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  1. #101
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    Hey guys, there's an e85 discussion going on elsewhere and then the issue of fuel trims maxed(near Max) was brought up and then joshboody brought this up(I know he doesn't have many fans here, but the guy is pretty sharp IMO)
    Click here to enlarge Originally Posted by Joshboody Click here to enlarge
    The DME will just recalculate fuel mass when changing pressure... shouldn't have any effect I assume. Piggies get more fuel by reducing the fuel pressure signal to the DME. This can also raise IDC when DME cannot reach pressure target. At this time there is no way to increase fuel mass with ATR (from what I've reviewed). Potentially reconfig a torque table to reduce load per torque and indirectly get more fuel? Good work OP. I guess to review these maps, I have to upload another ATR for this ROM? I have I8AOS
    Just wondering what you guys think. Is it possible to increase total fuel volume to take e85 into account as ATR exist now?
    Click here to enlarge
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  2. #102
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    For flash tuning on E85 ideally you'd need an rpm/load/lambda/IPW reference table. With a piggyback you can work around that by fudging the fuel pressure signal and/or fudging the load values.

    On the flash end I don't see any easy way to work around the fuel trims issue without having the proper tables at hand. But it might not be a big deal with say a 40% E85 mix. The DME is aware of actual load so it's going to be in the ballpark and you do have a +34% trim factor to work with. As a starting point I might take their S2+ aggressive map, bump advance up to the OEM levels, lean AFR out to the OEM levels, and then gingerly evaluate on a 40% E85 mix.
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  3. #103
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    That's exactly what you with ATR now, work under the 34% cap at a 40:60 mix of E85. Any more than 40% and I personally smash into the 34% ceiling. I keep hearing cobb is working on a way to tune for more fuel, it's only a matter of time before cobb supports 100% E85 tuning.

  4. #104
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    For flash tuning on E85 ideally you'd need an rpm/load/lambda/IPW reference table. With a piggyback you can work around that by fudging the fuel pressure signal and/or fudging the load values.

    On the flash end I don't see any easy way to work around the fuel trims issue without having the proper tables at hand. But it might not be a big deal with say a 40% E85 mix. The DME is aware of actual load so it's going to be in the ballpark and you do have a +34% trim factor to work with. As a starting point I might take their S2+ aggressive map, bump advance up to the OEM levels, lean AFR out to the OEM levels, and then gingerly evaluate on a 40% E85 mix.
    Thats basically what im currently running, on 25% ethanol. FWIW, i logged this on 15% ethanol and still had 0 timing drops.

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