That's one track day from new?

38psi hot or 38psi before you went out for the session?

 

Thanks. I will try night pressures on my second set. I'll add that left had sweeper into the Roval at autoclub is pretty harsh on tires.

 

That pretty much tells you right there. Camber is only ~25% of the equation if you are folding over and cooking the edge. I think last I ran those I was only at -2.8 and never saw that outter wear, and that was mostly Sebring which is concrete and roval at Homestead. So If you're in the 3500 range with you and fuel then i'd look at 44 hot all around, every 200lbs from that drop a psi. That was about the time I had whomever would help start doing temps and pressures hot after morning practices to find where I needed to be. As such I tend not to run "even" camber settings anymore because the data tells differently.

Also if you have gopro's set them up looking at your front tires so you can see them folding over - esp in AX's where you can recover said camera if it decides to come loose. We've MIA'd several that way lol.

 

38 "hot", one cool down lap at the end of the session and then checking pressures as soon as I got out of the car.

 

Good to know. I forgot to take my temp gun to the track so I could check temps.

And I got a GoPro aimed at the LF for the last session. It didn't record anything. Which really pissed me off because it would have got the wheel coming off...lol

 

So is that one track day from new?

I've found 36-37 hot is better on 10.5 wheel with -3.2. Tire isnt even to the arrow yet. 44 is redonk, the car would be like on ice. Even 40 hot the tires get pushy.

 

am i wrong by adjusting air pressure until i am wearing chalk down to the triangle marks on the tire?

 

Yes, one track day from new. The right front looks better. And the rears look significantly better.

No 10.5 wheels here. 17x9.5 with 255/40r17. Although, the tire is very square. I feel like it could go on a 17x10 no problem.

And I agree, 44 hot seems like a lot. First session the car came in at 42 hot all around. I picked a lot of grip dropping pressure. But if it makes the tire last longer, I might be ok with it. Also, at 42 hot, the tire wasn't wearing to the edge. I settled on 38 because that got the tire to wear right to edge of tread.

 

What does the right rear look like? because that front is kind of crazy for one track event from new.

I think this is mainly SOW and how hard it is on tires.

 

I'll take pics of all 4 tires when I get home today. The fronts are worn more on the inside and outside edges that the center, indicating under inflation. The rears don't look too bad.


The shop that helps me with chassis setup (H1Performance, Eladio) did tell me that SOW is a terrible track for tire data because it's narrow with tighter corners, and the surface sucks. They don't take tire date from SOW to any other track. I still think its a bit of an outlier that the fronts wore this bad. I think I wasn't running enough front pressure now that it has been brought to my attention.

 

Lol

 

Edit

 

Hey Sean

Shoulder wear is not necessarily low pressure. Inside & outside shoulder wear is another indicator of aggressive road coarse driving

http://www.dunloptyres.co.za/Tyre-Care/Shoulder-Wear

In my job we are involved in the beginning stages of tire wear diagnosis before we turn it over to the tire pro's. In my industry, inside & outside shoulder wear is due to high tire pressure causing the shoulders to skip on the road due to over inflation

Joe

 

Starting to tear it all down to get new pieces in. Anyone know how much the WL Part #: KCA400M ALK moves the wheel forward?

I am semi counting on it for the new 10.5 NT03s

 

Yes, the wheel gets moved forward a bit. I have the perrin PSRS and the tire is too far forward, it rubs the front of the liner (chewed them up pretty bad), and almost rubs the bumper, but has a solid 2 fingers of clearance in the rear. I plan on getting Ciro caster plates to try and get it more centered in the wheel well. The whiteline doesn't move the tire as much, so you should be fine.


I didn't have time to get over to the shop and take pics of my tires last night.