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Thread: Fighting the STFT... Please look over.

  1. 06-04-2016 #1
    Chrome_Rust
    Chrome_Rust is offline
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    Fighting the STFT... Please look over.

    Been fighting getting my trims in line.
    Specs
    2003 truck OS blue/green PCM
    gen4 6.0 (24x wheel)
    0821 heads (ls3)
    LS9 cam
    BTR .660 springs
    LS3 intake
    87mm Truck TB (with xlink)
    Truck MAF
    pulling air from under rad, 4" aluminum tube getting hit by heat from fan. normally 100 degree intake temps
    stock ls3 42lb injectors
    vette reg/filter
    2000 Mustang GT pump/tank at 14.4v (normally PMW, 260ish LPS)
    stock 4.2 trailblazer TC
    4l65e trans
    8.8 w/3.55

    in 78 Fairmont....


    using 2.24, MAF failed, PE enable @ 150kpa, LTFT enable at 284 degrees.

    Following directions on http://gmtune.ru/pcm-tuning-process-flow#

    Any help is appreciated!!
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  2. 06-04-2016 #2
    GHuggins
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    If you haven't yet, make a custom math channel (stft bank 1 + stft bank 2)/2 This will get you very close real quick...

    Also just quickly glancing at the tune - looks like your trying to tune VE only your not failing the MAF completely? You'll want to look into that as well. Go back to pretty close OE VE and go from there... Keep the table smooth... Also not a big fan of keeping in closed loop - can cook things in a hurry if not paying close attention.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC
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  3. 06-04-2016 #3
    Chrome_Rust
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    I have maf frequency set to 0 hz from 13500.
    i am not opposed to running in SD mode only, but i daily this thing and figured MAF was worth having.

    thanks for the reply also. going to go work on the math channel.
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  4. 06-04-2016 #4
    GHuggins
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    You have to set the dtc's to first error too... I forgot the "exact name" of it, but you can log something called MAF state - should say normal if in speed density...
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC
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  5. 06-04-2016 #5
    Chrome_Rust
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    i have them set to fail on second. I will go change that
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  6. 06-04-2016 #6
    Hib Halverson
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    If you want to disable all fuel trim and MAF to calibrate your VE table with a wideband do the following
    1) Engine Diag:Airflow:MAF fail high to 0
    2) Engine Diag: DTCs: P101, P102, P103 to first error (this gives you a way to know that for sure the MAF is inop ie: when the MIL comes on you know the MAF is off.
    3) Engine:Fuel:Open&Closed Loop:ECT vs IAT: set all cells to 284
    4) Paste the high octane spark data into the low oct. spark table because, when the MIL goes on, the system uses the low octane spark table.

    This leaves PE intact. If you don't like that idea and for sure you are not tuning the VE at high-part throttle or WOT then...

    5) Engine:Fuel:PowerEnrich:PE Throttle/Pedal:Cold: all cells at 100
    Last edited by Hib Halverson; 06-04-2016 at 05:03 PM.
    Hib Halverson
    Just Another Tuner in Training.
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