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Thread: Terminator TBI unit tuning question(s).

  1. #1

    Default Terminator TBI unit tuning question(s).

    Aside from the ability to setup progressive linkage and secondary percentage different from the primaries on Holley TBI units, is it possible to "stagger jet" them similar to what you could do with a carb? I'm sure the hardware (HP/Dominator) is capable of doing it since they can do individual cylinder offsets and trim, delay, etc., when used as a multi-port setup.

    I guess what I'm really asking is, does Holley have any plans to add more software tuning options for the 4BBL TBI units, or are we just limited to experimentation with user created tables?

    Watched most recent episode of Engine Masters comparing carb to TBI units in a blow-through application, and they were quick to point out the Holley TBI did not allow them to stagger jet like a carb does. I know they designed the TBI units to be as close to plug & play as possible for dinosaurs and old school carb guys, but some Advanced Tables that would allow 4-corner tuning would really be helpful, especially for guys running old engines with very limited intake manifold options.

  2. #2
    Join Date
    Nov 2014
    Ont. Canada


    You could get a Dual Sync Distributor, then set it up as MPFI and four cylinders. This would let you trim the fuel on each corner. But there may be other tuning issues. At WOT when the DC is close to 100%, the fuel to the two cylinders at each corner would be very similar. But at light and medium throttle, each injector will only fire once every two crankshaft rotations and for a short period of time. So one of the cylinders may get most of the fuel from that corner. If I remember correctly, when it's in TBI mode, it will batch fire the injectors to help with distribution. I can't see this being a good idea for a daily driver.

  3. #3
    Join Date
    Dec 2009


    Staggered fueling isn’t necessary for TBI EFI.
    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, R134a 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.

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