R33 Race Car Spring Rates.

[tarmac]

what rates suggest for a r33 , whiteline front rear sway bars, 350hp, locked subframe, caster arms and 52mm piston monotube coil over.s

have been suggest 12/8 but thinking this abit firm?

[zebra]

GTR or GTS?

I run 6f 4r in mine and find its a little soft in the front

[Kaido_RR]

what rates suggest for a r33 , whiteline front rear sway bars, 350hp, locked subframe, caster arms and 52mm piston monotube coil over.s

have been suggest 12/8 but thinking this abit firm?

i run 10/10 in my gts-t, suit my car setup. However i think 12/8 would be a good setup too, 10 in the rear is alittle stiff and tends to make the back end want to slide around abit. so a drop to 8 would help fix that.

[zebra]

That sounds really stiff.

I would hate to try and use those rates on our bumpy tracks

i think 8 at the front and 6 or 7 on the rear as a max....use sway bars to control roll.

Any stiffer than that would make the car impossible to stop or get power to the ground over bumps

[Kaido_RR]

That sounds really stiff.

I would hate to try and use those rates on our bumpy tracks

i think 8 at the front and 6 or 7 on the rear as a max....use sway bars to control roll.

Any stiffer than that would make the car impossible to stop or get power to the ground over bumps

i originally through it was going to be too stiff aswell but the car handles like its on rails. However i do have great controll over both my rebound and damper in my coilover.

[zebra]

How does it go under hard braking over bumps, or running over ripple strips etc.

[MrStabby]

That sounds really stiff.

I would hate to try and use those rates on our bumpy tracks

i think 8 at the front and 6 or 7 on the rear as a max....use sway bars to control roll.

Any stiffer than that would make the car impossible to stop or get power to the ground over bumps

+1. I had 10fr 8.5rr and it was too stiff.

[Duncan]

sounds way too stiff to me. what tracks or do you mean for tarmac rally?

[Kaido_RR]

How does it go under hard braking over bumps, or running over ripple strips etc.

no issue that car handles likes it on rails. Perth race track was recently resurface so its not bumpy at all and even riding or going over the ripple strips the car still holds traction

[Roy]

If you are running 16 x 6" re-treads then 4F & 2R woudl do the job. If running good road tyres then 4F & 2R may be ok. If you are running good quality shocks (what brand is the 52mm monotube shock) and semi slicks then ?????, if you are running slicks???? I think you are better of being softer then harder especially if its rwd.

Without knowing if the car is full weigh, lightened. GTS or GTR, tyres it is running. What sort of events etc then you cant really expect to get good feddback. If you can answer then someone may be able to help...lol not me but someone

[tarmac]

If you are running 16 x 6" re-treads then 4F & 2R woudl do the job. If running good road tyres then 4F & 2R may be ok. If you are running good quality shocks (what brand is the 52mm monotube shock) and semi slicks then ?????, if you are running slicks???? I think you are better of being softer then harder especially if its rwd.

Without knowing if the car is full weigh, lightened. GTS or GTR, tyres it is running. What sort of events etc then you cant really expect to get good feddback. If you can answer then someone may be able to help...lol not me but someone

Thanks for the replies guys.

To make it abit clear

Im running ISC N1 coil over suspension, 17x9.5 inch rear tyres, 17x8 front tyres. Will be running both slicks and semi slicks.

Its a GTS25t R33 rb25det, full roll cage, around 300hp. Car is stripped interior. Has caster arms, locked hicas, locked subframe, lsd.

[djr81]

17x9.5 inch rear tyres, 17x8 front tyres.

Assuming the tyre widths are proportional to rim widths then you will be enjoying bulk understeer.

So maybe fix that before getting too far into spring and shocks & buying tyres.

For my ten cents on the the rates if you are on R comps then the kg/mm number should be in the single digits and the front harder than the rear. Just don't get sucked into thinking that a bigger number = better. Doesn't necessarily work like that for springs.

[Kaido_RR]

Thanks for the replies guys.

To make it abit clear

Im running ISC N1 coil over suspension, 17x9.5 inch rear tyres, 17x8 front tyres. Will be running both slicks and semi slicks.

Its a GTS25t R33 rb25det, full roll cage, around 300hp. Car is stripped interior. Has caster arms, locked hicas, locked subframe, lsd.

Try 12/10 or 10/8 and see how you like it, spring are easy to change on coilovers and relatively cheap.

With my setup i find 10/10 to be good starting point but i can see the need in the future to upgrade the front spring rate to 12.

I have a very balance setup no understeer or oversteer.

When looking into my suspension setup it was extremmly hard to get any information on setup, and what parts to use and not use. I found that generally on sau people dont like big spring rate. Compare to what track car run in Japan and Europe.

I guess it depends what works for you and your setup.

Are you running stock swaybar? what is your allignment setup? (camber, castor, toe?)

[Roy]

Dont run 12/10....you have to admit you are in the minority for liking so much spring in a GTSt

Its as much about the quality of the shocks and its ability to control the spring. No offence to ISC N1s, just like many other shocks for the money would not handle such high spring rates well or or long without boiling the fluid in them...assumign they work with the rate in the first place.

I would personally work in the 8/6 range myself, max. Thats assuming you like a stiffly sprung car

[Kaido_RR]

Dont run 12/10....you have to admit you are in the minority for liking so much spring in a GTSt

Its as much about the quality of the shocks and its ability to control the spring. No offence to ISC N1s, just like many other shocks for the money would not handle such high spring rates well or or long without boiling the fluid in them...assumign they work with the rate in the first place.

I would personally work in the 8/6 range myself, max. Thats assuming you like a stiffly sprung car

i guess but i like it like that

i do agree that the quality of the shock is important, no idea what the ISC N1 are like and if they are only damper or rebound and damper adjustable.