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Thread: Stumble Between 3000-4000 RPM

  1. #1

    Default Stumble Between 3000-4000 RPM

    I just started tuning my car and I have a nasty stumble between 3000-4000 RPM, when transitioning to WOT. Once it gets past that window, it runs like a striped ape. You can also feel it while in park if you zing the throttle. I have tried several things, and I don't feel it's getting any better. This is on an LT1 that's a race only car with a WBO2. If someone can look at my program & datalog and point me in the correct direction, I would really appreciate it. I'm at my wits end with this thing and really need assistance. A little about the engine: Stock lift cam with lots of duration, stock intake, stock TB, 30 lb injectors, Opti distributor only & crank trigger pickup.
    Last edited by Buckeye; 05-13-2016 at 02:10 PM.

  2. #2
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    Quote Originally Posted by Buckeye View Post
    I just started tuning my car and I have a nasty stumble between 3000-4000 RPM, when transitioning to WOT.
    Does it stumble because it's too lean or too rich? What's the ignition timing? Have you reviewed a datalog of this occurrence?

    This is on an LT1 that's a race only car with a WBO2.
    Is the WBO2 sensor Closed Loop integrated into the C950 ECU?

    ...Opti distributor only & crank trigger pickup.
    Is this a C950 ECU controlled timing application?
    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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