question about aluminum ds

Discussion in '2005 - 2009 Specific Tech' started by blackjack21, Aug 12, 2008.

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  1. CBus 06 GT Member

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    It will really depend on the spread of power. If an engine has a narrow powerband where it makes good torque/HP over a narrow range of RPM, then you want to gear it so you shift 3 times (i.e. use 1st-4th). If you have a broader power curve like with a positive displacement blower, then a 2 shift run may be the way to go. Obviously, there are lots more variables than just that, you have to consider vehicle weight, how hard you can launch/available traction, and how quick you are with your shifts. With an N/A S197 running on DR's, changing the rear to 4.30 and getting a 3rd shift and carrying 6000+RPMs in 4th through the traps is probably the way to get the quickest E.T.
    CBus 06 GT, Sep 5, 2008
    #21

  2. TGJ New Member

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    2 - 3 tenths and 1 - 2 MPH regardless if you are F/I or N/A...

    I have tried shifting 1 - 4 and 1 - 3. I run slower E.T.s when I shift to 4th but I MPH higher. I run faster E.T.s when I stay in 3rd but MPH lower. I will trade MPH for a faster E.T. every day of the week. I have 3.55's with 26/11.5/17 MT ET Street Bias-ply tires when I race.
    TGJ, Sep 5, 2008
    #22

  3. shaftmasters New Member

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    shaftmasters, Sep 6, 2008
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  4. NastyStang113 New Member

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    Uhhh ... How do you figure there is more of a gain with F/I?
    NastyStang113, Sep 6, 2008
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  5. walter Founding Member

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    Has anyone had any experience with the Roush 26lb driveshaft they put in their Drag Pak cars?
    walter, Sep 19, 2008
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