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Thread: Injector Flow Rates?

  1. #1
    Fast Ted Guest

    Default Injector Flow Rates?

    Hi, it's been a long time but I'm needing help again. Can anyone tell me the difference between the red 250R-51AA injectors and the white 250R-123AA injectors? Flow rate? Impedance? Best ones to use on a 900 equipped 1/8 mile drag car? Is there a better upgrade? Where to purchase? Thanks a bunch. Ted

  2. #2
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    Quote Originally Posted by Fast Ted View Post
    Can anyone tell me the difference between the red 250R-51AA injectors and the white 250R-123AA injectors? Flow rate?
    Are these the older, black, round top, B2 injectors?
    Or the newer Delphi, harness connector top injectors?
    Do you know the lb/hr rating of these injectors? (I deal with Holley part numbers.)

    Impedance?
    All of Holley's TBI units use low impedance injectors.

    Best ones to use on a 900 equipped 1/8 mile drag car?
    It depends on the horsepower of the engine, not the vehicle.

    Is there a better upgrade?
    The new Delphi TBI injectors are better than the old B2 TBI injectors:
    http://www.holley.com/534-169.asp (injector pod upgrade kit)
    http://www.holley.com/522-43.asp (85 lb/hr injectors)
    http://www.holley.com/522-80.asp (75 lb/hr injectors)

    Where to purchase?
    http://www.holley.com/types/Commande...ce%20Parts.asp
    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
    Fast Ted Guest

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    Hi Danny. This is an older Pro-Jection system. My car is a '66 Ranchero weighing in at 3030 lbs. wet. Easy breathing 460 backed by a C-6 and 3.70 gears. Recently installed AFR gauge shows a bit lean on the top end and I'm running out of adjustment on the knobs. Are Pro-Jection injectors even available anymore? Thanks for getting back to me and have a great day!

  4. #4
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    Quote Originally Posted by Fast Ted View Post
    Are Pro-Jection injectors even available anymore?
    No, they're obsolete. The Delphi injectors I linked above, are available.
    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.

  5. #5
    Fast Ted Guest

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    Guess it's time to upgrade. Thanks again for your help.

  6. #6

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    Danny, I'd like to know if you can tell me what the part number is for the original injectors in the Holley 502-6 throttle body with the bubble top, what these injectors were rated at in lbs/hr, if there is a fuel table that will tell me the injector off times vs voltage as it is listed in the Holley EFI software and if these injectors were interchangeable with GM injector assuming the lbs/hr are the same? I don't need replacement injectors I'm just looking for this specific information. If you can help out in any way with answering these questions that would be great.

  7. #7
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    Contact Holley Tech Service (LINK).
    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.

  8. #8
    Join Date
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    Scraped from old Holley website, PPH = lbs/hr at 12 psi.

    Round Connector
    522-26: 85 PPH Red 900 cfm
    522-74: 65 PPH Yellow 700 cfm 502-6
    522-14: 57 PPH ??? 502-5
    522-36: 50 PPH Green 502-4, 7, 8
    522-27: 45 PPH Blue 502-3 504-13, 23

    FYI: Holley old-style TBI injectors were used in MoPar V-6 & V-8 TBIs in the '90s.

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