R32 Gtr Time Attack Suspension Setup

[emilio_bro]

But wouldn't it need a smaller rear sway bar in this current problem to make it less stuff and gain more traction?

[djr81]

IMHO no. There are different causes of understeer/oversteer, not all of which can be tuned out by adjusting front to rear roll stiffness/weight transfer.

Question: What are the coils spring rates? Also - are you trail braking into corners?

In anycase you should match your sway bars to your spring rates. Soft arb's and stiff springs are not a nice combination.

For what it is worth my heap of sht has turn in oversteer in the wet but not in the dry. Why? Because of the massive rear anti roll stiffness needed to reduce understeer in the dry. But also it has no grip in the wet because of the camber it runs - which is matched to a dry track.

The whole of the answer is you need to address the lack of anti roll stiffness then your camber settings. In that order.

[emilio_bro]

My spring rates are 7kg fronts 7kg rears. I don't trial brake into corners no.

I think we are kinda missing the point. My car use to under steer. Mainly push under steer which is probably really normal in a gtr. So I took it to "Acurate suspension" got a corner balance and told him my issue so he basically maxed out my front castor and front camber to -4.5. I certainly don't experience any under steer now but I just have an imense amount of oversteer. Question is. Will having that much front grip induce heaps of oversteer ??

[djr81]

Do you mean by push understeer it pushed when you put the power down? If so the change is due to the stiffer spring rates and the smaller amount of weight transference under power.

[XKLABA]

Why did you put the same springs front and back given the R32 GTR is so off balance to start with, iirc when we corner weighted my 32 it was 900-/+ kgs front and 500-/+ kgs rear so you would want softer springs on the back

[djr81]

You do it to reduce understeer.

[GTSBoy]

Yuh,

Unlike RWD Skylines where you'll generally run a couple kg/mm more spring on the front, a lot of GTRs are set up even or slightly stiffer in the rear. It sounds retarded, but you do what you have to do.

Personally though I would try to set up a GTR so you didn't have to do that. Haven't tried, so not sure how much traction (get it? traction! I slay myself!) you'd get with a more conventional setup.

[djr81]

You get more traction with a more compliant rear spring rate. However it doesnt help you because you cant accelerate the car if you cant turn the corner in the first place. Plus with an attessa modifier gizmo you can put more torque forward and fix the problem anyway.

[Duncan]

Lots of good advice from experienced track-ers here, great to see.

Personally I run 4.5o caster, 2.5o camber and 1mm toe out front, and 1.5o camber and 0mm toe rear. It gives a little oversteer on turn in under braking in tight corners but that is my preference. A little rear toe in eg 1mm should stop that too. I would definitely get bigger sway bars both ends too, it makes a big difference (keep the car flat, keeps more tyre on the road to a point)

If you have that much go you definitely need to put proper semis on it. You may find the original understeer wasn't so bad with better front grip (yes tyres won't change the balance of the car but you may find it was OK already).

I would also get an attessa controller on board, the Ruzic ones from Paul(mountainrunner) up there are the best, but the basic ebay ones will also make a difference. Also depending on the age of the car and xfer case condition, consider getting it rebuilt instead as a controller can only make the most of what the xfer case can manage.