R32 Gtr Spring Rates?

[threetwo]

Hey all,

Im after a set of spring rates that would be suited to a predominately street-based BNR32, that will also take in the odd track day.

They cannot be too hard for the street, but have to be hard enough for track duties.

Any help would be excellent.

cheers

threetwo

[Mr. Keets]

Welcome 32.

5 Kg/mm Front, 4Kg/mm Rear would give a reasonable street ride. Some will say more but thats what I've got and i'm happy with that for the street. Check out the suspension threads there is alot of good reading on this subject and have a look at Sydney Kids Bilstien Group Buy for an indication of whats available and necessary.

[threetwo]

Thanks mate.

I know there is a suspension thread, but would there be something more specific to spring rates, or would I have to search through?

[Mr. Keets]

I cant recall exactly when this was discussed, but there are a number of threads that start out as "what kind of shocks/springs do I need" and generally progress to a healthy debate re pros and cons of different brands, valving, spring rates, ride heights and camber

If your keen on acquiring the knowledge I'd recommend working your way back through the threads. Heres one to get you started

[Sydneykid]

Hey all,

Im after a set of spring rates that would be suited to a predominately street-based BNR32, that will also take in the odd track day.

They cannot be too hard for the street, but have to be hard enough for track duties.

Any help would be excellent.

cheers

threetwo

My suggestion (as always) would be to use spring rates at the lower end of the scale and have adjustable swaybars so that you can tune the handling balance when you go to the track. Exactly what spring rates to choose depends on the type of tyre you are to run. A typical road tyre, say a 255/40/17, won't like spring rates much over 275 lbs/inch (5kg/mm) in the front and 225 lbs/inch (4kg/mm) in the rear. An "R" type tyre will tolerate slighhly higher spring rates, up ot a max around 400 lbs/inch (7kg/mm) in the front and 275 lbs/inch (5kg/mm) in the rear. For a full slick I wouldn't be looking over 700 lbs/inch (12.5kg/mm) in the front which is what we run in the V8SuperCars.

Keep in mind that if you are using a lower profile, say 18" or 19" tyre then you will need to reduce the spring rates accordingly.

Cheers

Gary