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fuel pressure

This is a discussion on fuel pressure within the LT1 forums, part of the Vehicle Specific category; what is the average pressure for a stock motor with just about every bolt on there is except heads and ...

  1. #1
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    white
    96 ws6

    fuel pressure

    what is the average pressure for a stock motor with just about every bolt on there is except heads and a cam for getting the most horsepower out of my motor. i heard if u lean it out a little bit u can gain some horsepower.

  2. #2
    Senior Member 5.0THIS's Avatar
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    95 Z28

    uhh... you dont need to be messing with the fuel pressure to try to tune your car. That would be a huge no-no. Any tuning you do will be through the PCM. In there you can adjust all of your fuel and spark tables. I would recommend leaving PCM tuning to a pro, who has tuned late model cars (specifically F bodies) before.

  3. #3
    LT1 Guy
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    Quicksilver
    03 Corvette Z06

    Like stated by 5.0this, its typically not a good idea to use the fuel pressure to lean the car out. However. Your fuel pressure should be around 32-36lbs at idle. 36 being more average. I have seen a few cases were dropping it down to 35 psi has netted a few more ponies. I dont recommend it.

    Bring on the arguement.

  4. #4
    Senior Member 5.0THIS's Avatar
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    95 Z28

    Quote Originally Posted by 96slow6 View Post
    Like stated by 5.0this, its typically not a good idea to use the fuel pressure to lean the car out. However. Your fuel pressure should be around 32-36lbs at idle. 36 being more average. I have seen a few cases were dropping it down to 35 psi has netted a few more ponies. I dont recommend it.

    Bring on the arguement.

    Actually, base pressure on his car should be 43.5 psi, give or take

  5. #5
    LT1 Guy
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    Quicksilver
    03 Corvette Z06

    Actually! The pressure would be 42-43.5 at WOT. But 36 ish at Idle.

  6. #6
    Senior Member 5.0THIS's Avatar
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    Quote Originally Posted by 96slow6 View Post
    Actually! The pressure would be 42-43.5 at WOT. But 36 ish at Idle.
    vacuum line off= 43.5 psi, and the way most people check it.

  7. #7
    LT1 Guy
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    Quicksilver
    03 Corvette Z06

    Vaccum off simulates WOT. We are on the same page there. With the vaccum on it should drop 6-7 psi.

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