Spring rate front/rear ?

[Rka]

M3 CSL OEM spring rate?

/Thanks

[alexk]

The springs are not linear and the front ones are ~ 35Nm

[Rka]

The springs are not linear and the front ones are ~ 35Nm

The reason I ask is that I am trying to find the right hardness of springs for a new set of coilovers.
CSL std. setup is a little soft in my opinion. I was going to go on a little harder setup. 35Nm seems difficult to start from. Coilovers as Intrax and Nitron recommend 100-110nm front and 60 rear (real coilovers)

I have 140/160Nm on my Bilstein coilovers. The set up work, but has been a bit hard.

120/60 Is it likely I will start with.

[shimmy]

I've had 100F 50R on my Intrax for 4 years. They are a little too soft for track and a little too hard for road but fine.

I would go 100/50 for road biased car and 120/60 for track biased and 140/70 for race.

I'd guess stock are around 80/40 or 90/45

[Rka]

I've had 100F 50R on my Intrax for 4 years. They are a little too soft for track and a little too hard for road but fine.

I would go 100/50 for road biased car and 120/60 for track biased and 140/70 for race.

I'd guess stock are around 80/40 or 90/45

Thanks for your reply.
Leaning that I start with 120/60, which also you are on.

Drive my car almost only at trackdays.

I've always gone to stiffer springs, but this time it looks like that the curve goes down. Hope the speed goes up ...

[alexk]

I'd guess stock are around 80/40 or 90/45

shimmy the stock ones (front) are definitely 35Nm/mm.
100mm statig SAG with ~700kgs at the front axle is bang on the money 35Nm/mm.