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Thread: E38 2012 ZL1 Fuel pressure transition rate question

  1. #1
    Senior Tuner Iam Broke's Avatar
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    E38 2012 ZL1 Fuel pressure transition rate question

    Does the value shown below in the fuel pressure transition rate tables represent kpa change per second? Trying to speed up pressure change going into high flow. Higher value = faster rate of change?

    This table is from a stock ZL1 tune, mine is a ZL1 pump with ADM FPCM setup. Just trying to understand as it's been a while... Thanks in advance.
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    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel

  2. #2
    Senior Tuner Iam Broke's Avatar
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    Well, no replies so hopefully this weekend I'll make some progress. Spent the last two nights getting v3.4 up and running to do logging with the scanner. Nothing like climbing that learning curve again at 60.
    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel

  3. #3
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    Well Default is 100kpa which should be an aggressive setting, so not having messed with this myself - I'm going to "assume" that a higher number is a quicker rate of change as well
    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

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  4. #4
    Senior Tuner Iam Broke's Avatar
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    The screencap was from a stock ZL1 file and it shows 20 for the high flow transition, I can log commanded pressure vs actual so we'll see how it ramps. Looking for it to ramp up with boost, logging that and inj delta. Time will tell. Too bad the FP duty cycle shows 0 not running or 99.6% when running no matter what the commanded pressure in the scanner tho. Was hoping to log the DC as well.
    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel

  5. #5
    Senior Tuner Iam Broke's Avatar
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    Made a few test hits today, seems that the stock values are fine. As the pressure commanded steps up the actual pressure responds within ~0.1 sec. Ima leave it.

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    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel