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      12-20-2013, 12:47 AM   #52
DallasBoosted
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Drives: '08 E92 335i
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2008 BMW 335i  [5.00]
Quote:
Originally Posted by ashmostro
Quote:
Originally Posted by TC Kline Racing View Post
OP, you have a nice looking set-up here. I would say your rear spring rate is 'spot on' but the fronts may be a little stiff. You may experience a 'pitching motion' when you go over bumps, like the car is wanting to rock back and forth and when you are at the limit, you will be more likely to have understeer with that stiff of a spring. Typically (for our suspension) the sweet spot for the front spring is anywhere between 300-400# front springs (even for taking the car to the track or autocross).

Not saying that your set-up is wrong, but it may be worth trying if have the opportunity
Agreed 100% with this. My 450 fronts might be 50# too stiff on my setup as I get slight pitching even with the heavy 800# rears. The front ends on our cars have a narrow sweet spot, IME.
My car definitely does generally understeer with these spring rates. I am going up to 800# rears next month and might drop down to 425 fronts after I see how the rear springs do.