2010 Base Coupe LT3 w/F55
The original Goodyears have been replaced after 22k miles. Rears had 6/32nds remaining, fronts 2/32nds with the inside 3” unreasonably worn beyond nothing. I bought the car with 7k miles 2 years ago. The previous owner reduced the front ride height to 26.5” ~ I increased to 27” (spec 27.4”) just before getting the new shoes. Rear is factory spec at 28.7” The car has never been tracked.

These are the Pfadt street specs I asked for and the actual before/after specs on the alignment I just had done. Opinions would be appreciated ~ is the positive front toe-in an issue or not significant?

 

Your front toe of +0.07 and +0.08 is so little from the ideal of 0.0 that it's insignificant.

 

OK, but Pfadt specs become increasingly negative for more aggressive driving, nothing above 0°. Any thoughts on what caused the premature wear on the inside of the fronts?

 

Excessive negative camber is what causes tire wear to the inside area of the tire.

 

I think with the increased front camber and the higher toe you are gonna see poor wear for sure.

Try and get the total toe under.05 at the max especially with the increased camber above .6.

The rear looks fine.

 

Want some specs that are sure not to cause tire wear:

Camber (Front and Rear): -0.3

Toe (Front and Rear): 0.0

Caster is non-adjustable, so don't worry about that

 

Question...why the Pfadt specs? Reason I'm asking, I just got my Base '05 done be a very well respected area alignment shop, they do all performance and hi-end cars. I asked for the Pfadt specs and he said he would do it if I wanted but kind of talked me out of it, saying those specs leave the car "loose", he was sure I'd be bringing the car back. He showed me the Pfadt specs and the OEM specs and they are pretty close so I went with OEM. I have over 15K miles on my Michelin A/S Run Flats and they still look like new with the OEM specs from the last alignment so I stuck with them...YMMV of course!

 

There different sheets/specs for PFadt alignments.


There is the street spec for people that will not push the cars hard, and this is to prevent the normal inner tire wear when the car is not pushed hard to wear the outer side of the tires as well.

There is the normal'ish OEM alignment, and if the car is driven hard enough, you end up with even tire wear, since when pushing the car hard, the outer tire part is worn at the same rate as the inners .

Then Pfadt has a starting point alignments for track use. Its just a starting point, since depending on the track, will need to tweak the alignment to get the best traction for that track. With this alignment, and the car not push at all, the inner wear on the tires is going to quick instead.

Bottom line, your normal driving style will dictate which alignment you should run with.

If your driving style has the tires wearing evenly with the OEM alignment, then stay with it. If your inner tires are wearing faster than the outer since your not pushing the car enough, then would be better with a Pfadt street alignment instead.

As for the Pfadt track alignment, it a good starting point for most tracks, but as stated, all depends on the track you are running, and would need to tweak that alignment for that track to perfect it instead.

http://www.pfadtracing.com/blog/wp-c...-alignment.pdf

 

My front tires were showing excessive wear on the inner section of both driver and passenger sides.
Luckily for me, I was due for a new set of tires, and that tire wear only happened in the last 3-4 months prior to putting the car up for winter hibernation.

These tires were on the car for about 4 years, with no abnormal wear on either front or back. Why all of a sudden, it started to wear on the insides was maybe due to hitting a few potholes, and those irregular transitions on road resurfacing on the Interstate highways between the old grooved pavement and the new pavement. I know I hit a few of those at speed with a very loud and menacing bang.

With my new tires, I got an alignment as per a very reputable shop in my area.
These are the before and after data.

 

One think I have done with both of my C6's (the 06 had Pfadt Coilovers) is to take a marker and mark the alignment cam. Then when I am under the car I can check the status of the alignment.