I would also consider using the OD in in other than top gear. Quick
shifting overdrive is sometimes more convenient in a tight and busy
situation. It can also give you better gearing by splitting gears. At
Hallett there is one very tight turn and with a close ratio gearbox,
first is too low and 2nd is too high but 1st overdrive is just right. I
didn't have an overdrive the one time I ran at VIR, but I was so busy
during the lead up to the the straight, I had wished I had an overdrive,
which only required the flick of a switch. That was one data point that
lead to me to reinstalling the overdrive. Again at Hallett, the
overdrive was really only needed on the straight (maybe), but I noticed
my son, Tom, would use it all over the track. It is just more convenient.
Larry
On 7/1/2013 3:25 PM, Kas Kastner wrote:
> That 4.55 will make you fly up the hill to the start line and off a
> lot of the slow corners. Live with it.
>
> *Never be beaten by equipment.*
>
>
>
> On Mon, Jul 1, 2013 at 1:00 PM, Larry Young <cartravel@pobox.com
>
> 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
>
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