Had a talk with a dude last night about wheel alignments, and he had some different ideas to me about what worked best. Thought I'd use this as motivation to find out what set up people run, and why, whether it be personal preference or something that is proven to work etc.
I'm not entirely happy with the alignment on the GTR at the moment, but thats more to do with the lack of adjustment in the right places more than anything else.
From memory, this is how it's set up at the moment.
Camber: 0 degrees, no adjustment available, so I need some camber arms.
Toe : 2 degrees toe out total, 1 either side. Always preferred the car set up like this, seems to turn in better, but maybe thats just me
Caster : Whatever factory is, maybe around 5 degrees???
Camber: -2.5 degrees or so, again cos I dont have any adjustment
Toe: 1 degree toe in, .5 either side.
Looking at getting front and rear camber arms in order to dial some more camber in on the front and maybe pull some out of the back.
each car is different, and you have to specify what conditions you want it for...
i.e. daily drive, track use, hardcore track use...
if you have a heavier car, i.e. GTR, you want more camber like -2 deg or more... because of the weight transfer to the outer tyres when you corner is more prominent than, say Lotus Elise.
Toe essentially determines the car's will to turn in. Having toe in, will reduce this... it gets very complicated and depends on what car you have. i.e. FWD, RWD, AWD...
i.e. my s2000, stock has 6mm toe in on the rear to reduce its oversteer, but then i upgraded to a heavier front swaybar, so i decreased its total toe in to around 3mm... Now i have to find out how that feels on the track!
anyway, have a read around, maybe specific forums for your car. good luck.
- -2.5 degrees camber
- ~1.5mm toe out (per side, 3mm in total)
- maxed out caster rods (the machine wouldnt read it properly, but the bumper needed cutting
rear isnt adjustable...
In my opinion, run as much caster as you physically can. I have spoken to a few knowledgable people, and the general idea is to stop adding caster when the steering gets too heavy, or you run out of room.
Camber depends on what the car is used for. Ultimately Id set it up for which part of the tire you want to be using. So unless you need the camber for grip around corners, it doesnt really need to be crazy. Unless it helps fitting tires under guards of course.....
Toe in and toe out seems to be a personal preferance. It changes the way the steering feels, and the way the car behaves to the way you turn it. I like mine because it is pretty snappy and direct.
One thing I heard which is interesting about toe...
Imagine a you pushed a wheel along the ground, If you tilted the top to give it positive camber (top outwards), it would automatically steer itself outwards.
If you tilted the top to give it negative camber (top inwards), it would automatically steer itself inwards.
So if youre running crazy camber, both wheels will be basically fighting themselves on the road, and having some toe out might be a good idea...(hope that makes sense)
car turn in is more then enough for me with the addition of the adjustable rear sway hence 0 toe all round
i think i can do with less camber at the rear but i like the ability to control my car slightly better if the back does temp lose its grip
My S15 is getting an alignment next week, will adjust front camber to about -2.0 degree and rear camber to around -1.5 degree. Will set max castor for the front and a little toe out. Car is mainly a weekend car, QLD raceway and Lakeside. Will be interesting to see what changes I will get.