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Thread: LTG E85 PE table

  1. #21
    Tuner in Training
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    Mar 2015
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    I guess where i'm confused on is that is a .25 difference from gas to alcohol PE, with being 68-70% ethanol i would have thought the commanded pe eq ratio would have been around 1.17-1.175 and not the 1.195 it commanded. I would assume PE alcohol would be factored off of 100% ethanol. It took 78% of the 1.25 to command 1.195, where as i thought it would have used the ethanol sensor at 68% and commanded 1.175. Maybe i am over thinking this, but i wanted to figure out exactly how it worked between gas and alcohol pe tables.

  2. #22
    Senior Tuner cobaltssoverbooster's Avatar
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    Pe is pe there is no blend ratio therefor the gas pe and alcohol pe have a hard coded crossover point determined by composition sensor. The blending comes from the stoich table vs composition blend.

  3. #23
    Tuner in Training
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    Mar 2015
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    I think i'm throwing in the towel on E85, i just can not get a/f or fuel trims stable. Getting random spikes, it goes from way lean off the chart, add 10% to maf calibration and its rich off the chart. I have countless hours in this car tuning and trying to learn the way it operates and in 15 years of tuning efi, i have to say this is by far the worst i have ever dealt with, most hours with least amount of results. It is just very complicated and i'm about to the point i'm sick of wasting time on it. I had it close on gas but trying e85 again ruined me. I appreciate all your help overbooster.

  4. #24
    Senior Tuner cobaltssoverbooster's Avatar
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    Anytime. if you try again I'd like to hear about it some more.

  5. #25
    Hello, brother, I want to ask you:
    1: Whether the original ATS injector can meet the injection volume of E85(map 280kp maf 340g/s)
    2: What should the AFR be set to under high load conditions?

    thanks

  6. #26

    About E85 AFR map 280kp maf 340g/s

    Hello, brother, I want to ask you:
    1: Whether the original ATS injector can meet the injection volume of E85(map 280kp maf 340g/s)
    2: What should the AFR be set to under high load conditions?

    thanks

  7. #27
    How is the tuning effect of the E85 now?

  8. #28
    Tuner in Training
    Join Date
    Jun 2015
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    11
    I'm running full E85 currently on complete stock fuel system. FBO, 23 psi 33 LB/hr MAF Flow running 12.8 AFR to redline, no issues. I did bump up the fuel pressure at upper RPM's in the tune.

  9. #29
    Quote Originally Posted by ATrim View Post
    I have flex sensor active and set to sensor, but just checked and the dtc are set to no report. I attached the file as this is not a stock file. I have no cat on the car currently so I think I disabled most of that. I have been tinkering for awhile with this and did some ve tuning but ended up going back to a stock vve table. I will enable all the flex sensor dtc I can find and try that.
    Can't open attached file