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Thread: Wouldn't it be easier to tune with PE mode deleted/disabled?

  1. #1
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    Default Wouldn't it be easier to tune with PE mode deleted/disabled?

    Since I don't have EFI Live in my posession and can't seem to get a stock L31 tune, I'm left studying the LS1 tune provided with the demo. Why is there a PE mode in the first place? Why not just put in the desired value in the "Commanded Fuel when in open loop (normal)"? The only way to have 100kPa at 5,000 RPM's is to be at WOT anyway, why have 2 tables to come to this conclusion?

  2. #2
    Lifetime Member mr.prick's Avatar
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    Do you want to command 14.63AFR @ 5000RPM and 20kPa MAP?
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

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    Aww, my stupid ass missed the fact that that table is ECT vs. MAP and not RPM vs. MAP.

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    Lifetime Member mr.prick's Avatar
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    Give yourself a credit for catching my retort.
    There's always the COS option. {B3647}
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

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    Well it's not that I've never tuned before, I've just never tuned anything this complicated. I've tuned an SAFC, SDS, and tweaked on an Apexi Power FC which is all child's play compared to this.

  6. #6
    Joe (Moderator) joecar's Avatar
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    Even with a COS, consider this:

    B3616 PE Enable is based on TP...

    B3647 AFR is based on MAP...

    MAP lags behind TP (you snap TP open, MAP then follows after some very short delay).

    B3618 provides that initial "pump" shot.

    For tuning, I set B3618 flat across at say EQ 1.17, and the last 3 columns of B3647 to the same value.

  7. #7
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    I'm also wondering where's the intermediate pump shot? All there is is a no delay PE mode that dumps only when you give it 90%? There has to be a pump shot below that or the thing would stumble badly off the line. I also can't find the PE timing adder. Or is that the fuel mixture spark correction table? My feeble brain can't comprehend another use for it.

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