whipple lean out

Discussion in 'PSI Superchargers Tech Questions' started by ansleev, Jul 23, 2008.

  1. ansleev

    ansleev Member

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    does a whipple react more like a roots or a psi when it comes to fuel lean outs
    i know most psi screws do not use high speed lean outs and roots use lean outs but what about the whipple 980 it is a screw just does not use as much overdrive as psi do most guys run lean outs or none on the whipple
    thanks
     
    #1
    ansleev, Jul 23, 2008
  2. david chesnutt

    david chesnutt sand rat

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    lean out

    with our set up we add fuel using our high speeds... start way rich and work your way back ...
     
    #2
    Last edited: Jul 23, 2008
    david chesnutt, Jul 23, 2008
  3. mbaker3

    mbaker3 New Member

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    Hey Eli!!!

    Eli, This sounds like what you were suggesting to do with the Roots blowers. Take what fuel is removed with the high speed lean out and add it to another spot , like the top of the blower.
    Hope this didn't mess up the thread!
     
    #3
    mbaker3, Jul 24, 2008
  4. Mike Canter

    Mike Canter Top Dragster
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    The fuel requirements of a Rootes blower are totally different from a PSI or Whipple screw blower because of the inefficiency of a Roots blower and the efficiency of a screw blower. According to Norm Drazy, the overall efficiency -- mechanical, volumetric and adiabatic -- of the Rootes begins at 40 percent and drops off to 20 percent at the end of a run. Drazy says his PSI maintains an overall efficiency of 60 percent throughout the run. So based on this you can see the difference in fuel requirements.
     
    #4
    Mike Canter, Jul 24, 2008
  5. JM

    JM Member

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    Screwed

    Treat your fuel system for the whipple the same as a PSI. I run normally open metered solinoids that time close on timers to put more fuel to the whipple at the top of 1st and 2nd gear.
     
    #5
    JM, Jul 24, 2008

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