LQ4 tuning...

Posted: Sun Apr 02, 2006 5:39 pm Post subject: LQ4 tuning...

When i put my LQ4 maf on along w/ my TB, should i drive nicely for 50 miles to let the PCM relearn everything or should i start tuning right away w/ my afc? (installed w/ battery unplugged for reset, also no powertuner for LQ4 MAF tables)
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2004 Yukon XL Trying to keep stock
2000 gtp Custom I/C, TOGs, Custom PCM, 3.25'', HAI, VS cam Retired

Posted: Sun Apr 02, 2006 7:11 pm Post subject:

Short answer, yes, let the computer learn for a little bit and then start making adjustments.

However, if you want to make some educated adjustments before hand, it might save you a reset/learn/tune cycle. By that I mean making slight adjustments blending higher MAF frequency settings into the lower frequency settings..since 0....11500Hz on your stock MAF is now scaled down to 0....{some number < 11500Hz}. So your current settings will be compressed/shifted toward 0Hz to work with the new MAF.

Oh yeah..disclaimer:
<---never used an AFC Wink

...so maybe it's easier to just run it for a while first...
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2018 Acadia
Retired: 2014 ATS, 2004 GTP

Posted: Sun Apr 02, 2006 10:05 pm Post subject:

should i revert the afc back to 100% or should i keep my current tune in there? (4-7@97 8@102 9-11@103)

Posted: Mon Apr 03, 2006 8:37 pm Post subject:

why are you running that maf? you don't need it , its stupid
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New Era performance

01z28, M6 NA, mullet, T tops, siqqqq

Posted: Mon Apr 03, 2006 9:23 pm Post subject:

Please, do elaborate, John.

Posted: Mon Apr 03, 2006 9:43 pm Post subject:

~ 9'' K&N CAI, TBS, NGK TR6, MSD 8.5mm, afc 2.0, 3.4'' pulley, u-bend/res delete, 180* t-stat ~
Coming soon: VS cam, 3'' D/p , and what used to be a zzp stage 1 tb Twisted Evil

Posted: Mon Apr 03, 2006 10:15 pm Post subject:

i opened up a stage 1 TB fully and sealed the stock MAF hole so now it's a straight through shot. This MAF is the same Diameter as the Fully opened TB so it's a perfect combination flow wise. The stock MAF sensor only reads what flows through it which remains the same size no matter how large the TB is, therefore making it inaccurate.

Posted: Mon Apr 03, 2006 11:07 pm Post subject:

the maf only reads the speed of the air as it whips by the sensor. Now yes, it's calibrated for a certain size opening..but you can open up the TB and scale the MAF (my not too much) to make it 'accurate' or you can fart around trying to scale the LQ4 MAF (which will be much more difficult) as well, and get hopefully similar results....

Either way you do it, you're not going to be close to maxing out a stock MAF...low 12 second blow thru setups is where stock maf maxes out...
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Hi, I'm Matt.

I'm the resident smartass and I have fourblack children: (ok, one's only half black..)
07.5 2500HD, Duramax, Edge Race Evo CTS, MBRP 5" Stainless, TransGo, Sleeves, EGR!, PCV
09 VRSCDX - Night Rod. Flat black, gloss black
02 Black Z06. All work done by New Era Perforamnce. 519/497 at the rear, 3100 lbs.
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07 Arctic Cat F8 Sno Pro - Smashed into 1000 orange pieces.

Posted: Mon Apr 03, 2006 11:31 pm Post subject:

Possible answers:
1) Here's my log showing me getting close to the peak of the stock MAF sensor (11500Hz).
2) It seemed like a good idea at the time.
3) Everyone else was doing it.
4) Scott Cook said I needed to.
5) I had money to burn.
6) I wanted to learn something.
7) A bag of walnuts.

Posted: Mon Apr 03, 2006 11:55 pm Post subject:

Hey, do what you want....

Just stating why it doesn't need to be done

Posted: Tue Apr 04, 2006 7:09 am Post subject:

DO NOT trust the stock computer to relearn properly for a different MAF. You will regret it. Tune the thing properly and you'll get better results all around.

Posted: Tue Apr 04, 2006 12:05 pm Post subject:

wanna sell it then? Embarassed

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ZZP stuff...
Heads (started as ZZP stg.3 with some improvements)
Cam (XPZ with a slightly different components for valve movment)
IC (Ford Cobra coolant resv., frt exchr the size of a engine rad. weight consum. rear expans. tank)
"Certified Auto Trans Shop" Transmission sold by ZZP...I have no comment for this peice of...great trans. Wink

Also,
SLP Headers <--FOR SALE
Eaton's Gen.3 M90

Posted: Tue Apr 04, 2006 3:32 pm Post subject:

Posted: Tue Apr 04, 2006 4:19 pm Post subject:

Posted: Tue Mar 11, 2008 10:49 am Post subject:

ok, you guys got me wondering... dmc is getting a northstar with LQ4 maf and wants me to load some tables for him. which is better, the table on zzp's site or this one on 3800pro???

http://www.3800pro.com/forum/pcms-tuning/3272-maf-table-repository.html
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97 gtp, 3.4 and supporting mods
71 gto 460 hp 383 stroker, muncie 4spd, 4 wheel disc brake conversion... work in progress

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