Traction Issues 12' Roush Stage 3 - Mustang Evolution

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Old 01-12-2014, 03:55 PM   #1
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Traction Issues 12' Roush Stage 3

I am helping a friend get better traction in a 12' Roush Stage 3. He intends to road race it on the Autobahn, and the Nurburgring etc. So far his best has been only a 12.90 1/4 because of traction limitations, and has been losing to camaro ZL1's on the straightaways.

I understand they came with the Roush suspension kit, 1" lowered, struts, sways, arms and panhard, but I believe they have stock 3.31 gears and a limited slip with carbon fiber clutches. I also think the stock wheels are 9.5" out back, 20" with a 275mm wheel.

I suggested the following:

New wheels for competition use with a Mickey or equivalent drag radial in 325mm out back, Or if he doesn't want different wheels I suggested at least going to a 295mm on his 9.5" (will a 305 or Nitto 315 fit?) 3.55 gears with upgrade axles and the Ford Racing Fr500 torsen diff (T-2R) Carbon fiber one piece driveshaft with a safety loop.

Any opinions, advice, suggestions?
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Old 01-12-2014, 06:17 PM   #2
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You're offering to waste a good amount of money on stuff that won't deliver what you say he wants. I sure wouldn't put more gear in a TVS Roush, or use the Torsen. The factory carbon T-lok is fine at this level as are the factory 31 spline axles.

I also wouldn't drag radial a stick car unless it was for road use. They just don't work, especially in the bigger size rims and they break driveline stuff. You need a slick for competition use on a maximum 16" wheel.

What your buddy is experiencing is the same for every tweaked Roush car I've seen...and really any TVS equipped Mustang. You're always fighting for traction and it makes the car slow in a straight line for the power its making.
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2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP
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Old 01-13-2014, 08:44 AM   #3
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Ok! Any suggestions? I appreciate your help!
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Old 01-13-2014, 08:53 AM   #4
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Like I say in the second para: Tires. Get the right ones for the work you're doing.

Dedicated drag slick for the strip, Road race tires for the track, street tires for the road.

I have a set of 16" 00 Mustang wheels and a 28" bias slick. My purpose was to maximize what the car has. On a 3.73 N/A car this is a pretty good setup, as you can see from the results in my sig.

The Roush upper tamed the wheelhop and the tires deliver the engine's power. I'd say I am a touch over-tired but, better that than what your buddy is struggling with. I can drop the clutch at 6K is I feel like it.

So, all he needs to do is get a cheap set of dedicated wheels and put on a properly-sized slick and he'll be laughing. Strongly recommend a Stifflers DS loop for quality, ease of install and track legality, as most will want a loop on any car with a slick tire.
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2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.42 at 120.64

2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP
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Old 01-13-2014, 10:09 AM   #5
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Great! I'll pass the info along.
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