Starting autocross build
Thread Starter
Teching In
Joined: Sep 2014
Posts: 17
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From: Indiana
Starting autocross build I need help on what gears I should run for an autocross car. Also should I upgrade to a different size rear? My car makes about 350 right now but I'm about to start putting some more money in it at the beginning of next year to get it to 450 to 500.
Thanks for all your help.
Thanks for all your help.
Teching In
Joined: Sep 2014
Posts: 11
Likes: 0
The best advice I can give is find someone in your area that autocrosses with a similar car. Rear axle ratios are heavily dependent on what gear(s) you run the course in, tire size and traction and most importantly torque curve.
I don't autocross myself but a bunch of my friends do. They spend more time on tire, spring and shock changes that rear axle ratio changes.
All of my focus is on road course and endurance racing. Wish I could be more help.
I don't autocross myself but a bunch of my friends do. They spend more time on tire, spring and shock changes that rear axle ratio changes.
All of my focus is on road course and endurance racing. Wish I could be more help.
Need some more info- car/transmission/tire size. For the average autocross courses with a 6 speed f-body, 3:42 is close to ideal. Allows you to run most courses in second gear, gets you over 70 depending on your rev limit which should handle most courses. I would go and check out the size of the courses your region runs as this will influence what gear you run.
12 Second Club
Joined: Sep 2005
Posts: 4,273
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From: Bucks County, Pa.
Need some more info- car/transmission/tire size. For the average autocross courses with a 6 speed f-body, 3:42 is close to ideal. Allows you to run most courses in second gear, gets you over 70 depending on your rev limit which should handle most courses. I would go and check out the size of the courses your region runs as this will influence what gear you run.
Just FYI; a standard LS1 f body T56 through 3.73s yields the same overall ratios as a 3.42 equipped, C5 Z06's tighter ratio, MN12 T56.
