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Adjustable PV or Crutch?

Discussion in 'General Carb Tech' started by smokehouse, Jan 27, 2016.

  1. smokehouse

    Joined:
    Jul 10, 2014
    What works better in your eyes? Bought a Quick Fuel carb and I am wondering if I should send it to CSU for a Powervalve(dont think he sells them?) or build a Crutch system myself? I know the crutch would be alot cheaper.
     
    smokehouse, Jan 27, 2016
    #1

  2. flyinhillbilly

    Joined:
    May 8, 2006
    It depends a lot in your skill level in my mind. The crutch is a proven system, and there are guys on here experimenting with other ways of opening the valve by using signals your engine already makes rather than relying on a compressor, Hobbs switch etc. the Rickracer trpv seems to be the hot setup at the moment.
     
    flyinhillbilly, Jan 27, 2016
    #2

  3. smokehouse

    Joined:
    Jul 10, 2014
    His setup is pretty cool. Looks like he is only crunching one side though, is that normal?
     
    smokehouse, Jan 27, 2016
    #3

  4. flyinhillbilly

    Joined:
    May 8, 2006
    Depends on how much power you're wanting to make. I just use a front OV in mine and jet the secondaries for wot. Usually once it crack the secondaries you could measure the transition to wfo in milliseconds, lol. If I ever reach the point that jets won't allow enough fuel in I'll add a rear PV.
     
    flyinhillbilly, Jan 27, 2016
    #4

  5. blown385

    Joined:
    Feb 17, 2007
    I was the one who started using turbine pressure to open the PVs , but after going to a turbo with less than 1:1 back pressure , it was unreliable .

    I could have got it to work with some lower spring pressure , but I went back to onboard air and a 3way solenoid and the 7531 pressure switch .

    This way I was able to keep the PV closed on the brake to build boost with lean fuel and more timing .

    It was the way to go at the track .
     
    blown385, Jan 27, 2016
    #5

  6. blown385

    Joined:
    Feb 17, 2007
    What would be cool is using onboard air a 3way solenoid and a PWM to control how fast or slow it ramps the pressure .

    Maybe use a boost controller and use a RPM base curve . You can put exactly the pressure you want on the PV at a given RPM . :thumbsup:
     
    blown385, Jan 27, 2016
    #6

  7. flyinhillbilly

    Joined:
    May 8, 2006
    Now there is a cool idea. I'll quit calling that the Rickracer mod, lol. I didn't know. The truth is I probably saw it in person and was too many beers in to pay any attention. Lol.
     
    flyinhillbilly, Jan 27, 2016
    #7

  8. blown385

    Joined:
    Feb 17, 2007

    I didnt mean it that way , :cheers: ........ And Im sure someone tried it before me..... lol
     
    blown385, Jan 27, 2016
    #8

  9. smokehouse

    Joined:
    Jul 10, 2014
    I'm building a HCI 5.0 with a devided ebay GT45, so I'm not sure on back pressure. Probably plenty.
     
    smokehouse, Jan 27, 2016
    #9

  10. M&M Turbochargers

    Joined:
    Jan 31, 2011
    If it has the 77/88mm turbine I bet not as much as you think
     
    M&M Turbochargers, Jan 28, 2016
    #10
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