Gear ratio

Discussion in 'PSI Superchargers Tech Questions' started by Ozzy Osborn, Jun 5, 2013.

  1. Ozzy Osborn

    Ozzy Osborn Member

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    Hi all,
    I'm trying to determine which gear ratio is best for a 3 speed B&J. Car is 270 inch top alky dragster chassis, engine is 461 KB, 1st generation Whipple screw blower at 39 over. Three disc pedal clutch. Tire is 34.5/17/16. With the 2 speed, best 60 ft time was .990. Any suggestions?
     
    #1
    Ozzy Osborn, Jun 5, 2013
  2. alky526

    alky526 New Member

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    Tough decision

    I've found running 1.89 first gear is slightly base/aggressive but 1.76 can give you more tuning area if you are running slippery tracks.
     
    #2
    alky526, Jun 5, 2013
  3. Ken Sitko

    Ken Sitko Super Comp

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    I would suggest a 1.80 low with a 4.56 or even a 4.72 rear end.
     
    #3
    Ken Sitko, Jun 6, 2013
  4. rb0804

    rb0804 Active Member

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    Are you running 1/8 or 1/4? What rear ratio did you have with the two speed?
     
    #4
    rb0804, Jun 9, 2013

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