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Track/drag setup: Hoosier 28x10-17 on 2012 GT500


dschwal

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I know there are a handful of threads of different track setups for any years that have the 20" rear wheels. I have a 2012 with the SVTPP and tossed around the relocation of the rear sway bar to fit 15's or squeezing in Nitto 305s, M/T's or other drag radial. I haven't seen much on the setup I finally chose, so I wanted to throw out what I found. I went with the Hoosier 28x10-17 slicks ($220 from Summit - link below) mounted on some 17x9 replica wheels from American Muscle ($110/each - link and specs below).

 

The 28" Hoosiers are only slightly smaller than the stock tires when inflated. Theoretically, the diameter difference should be 0.1", although I did find it to be slightly more exaggerated in real life. The Hoosiers were at 15 psi, and I saw about 1/4" difference from the stock Goodyear ties at 35 psi.. I obviously I not concerned about the speedo difference for a track setup, and I never had any difficulty with the traction system registering problems.

 

There is very little overhang, as you can see here:

tires 2321

 

The clearance from the shocks and everything else in the wheel well is also more than acceptable.

tires 190545

As far as performance, I unfortunately only got two runs in this week. Both were disappointing, and I still have a lot to learn about launching this car with the slicks. I can say, though, that traction was perfect without a single slip at any point. Now, I just need to figure out the best launch RPM and amount of feathering/clutch dropping. Any experience from others here would really be appreciated!
Best run: 2.01 60': 12.4 @ 116

 

Wheels: 17 x 9 with a +30 mm offset (6.18" backspace)

 

http://www.summitracing.com/parts/hoo-18157/overview/

http://www.americanmuscle.com/chrome-10th-17x9-0512.html

 

Some other pics of the setup:

post-41179-0-20272100-1381367499_thumb.jpg

tires1 2323

Thanks for looking! I have really gotten a lot out of other's posts on this site and and happy to finally have something to add myself!

 

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This is great info and thread! Thanks for posting your findings. That's good prices on the wheels and slicks. Go to a track rental day to practice your runs. Lower control arm relocation brackets will help your launches and lower your 60' times, especially if your car is lowered. But not absolutely necessary to have fun. Thanks for posting the links, too. Your car looks nice.

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that is a great post. did you have to do any other mods to run slicks? (suspension or rear end) I'm hearing different views on that (I have 2014 Shelby GT)

 

No, I didn't have to modify anything to fit in this setup. If you want to run the 15" wheels, then you have to relocate the rear sway bar (there are a few threads on that). But as long you as get a 17" wheel with a backspacing above 6", there should be plenty of room in there to fit it completely stock. Mine is a 2012, though; I am not sure if anything changed slightly with the suspension for the 2013-2014 models.

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No, I didn't have to modify anything to fit in this setup. If you want to run the 15" wheels, then you have to relocate the rear sway bar (there are a few threads on that). But as long you as get a 17" wheel with a backspacing above 6", there should be plenty of room in there to fit it completely stock. Mine is a 2012, though; I am not sure if anything changed slightly with the suspension for the 2013-2014 models.

actually, on further research--the is a 17 that works & I'll run 28x10x17 slick. so your post was right on the money--thank you

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Update from some good runs last night (nice and cold - about 42 F). My car is 100% stock except for the slicks.

11.86 @ 119.7
60': 1.736
Tires at 15 psi

I launched at 3800 with a full drop of the clutch. I also slammed the gas to the floor a split second before dropping the clutch. The launch went pretty well with 10-20' or so of slipping and great traction once they kicked in. The shift into second grabbed hard and off I went.

I really like this setup. My one complaint might be the ride gets a little squirrely at 120 mph and those 10" slicks, but it's nothing to get too worried about. It's well worth it for the grip at the line.

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