So the car is a MY05 sitting on BC Racing BR type coiolvers with 12k front 10k rear springs with whiteline non adjustable front sway and will be wearing 17x9 RPF1s on all four corners with 255 Nitto nt05 tires. What do you think of these alignment settings I am going to use? The track is mainly slower but very sharp cornering with not much in the way of high speed cornering. Looking for good turn in response but trying to keep the rear end tame. Would I notice much difference between -2.5 and -2.8 front camber? Hopefully this will give me great balance but will be easy on tires for the most part. I am thinking about 1/4" is the most I can go on rear toe and still conserve tires.

Front:

camber -2.5 or -2.8
Caster Max
Toe 0

Rear Camber -3.0
Toe 1/4" TOTAL toe IN

 

id personally go less toe in on the rear for high speed stability on the street , if you want turn in response i would toe out the front a tad but that will chew tires.
on the camber i hope your tech is really good ,..i normally tell them to get the front as negative as they can and then match the rear to exact what they got out of the front.

 

Thanks for the comment. My buddy is running the same tire set up and says its stable with the 1/4" toe. Hopefully he is right. The guy I take it to usually does a good job and gets what we ask of him. Yeah don't really want to chew up the front tires so I think I will stay at 0 toe I guess.

 

......... rear toe-in increases rear stability

 

Your setup sounds like it will understeer quite a bit at low speed. It will have much higher roll stiffness in the front from the stiffer front springs and the much stiffer front bar. I would go with less toe in the rear, esp. since you have an AP2, somewhere between 1/8 to 1/16 total toe in. I'd start with 1/8 and move to 1/16 if you feel like you're still not getting enough rotation out of the car. You should also go with -2.8 camber in the front vs. -2.5. I personally don't like the NT05's--they don't have very much lateral grip, overheat quickly, and generally are not a very consistent tire. I suggest you try a different tire after these are done (Hankook RS3 or Dunlop Z1 Star Spec).

 

i dont know if thats a question or a comment....
anyways i found(as with many others, which is how i fixed it,...by listening to what others did) is that toe in on the rear causes the car to be twitchy at high speeds.
I use to run 1/4in toe in and anything about 80mph the car felt like it was floating.
zeroed the toe and its way more stable

 

^ Your avatar pic is exactly what I am doing right now as I read your post.

 

^ I wish I could "like" the post above me! haha

 

Thanks for the very informative info! I will do the 2.8 front for sure. I would love to get something other than the NT05s but they are about the best I can get in my price range and still get decent treadlife. I thought about RS3 but heard they wear much faster than the nt05 and they always seem backordered. I am ope n to suggestions on nt05 alternatives and have a thread in the tire and wheel forum. I may only get to do 3-4 track days this year. My enlistment in the military is up next spring so gotta save money.

The reason I was thinking 1/4" toe in was because my buddy who is also on here runs that with great results. I was kind of looking for more understeer simply because the car (with staggered setup) had a very big tendency to whip out the tail

 

Yes there is a noticeable difference between 2.5 and 2.8

I think your plan sounds like a great starting point.