Long story short, I am trying to get a better ride on my 1988 GTA. I have replaced the front (Moog 5660) and rear springs (AcDelco) and replaced the struts/shocks with Koni yellows. I have dialed the as soft as they can be and the car rides rough. I have often heard coil overs don’t help but I talked to QA1 and they claim their new coil overs (Proma Stars) will ride better. Then the next question would be what spring rate? My car is street only so would want a softer spring. I think options are 170, 250 and 350.

 

Lighter springs are usually for lighter cars or drag race. Heavier springs would be for street full weight cats

 

I checked QA1 charts and they recommend a 250 spring rate for the coil over.

I am going to call them and ask about the car that was at the Hot Rod Power Tour to see if I can talk to the guy that owns that car to see what he is using but also to get his thoughts on the ride and adjustability.