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Jetting with boost

Discussion in 'Carburetor + Boost Tech Questions' started by vht, Aug 25, 2020.

  1. vht

    Joined:
    Feb 23, 2014
    Was thinking about this the other day, if you convert a Holley to blow thru and had the PV plugged and say 86 jets in the secondaries, would you drop the jetting back some when installing a BRPV? I've got a nice 850 DP with annular boosters that I was thinking about converting if I go turbo. I'll be running an AFR gauge but I was just curious about a starting point.
     
    vht, Aug 25, 2020
    #1

  2. turboisuzu

    Joined:
    Oct 29, 2018
    i had an air cooled vw shop tune my weber i wish i could be of more help sorry
     
    turboisuzu, Aug 26, 2020
    #2

  3. Mnlx

    Joined:
    Sep 20, 2009
    Typically, yes. The general rule of thumb is that most stock pvcr's are the equivalent of about 10 jet sizes. In the end, it's all decided by what the engine wants. You may not even need a pv in the secondary.
     
    Mnlx, Aug 26, 2020
    #3
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