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Thread: GM OBDI + FAST throttle body for carb to EFI conversion?

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  1. #1
    GearheadDezign.com woody80z28's Avatar
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    GM OBDI + FAST throttle body for carb to EFI conversion?

    I have an idea that seems like it should work... Taking FAST's complete 4150 throttle body and make it work with a GM OBDI computer system? The tb will sit right on a carb manifold and it has 4 injectors below the throttle plates that are supposed to support up to 600hp.


    http://www.compperformancegroupstore...Code=4150Style

    I don't see why it couldn't be done. The MAP, TPS, IAC & IAT are all GM sensors, and the fuel injectors look like standard plugs. Seems like a Beretta or Cavalier 4cyl ECM could be used to control it (with the spark tables removed and the fueling tables modified obviously). Maybe even a TBI computer would work if you spliced 2 pairs of injectors together.

    I already have two GM OBDI vehicles, and I'm thinking this would be a pretty sweet sweet way to convert the third from carb to EFI.
    80 Camaro Z28 - 550hp AFR 383 EFI / T56 6spd
    91 Beretta "SS" - 220hp 3400 MPFI / HM282 5spd
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd build thread

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    Registered User dave w's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Howell Fuel Injection did something like that, but can't find the info on the website. I saved a picture on my HD. Looks like an OBD I '7730 ECM.

    dave w

    Last edited by dave w; 06-23-2010 at 09:20 PM.

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    No More Mr Niceguy xch3no2's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Appears to be SD (no MAF) so it could run on a port mod EBL..

    There is a brand new, installed, port mod EBL for sale on 3rdGen. He wants $350

    Damn them Fast TB's are sweet for a wet system.
    Last edited by xch3no2; 06-23-2010 at 10:53 PM.
    89 K3500 RCLB- Fat Snarling RAT..Scat/Eagle/Crower/Crane/Edelbrock/MSD..TBI/EBL/TH400/Dana 60

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    GearheadDezign.com woody80z28's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Quote Originally Posted by dave w View Post
    Howell Fuel Injection did something like that, but can't find the info on the website. I saved a picture on my HD. Looks like an OBD I '7730 ECM.

    dave w

    Jackpot! That's exactly what I was thinking!

    Found the link:
    http://www.howellefi.com/customer/tb...v8-engine.html
    80 Camaro Z28 - 550hp AFR 383 EFI / T56 6spd
    91 Beretta "SS" - 220hp 3400 MPFI / HM282 5spd
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd build thread

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    Registered User hourang's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    is this a performance build? i would just get a tbi system from the junkyard and a tbi carb adapter. much cheaper.
    Jeff-
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    GearheadDezign.com woody80z28's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Quote Originally Posted by hourang View Post
    is this a performance build? i would just get a tbi system from the junkyard and a tbi carb adapter. much cheaper.
    I'm sure a TBI wouldn't support my HP level. I gained 3mph in the 1/4 switching from a 600 to 750cfm carb because the 600 was choking the engine.


    I just emailed Howell to see if they supply the TunerPro files needed to datalog & tune, etc.
    80 Camaro Z28 - 550hp AFR 383 EFI / T56 6spd
    91 Beretta "SS" - 220hp 3400 MPFI / HM282 5spd
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd build thread

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    Registered User hourang's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Quote Originally Posted by woody80z28 View Post
    I'm sure a TBI wouldn't support my HP level. I gained 3mph in the 1/4 switching from a 600 to 750cfm carb because the 600 was choking the engine.


    I just emailed Howell to see if they supply the TunerPro files needed to datalog & tune, etc.
    yeah thats why i asked if it was a performance build.
    Jeff-
    Play Supreme Deer Hunting
    2001 Silverado Z71 ext cab - 5.3l v8 4x4 Silver - airaid intake, cone filter, flopro muffler

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    Registered User hourang's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    you could always run a ported 454 tbi unit, they are 54mm , not sure on cfm but the holly 650cfm tbi unit is 52mm. probably only good til like 450hp tho.
    Last edited by hourang; 06-24-2010 at 12:15 PM.
    Jeff-
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    Registered User hourang's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    http://www.auto-nomics.com/cgi-bin/s...part=12168-001

    or that can be run on a tbi computer. not sure on details but its 4 bores and over half the price of the FAST.
    Jeff-
    Play Supreme Deer Hunting
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    GearheadDezign.com woody80z28's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    The cfm rating on the stock-style TB is dry though. With the injectors spraying fuel it goes down. I saw that other TB you posted a while ago, and I think the FAST unit is a better piece. The throttle plates are a lot smaller on the autonomics and it makes me wonder what the cfm is. I know the FAST one is more than enough to support my current & future mods.
    80 Camaro Z28 - 550hp AFR 383 EFI / T56 6spd
    91 Beretta "SS" - 220hp 3400 MPFI / HM282 5spd
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd build thread

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    No More Mr Niceguy xch3no2's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    That makes the Howell a $500 ECM. That would be OK if the rig had an E-trans.

    It should be easy to find that EBL on 3rdGen..
    89 K3500 RCLB- Fat Snarling RAT..Scat/Eagle/Crower/Crane/Edelbrock/MSD..TBI/EBL/TH400/Dana 60

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    Registered User DrkZide's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Could this possibly improve fuel mileage as well?

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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    i have been told by several people to keep the injectors over the throttle blades to help atomize the fuel. with them spraying under the blades fuel will tend to puddle on the manifold floor and cause poor idle and all kinds of wierd things. if your still interested check out motorvation 4 bbl tbi kit. i think its an accel tbi that theyre using.....i think
    Last edited by whitelightnin92; 06-25-2010 at 02:08 AM.

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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    you can use the stock 94 ecm by just modding the memcal with a jumper. to control 4 injectors

    69 C10
    http://www.fullsizechevy.com/showthr...y+project+pics

    72 C10 stepside RAT
    355/350/14bolt 3.73 posi

    92 k1500
    1/4 16.024 @ 84 MPH

    2006 ECSB 5.3
    1/4 15.588 @89.96 STOCK

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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    i would use one of the 4 bbl holley tbi units. a little less expensive. actually if it was me id probably run dual stock tbi units.

    69 C10
    http://www.fullsizechevy.com/showthr...y+project+pics

    72 C10 stepside RAT
    355/350/14bolt 3.73 posi

    92 k1500
    1/4 16.024 @ 84 MPH

    2006 ECSB 5.3
    1/4 15.588 @89.96 STOCK

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    No More Mr Niceguy xch3no2's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    I was having kinda the same thought, wondering what kind of nozzles are on those big injectors.
    Last edited by xch3no2; 06-25-2010 at 07:26 PM.
    89 K3500 RCLB- Fat Snarling RAT..Scat/Eagle/Crower/Crane/Edelbrock/MSD..TBI/EBL/TH400/Dana 60

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    Registered User hourang's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Quote Originally Posted by woody80z28 View Post
    The cfm rating on the stock-style TB is dry though. With the injectors spraying fuel it goes down. I saw that other TB you posted a while ago, and I think the FAST unit is a better piece. The throttle plates are a lot smaller on the autonomics and it makes me wonder what the cfm is. I know the FAST one is more than enough to support my current & future mods.
    i would ask them what the cfm rating is and hp potential. it would be worth looking into considering its only $399 and can be run with a stock computer. shoot im pretty sure i have a tbi computer from a 92 camaro you can have if you want.
    Jeff-
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    2001 Silverado Z71 ext cab - 5.3l v8 4x4 Silver - airaid intake, cone filter, flopro muffler

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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Just out of curiosity. Why is everyone figuring out TBI methods instead of just going direct port and using an AEM ECM? Is it a cost issue? You can buy a sensor kit from Jegs, get a used LS3 manifold and AEM for about the same cost as what was posted for that kit.

  19. #19
    No More Mr Niceguy xch3no2's Avatar
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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    (4) 85# injectors. ya buddy it could deliver some fuel...
    89 K3500 RCLB- Fat Snarling RAT..Scat/Eagle/Crower/Crane/Edelbrock/MSD..TBI/EBL/TH400/Dana 60

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    Re: GM OBDI + FAST throttle body for carb to EFI conversion?

    Quote Originally Posted by DrkZide View Post
    Just out of curiosity. Why is everyone figuring out TBI methods instead of just going direct port and using an AEM ECM? Is it a cost issue? You can buy a sensor kit from Jegs, get a used LS3 manifold and AEM for about the same cost as what was posted for that kit.
    thats kind of like asking why you would put a carb on a motor when there are so many better options. tbi has more than proven itself over the years and it provides super simple reliable fuel injection.
    Last edited by whitelightnin92; 06-26-2010 at 01:58 AM.

    69 C10
    http://www.fullsizechevy.com/showthr...y+project+pics

    72 C10 stepside RAT
    355/350/14bolt 3.73 posi

    92 k1500
    1/4 16.024 @ 84 MPH

    2006 ECSB 5.3
    1/4 15.588 @89.96 STOCK

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