danswofford

I'm trying to settle on an initial spring rate for my new coilovers. What spring rates do you have on your coilovers and what wings, splitters or air dams do you have?

Monks

No wing or splitter, autocross car, DRM coil overs

Front 450#
Rear 600#, (trying a set of 550# next week)

Russ

vette.se

I currently use 450 front and 600 rear. Roadrace car with no wing or splitter. I got that recommendation from DRM.

Recently I talked to Lou at LG Motorsports and he have a different opinion about spring rates. This was his answer:


If you have stock rear shock pickups on the car you have a different effective wheel rate than a modified shock pick up. The other factor is the angle of the shocks. With the stock shock angle in the rear, you have a “digressive rate” since the wheel rate changes with every inch of wheel travel for the worse. The rear shock angle changes so rapidly that you will have to spring it up stiffer to reduce the variance.

I have run so many track sessions testing our shocks that I can confirm that when we run 700 fronts and 600 rear we have a fine handling car, that is capable of running World Challenge lap times. The stock wheel rate in the rear will actually lower your rear spring rate by 55% at one point in the wheel travel then even lower as the car travels further.

If the car has wings, and front splitter, you must raise the springs rates to 850 front, 750 rear. Again, we have tested this time and time again.


I will try the 700 fronts and 600 rear and have my Ohlins shocks rebuilt to match the new springrates this summer.

0Randy@DRM

Anders,
Make sure your shocks can handle the extra spring rate.

Randy

XPC5R

I use 700f, 600r on mine. My shock geometry is closer to stock than LG's. This setup works well for bars like the Hotchkis ones.

When running T1 bars, I have to up the rear spring rate (600f, 700r) to balance the car against that big front bar.