Bruno pressure bypass

Discussion in 'PSI Superchargers Tech Questions' started by sammy christian, Jun 27, 2017.

  1. sammy christian

    sammy christian Member

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    anyone currently using this to make the convertor act looser at launch?
    current convertor is a little tight at leave but maybe borderline loose at the boost level we're at by the shift.
    not running much overdrive on the procharger so it leaves around 8# and is tough to control wheelspeed.
     
    #1
    sammy christian, Jun 27, 2017
  2. Mike Canter

    Mike Canter Top Dragster
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    What does your Bruno pressure read at 3000 rpm?
     
    #2
    Mike Canter, Jun 27, 2017
  3. sammy christian

    sammy christian Member

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    Have never checked at 3000, will do this weekend.
    last decent pass,
    it was 120# on 2-step@4600
    dropped to 60# at middle of low gear (6600), approx. .75 sec
    recovered to 115# immediately after shift (7050).
    did the roughly same thing in second gear,
    then after high gear shift (7400) it dropped to around 85-90 and stayed there to 1/8mi.
    RPM drop on shift is 400 1-2 & 700 2-3
    maybe making 2000HP
    neal chance billet, not NXS, 35 pump, 35 stator.
    This is a BBC procharger in 2700# car.
     
    #3
    sammy christian, Jun 28, 2017
    Blown5402 likes this.
  4. Mike Canter

    Mike Canter Top Dragster
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    You should check and adjust Bruno pressure with the tranny in neutral and at 3000 rpm so the needle is steady. The normal is 150 lbs of pressure. check it and see what it is at and let me know. It is normal to drop in pressure during the run and increase right on launch and at the gear shift. The normal rpm drop on a shift that Marty wants on a NXS is 800 rpm. You should call him and ask if it is the same for yours if so you might need a stator change
     
    #4
    Mike Canter, Jun 28, 2017

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