[Fot] Road America - Best gear ratio?

[Jack Wheeler]

 As a point of reference, I checked some of my old results sheets, and I was turning laps in the 2:41s with an SCCA legal TR-4 with slick tires.  This was 1989 - 1991, and I don't think the track has changed since then.
Jack

    On Thursday, March 2, 2023 at 03:49:35 PM EST, Robert Lang via Fot <fot at autox.team.net> wrote:  
 
  Addendum: 4.10 and o/d and you might be okay. Just checked my calcs on this. But 4.10 and no o/d and you'll redline in a lot of places at RA

Note: my assumptions are with 24 in tall tires on a TR6.
Also, I'm more concerned about chucking a rod or breaking the crank than how well I can pull out of any corner. So under 6k RPM is my rule of thumb.
Regards,rml

    On Thursday, March 2, 2023 at 11:39:15 AM EST, Robert Lang via Fot <fot at autox.team.net> wrote:  
 
  Road America is a high-speed track. You won't get under 3:00 with a 4.10. You'll be out of revs half-way down most of the straights. a 3.70 or 3.45 would be better choices. Gear for 115+ on the front straight, the back straight and the Kink to Canada.
Regards,Bob Lang

    On Thursday, March 2, 2023 at 03:39:29 AM EST, Michael Deweerd via Fot <fot at autox.team.net> wrote:  
 
 Amici, For the kastner cup Race at Road America what would be the ideal rear end ratio for a TR4?  Last time (2013) it seemed I could have used a lower ratio?Would a 3.50 be the better choice over the 4.10 I have in the car now?
I Redline at 6000 RPM.  -- 
Mike Deweerd_______________________________________________
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