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Who here overspins their 2.9l whipple?

Discussion in 'Engine/Tuning' started by MG0h3, Mar 4, 2017.

  1. MG0h3

    MG0h3 Well-Known Member Established Member

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    Location:
    El Paso, TX
    Currently on stock lower and 2.9 upper so max rpm at 6500 is 16,586.

    Im considering getting a 4lb caged lower (anyone know the exact size of the pulley? Same as Metco at 8.6?)

    If I kept the 2.9, Id be seeing 19,275 at 6500. I rarely ever take it there...almost an accident if I do. If I even run it that hard itll be @6200 which is 18300 or so.

    Just curious who else overspins theirs and if there has even been an issue.

    Thanks
     
  2. holiks03cobra

    holiks03cobra Active Member Established Member

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    Feb 11, 2007
    Location:
    Granite City, IL
    I had a 3.00 upper and 4lb lower setup . It was making about 26lbs of boost. I now have the 3.00 with a 2lb lower making about 24lbs of boost. That was with a set of mac 1-5/8 headers. I have kooks 1-3/4 headers now. Not sure if that will drop the boost down a tad or not. I usually shift at around 6100 to 6200. I haven't had any problems with the blower with either pulley combos.
     
  3. holiks03cobra

    holiks03cobra Active Member Established Member

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    Feb 11, 2007
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    Just to clarify, Idk if the kooks dropped any boost over the macs because I'm breaking in/working problems out on a new motor.
     
  4. stangfreak

    stangfreak Well-Known Member Established Member

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    I was told by whipple I was overspinning mine with a 3.25 upper 4lb lower. I gained no power and my tq curve was flat. It looked horrible. No arc nothing. I dropped it back to a 3.5 upper and my tq curve is back to normal. I have been over spinning blowers for 14 years with this car. Never had this happen to me
     
  5. MG0h3

    MG0h3 Well-Known Member Established Member

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    Thats odd. Just did the math and thats 17200 at 6500 rpm? Its lower divided by upper times RPM right?

    Thanks all for the info.
     
  6. MalcolmV8

    MalcolmV8 Well-Known Member Established Member

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    Tampa, FL
    I ran a 3.0 upper and 4 lb lower and shifted at 7k with my 2.9 Crusher. No issues.
     
    Last edited: Mar 6, 2017
    MineralCobra and xxjaymanzxx like this.
  7. nxhappy

    nxhappy Well-Known Member Established Member

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    Whipple makes some tough shit. Over-spinning it a little should not be a problem...
     
    Zemedici likes this.
  8. stangfreak

    stangfreak Well-Known Member Established Member

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    I believe so. I have no Idea why whipple said that. Later down the line I will do turbo. Been playing and swapping blowers for 14 years with this car lol.
     
  9. blckRadda

    blckRadda Member Established Member

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    Dec 4, 2011
    Location:
    Phila
    For anybody who's questions over spinning Whipple Supercharger look at the lightning crowd and how hard they spin those 2.3's and keep on moving.


    Sent from my iPhone using Tapatalk
     
  10. MG0h3

    MG0h3 Well-Known Member Established Member

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    Location:
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    Thanks for all the info guys. Ill keep looking for a caged lower.
     

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