GM Gen 3 MAF Tuning Intro, The Basics For Mass Air Flow

[@mcbridemotorsports5788]

Could you do one on how to properly smooth/interpolate the VE Table? Great vid man, emptying them all

[@theperceptionengine]

Interesting point about disabling STFT. I was out doing MAF tuning pulls and making adjustments and found I was always lean. It seems like the PCM was countering my attempts to richen the table. I'll have to try again tomorrow with STFT disabled. I bought the histograms even thought they aren't that hard to set up once you do it a couple times. Thanks for the videos.

[@theperceptionengine]

Follow up for those performing MAF tuning: Before this video came out I was trying to tune the MAF table by disabling everything described in the old Gen3 MAF tuning video. I was still lean after 12 iterations and by then the engine didn't run well. Today, with all the same things disabled PLUS STFT disabled as described in this video, I got a near perfect MAF table in 4 iterations. I have a P59 with flex fuel PCM.

[@mickeywells8698]

Thanks for all the videos. I have a question though. When I’m data logging there is parts of my log that shows rich when im looking at my wide band and it shows lean. What could cause this?

[@jacklegrand1014]

Great video! Can’t thank you enough for all the content you’ve put out! Would you happen to know why my graphs aren’t collecting data while logging? I’ve set up my graphs/histogram in accordance to your gen 3 videos. But can’t seem to collect any data to be able to “tune”

[@jackkinney1835]

Ever figure this issue out?

[@waynesspeedshop8167]

Bring your cell hits down to 2 or 4 or 5

[@ryanalder9691]

An easy way to figure PE EQ ratio: Stoich Lambda divided by desired Lambda. 1÷.85 is 1.176 Stoich Gasoline AFR divided by desired AFR. 14.7÷12.7 is 1.176. You can also calculate AFR/Lambda by dividing Stoich by the EQ ratio.

[@ryanalder9691]

Sorry, it is 12.5, not 12.7 as I had stated in original comment.

[@YoJoe-s4b]

I’m trying really hard to follow along but I had an edible. Had to save this play list. 😂

[@Americaparts]

Im tuning a small 5.3L with a big cam, I never took so many time to tune a car! can you help me out with tips? its so sensitive the reads lean when its rich if I pass the point

[@K.Peterson]

I've watched all your GEN3 videos and bought your Graph setup. I have an LS1, stock harness and ecm, long tube headers with no rear o2 sensors. I can't get my MAF to show up in these graphs. I see it on the channel list but it won't log in the graphs.

[@EL-bq8ir]

Thank you very much for your videos. I watch as many as I possibly can that are gen 3 related. Todays video could not have been on a better subject for me. It just so happens that this is exactly what I was working on with my HP tuner and my Silverado. You helped me big time today, and for that I say thank you! You have awesome information, very helpful. I don't know how you have the patience and the good attitude to do what you do? Thanks again

[@mobiledetaildoctor8154]

Great video. I am a mechanical engineer and remember studying this in school. I just bought a HPtuner obd port. Are there other vids I need to be watching? Thanks Mark

[@GoatRopeGarage]

www.tuning101.com I've got hundreds

[@adamthatguy454]

How long should you drive around to get a good set of data collected? I figure the route you drive should provide as much varied terrain/profile (flats, hills, accel, decel) as possible, but is there a minimum time?

[@chevyalltheway95]

Can you do a little tutorial about desensitizing knock sensors for spark tuning with cam and headers?

[@GoatRopeGarage]

Sure thing, keep your eyes peeled, will get one out soon.

[@antwain7942]

@@GoatRopeGarage Have you made this video already?

[@highboostedcivic]

Great details bro.

[@danieltompkins2960]

Good platform! Looking for a WOT GenIII TUNE

[@stevevanhook1413]

Great video Kyle, one thing I notice in this video vs the earlier gen Maf tuning video is you disabled stft will this make a big difference when tuning Maf?

[@GoatRopeGarage]

Yeah, they should be disabled when you fault the narrowband coolant settings but it never hurts to do the extra step here

[@rockroll9513]

@@GoatRopeGarage I think he is referring to your prior video on gen 3 MAF tuning. You did not disable stft?

[@orabates1823]

In my tune file under engine, fuel tab, oxygen sensors I don't have an LTFT enable or disable button. Under long-term fuel trim, I only have a Min ECT of 131⁰ and a Max ECT of 284⁰ what should these be set at if I don't have the ltft enable or disable button.

[@orabates1823]

What's the advantages of going to the LS7 MAF over the stock one in the Gen 3. The motor that's going in the truck is a Summit Racing 450hp 5.3. The intake is a Fast LSXRT with the Nick Williams 103mm throttle body. The air cleaner is one of the Volant air systems.

[@mdoe8]

The ls3/7 MAF is a card style and can be slid into any intake system. With this, you can use larger piping, which allows more airflow for a given measurement. Aka the MAF is able to “support” more power without being maxed out. You likely won’t see much benefit doing this with your setup.

[@danmccabe7435]

Thanks for sharing the knowledge !! I have a quick question. I've downloaded the channels and layout from your website. When I press the record button half of the channels go away and it doesn't log MAF frequency. Any tips on what I'm missing?

[@Sparky_budz]

Thank you for all these videos you put out. You have taught me so much and wish I would have found you awhile ago when I was starting out. Keep it up Kyle!

[@iskuts]

So I'm new to tuning. Built the engine myself it is my first one. Anyways I'm trying to tune it with the help of your videos. I have a sloppy stage two cam and a set of headers for it. The issue I'm running into is when I press the throttle it drops all the timing and gets to stall out. I saved the log if you want to take a look at it. Or do you habe an idea of what I might be doing wrong.

[@breakitjake579]

I've watched through this video quite a few times, and have everything set up like it should be. I've taken quite a few data logs and then made adjustments the way that you suggest, using the multiply by %1/2 function, but I can't seem to get it to improve. Currently, my truck shows that it's very lean, and no matter what I change, or how many times I redo that process, it doesn't seem to improve. If you have any thoughts on it, help would be much appreciated. I'm using an Innovate LC2, a Bosch wideband, and HPTuners (obviously lol).

[@mrjv64]

great video, when i am logging afr error i get values of -90%. I saw in an other video that you chanche som for that error values but i can't find it anymore. I hope you can help me.

[@darrinfown782]

Got a 2009 Pontiac G8 GT with full length headers, no convertors AFM delete kit from btr cam stage 2. Just bought a New HP mpvi3. I pulled the factory tune. But after installed. All the parts, the G8 won't hardly run when it warms up.. I was going to buy my tokens, and turn off the DOD first. Anyways. My issue is I need to get this running some what driveable fast time line. My house burnt down and took out my two other daily drivers, but thank God my g8 was saved. I have been watching your videos and learning. I just want to make a couple minor changes to get this thing running somewhat better to try to work on the tuning. What do you think. Will the DOD delete switching off help in the warm issues. Then work on tuning. I don't want to destroy the car. I want it right. Also since I bought this tuner. I have to now pay a registration and tokens? And 12 tokens for unlimited for a year. Is this correct from HP?

[@Toys4Life]

I was doing a MAF tune today and as an extra step, I zeroed out all the cells in the VE table (2003 Corvette PCM). Engine died driving down the road after 2.5 minutes or so. Wouldn't re-start. Put in the same tune with re-populated VE table and I have completed 3 more scanning MAF tune sessions with no issues. I would think if it wasn't using the VE table and was in MAF only mode, it shouldn't have died.... Thoughts?

[@GoatRopeGarage]

It's still using it, you can never get rid of the ve table, that's why it's important that is tuned also. Watch the recent video I did on dynamic airflow, it will explain it better

[@Toys4Life]

@@GoatRopeGarage will do, thanks for the response, love the channel! I always do the ve first as that seems to be the prevailing wisdom. Thought I would try something new as a test to see for sure if it's using the VE table or not well you are in supposedly only maf mode. It failed...lol

[@HeavyChevyDee]

Hello. How can I correct the lean condition when I crack up my car, and let it run it run lean.

[@nestorgarcia4590]

Is this safe to do with only a cam swap and tbss intake? 2003 lm7 5.3.

[@That_ac_dude]

All my readings are typically in the 50+kpa range. How do I get them lower like yours here? 4.8 212/218 113+2 lsa

[@MrBIG4D]

Great video. I have a question. I'm tuning a rock crawling Jeep. 5.3 gen 3, "mild" cam. Was fighting idle issues and found my intake air temp climbing above 200 deg. and a significant amount of timing was being pulled as a result. Installed an intake tube to pull air from under dash and it's much better. Now trying to re-tune the MAF. I don't have access to a dyno. Can these pulls be done without a dyno? If so how do you suggest logging without one? Thanks.

[@lindseydavis84]

I was trying to follow your MAF tuning but why do I not have all the things your making changes to?

[@GoatRopeGarage]

What are you tuning?

[@SamAceRothstein]

How relevant would this info be for Gen 4 engines? I have an LY5, would I basically follow the same steps for setting up before logging?

[@jacobgarci1023]

What if I don’t got a ltft disable button

[@loganolsen8415]

I have a stock Silverado. The MAF sensor does not log, any idea why?

[@1967c10Guy]

After buying all i need to tune i am so nervous for my first startup only tunned out vats so far but now i have changed camshaft, heads, intake and exhaust so i am afraid of it not running well enough to break in motor.

[@1967c10Guy]

Gen 3, 2002, 5.3, dbc, stage 3 summit cam, 799 heads, mid length headers, Holley ram intake, th350

[@insanereindeer4081]

@@1967c10Guy Just don't rev it out and take it slow. It's pretty hard to hurt a motor just idling and driving around normally.

[@antwain7942]

I have a 220 cammed 6.0 and when I first start it up the throttle response is supper faster and crisper than after it's warmed up. Is that because it's in speed density mode while it's cold? If so I guess a speed density tune (no maf) would be the key right?

[@Gonzalo6O]

Did you get your issue resolved? If so, can you tell me how resolved it? Thanks

[@damiangillen3365]

I know this is an old video but how much boost can the maf sensor handle?

[@GoatRopeGarage]

No easy way to tell, on the gen 3 it has a hard limit but there are many factors in airflow.

[@derekczeschin5623]

Would I tune the maf on hp tuner the same way?

[@cnewby4767]

Thank you for the videos. When I select the AEM wideband serial output in HP tuners it shows it as EQ Ratio, but the gauge itself is displaying lambda. Does HP Tuners convert lambda from the gauge to eq ratio automatically? Otherwise, I need to do some math to convert lambda from the gauge to agree with eq ratio in the gen iii pcm. Correct?

[@GoatRopeGarage]

They are the same

[@92frchld]

im confused as to how you can tell that its rich or lean on the maf eq err table. arent negative numbers rich? or is it rich + or - if its over 1. or are those numbers even related to lambda the value. switching from afr to lambda has confused the heck out of me. everything else is coming easy as i work with it and watch your videos. its like changing jets/power valves and turning the distributor and changing springs/weights with the keyboard. so awesome, becoming more addicted with every tweak.

[@92frchld]

basically i dont understand what the +/- number in the chart is. its been a long day though and ill probably get it after i get some sleep and take another look. i appreciate the content and time you take to explain this stuff to the world. cant wait to have this stuff mastered!

[@williamanderson4706]

I see it as part of the process going from the scanner to editor to special paste multiply by half what is that doing? I am just beginning and trying to pick up all that I can I have read up on it some and it says to do it but I was just trying to understand what that does. Thanks

[@GoatRopeGarage]

The graph logs error percentages, we are correcting that error, the half multiply makes sure we don't overshot

[@williamanderson4706]

@@GoatRopeGarage makes complete sense thank you. Your videos are awesome I just keep watching them over and over until all of the pieces make sense thank you for taking the time I appreciate it.

[@GoatRopeGarage]

That's the best way, keep digesting the information, see how it works on your setup and make incremental changes!

[@williamanderson4706]

@@GoatRopeGarage Great advice definitely what I'm doing I have spent almost six months trying to find a tuner I built a Whipple charged gen-6 454 in a 98 K 2500. Couldn't find anybody to tune it so got a hold of a guy they gave me a spreadsheet for the 0411 swap. It came with a base tune that pretty much got it to start so I can get fluids topped off and get it loaded on a trailer. I finally found a guy that was willing to tune it I'm not really connected to all this social media accounts and I paid $750 to get the truck tuned because I wanted it right and it won't even stay running at idle. I wanted to learn it anyways but I just bought hptuners and I'm spending all kinds of time learning why things work the way they work and how you tune a little bit at a time make sure everything works and that it's accurate. That way I understand why I'm doing what I'm doing as well as using my knowledge on how the motor works and what needs adjusting. I watched your video on how to select a tuner and anybody else that is going to get their vehicle tuned watch that video it will save you a ton of time and money and frustration. This information is priceless and this is where performance is going and it's not slowing down you have to be part of a community that helps us all grow and I am grateful for that.

[@MapesTom]

What if my open loop/base tab doesn't have STFT? It only has the EQ ratio table. I have it in my scanner/logs, but don't know how to trace back where it would be in the editor. It's a 97 ls1

[@GoatRopeGarage]

Just look for a way to fail the oxygen sensors

[@MapesTom]

@@GoatRopeGarage I only have closed loop enable, and LTFT settings. Nothing says it's for o2 sensors in general/overall. Does disabling closed loop (ect vs iat table) automatically disable long and short term trims?

[@CavFire98]

This is great content, if I have a ecm p04 am I looking in the wrong video/ gen3 / gen4? Also I’m trying to tune a 98 v6SC..... a lot has helped me with videos. It’s a bit confusing as I think I maybe missing things. Or things maybe different... for instance my Kpa on my ecm graph goes to 105... but I’m scanning or reading 170kpa. How can I add that to the ecm tables? Also I would like to scale my maf. I’ve dropped pulleys but would like to know what’s actually coming in. I’m about to buy your graphs! But I know on these older models things are dif! Such as speed Density. Etc etc. pretty sure my fuel trims are all over the place. Although I’m seeing around 11.8 to 12.7 afr at wot. At light load 40% under throttle I’m seeing somewhere in the ball park of 17. Basically leaning way out!

[@CavFire98]

Same goes for cylinder air mass.. pretty sure it’s maxing out on the ecm table at 0.92 and I’ve seen it in the realm of 1.02 1.05

[@boosted0079]

I was wondering if you've figured out anything on how to disable deceleration fuel cut-off? Or disabling ve at all when doing MAF tuning. I know the PCMs for the GM 3800s do not have any parameters in the editor to do these things like Kyle shows on these Gen 3 and up LS ECMs. Thanks

[@CavFire98]

The dcfo, is something I've messed with, it's all about enable and disable ref counts, I wasn't able to actually disable it.... I finally got an afr gauge aem x 30-330. And I haven't ran into any problems maf tuning, but it's a very long process, I was around 7200 hrz when I had to add more then 40%, then found out that dropping to a 3.4 on gen v SC, on a series 2 the injectors just couldn't keep up, I was at injector duty cycle of 142% and still leaning out up top, I upgraded to 42.5 injectors, and that took just as along to retune everything.

[@boosted0079]

@@CavFire98 I have a top swapped L36 with a ported Gen 3 blower. VS cam, ported heads and a 3.5 pulley. I also have that same wideband as you got. I've been able to so far get me MAF close, but it doesn't want to idle after coming back to a stop. I have to feather the throttle for a few seconds before it'll idle on its own. But even with cell count hits set at 7, deceleration is still skewing some of the data. I've just located and smoothed out those areas best I can. My injectors are keeping up fine though. I'm kissing just over 10,000hz on the MAF to lol. Probably because I'm on the stock L36 throttle body and MAF.

[@CavFire98]

@@boosted0079 I'm actually getting ready to swap everything from my 98 gtp coupe to an 01 gt coupe, so top swapping shall be fun, my 98 is just to far gone underneath. I'm hitting right around 13 psi, shifting at 6k. I really wanna try a" vs" and 90lbs springs and leave it at that, I got basic bolt ons, slp headers full 3inch 42.5 injectors, it has the l67 lower manifold ported and matched to the gen v, l67 throttle npt for the pcv, I'm hitting close to 10,650 hrz

[@danczuba]

I bought your graph layout from the website but I can't seem to get the MAF Error EQ to populate when recording with the scanner. how do you fix the math errors in the graph?

[@GoatRopeGarage]

Are you using a wideband?

[@danczuba]

@@GoatRopeGarage yes, AEM. I set it up in HP Scanner

[@GoatRopeGarage]

Are you logging mass air flow, the one that reads in Hz

[@danczuba]

@@GoatRopeGarage I have the graph set up to log the mass air flow in hertz. When I record it is not populating the columns. There is only one row. I copied the parameters from the editor. Starts at 1500, 1625, 1750, etc

[@danczuba]

Is there an email address that we could maybe communicate more efficiently with?

[@dtsgarage7169]

Hey i bought your scanner layouts,graphs, and channels and a AEM 30-0334 and I can’t get my Wideband to display or its not found I am using a MPVI3 on a P01 PCM. I don’t know what I’m doing wrong?

[@JoshuaMcInturff]

I'm thinking of putting a "411" pcm in a 1997 K1500. Just wondering if someone can confirm that this would be a gen 3?

[@Supercharged111]

A low res crank gen 3, yes. Start with a van 350 tune.

[@insanereindeer4081]

Yes. I am currently working on one but I have a HT383. Main reason I did a 411 swap was because I already owned HPT and the black box is garbage.

[@TylerGering]

I cannot get my afr error to populate

[@GoatRopeGarage]

What wideband?

[@TylerGering]

Aem x uego

[@TylerGering]

I am just confused. Should I be tuning in afr or lambda? I am only using 87-93 octane. Non e85. Gen 3 ls s10

[@TylerGering]

I’ve seen most of your videos and I am tuning in Lamda will it hurt to stay in lamda?