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Thread: What AFR in Boost?

  1. #1
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    Default What AFR in Boost?

    I just started logging boost, it looks like I am running in the low 10's AFR in boost is that normal? The car does kind of sputter a bit in boost. I JUST went SD using CO3 and I am starting to play with the boost VE table. Thanks

  2. #2
    EFILive Reseller kbracing96's Avatar
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    I like to shoot for around 11.5 in my truck. These motors don't like it to well if you get to lean in boost. Much over 12 and your risking denotation and broken pistons.
    01 ECSB 1/2 ton 4x4 Forged 5.7 LS1 GMC

    Custom KBracing front mounted, BW S480, intercooled turbo


  3. #3
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    I have been leaning it out 2% at a time, still in low 10's I think bottom of gauge reading will shoot for low 11's Thanks

  4. #4
    Member VYSSLS1's Avatar
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    what boost levels are u running, should be aiming for 11.6-11.9 AFR on boost

    just dont run to much timing........

    and u will want to change it more than 2% at a time, u will be there for a year.

    Also are u running power enrichment as well, or just straight of the VE Boost table.

  5. #5
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    I am running 10.2 - 10.5 . YES I am starting to notices takes ALOT of time @ 2 percent....LOL. I was just nervous about leaning it out and was not sure how much to jump at one time. I have not worked with the PE table yet, do you have any tips what to do in that area? I am running around 10* of timing in boost Main spark table is 13* with 3* retard on the boost table.

  6. #6
    EFILive Reseller kbracing96's Avatar
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    Are you using the scanner and logging the BEN factor? That will tell you how rich each cell is compared to what the commanded AFR is. Sound to me like you need to get used to the scanner and use the maps a little more

    Autotune works well on COS's and boosted motors if you start rich and lean them out.
    01 ECSB 1/2 ton 4x4 Forged 5.7 LS1 GMC

    Custom KBracing front mounted, BW S480, intercooled turbo


  7. #7
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    Quote Originally Posted by kbracing96
    Are you using the scanner and logging the BEN factor? That will tell you how rich each cell is compared to what the commanded AFR is. Sound to me like you need to get used to the scanner and use the maps a little more

    Autotune works well on COS's and boosted motors if you start rich and lean them out.
    I am logging BEN(2bar), AFR(2bar), and Knock retard what else would you feel that I need to set A/F and timing since I am after all still getting used to this?

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