Does anyone know the starting spring rates for the s-tune suspension. I know the final rates are 448/504. But hopefully someone knows the initial starting rates, since they have been out so long, maybe some track or autocross guys have had them tested.

Thanks

 

Front 393*-448

Rear 254*-504

*Estimate. Done only when I have good enough pics of a spring and when the final spring rate is known factor.
Rear example, 3 active coils, .475 wire diameter and 5" OD = 509lbs rate, add in number of progressive coils present so the active coil count is 6, = 254lbs

BUT, their is a wild card. If any coil binds on install, the initial effective rate goes up. The front only have one coil to bind, which is why the differance betweeen initial and final is so low, it's simply not a factor.

Since I went to the bother of doing this, I'm going to include the numbers in specs I keep on hand.

 

thanks. Now how does that differ from like the progressive espelir springs.
http://www.aspecproducts.net/espesg055.html

thanks for all your knowledge. Its alot to understand suspensions.

 

Espelir 350Z progressive springs .4"/.4" drop
Spring rates
Front 258*-386
Rear 281*-515


*estimated numbers, same method mentioned in my post above

When I ran a search here to find pictures of the springs, it was interesting to see how many guys that bought them because of the spring rates, ended up pulling them and reselling them in the end.

 

How would you rate the shock/spring set ups? So just looking at some of the info on true choice and your info. It appears that it would be hard to beat the Nismo s-tune suspenison with any bolt on shock/spring set up. considering the nismo is already tuned accordingly. However, you could do better with a coilover system... I could be wrong, but it is beginning to look that way.