Originally Posted by TC Kline Racing
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
Going to the racetrack next weekend, so I will have more of a report as to how these spring rates work then. Its actually surprisingly "not bad" on the street. Wife didn't even complain about it.
Thanks for the feedback.