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Thread: E38 slow to go into PE

  1. #1

    E38 slow to go into PE

    07 vette LS2 E38 ecm, Supercharged on SD tune. Seems like quite a delay before Pe starts adding fuel. I have 2 logs one shows a lean area in the middle and one doesn't both were done back to back with no changes. Why does one show lean and one not? I can't figure out what to do to fix it. I can't find a desoot mode to turn off in the tune. I had the PE EQ ratio at 11.5 but richened it up to 11 due to none of my pulls under boost being consistent. Sometimes I have KR and sometimes I don't these two pulls are with 1/2 can of boostane. What do I need to do to get a handle on this PE?
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  2. #2
    Senior Tuner 10_SS's Avatar
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    I found two PE runs on one log, and one in the other. All go into PE instantly, and the 02 and PLX data agree. Maybe take a screen shot exactly at what point your talking about?

    I have switched my PE entry method using TPS instead of MAP, I made MAP low like 15kpa entry, then used PE TPS since the pedal is the first signal that you want PE rather than wait for the MAP data to enable PE, but I dont really see much of a delay in your setup.
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  3. #3
    I'm looking at my chart vs time when starting to get into boost the commanded is 0.751 but the actual is 0.962. Then in the middle of that pull it goes lean again.
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  4. #4
    Tuner 5ft24's Avatar
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    Looks like you are only at 61.7% throttle... is the TB opening all the way, TPS issue?
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  5. #5
    It's not full open in that screen shot. I posted the picture to show commanded vs actual on pe fueling. The log I posted shows the full pull.