8977 or 8979

Discussion in 'PSI Superchargers Tech Questions' started by caseyspradlin, Nov 19, 2010.

  1. caseyspradlin

    caseyspradlin Member

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    why would I need to take timing out based on boost?
     
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    caseyspradlin, Nov 19, 2010
  2. Mike Canter

    Mike Canter Top Dragster
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    One reason would be if you had a valve train failure that shut off a single cylinder. If this happens the the boost to the remaining cylinders increases and you can go into detonation and destroy the motor. So if you always had 42 lbs of boost you go set it up for 43 or 44 lbs to pull out timing.
     
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    Mike Canter, Nov 19, 2010
  3. underby6

    underby6 Active Member

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    I had Leahy make me a solenoid that when it reached "x" psi, it activated the safety box (kill mag/shut off fuel/chutes). This has saved us twice this past season, both times a rocker broke and it would have been a bad bad day had it not shut stuff down. It was very reasonable, under $100, you could run it to your ignition if you don't run the safety box.

    Brandon Booher
    NHRA TAD #34
     
    #3
    underby6, Nov 19, 2010
  4. aj481x

    aj481x Member

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    Gorr also addresses this in a different way with a switch (valve) that adds more fuel if psi goes up. Boost retards are sometimes used same as RPM retards, to take away some timing at top end.
     
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    aj481x, Nov 19, 2010
  5. caseyspradlin

    caseyspradlin Member

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    30 psi max

    looks like is has a 30# max in the instructions, is this correct?
     
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    caseyspradlin, Nov 19, 2010

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