's ALL OVER THE PLACE. 6) 4. 6 ([SENS. I still see a lot of people using the old method of disabling the MAF to calibrate their VVE on 4th generation LS stuff, that generally being E38 controllers and up. the values i'm getting for the stft+ltft don't seem right though because when the maf is at the 4656 hz it's showing this on the chart that the hz on the stft+ltft histo it's at 2375 hz and that doesn't make sense to me cuz i would think that it would want to correct the hz area that the maf is at and not a value lower than what it is Aug 16, 2020 · STFT trend shows the average range of STFT in 30 minutes drive approximately between -1 and +1 according to scatter graph comparing MAF V. i have never tuned any thing before so sorry if this is a stupid question. Rinse and Repeat. I have the histogram gram using STFT+LTFT with maf freq So to tune in open loop. Sep 9, 2015 · Use STFT+LTFT if you log sae PIDS in 22. I really want to learn how to tune my car. elitetunedschool. 5) Take a longer cruise log (to fine tune the part throttle driving) and then start getting the RPMs up - watching your wideband to make sure you're not running too lean or too rich. 613/. Much quicker and more accurate than older methods with definite improvements in drivability. Enter HP Tuner's VCM Suite Mar 15, 2011 · MAF is the first place I started. i only changed the maf voltage and i used all the timing changes from the intake, exhaust tune in the tune repository. Also, under the Open Loop, the 'STFT open loop' is disabled. In all calibrations make sure the MAF flow DOES NOT exceed these values, (even lower at 1,000 kg/hr or 36#/min for some select v6 and 4 cyl strategies) although you can put a Someone gave me a . Make sure to log MAF g/s, MAF volts, LTFT, STFT, AFRs, and KR. Jul 7, 2011 · I just reviewed the no maf tune from the ve/maf tuning instructions LTFT is disabled. When i start logging STFT are still active and making adjustments to fuel. :banghead: Then I can't get any good data. On the MAF FREQ. 3 to 10% is the range, most cells are in the 5% range. It looks like a mountain range going up and down, then tapering off in the upper ranges that were left stock. Apr 5, 2023 · I have followed all the steps to disable STFT/LTFT, DFCO, and VE so that I could tune the MAF. Feb 24, 2016 · After that, I wanted to adjust the MAF table according to the config of MAF-STFT, and it did not work as I just installed the V 3. tuning MAF w/STFT OK I tried the tune the VE with LTFT, but had better luck turning of LTFT and using short terms to dial it in with. Oct 17, 2020 · With the distance between the MAF and the intake valve, the MAP sensor and the intake valve as well as the tuning effects of the manifold and cam phasing, in an airflow transition both the MAF and VVE are inaccurate. Oct 7, 2021 · Setup a maf and ve graph like you typically would copying over labels/axis from the editor. Its either higher or lower, I have noticed however that based on the amount of STFT value percentage, the base . If not using a MAF (Speed Density), tune the entire operating area of the table. Analog MAF sensors used 0-5v to control the temperature of a wire. Aug 15, 2014 · Filter this out and your steady state MAF values developed from your LTFT/STFT should be very close to any overlap developed from the WB in OL/WOT tuning sessions. Been working on a way to automate MAF tuning (Gen3 Coyote). E. wfrxy jigh vhvqf lex hna yerxibw ilyca yyl qhj pzgh