I need to know the spring rates of the NISMO S-Tune springs. Rear spring rate is primarily what I'm looking for.

 

Nevermind found it. 504lb/in, progressive though so not sure how this rate is arrived at.

 

Nissan has told us the peak rates, which is what they publish. What they do not tell us and most spring makers don't anyhow, is what the softer initial spring rates are. I will say that the front springs at best have one coil that will bind to effect a rate change, so it's inital rate won't be too far behind the front peak rate. Though the rear springs to have several coil's that will bind, not the same story in the rear as far as rate spread goes.

Nismo S-tune (twin tube construction, uses progressive springs, especially in rear)
448/504



G35 sedan 6mt
Koni coilover front 448lbs
Koni shock rear 342lbs
Hotchkis front bar set to med
350EVO rear bar set to med
Crawford plen
Custom TD injen
HF cats
K&N panel
Rogue short shifter
Enkei RPM2
MX 245/40-18 x 4