Mr GTiR said:
Last time i was told that the front needed negative 1.25 camber and the rear negative 1.5 camber. Does this sound correct or what should it be?
Complete cr*p, suspension setup is subjective and dependant on car and driver etc but more camber at the back would give the car even worse understeer.
If you've got the money, take your car to a professional and get the coilovers setup properly through corner weighting the car with you in it (or a passenger as well if you have a navigator/girlfriend etc normally in the car) They will set the height of the springs. Don't go too low, a 40mm drop is quite enough for road use.
Get your tracking done, ideally with 4 wheel alignment. Adjustable top mounts are designed so you can mark up a few preferred settings and quickly adjust them at the track depending on its style and the weather.
A safe setting would be -1deg back, -1.25 deg's front. Get toe setup as Nissan say it should be for a GtiR. There are real advantages to playing with toe to make the car more or less stable on entry or exit from a corner but for road use you'll also get a lot of tyre wear.
Your castor is fixed.
Try to adjust your dampers so they compensate for the springs but don't go to hard. The Fronts should theoretically be about 10% higher than the back as there is more weight to control.
Drive the car for a week or so, is the balance how you like? Some people prefer understeer, others neutral or oversteer.
Though oversteer is very hairy chested, most people can drive fastest with a hint of understeer. Neutral handling is great but does require more delicate control as the front or back end can go on corners so is less predicatable.
To change the balance:
Increasing the difference in camber front to back will reduce understeer. Making them closer will increase it.
Given you have 205's I'd be surprised if you went much past -1.5 deg with -2 as an absolute max for a high speed circuit, your tyres are unlikely to support much psat this unless you went for slicks. Too much camber causes instability on the road and you can't really go cornering at 120mph so a conservative setting can also be the best handling for most road applications.
the best place to setup a car is at a circuit as you can see and feel the tyre wear over the day and adjust the camber accordingly.
there's loads of other stuff you can do like fitting a stiffer rear ARB, loosening your body shell at the front :shock: (Its very stiff/solid at the moment which is a good thing but will the car more prone to understeer and needs to be dialled out threough your suspension)
Also, what kind of driving are you going to do, A drag setup is night and day different to a track setup.
I've written loads of long posts on here as its my pet bug bear. Do a search on my name and see what comes up with handling titles.
Cheers,
Jim
) but can anyone tell me how the car's suspension should be set up?