Blow through vs draw through Quadrajet

Discussion in 'The Venerable Q-Jet' started by Brandon Cocola, Aug 2, 2020.

  1. Brandon Cocola

    Brandon Cocola Well-Known Member

    Which is better, easier, what mods need to be done to make each work. I am thinking about a turbo setup and want to run a Quadrajet. I'm still not sure what engine I will end up doing this with, it may be the Buick 350 currently in my Skylark or a 5.3 LS I have.
  2. wkillgs

    wkillgs Gold Level Contributor

    Draw thru is easier. But there are downsides due to running an air/fuel mixture thru the will need turbo shaft seals to keep the gas from getting into the oil, and intercoolers are obviously not a good usable option. The carb will need a PEVR setup to maintain Power Enrichment (adequate fuel) for cases such as when you let off the gas but engine is still under boost. The old 78-83 turbo Buicks used a draw through setup with a Q-jet.
    Blow through will need the carb set up to handle the pressure, and a fuel system to maintain adequate fuel pressure over and above the boost pressure.

    I'm not up to date on the latest carb setups for blow-thru, Quick Fuel was the goto source in the past.

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