CT4-V Track alignment for daily driving

[AC2024]

Yes, for sure! I am in a little bit of a challenging period of life regarding free time (2 year old, 6 year old, wife and I both work relatively demanding jobs) so track time will hopefully increase.... some day lol.

 

[leres]

CT5 not 4, but I have mine permanently set up 1.7 in front and 1.5 in rear. It's equally non optimal for both street and track

But it's my daily so I don't want to run street alignment the few days a year that I'm on track, nor do I want to have the harsh(er) ride or tire destroying track alignment on my commute

I've only tracked my C6 Z06 a few times, I have -0.9° camber and 1/16" total toe in the front, -0.5° and 1/16" in the rear. This is with the pilot sport PS2 (run flats) and I get pretty even tire wear.

 

[Kawman]

Remember, our TPC spec tires have a softer rubber than standard 4S tires. It's a blend of the 4S compound and the Cup 2 compound.

With 2 degrees negative camber you will definitely wear out the inside in less that 15K miles. I had about 8K miles before going to -1.8 front and -1.4 rear. Then did 4 track days and the tires were toast by 12K miles with the outsides being more worn more than the insides.

This year will be -2.4 front and -1.8 rear. Bought a second set of wheels and have a set of Michelin slicks ready to go for this season.

I see you are from Mass. I'll be at Palmer July 15th if you want to join. Also Watkins Glen July 4-6 and Lime Rock on I think the 26th if I remember right.

 

[Smott]

Sorry to revive an older thread. Went to get an oil change and notice the inside of the front tires were done-zo. 18k miles on these. Getting new tires asap and wanting to decrease the "track alignment" just a bit. These cars are wild!

 

[Kawman]

That's not from a "track alignment". The whole inner band should be worn down, but your wear is at the extreme edge. It would take something like -4.0 to -5.0 degrees camber to create extreme inner edge wear.

I'm guessing it's like that in one spot, not around the whole tire. Look at the impact mark on the wheel. Look at the missing chuck of rubber from the sidewall, right at the wheel impact mark. Look at the additional cracking in the sidewall around this spot. That tire suffered a massive hit that nearly blew out the inner sidewall. The wheel could be slightly bent and need to be straightened. Funny saying it needs to be straightened, when it would actually need to be put back into a circle.

 

[Smott]

Incorrect @Kawman. I just had the tires replaced, they found no wheel damage at all. The barrel had small rock chips but nothing out of the ordinary. I kept that tire and will bring it to Cadillac when I get my alignment to see if this wear on the inside is normal or excessive.

 

[jbawden]

I see the missing chunk that @Kawman noted. Not disputing your alignment induced wear, but that tire was compromised from whatever caused that damage to the sidewall and rim.

 

[Smott]

I am not disputing there is a chunk missing or that I (or the previous owner) hit a pothole. I am trying to ask about the wear on the inner sidewall of both front tires. Both front tires looked like this, except the other side didnt have that chuck missing. The manager at Discount tire confirmed no damage to either wheels. The fact that both tires where showing bands makes me think this is normal for this car.

 

[Kawman]

Incorrect @Kawman. I just had the tires replaced, they found no wheel damage at all. The barrel had small rock chips but nothing out of the ordinary. I kept that tire and will bring it to Cadillac when I get my alignment to see if this wear on the inside is normal or excessive.

OK, so the wheel didn't get bent. That doesn't change the fact that we are not looking at a wear issue. There is a significant impact mark on the wheel in your photo. There is a huge chuck of rubber missing from the inner sidewall exactly at the impact mark on the wheel in your photo. There are stress cracks visible on the inner sidewall at the impact mark in your photo. We see exposed wire right at the impact mark, but as we look down the tire, around the 4:30 position the exposed wire stops and cord is exposed. As we continue down to the bottom of the tire (6:00 position) the exposed cord is gone and we are back to full rubber. Looking upward from the exposed wire, by the 3:00 position we are back to cord.

That tire has obviously suffered a MASSIVE hit that nearly blew out the inside sidewall. The impact probably damaged the steel belt, which then wore the "hole" in the tire from the inside out, right exactly at the impact mark.


Edit: I wrote this before seeing your latest post. Could you provide more pictures of both tires?

 

[Smott]

Thanks @Kawman for the insight. This is why I posted asking for opinions.

 

[Kawman]

Look for an impact mark on the other wheel. Ya know those changes of road height by a couple of inches when paving is being done. Someone could have come across one of those at a high speed and damaged both tires in the same way simultaneously.