Ground Controls - Let's discuss spring rates...

[M3Bimmerbilly]

I have 550f 650r on koni single adjust with GC camber plates. Stock sways. I track my car and really dont have any issues with it. Its plenty sporty and understeers at the limit. At barber it was virtually perfect mated with the M52 up front. of course, im just running street tires in the advance solo HPDE groups. I have no timing to base my setup on.

I drive it to work on occasion as its not too terribly stiff and i would drive it anywhere to do a trackday

[dinanm3atl]

I have 550f 650r on koni single adjust with GC camber plates. Stock sways. I track my car and really dont have any issues with it. Its plenty sporty and understeers at the limit. At barber it was virtually perfect mated with the M52 up front. of course, im just running street tires in the advance solo HPDE groups. I have no timing to base my setup on.

I drive it to work on occasion as its not too terribly stiff and i would drive it anywhere to do a trackday

Thanks. You are local. Can you ever make it to a meet? Would like a ride. See how it feels.

More spring or potentially rear bar tuning would be needed. I don't want understeer. Not horrible but rather a little oversteer at the limit.

[Jean]

I was running on 500front/650rear with bilstein sports, gc camber plates and rt615 tires, stock front sway/no rear sway when I autocrossed one of the previous seasons. It handled well and was still drivable but I felt that the shock valving was not ideal with off the shelf bilstein sports with these spring rates, but keep in mind I had the thinner front struts at the time.



Now that I know the car's corner weights, I am waiting to hear back what GC will recommend for new rates, also with a change of the front bar to the 21mm cabrio bar and tire / wheel change as well. (from 195/60 rt615 to 225/50 v710 on 15x8 ).

[Jean]

My M30 car is running 650f/950r, and with the proper shocks, the car is quite a blast to drive. Jay at GC did make me promise him that I would never drive this car on the street though :p

Wow, what sways? How much does the car weight?