Car is primarily street driven so I can't be wearing out the inside edges of my tires every 5000 miles. I run 3-5 HPDE's a year, maybe 1-2 more next year. I haven't had the car properly allighned after lowering it and want to get it done perfeclty. I'll be taking the car over to Eurosport here in Va Beach (they run GT3 cup Porsches) to get it done... Need some specs for them. Should I use stock specs or go a bit more agressive?
You can go a little more aggressive but tire wear will be increased, especially on the inside shoulders. Of course if you track the car tire wear will be greatly increased.
That said here are some good all-around specs assuming street tires.
Front:
Camber -1.3
Caster: As much positive caster as you can get without sacrificing camber while keeping camber equal on each side. Caster should be equal as well.
Brian,
Alignment specs, like most everything else on a car, are a trade off. There is no best answer for every situation.
I like No Doubts specs for a mix between street/track. More negative camber and a slight toe out up front will help reduce understeer, while sacrificing tire wear.
As a data point for you, I had my stock alignment changed to -1.75 camber in front with zero toe and wore out my stock F1 SCs in 3k miles, which included two DE days at Roebling Road. Insides wore out on both fronts.
I got about 10k out of a set of Kumho Ecsta MX with the same alignment, but only one DE day.
from my s2000 days racer rubber seems to like more camber, like at least -2*, otherwise outside edge wears out after just a few track days.
Also -1.75* up front is that doable with stock suspension or does it require camber plates? in general at what point does one need camber plates, i.e. what's the max negative camber stock suspension is cabable of?
If you lower the car about an inch (stock rear bolts and no bushings cut in front), I could just get to -1.75 front on the stock suspension without camber plates.
My stock setup was about -1.1 rear, limited by LR which was as negative as I could get it.
I think, if you don't have too much toe out, you should be able to get away with -1.25 to -1.50 without excessive wear of the inside of the tires. Toe out is the killer!
I'm running -1.5 camber, +8.0 left/+8.5 right caster, and very nominal (-0.03) toe out up front.
The rear is kind of interesting, in that my buddy/tech (who has set up all types of race cars, including IRS Corvettes) urged me to try a very different take on camber, running only -0.60 to maximize footprint and forward bite. Toe in is +0.06. This also gives less lateral grip in back, less understeer tendency, I'm thinking.
Tire wear is too early to judge, I've only done about 1500 miles on the street tires. On the performance side, the car is pretty neutral and I've been able to do well in the autocrosses I've run since buying the car a couple of months ago and it worked well in the one open track day I've done, although the outsides of the Kumho V710s I'm running took a little more abuse than I'd like...good news is, I can flip 'em eventually.
Last edited by tigerdrvr : 11-17-2004 at 09:57 PM.
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