R32 Gtr Track Car

[Super_Dude]

Hey I've got a R32 GTR with plans to hit the track alot in 09. I've already got quite a bit of engine/drivetrain mods but I am turning my attention to the suspension. I'm looking into suspension arms/bushings/pillowball mounts and all that stuff that every company seems to have a different name for (I'm sure I'm not the only confused guy.)

My question is what are the most important arms/bushings to do and what ones can wait till I get alittle more serious. I know SK's groupbuy looks good but I belive thats more of a street setup. I would like as many heim joints as possible and urethane bushings if required. What is a good company to get everything I need from?

Here are my suspension mods this far:

HKS coilovers

Cusco front upper camber arms

Auto select front strut bar

Factory nissan rear strut bar.

R34 wheels with 15mm spacer (18x9 +15 now)

265/35R18 Kuhmo XS

355mm Greddy 6pots front

Stock rear brakes

[Risking]

The most common way to do it is to replace the outer bushes with whiteline or similar and buy a set of adjustable arms which use inner rose joints

For your GTR you need to get at minimum

Adjustable front upper control arms (said you have Cusco)

Adjustable front castor rods

Have the spring rates of your coilovers checked and buy springs if required.

Adjustable rear camber arms

Hicas lock kit of some sort

Preferably pair of adjustable traction arms to adjust out some bump steer

And replace all the bushes you havent superceded with rose joints.

If the budget streches far enough some form of roll center correction spacer.

From those parts you should get a suitable adjustment range that gives you a good starting point.

Just jap can supply all of those parts (minus the roll center kits I think). They have a few different brands and are reasonably priced.

For the bushes you require call Garry at superior suspension.

Dont throw it all in and get a generic wheel allignment. May be fine for a roadie but take it to a good reputable company in your area and have it set-up properly including bump steer measurments and corrections if possible.

That would be my begining point.

[djr81]

Hey I've got a R32 GTR with plans to hit the track alot in 09. I've already got quite a bit of engine/drivetrain mods but I am turning my attention to the suspension. I'm looking into suspension arms/bushings/pillowball mounts and all that stuff that every company seems to have a different name for (I'm sure I'm not the only confused guy.)

My question is what are the most important arms/bushings to do and what ones can wait till I get alittle more serious. I know SK's groupbuy looks good but I belive thats more of a street setup. I would like as many heim joints as possible and urethane bushings if required. What is a good company to get everything I need from?

Here are my suspension mods this far:

HKS coilovers

Cusco front upper camber arms

Auto select front strut bar

Factory nissan rear strut bar.

R34 wheels with 15mm spacer (18x9 +15 now)

265/35R18 Kuhmo XS

355mm Greddy 6pots front

Stock rear brakes

The most important and the most difficult thing to get right on an early GT-R is the front end suspension. There are a number of issues with regard to the geometry when modified for track work (binding, excessive wear etc) and some of these deficiencies are made worse by aftermarket modification.

You should centre your efforts around getting more front end grip & a better balance to try to attempt to alleviate the understeer inherent in the chassis (itself due to poor weight distribution). Corner exit behaviour is largely dictated by the AWD system.

You will need to add sway bars to your list & I would recommend removing the HICAS function. MAKE SURE the ATTESSA is working as designed & is not worn out. I would strongly recommend a ATTESSA computer such as the Ruzik Engineering product.

As for replacing bushes you only really need to do so if they are either shagged or you cannot get the alignment settings you are chasing. Commonly this includes the bushes for the upper rear suspension links as there is very little adjustment from the factory. Wear points are subframe, castor rod & upper front link bushes.

I would also recommend not touching the roll centres unless you absolutely know what you are up to. The roll centre spacers themselves are only only a small, cheap, machined item but they have dramatic affects on the handling of the car. If you keep a reasonable ride height and rake adjustment the roll centres are quite ok unmodified.

Lastly but importantly, due to the inherent compromises in the cars, they need to be driven in a certain manner on the track. Ask locals who can drive (ie not necessarilly your mates, those with the quick times) & get as much practice as you can.