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Supercharger vs brake booster

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  • Supercharger vs brake booster

    Maybe it's late and I'm not thinking this through, but where do you get your vacuum on a supercharged engine to run the power brake booster.
    Thanks,
    Jim

    Jim

    1966 Avanti II RQA 0088
    Jim
    Often in error, never in doubt
    http://rabidsnailracing.blogspot.com/

    ____1966 Avanti II RQA 0088_______________1963 Avanti R2 63R3152____________http://rabidsnailracing.blogspot.com/

  • #2
    Off the intake manifold, same as usual. The engine still develops vacuum at most throttle positions. Since you usually let up on the gas a few seconds before applying the brakes, the booster has a chance to "charge." And the booster has a vacuum reservoir with a check valve, so you'll have some vacuum there at almost any time. Short of repeatedly applying the brake while driving at wide-open throttle, it'd be pretty hard to deplete the vacuum in the booster.

    Now you DO want be sure the check valve is good. Shut the engine down, and see how many brake applications are needed to deplete the vacuum.

    Gord Richmond, within Weasel range of the Alberta Badlands
    Gord Richmond, within Weasel range of the Alberta Badlands

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    • #3
      Usually its from using "too big" of a cam that kills your vacuum. The
      supercharger should be fine, unless you add it to a wild cam too. But
      thats just going to make an awful street car.

      Tom

      '63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires
      '63 Avanti R1, '03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, TKO 5-spd, Ported heads w/SST full flow valves.
      Check out my disc brake adapters to install 1994-2004 Mustang disc brakes on your Studebaker!!
      http://forum.studebakerdriversclub.c...bracket-update
      I have also written many TECH how to articles, do a search for my Forum name to find them

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      • #4
        Thanks, guys. I should have remembered the vacuum reservoir. Sometimes you just get thinking about something and can't see the forest for the trees.

        Jim

        1966 Avanti II RQA 0088
        Jim
        Often in error, never in doubt
        http://rabidsnailracing.blogspot.com/

        ____1966 Avanti II RQA 0088_______________1963 Avanti R2 63R3152____________http://rabidsnailracing.blogspot.com/

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        • #5
          quote:Originally posted by sbca96

          Usually its from using "too big" of a cam that kills your vacuum. The
          supercharger should be fine, unless you add it to a wild cam too. But
          thats just going to make an awful street car.
          Yes! My son had a '79 Corvette in which he really built up the engine including a wild cam. He has so little vacuum that he couldn't contol his heater/ac valves or his headlight doors (had to install a vacuum pump to solve the problem).


          [img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/R-4.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64L.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64P.jpg[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/53K.jpg[/img=right]Paul Johnson
          '53 Commander Starliner (since 1966)
          '64 Daytona Wagonaire (original owner)
          '64 Daytona Convertible (2006)
          Museum R-4 engine
          Paul Johnson, Wild and Wonderful West Virginia.
          '64 Daytona Wagonaire, '64 Avanti R-1, Museum R-4 engine, '72 Gravely Model 430 with Onan engine

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