Rode in a 426hp 4th gen camaro

[FestYboy]

Funny thing is the car has neg camber and that's the outside edge. Oops. Lol

Oh I know but I can't recall how many times I've had to correct other mechanics/customers when they declare that a car has camber wear when in fact it's toe wear.

That pic just goes to show how much side loading and deflection tires can see when they are pushed.

[Dragonhealer]

For this test the front camber was set to 1.7°negative, 1/32 total toe in. The right front is quite worn also, but the wear is almost even.
Tyres went on the car October 2016.

[Advancedynamix]

Funny thing is the car has neg camber and that's the outside edge. Oops. Lol

[FestYboy]

"That's something serious camber wear, bro" :p

[Advancedynamix]

Ryal texted me the picture so I could post it. This is the left front, which is the load bearing corner of a clockwise track (like the one we tested at). I had the car sliding on 3 wheels at near 75mph on 145mm tires. After 5 laps of that the poor little tires would never be the same.

[Dragonhealer]

Yes, Charlie ran Ethel on the Yokohama 12's, only 12 inch we have found that works. I was delighted when they went back in production.
Put a set on Jim Anderson's (God)'s car, still perfect!

Wish I could show a pic of the front tyres on Ethel.

[Team Lightning]

The Yokos were the best 12" I ever had on it. I bought several brands until I changed it to 13's. I only found Yokohama's one other time over the years. Kelly-Springfields were among the worst. Had to be balanced every oil change. (3000 miles)

[Advancedynamix]

I think that Ryal had Yokahama 145s on Ethel that day. All my Festivas have come with garbage 12" tires, so that was the first time I was able to try a half way decent set of 12's (even though they were quite old, at least they were round.)

[Team Lightning]

The factory Yokohama 145/12's handled very good in the mountains. I gave several Mustangs more than they wanted in the curves. Basically, I was faster in the curves but the V8 in the GT would get me in the straights. Just wish I knew then what I know now.

[Advancedynamix]

I rather doubt the 145s were driven in the same manner once the new suspension was installed... I suspect once it was sorted, the loading on those 145s went through the roof. And the added heat generated would aversely affect the tread wear.

Not saying you drove (or thought you did) any differently, but the reality is it wasn't just the suspension that changed.

Too many damn variables!!! Lol

I may have had something to do with the accelerated tire wear. Lol. He told me to test it. I had never tried a decent set of 12" tires with the coilovers, and I had an open test track all to myself (well except for Carolyn driving Pedro and a brand new Viper ACR.)
I can say that the 12's weren't as bad as I thought they would be. I had fun lightly sliding Ethel on the little tires, but I came in after 5 or 6 laps. Carolyn wasn't real happy that I was testing our theories in her daily driver. She's way too nice to us.

[Dragonhealer]

Oops.
You want to start on the safe side, and not muddy results with over heated tyres.
Road course: start with 36psi cold all 4, check immediately off track, adjust to achieve 40psi hot all the way around, you will have to adjust this each time. Note how the car handles, look at the roll-over marks, should be no wear on the marks, just up to is about right.
Be aware the rear tyres will take longer to get hot as there is less weight on them!!!
If the car is pushing, raise the rear 2 psi at a time till it feels neutral or slightly loose. If the car feels loose at 40 psi all around, something is wrong.
Auto cross: this one is all trial and error, and the tyres change the whole run. Try 28psi cold and raise the pressure in 2 psi increments on the axle that has too much grip (please share results) It is also possible to reduce pressure of the tyres on the axle with the least grip, but advise against going lower than 26 psi on the front at your power level.
Drag racing: someone else will have to advise!

Mike, there is more to this, but this will get you in the ball park fast so you will be having fun! Share your results and we can fine tune

[FestYboy]

Also, we need to smack all our heads together and get a recorded teleconference going... There's just too much info to write down once the juices get flowing.

[FestYboy]

I rather doubt the 145s were driven in the same manner once the new suspension was installed... I suspect once it was sorted, the loading on those 145s went through the roof. And the added heat generated would aversely affect the tread wear.

Not saying you drove (or thought you did) any differently, but the reality is it wasn't just the suspension that changed.

Too many damn variables!!! Lol

[Dragonhealer]

Wow, there is a whole book worth for that, but the process is straight forward :

[mikemounlio]

SO i will be racing this summer in overkill. How do i go about adjusting my tire psi? I will be on my federal 595 185 60 13 on my rims that are 6" wide. I will have to stay with this combo for a while at least so please dont just say get a different rim or tire!

Is it all by temp, roll of the tire or by feel or a combo of all? I am new to racing so ill be full of excitement. I wont really be able to feel anything i bet

I have seen the shoe polish on the tire and do a hard turn. look at the polish and adjust pressure. What am i looking for?