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Thread: jetting carb

  1. #1

    jetting carb

    i have a jetting ? when the weather gets hot do you go up(rich) on the jet sizes or do you go down(lean) and ideas. 1/8 mile drag car with sbc running 114 sunnco race fuel.single carb 850 holley hp

  2. #2

  3. #3
    Senior Member RACING JUNKIE curtisreed's Avatar
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    Quote Originally Posted by wrightway
    Down
    X2

  4. #4
    Senior Member MASTER BUILDER
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    hot weather

    what do you guys do with the timing in the real hot weather. up, down, or leave it as is ? thanks chevy art

  5. #5
    Senior Member MASTER BUILDER
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    When the weather gets hot or the altitude goes up, the air gets worse so you can't burn as much fuel so you need smaller jets. I usually only alter the jetting two sizes.

    I only alter the timing when the car is over powering the track (retard it 1 - 1 1/2 degrees. If I'm wanting to set her on kill I advance it 1 - 2 degrees. Just make sure you're checking your plug condition after each run to avoid detonation etc.
    It Ain't Over Til Its NOVA - 634ci of S*#t Your Pants!

  6. #6
    Senior Member DYNO OPERATOR
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    over powering the track= spining the tires?

  7. #7
    Senior Member MASTER BUILDER
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    Quote Originally Posted by JEFF69Z28
    over powering the track= spining the tires?
    Yep. Some tracks aren't prepped that well. With a glide, convertor and nitrous motor there aren't too many options to get traction without losing too much power.
    It Ain't Over Til Its NOVA - 634ci of S*#t Your Pants!

  8. #8
    Senior Member RACING JUNKIE
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    I never mess with mine. I leave it the same all the time.











    Of course I also lose in the first round most of the time too. :lol:

  9. #9
    Senior Member RACING JUNKIE
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    I agree, hot/humid weather likes a leaner A/F ratio.

    Jetting it down will aslo make it more consistent if you race where theres a temp drop from TT's to elims , E.G> daytime TT & nighttime racing.



    I jet for consistency - not power/ET.\

    Cp
    ***IN GOD WE TRUST***


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