SwampWS6

iTrader: (7)

So I currently have front Viking coilovers on my 97 Turbo Trans Am and DA viking shocks in the rear. I am more concerned with my 60ft than the comfort of street driving. My front spring rate is 350lbs because of the turbo setup. I chose 150lbs springs for rear. Good choice? I do have weight reductions as well.

UMI Sales

iTrader: (1)

Have you ran the car with this set-up yet?

The 350lb front is street/strip general rate.
The 150lb rear rate is an auto-X/road race based rate.

Craig

SwampWS6

iTrader: (7)

Well I thought it'd make sense because I would have more front end weight due to the FMIC and turbo. I didnt want to choose 275 or 300 because I didnt want it to sag in rear. So, should I have 125 spring rate for a drag setup in the rear?

UMI Sales

iTrader: (1)

That was just a generalization for the rates.
Some guys run soft spring/stiff bar, some stiff spring/soft bar on the rear.

The best thing to do is run it and make changes from there.

Craig

BMR Sales2

iTrader: (40)

150 is a normal middle of the road option for a street/strip oriented car. I normally go in the 175/200 range on a handling based car, or down to 125 on a super light drag only car. These cars are pretty sensitive to spring rate changes in the back, so you don't want to make too big of jumps. This is also contingent on total curb weight and desired ride height. It's going to be hard to tell really if the spring rate is off until some hits are made to see how the car responds

SwampWS6

iTrader: (7)

Ok thanks. That makes sense. I'll stick with the 150s since its not a fully "clapped-out" f body yet....

ssvert99

iTrader: (26)

Depends on if a 12" or 14" spring is being used and then the actual weight split on the car. We offer a 138 rate if you want to go middle of the road.

SwampWS6

iTrader: (7)

How do you decide which length of spring is better for what setup? Some f bodies have 12" springs while others have 15" springs. Is there a theory behind this? I am just fishing for information.

Slo_WS6

I would like to know this as well. I street race the car on asphalt so I need all the weight transfer I can get. 250 shot Nitrous car, M6, with about 150 pounds gone off the nose, soon to be 200 pounds gone. Thinking 275# for spring rates up front, viking coil overs but unsure on spring length. This is to hook on non- prepped roads, not the track, but this is a race car.

Might go big turbo in the future though...