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Thread: What should my fuel pressure be at with 42LB injectors

  1. 06-05-2003, 09:54 PM #1
    Cyulost
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    What should my fuel pressure be at with 42LB injectors

    What should my pressure be at and exactly how do you set it. Vacuum on? Off?

    Brandon
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  2. 06-05-2003, 10:01 PM #2
    5150 LX
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    I've always set the F/P with the vacuum off, someone else recommended that you also plug off the vacuum line. Never have done that myself, but now that I think of it it does make sense.

    Can't help ya with where exactly you should initailly set the f/p at, so TTT for ya.
    Quote Originally Posted by Kato Engineering
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  3. 06-06-2003, 06:28 AM #3
    Alain K
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    40 psi with the vacuum off.
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  4. 06-06-2003, 08:07 AM #4
    lx-convertible
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    i have mine at 41
    Neil
    Engine: DSS Pro Bullet 306, Windsor Jr. heads, E303, 42lb inj., Cobra intake(fully ported lower)65mm TB, 80mm Mass Air, MSD 6BTM, MSD coil

    Power Adder: Novi 1K, Anderson PowerPipe, ASP 8 IN Crank. No PS, AC, SMOG.

    HP: 488.3
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    11.77 @ 119.9
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  5. 06-06-2003, 08:15 AM #5
    UNTCHBL
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    start with 40 and go from there.

    Brandon
    90 strawberry coupe
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  6. 06-06-2003, 03:29 PM #6
    regattacoupe
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    Mine is @ 39 and pig rich on the top end. idle's fine even without a bypass. BUT my accufab regulator ramps pressure on a 1:1 ratio.
    89 Coupe with parts stacked inside of it and about 30#'s of dust on it with no end in sight. :weird:





    Although I am collecting parts for a 12.5:1 393 :D
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  7. 06-06-2003, 04:03 PM #7
    Cyulost
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    Ok thanks guys. I set mine to 40 with the vacuum off and plugged. When I connected the vacuum line again, the pressure went down to about 32 PSI. Does that sound right?

    Thanks,
    Brandon
    91 LX, Novi 2000, AOD->T5 Swap, 76mm MAM, 42Lb Injectors, Kirban AFPR, 255LPH HP Pump, 5-Lug Conversion, Real Cobra R's(C58), 1 5/8 BBK Ceramic Longtubes, H-Pipe, Magnaflow Cat-Back, Tri-Ax
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  8. 06-06-2003, 05:33 PM #8
    UNTCHBL
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    yep, somthing like that. Brandon, alot of times surging can be from a rich condition. Somthing to take into consideration.

    Brandon
    90 strawberry coupe
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  9. 06-06-2003, 09:30 PM #9
    regattacoupe
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    yeah that sounds about right! And 99.9% of surge problems are Air/fuel.
    89 Coupe with parts stacked inside of it and about 30#'s of dust on it with no end in sight. :weird:





    Although I am collecting parts for a 12.5:1 393 :D
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  10. 06-08-2003, 12:09 AM #10
    Cyulost
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    The problem that I am having with the surging, is that what a custom chip and dyno tune fixes? I just need to get this thing figured out and get to the track!

    Brandon
    91 LX, Novi 2000, AOD->T5 Swap, 76mm MAM, 42Lb Injectors, Kirban AFPR, 255LPH HP Pump, 5-Lug Conversion, Real Cobra R's(C58), 1 5/8 BBK Ceramic Longtubes, H-Pipe, Magnaflow Cat-Back, Tri-Ax
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