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Thread: EFI Acceleration vs Primary/Secondary Operation

  1. #1

    Default EFI Acceleration vs Primary/Secondary Operation

    So I've been running a QuadraJet forever with it's smaller primaries & huge secondaries. I'm used to the way it works. It takes off great on the primaries and my vacuum pod on the secondary air flaps are set light and drop at about 1/2 second. When that rush of fuel hits the tires, absolutely go up in smoke at speeds under about 40 MPH. I'm think the EFI will have a more linear acceleration curve to it. More along the lines of an electric motor operation, because there are no primary/secondary parts. Is this kind of what it does? Release measured amounts of fuel for the amount of air being introduced to keep everything in balance? If this is the case, then the only real changes will follow the actual power curve generated by the engine specs themselves. I.E. max toque @ 3200, max HP develops @ 5800 RPM, that sort of thing. Does that sound like a fair assessment? Is there a reaction time lag like you might get with a turbo or a supercharger while it spools up?

  2. #2
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    Quote Originally Posted by Firebob View Post
    Release measured amounts of fuel for the amount of air being introduced to keep everything in balance?
    Yes.

    If this is the case, then the only real changes will follow the actual power curve generated by the engine specs themselves.
    http://documents.holley.com/techlibrary_199r11259.pdf (Holley Sniper EFI Help File - "Acceleration Enrichment", Page 10)
    http://forums.holley.com/showthread....9444#post29444 (EFI Acceleration Enrichment In Carburetion Terms)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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