Clio williams standard front spring rate?

[Adi82]

Anybody know the spring rate for the clio williams standard front springs?

[richy]

125lb iirc i think mark ritchspeed had a set tested many moons ago and they came out at that.

[Richardcard1974]

I'd agree with 125 lbs.

[Adi82]

I'm guessing thats 125lbs/inch?

Trying to calculate the correct torsion bar thickness I want on the rear to work well with my H&R coilovers.

So far i know the H&R's have 60N/mm main springs with a 45N/mm helper spring.

So forgetting the helper spring they would be 342lbs/in front springs. Now I need to go and work out the torsional spring rate of the stanard rear beam and corner weight my car.

Not done this maths stuff for quite some time!!!

[MAXIBOY]

let us know the figures you come up with..

beanie corner weighted his the other day..but his is very light..

thread of clio16valver

[richy]

yes thats 125lb/inch

iirc the KW kits also come with 340lb/in main springs too, i dont think theres a great deal of choice when it comes to the rear bars, reichhard motorsport(germany) used to supply some both torsion and arb bars in a few sizes, other then that might be looking at different renault models like r5 extra van etc etc

[MAXIBOY]

yeah rod can have them made to spec..

[Adi82]

Yeah once I have the corner weights and dimensions I need I will calculate the torsion and anti roll bar sizes that I want and then see if Rod can get them machined up for me. Only thing that might be a problem is the material needs to be the same as the Renault items to compare like for like bar diameters.

[MAXIBOY]

not if you know the spring rates.. :D

[Adi82]

Part of the calculation for the torsion bar equivalent spring rate looks into the young's modulus of the material. However if I know what spring rate I want from the torsion bar and I know the modulus of the material that Rod can use then I can work out the thickness required.