Top Speeds for Road Atlanta

[RR]

Hi guys, couple of us are heading to RA later this year for a regional and then the ARRC. I have 2 diffs for my car for different top speeds. Can someone tell me what kind of top speeds a good ITS car will hit at Road Atlanta. Thanks for the help

[Mazmarc63]

All the fast Rx-7's use a 5.12.

Right Kent?

I suspect 130 mph is about right.

[seckerich]

Some of the alternate rear gears may be better on the back straight but you will get killed out of 7 and uphill into 1. Go with the 5.12. Don't have telemetry from RA to give you speed numbers. Seems like 125-128 rings a bell.

[gsbaker]

The last time I was there was in a street Porsche 996. 3,000# w/300hp. About 130 braking into T10 if you launch well, FWIW.