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Thread: Ditching fmu

  1. #1
    SCH Member
    Join Date
    Jun 2003
    Posts
    59

    Ditching fmu

    I am new to the supercharged scene and have a few questions I would like answered. I have the novi-2000 running 8-9lbs of boost on a 302 stock bottom end with gt-40 aluminum heads b303 cam, cobra intake, 24lb injectors, fuel pressure is set at 30lbs at idle with vac. on, the FMU is 10:1, the mass air looks like a stock unit (can you calibrate a stock unit to 24lb injectors?).

    1. I see fuel pressures of over 110 psi at full boost is this normal?

    2. I want to go 36lb injectors with a matched mass air and get rid
    of my fmu would this work? or should I keep the fmu and get lower rate one? My car runs great at idle and WOT and I
    would like it to stay that way. Its just that over 100psi fuel
    pressure scares me.

    3. What does the novi 2000 set up on the stock 19lb injectors
    run as far as fuel pressure at 8lbs of boost?

    Any feed back will be greatly appreciated.
    I did search and didn't quite find the answers I was looking for.

  2. #2
    Long Time SCH Member Doug's Avatar
    Join Date
    Nov 2002
    Location
    San Diego
    Posts
    1,115

    Re: Ditching fmu

    1. I see fuel pressures of over 110 psi at full boost is this normal?
    Yes this is normal
    2. I want to go 36lb injectors with a matched mass air and get rid
    of my fmu would this work? or should I keep the fmu and get lower rate one? My car runs great at idle and WOT and I
    would like it to stay that way. Its just that over 100psi fuel
    pressure scares me.
    You will have no problems with the 36's, I did it and made 470+rwhp. I would suggest 42's with your current mods. It is very easy to take out fuel, but its hard to do if your out of injector.

    3. What does the novi 2000 set up on the stock 19lb injectors
    run as far as fuel pressure at 8lbs of boost?
    It runs about 100psi under boost
    Hope this helps
    Doug

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