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Thread: Base fuel map adjustments

  1. 03-20-2022 #1
    lumberjackzac
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    Base fuel map adjustments

    I have Mk7 GTI with a Walbro 450 and want to account for that.

    I'm looking at adjusting my base fueling from LTFT +- STFT. I've taken several logs and it looks like ECM 29210 Base Lambda Target Bank is what I want to play with? Or am I completely in the wrong area? These cars...

    What's the easiest way to do this? seems very time-consuming to take the difference of the fuel tables in a spreadsheet and then adjust each cell for lambda.

    Forum isn't letting me post pictures but ok for example. 1600 Rpm and 480 mg cylinder mass, if I need to adjust by -6% then I have to multiply that cell by .94 or adjust by 2% multiply by 1.02
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  2. 03-21-2022 #2
    TylerJDubbs
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    Quote Originally Posted by lumberjackzac View Post
    I have Mk7 GTI with a Walbro 450 and want to account for that.

    I'm looking at adjusting my base fueling from LTFT +- STFT. I've taken several logs and it looks like ECM 29210 Base Lambda Target Bank is what I want to play with? Or am I completely in the wrong area? These cars...

    What's the easiest way to do this? seems very time-consuming to take the difference of the fuel tables in a spreadsheet and then adjust each cell for lambda.

    Forum isn't letting me post pictures but ok for example. 1600 Rpm and 480 mg cylinder mass, if I need to adjust by -6% then I have to multiply that cell by .94 or adjust by 2% multiply by 1.02
    Upgraded LPFP shouldn’t effect fuel calculations as it’s a direct injected engine and fueling is calculated based off HPFP pressure to injection time scaling through the VE model
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  3. 03-21-2022 #3
    aaronc7
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    The only thing you really need adjust for upgraded LPFP is pump speed vs fuel demand/pressure tables. Possibly limit max duty if you're still on the stock fuel pump controller.

    If you have a lowside fuel pressure sensor, you can easily low desired vs actual pressure and use that to build out a histogram to apply a correction to the fuel pump speed maps. Or a blanket correction factor across the whole table might get it close enough.
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  4. 03-21-2022 #4
    lumberjackzac
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    Whats the cap for stock controller on walbro 450? I thought it was like 85-88%
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