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Thread: E85 on Gasoline Scale

  1. #1

    Default E85 on Gasoline Scale

    I just wanted some clarification on tuning E85 on Gasoline scale. I have the car running and been doing some tuning on it. I also have some math setup to datalog torque and horsepower, thanks S2H & Danny for the Math Channel sticky (LINK). I've noticed it's showing way more torque than the engine is producing, so after some digging I noticed that the Fuel Flow and the Duty Cycle is way high. Does leaving it on the Gasoline scale affect how the ECU calculates Fuel Flow? Here's the setup single turbo, 6.0L Bosch 80 lb/hr injectors with a base fuel pressure of 43 psi.

  2. #2
    Join Date
    Dec 2009


    Is the "Actual System Pressure" parameter set to 43 psi in Engine Parameters? What's your horsepower Math Channel? (Initial Checks & Adjustments - Read Step #2)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3


    Yes, the Actual System Pressure is set to 43 lbs. I'll double check the Math Channel, but I believe I'm using [Fuel Flow]/.6. The real issue I believe is in the Fuel Flow. How does the ECU know what fuel it's using in order to get the Fuel Flow correct. I know it doesn't matter on the AFR due to it looking at Lambda, but doesn't the fuel type matter for fuel flow to be correct?

    Here's a copy of the datalog. I'll double check the base fuel pressure, but I believe that's OK. I'm just wondering how the ECU knows the difference from Gasoline & E85 on calculating the Fuel Flow.
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