[Fot] Rear End Ratios

[Jim Norlin]

Finally catching up on old e-mails. This may not be totally relevant to 
the TR3, but I'll toss it out for the group.  We normally run a 4.11 in 
our Spitfire and it works great at Portland without the chicane and at 
Seattle, both long straights.  When we went to the runoffs in 2010, I 
put together a 3.89 thinking I may over rev on the long straights at 
RA.  Bottom line is we couldn't pull that high of a ratio and went back 
to the 4.11, which worked great.

Jim

On 7/1/2013 9:57 AM, john hasty wrote:
> The overall ratio we have in the TR3A is 3.7 achieved with a 4.1 rear end
> and overdrive.  At VIR, Road Atlanta, Savanna and Mid Ohio, all with long
> straights, we are turning 6200 at the end of each of them.  Elkhart Lake has
> longer straights and we are concerned that we might need a taller rear end
> gear.  If we put 3.7 rear end gears in we would have an overall ratio of
> 3.66 which I believe would produce 800rpm less or the same as turning
> 7000rpm with the 4.1. I can't turn 7000 with a stock crank so;   Does anyone
> with experience at Elkhart have a suggestion?   What do you run there?
> Thanks guys/gals......
>
> John H. Hasty
> Attorney At Law
> Guthrie, Davis, Henderson & Staton, P.L.L.C.
> 719 East Boulevard
> Charlotte, North Carolina 28203-5113
> Tele: (704) 372-5600
> Fax: (704) 372-4601
> E-mail: jhhasty at gdhs.com
> www.gdhs.com
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