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Old 03-19-2008, 07:29 PM   #1
gbwrx
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Default A-Stockers running Hoosiers

Are the tires rubbing much? I have been running 275/40/17 V710s for the last couple of years and wanted to try some 275/40/17 Hoosiers. My 710s have always rubbed some but not enough to care about. I have searched quite a bit and was unable to tell if the Hoosiers rub much. My set up is 06 STi with Whiteline bar and Ohlins.
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Last edited by gbwrx; 03-19-2008 at 07:53 PM.
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Old 03-19-2008, 11:06 PM   #2
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Those Kumhos have got to be fun to mount. Aren't those wheels 17x8?
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Old 03-20-2008, 09:54 AM   #3
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My tireplace would cringe when i brought in my 275s for mounting... I never ran anything but Kumhos so I don't know about any addtional rubbing from hoosiers. I know the STi that Jonathan Roberts drives usually has hoosiers mounted on them with no problem....
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Old 03-20-2008, 12:59 PM   #4
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Quote:
Originally Posted by Mere View Post
I know the STi that Jonathan Roberts drives usually has hoosiers mounted on them with no problem....
Correct. Jonathan co-drives the '05 STi with Donnie Barnes. I spoke with Donnie at a local event last year in Danville, VA and he mentioned he had no rubbing issues running the hooisers. He ran the stock BBS wheels for the longest time, but used some new 5-spoke wheels last season (not sure of the brand or offset)

Pic of Roberts in the car from last year's DC Pro Solo (courtesy Alex T. of Team WTF?!):

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Old 03-20-2008, 08:35 PM   #5
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Yep, 17x8 wheels. I either run the stock BBS wheels or some Rota Boost 17x8 48 offset. The place I take them to get mounted has never complained. I asked the first time taking them and they were happy to do them.

Thanks Chiketkd -- nice to know!!
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Old 03-20-2008, 08:46 PM   #6
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Quote:
Originally Posted by gbwrx View Post
Yep, 17x8 wheels. I either run the stock BBS wheels or some Rota Boost 17x8 48 offset. The place I take them to get mounted has never complained. I asked the first time taking them and they were happy to do them.

Thanks Chiketkd -- nice to know!!
One thing I should add, Barnes runs Ohlins fixed perch struts on his STi. Not sure what struts you use but this could also have an affect on tire rubbing (as ohlins & konis reduce the 'rate' of body roll).

I'm no expert on his car, I just specifcally asked him that question about his 275's as the 245/40/17 Hoosiers on my former '06 2.5L WRX rubbed using the stock +55 offset wheels (they didn't rub on alltracin's '06 that used +50 offset wheels).
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Old 03-20-2008, 09:20 PM   #7
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I have the Ohlins on my car also and it has helped a little bit with the Kumhos rubbing since I have gotten them.
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Old 03-21-2008, 01:56 AM   #8
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Hoosiers ARE wider. A6's Vs 710's ... 2X 315/17's + 2X 335/18's

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Old 03-21-2008, 05:07 PM   #9
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A little OT ... what tire pressures are you guys running in your 275 710's. At the National Tour last weekend, a friend was complaining about grip with their new 710's. Turns out they had their air pressure way up the high 30's. I'm use to 29/25 with a ASP Vette, so I told them to bring them way down. It helped, but I see on this photo that with those tires on the narrow 8" oem wheels, that the tire is really rolling over and being pulled from the wheel. The ASP Z-06 is a good 300 lbs lighter then the AS STI. Suggestions as to tire pressures?

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Old 03-21-2008, 05:08 PM   #10
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I know the 710 is good on camber challenged cars ... so perhaps the roll over isn't too bad, but what about the fact that the tire is being pulled off the rim?

Next race is on the VERY grippy surface at El Toro ... ProSolo
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Old 03-21-2008, 10:26 PM   #11
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Would like get some feedback for tomorrow's AX practice ...
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Old 03-21-2008, 10:54 PM   #12
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If it were me, I'd add some air to the fronts. The sidewall buckling that you see is a sign of not enough support for the carcass. More grip will make that worse. Air is that support.

Of course, if you get a bunch of runs... try it both ways.
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Old 03-21-2008, 11:17 PM   #13
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Anything done to the car? I ran approx. 42-45 Front and 53-56 Rear without the Ohlins and with a front sway bar. I have only run one event so far with the struts and ran 41-42 Front and 52 Rear. This is on 710s.

Anyone with Hoosiers what are you running pressure wise?
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Old 03-21-2008, 11:21 PM   #14
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Quote:
Originally Posted by makofoto View Post
Hoosiers ARE wider. A6's Vs 710's ... 2X 315/17's + 2X 335/18's


I have always heard that you can count on Hoosiers being wider. I did read somewhere thet supposively the 275 V710's are wider. Don't really believe it. I have a set of 275 Hoosiers coming on Tuesday so I will be able to see for myself.

Edit 3/25 -Got the tires today. The 275 Hoosiers are definately wider than the 275 V710.

Last edited by gbwrx; 03-25-2008 at 09:49 PM.
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Old 03-22-2008, 09:18 AM   #15
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I run the 275 v710's in AS and run pressures in the mid 30's. The guys I have talked to running Hoosiers in the same same situation run higher pressures.
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Old 03-22-2008, 11:38 AM   #16
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Quote:
Originally Posted by makofoto View Post
A little OT ... what tire pressures are you guys running in your 275 710's. At the National Tour last weekend, a friend was complaining about grip with their new 710's. Turns out they had their air pressure way up the high 30's. I'm use to 29/25 with a ASP Vette, so I told them to bring them way down. It helped, but I see on this photo that with those tires on the narrow 8" oem wheels, that the tire is really rolling over and being pulled from the wheel. The ASP Z-06 is a good 300 lbs lighter then the AS STI. Suggestions as to tire pressures?
imho if you advise your friends to run pressures similar to that on an ASP C5, with uber wide wheels, less weight and more camber you are going to destroy those tires in half the time they would normally last. You can not do an apples to bananas tire pressure comparison.

With the lack of camber and extra weight on the nose anything under 40psi in the front will be a death sentence for those tires on that skinny wheel. I would guess this is their first, or one of their first sets of R tires.... The "lack of grip" is most likely a reaction to the tires not being the miracle they expected to transform the car. If the front end does not have grip, slow down.

btw another wacky comparison for you, in our 3200lb AS Corvette we ran that same tire on a 9.5" wide wheel at 40psi front, 35psi rear. This is very close to the C4 that won AS at SD last week.

More front weight, less camber, and a smaller wheel does not equal less pressure.
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Old 03-22-2008, 04:04 PM   #17
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I'm with Wolf, mid 30's (36 seems OK), higher on sticky concrete. We had an interesting event at MMP, like a huge autocross around half track (we've done both East and West tracks this way), 36 seemed just fine with 710's on 8" Rotas.
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