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Originally Posted by pacfwu
Well I've still got them, but it's not as though I've run tests on them. The spring rates are 35% stronger than stock. So I think I figured them out to be somewhere in the neighborhood of 7kg(f)/10kg(r). It was awhile ago, so I could be mistaken. The main difference is going to be the valving in the shocks. That's where your x-factor is going to be. And short of someone sending them out to be reverse engineered, this is probably going to remain an unknown.
Tokico builds them.
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Oem spring rates are as follows
2003/2004
314/342 (wheel rate 149/144
2004.5/2007 (should be the same for 2008)
314/427 (wheel rate 149/180
S-tune shock/spring kit
448/504 (progressive springs, especially in rear)
(wheel rate 212/212)
Nismo Z (using +35%, if accurate)
424/576 (rear progressive, but front spring is the same linear style as other oem springs, though all have a slight taper in outside diameter that will lend a slight amount of progressive spring rate)
(wheel rate 201/273)
If anyone want's to know the spring rates on the Nismo Z and is willing to send me a single front and rear spring, I will get the community the rates. Springs will be shipped back within 48hrs of receipt at my expence. Some of the oem rate data that we have came from members doing just that.
If a single Nsimo Z front shock and rear shock were to also be shipped to me I will provide a shock dyno at my expence, though keep in mind that the turn around time will not be 48hrs, likely 7-10 day's before they would be dropped off with Fedex ground. I have oem 2003 shocks waiting to be dyno'd as well as Koni yellows. Hoping to dyno several others as well.