I know spring rates aren't published, but does anyone here know how much stiffer % wise, Pedders are over stock F&R for TC? Just curious.

I found this on stock springs:

The MacPherson strut independent front suspension uses SS-specific gas-charged twin-tube struts; unique steering knuckles with optimized geometry; 27 N/mm linear coil springs with specific damper tuning; stiffer control arm handling and stabilizer bar bushings; and a direct-acting, 24-mm solid stabilizer bar. At the rear, the SS’s semi-trailing twist beam axle uses monotube gas-charged shocks with specific damper tuning, a 24-mm solid stabilizer bar, stiffer axle bushings and multi-rate coil springs (28-40 N/mm). StabiliTrak electronic stability control and traction control are standard

So, fronts are 155lbs/in and rears are 160-228 lbs/in.

*1N/mm=5.71lb/in

Also, found this on GTO from Pedders Web Site. Could give us a *hint*?

 

Mike @ Pedders sent me this, but I don't think he's talking about the primary spring rate. I highly doubt they're 40% higher.

From what John has said, they are not that far from stock, but the rate of change is different.

 

The fronts are still linear? I take it it's the rears that have a rate of change which may be different. When he said 40% that may be at the full compresion?
My impression is that these are at least 25% stiffer and, from what I've seen with other applications, Pedders seems to up the rate anywhere from 30-50%.
Maybe you can test the rates for us?. We already know the stock rate.

 

I'm not gonna test them. I thought about dragging them over to a shop nearby that has a spring rate tester, but honestly, it does me no good. There are no other good options, so there's not much point in it.

There's a good chance that the fronts are progressive. They sure don't look linear. When testing street springs, I would always want measurements from a couple compression points.

 

wangspeed loves pedders springs!

 

That's why I bought em!

 

thats why im buying them!