[Fot] Rear End Ratios

[Larry Young]

John,
A 4:1 rear with overdrive (0..82) is 3.28.  Unless you've changed it 
since I had it, it has a 4.55 rear, which gives 3.73 in overdrive. This 
is close to the standard top gear of 3.7 which most racers run.  You 
must be making good power to reach 6200 at the end of a long straight.  
I think there is something like a 4.3 R&P ratio available, but I think I 
would stick with the current setup and live with 6200.  Some guys spin 
there motors a lot higher than that
Larry Young

On 7/1/2013 11:57 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