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Thread: Fuel Flow in LB/HR around idle.

  1. #1

    Default Fuel Flow in LB/HR around idle.

    I'm curious after messing around with my Base Fuel/Timing Tables to gain more resolution on those tables. I got to thinking is there a formula for figuring out the amount of fuel in lb/hr needed for a vehicle to idle? I Googled some stuff and came up with this, correct me if I'm wrong:
    Per Liter of displacement = approx .08 - .1 Gallons per hour = .49 lbs/hr - .62 lbs/hr
    So mine being a 438ci = 7.178 Liters = 1.896227 Gallons = 11.7 lbs/hr

    I'm horrible with math, so I could be completely wrong, but if there's a better formula or you could point me in the right direction that would be much appreciated. Just curious as to how you determine the lowest value of fuel lbs/hr that can be entered on the table. Not looking for an exact answer just some input.

  2. #2
    Join Date
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    My big block Ford idled around 9.5 lb/hr. My small block Ford idles around 4.5 lb/hr. Lots of variables.
    http://forums.holley.com/showthread....ng-Temperature (Learn/Self-Tuning After Initial Startup)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  3. #3

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    Thanks Danny, just getting a better understanding for some of these details. I'm close to getting my turd on a dyno. LOL.

  4. #4

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    I like to add resolution in the idle area and get it so IPW is fairly stable. Usually that works. I honestly don't pay much attention to Fuel Flow, just slap 45% VE in the idle area and go from there.

  5. #5
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    Some engines inherently idle better than others (compression ratio, camshaft specs, RPM signal from crank trigger or distributor, etc.). Some engines will idle worse with more resolution in the idle area because it just allows more room for the live cursor to move around. Experiment with the three idle columns spread out with 100, 150 & 200 RPM increments.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

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