Tire setup for track

Johnstone

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I'm shopping for a pair for track tires.. thinking of Mickey Thompsons ET streets.

Im confused on why peoole are saying to go with 28th? Cant i just get 265/35/17s

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Norm Peterson

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Even that's a good bit shorter than OE (25.7" vs ~27").

But they'd be do-able on wheels at least 9" wide (preferably 9.5 or 10) if you don't mind ending up with about 1/2" more tire to fender gap.

You didn't say which kind of "track".


Norm
 

OX1

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Even that's a good bit shorter than OE (25.7" vs ~27").

But they'd be do-able on wheels at least 9" wide (preferably 9.5 or 10) if you don't mind ending up with about 1/2" more tire to fender gap.

You didn't say which kind of "track".


Norm

Does anyone run ET streets on a road course?
(have to admit I thought about it for a second, when
I realized my 295 NT05's fit up front, HAHA!!)
 

Norm Peterson

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More than once I've heard of people running on DR's at autocross, so I wasn't going to assume any limits on the kinds of use these might see.


Norm
 

Johnstone

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Even that's a good bit shorter than OE (25.7" vs ~27").

But they'd be do-able on wheels at least 9" wide (preferably 9.5 or 10) if you don't mind ending up with about 1/2" more tire to fender gap.

You didn't say which kind of "track".


Norm
For 1/4 mille.



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mrfatride

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I think they meant 28" tall tire for drag radials. Tends to help with gearing a little as most modern mustangs with 3.73's will run out of gear in 4th before crossing the line. The slightly taller tire should allow you to cross the line before hitting the rev limiter
 

Pentalab

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I think they meant 28" tall tire for drag radials. Tends to help with gearing a little as most modern mustangs with 3.73's will run out of gear in 4th before crossing the line. The slightly taller tire should allow you to cross the line before hitting the rev limiter

With a 3.31 rear gear + 27.25" tall tire, I hit 150 mph @ 6 krpm. With a 3.73 rear gear + 27.25" tall tire, it then becomes 133 mph @ 6 krpm. 4:10 gear + 27.25" tire = 121.1 mph. 28" tall tires would have bigger sidewalls though, and really big if using a 15 /17" diam wheel.
 

JJ427R

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I have never considered running my ET streets on the road course, wonder how they would work. Only worry is I don't have much wheel well clearance with those on the rear. I run an 18" Roush wheel with 29" tall 305/45/18, pretty tight fit...
 

Pentalab

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I wanted a 305-40-18 in anything but a drag radial..and nobody makes such a tire. So went to plan B... an used a MPSS in 305-35-19 for the new rears. (27.4" diameter).... on new 19 x 10 rear wheels ( 48mm ET). Fronts are now 285-40-18 on 18 x 10 wheels (45mm et. 3mm front spacer used). Fronts are 26.97" tall.

So far, so good. What baffles me is I can't tell the difference between the front + rear rims, even though rears are 1" bigger diameter. Nobody else can either. Some kinda optical illusion. What is apparent though is the rear oem 11.8" rear rotors look smaller, like they look almost silly. Now you can see all the red BMR LCA's and BMR lca re-locate bracket stuff, and roush blue rear sway bar. A 20" rear rim would really make oem rear rotors look puny.
 

mrfatride

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With a 3.31 rear gear + 27.25" tall tire, I hit 150 mph @ 6 krpm. With a 3.73 rear gear + 27.25" tall tire, it then becomes 133 mph @ 6 krpm. 4:10 gear + 27.25" tire = 121.1 mph. 28" tall tires would have bigger sidewalls though, and really big if using a 15 /17" diam wheel.

With the Mt-82 in my old '13 mustang with a 27" tall tire and 3.73 gears i was hitting the limiter (7000rpm) in 4th around 113mph which happened somewhere around the 1000-1100ft mark on track
 

Pentalab

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With the Mt-82 in my old '13 mustang with a 27" tall tire and 3.73 gears i was hitting the limiter (7000rpm) in 4th around 113mph which happened somewhere around the 1000-1100ft mark on track

5th gear on your MT-82 = 4th gear on my 2010.... both are 1:1 ratio. So that would explain the difference. That plus my rev limiter is set lower..at 6250 rpm. (used to be 6500)
 

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