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Thread: 200 Horsepower

  1. #1

    Default 200 Horsepower

    I wonder if the Sniper's 200 HP minimum will pose a problem. My 1977 International Harvester 345 CID V-8 is rated as:
    Brake H.P. (Max) @ RPM 196.7 @ 4000
    Brake H.P. (Net) @ RPM 168 @ 3800
    Torque (Max) Lb. Ft. @ RPM 309 @ 2200-2400
    Torque (Net) Lb. Ft. @ RPM 288 @ 2000

    I'm currently running an Edelbrock Performer square-bore 650 CFM 4BBL on top of an older IHC square-bore 4BBL manifold which will remain.
    It runs good, no hesitation if I stomp on it in Drive from a stop.
    Click image for larger version. 

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  2. #2
    Join Date
    Oct 2016
    Location
    Albuquerque, NM
    Posts
    69

    Default

    The minimum is actually 250 HP (from the Holley Quick Start Manual, page 2).

  3. #3

    Default

    Add a 150 shot of nitrous. Problem solved :-). Your engine makes a lot of torque. So I would go to WOT with a vacuum gauge. If it goes to a least 1" at WOT, then I would definitely consider using the Sniper EFI system.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,700

    Default

    Quote Originally Posted by bryaneh View Post
    The minimum is actually 250 HP (from the Holley Quick Start Manual, page 2).
    Correct, the Sniper Quick Start Manual states 250 HP minimum.

    Quote Originally Posted by BITE_ME View Post
    So I would go to WOT with a vacuum gauge. If it goes to a least 1" at WOT, then I would definitely consider using the Sniper EFI system.
    The problem is the fuel injector pulse width may be too low (msec) to idle properly (especially with 60 psi of fuel pressure).
    You could install a remote fuel pressure regulator and lower the fuel pressure, which increases the injector pulse width at idle.
    http://documents.holley.com/techlibrary_r10179-1.pdf (Holley TBI Hardware Manual - "Idle Fuel Pulse Width", Page 16)
    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

  5. #5

    Default

    It's 345 ci. That's a good volume of air even idling. If it's too "rich" at idle, changing the PSI, or installing smaller injectors could be an option. If the EFI software allows it to be changed.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,700

    Default

    Quote Originally Posted by BITE_ME View Post
    ...changing the PSI, or installing smaller injectors could be an option. If the EFI software allows it to be changed.
    Changing the injectors is probably not an option, but changing the fuel pressure is in the Sniper EFI software (Actual System Pressure parameter in EFI Parameters/System Parameters).
    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

  7. #7

    Default

    So I called Holley Tech Support, they said there is no problem. I have bookmarked this, so if there IS an issue I can find the great suggestions posted here; thank you!

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