Gear Ratios For Rootes Blower FC's

Discussion in 'PSI Superchargers Tech Questions' started by Mike Canter, Feb 26, 2007.

  1. Mike Canter

    Mike Canter Top Dragster
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    Can somebody email me what the most common rear gears are and what the 1st gear and 2nd gear used in a Lenco for FCs using Roots blowers. I am trying to figure out the best gearing to experiment with in a blown ProMod. Thanks

    My email is mike.c@mindspring.com or you can send me PM.
     
    #1
    Mike Canter, Feb 26, 2007
  2. bottomdollar

    bottomdollar New Member

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    gear

    in pro mod a good start is 4,56 rear with 41&44 or 44&44 GEAR SET. Any question fell free to call willie 918-724-0941
     
    #2
    bottomdollar, Feb 26, 2007
  3. Mike Canter

    Mike Canter Top Dragster
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    Thanks for the tip but that is not what I am after. I am trying a different combination.
     
    #3
    Mike Canter, Feb 26, 2007
  4. Tim Stevens

    Tim Stevens new

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    Hey Mike, MOST IHRA FC's are pulling a 1.75 low w/a 4.30 rear "some are in the 1.80's and I know of some that have tried 1.68 area. Sorry, can't give you the ratios to get there TOP SECRET! But I am sure you can get there with a calculator!
     
    #4
    Tim Stevens, Feb 27, 2007
  5. HEMIdude

    HEMIdude New Member

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    WE didn't get away from consistent severe tire shake in our blown hemi T/S -Q-16 car until we moved 1st gear from 1.90's to the 1.60 - 1.70 range.
     
    #5
    HEMIdude, Feb 27, 2007
  6. M Tigges

    M Tigges TAFC

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    Hello Mike, We always used a 1.75 first and ethier a 1.34 or 1.37 2nd.
     
    #6
    Last edited: Feb 27, 2007
    M Tigges, Feb 27, 2007
  7. Lonnie Houde

    Lonnie Houde Member

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    Mike,

    I would def listen to these guys. As you probably know, Fred Tigges is a consistent heavy hitter in IHRA!!!!!!
     
    #7
    Lonnie Houde, Feb 27, 2007
  8. Mike Canter

    Mike Canter Top Dragster
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    I am listening and appreciate all the inputs. Now I have to add all that to what I have already have tried and figure out which is best for our engine torque and car weight.:)

    Thanks again to all;)
     
    #8
    Mike Canter, Feb 27, 2007
  9. HEMIdude

    HEMIdude New Member

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    Hey Mike,
    For some of our learning curves, what are some of the things you've tried and what were their results?
     
    #9
    HEMIdude, Feb 27, 2007
  10. Mike Canter

    Mike Canter Top Dragster
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    Not for release yet. Maybe some time later as I am still trying to figure it out. Our Ford Hemi motor has a different torque curve as compared to a BAE motor which most ProMods and FCs use. Not too many blown Ford Hemi guys to learn from so life is a little harder.
     
    #10
    Mike Canter, Feb 27, 2007

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