Help - Cup 2 front tires keep cording

[smokinscooters]

I have a 2019 GT350 that has a relatively aggressive alignment for track use. The alignment was done in DFW by a reputable company who regularly works on track cars.

5 months ago I put on Vorshlag camber plates and had them adjust front alignment to -3.2 camber, 0 toe. Rears are -2.4.

I've had no issues with rear wear but the fronts corded in less than 1000 miles. I had them relax the camber to -2.7, thinking the super aggressive camber may be the culprit. I moved the rear tires to the front and they corded in less than 500 miles.

Full transparency...the corded tires were 2019 Cup 2s so I understand they are soft tires. The alignment company suggested that the old tires were the cause for the wear.

Sooooo....I put new tires on and in a couple hundred miles, they are showing significant wear where the other tires corded.

I'm not sure what to do at this point. Anyone run into this before? I can't keep blowing through tires every 1000 miles.

I have FP springs, Vorschlag camber plates, Apex 19x11 all around, 25mm spacers up front. I never had issues until I jumped from -2.7 to -3.2 up front. Going back to -2.7 didn't seem to resolve the issue.

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[Skye]

If the current settings aren't known to cause such extreme wear, my initial thought is try another alignment shop.

Not a dig at the current place, but to confirm the measurements being taken are indeed what the paper says. Maybe its their machine. Maybe it's how they are performing the alignment, something in the setup of their sensors or equipment.

If anything, you get a cold pair of eyes looking at the same problem, using the same standard, maybe shaking something loose.

 

[smokinscooters]

It's difficult to find shops in DFW that do track alignments. Any suggestions?

 

[Skye]

I had several questions for myself and was studying those.

Attached is a 2019 GT350/R alignment reference.

While I cannot assist further, IDK if the following could generate more ideas from others.

https://www.ford.com/support/owner-...SxpnBE6Ox-lWUpkuGsCaODKAxLxJKOp8lHI9eV5V-KAue

 

[11GT50]

Vorshlag is in the Fort Worth area, why not reach out and see if they can help?

 

[sloopy]

I would recommend Bobby Garret's Frame and Alignment, but google says they're temporarily closed. I'm not sure if it's true though.

 

[fiveoboy01]

Vorshlag is in the Fort Worth area, why not reach out and see if they can help?

I'm glad I read before I posted.... This is my suggestion.

That doesn't seem like wear from your camber setting.

 

[GrabberBargeCaptain]

Somebodys alignment machine is off i bet

 

[NightmareMoon]

Yeah that alignment wouldnt do that in 1500 miles but then,
1) how many miles are on the tires total?

get the alignment checked again by a different shop or buy a string kit (or toe plates) and measure it yourself.

toe plates are easy to use and can give you the total toe on either axle just fine in a few seconds. Adjusting it iteratively and getting the front/rear thrust angle right is what takes all the time and tools. String is much more effort but it will give you the thrust angle too. You probably just need plates

3) if you have a bad ball joint or bushing on the front axle, you can tear up that alignment sheet. BTDT. I had a control arm bearing go out and the alignment place didnt notice. Luckily it was pulling to one side and I nagged the shop about it until we found why the alignment and steering were telling different stories. Bad control arms mean you’re getting a lot more toe on the road than you’re going to see static on the machine.

 

[Bullitt_Will]

Try Precision Alignment & Auto in Hurst. DSG performance recommended them to me for an alignment. I’m not gonna name any names, but I had my alignment done on my Mustang at the same shop you went to last summer, and DSG called out that the front tires had too much negative camber.

 

[WItoTX]

It's your toe. Setting it at zero means under hard braking (track time), those tires are actually toed out. Thank Ford for the geometry they designed up front...

It definitely is worth checking ball joints, rubber bushings, etc...for wear. BUT I experienced exactly what you are experiencing when I went to zero toe. Go to the Ford spec, slight toe in.

 

[petronix]

You need more toe in front and rear as illustrated by the alignment specs supplied earlier. Too little toe in will kill the inside edge of the tires, as you are seeing.

A set of toe plates as also suggested are great for diy toe settings and also camber checks, been doing my own for. 25 years with these or strings.

 

[GTP]

You can check and/or adjust your alignment with affordable DIY methods that I use. And they are quite accurate. I never go to an alignment shop anymore.

Multi-part series on DIY methods for measuring and adjusting your car's alignment

 

[NTXChris]

As others have said, it's definitely the toe setting.

I see you're in Plano, and Vorshlag is in Princeton. They should be able to recommend a local shop or two to do an alignment. Terry at Vorshlag is pretty picky about alignment numbers, so anybody he recommends should be pretty competent.

I've used BSP Motorsports (now located in Aubry) in the past and would highly recommend them. They're familiar with the S550 chassis, and have done lots of alignment work for Vorshlag as well.

 

[luc]

It’s obviously the toe
I will take the Ford gt350 track specs with a grain of salt
2* camber is far from being enough for track duty
As for the debate about how much toe:
Zero toe create the least tire wear
It is true that you gain a slight toe out under braking but you spend way more time/miles not braking than braking
As a point of reference, i run 2.8 camber and zero toe in my track only Mustang with squared 305 nt01
Get your toe checked, your wear is 100% toe related

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