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Old 11-14-2010, 02:54 PM   #1
Noek
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Default GtR uses difft size wheels, why can't we?

Reading that the Nissan GtR comes standard with 20" wheels, however the fronts have a 40 profile while the rears enjoy a 35 series. The fronts are also 9.5" wide wrapped in 255 rubber, the rears are a whopping 10.5" wide with 285!

What gives, I thought difft size and width played havoc with an awd system, or is it just Subarus awd system?
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Old 11-14-2010, 03:04 PM   #2
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Not when it's designed around the tire sizes.
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Old 11-14-2010, 03:19 PM   #3
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First off, the tires are hugely different widths, but they are very close in circumference - only 0.6" difference. One tire is 27.9" in diameter, the other is 28".

Second, it's easy enough to engineer an AWD driveline to deal with different tire sizes, but it's much more difficult to switch between even and staggered sizes. You need to re-gear the driveline to account for the difference.
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Old 11-14-2010, 03:28 PM   #4
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Quote:
Originally Posted by sniper1rfa View Post
only 0.6" difference. One tire is 27.9" in diameter, the other is 28".
Actually, that is only 0.1" difference.
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Old 11-14-2010, 03:52 PM   #5
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if you really wanna screw up the handling of your precious subaru

i mean REALLY screw it up


play around with different size wheels and tires
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Old 11-14-2010, 04:07 PM   #6
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Quote:
Originally Posted by Uncle Scotty View Post
if you really wanna screw up the handling of your precious subaru

i mean REALLY screw it up


play around with different size wheels and tires
what you dont want to make your car that naturally understeers, understeer more?
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Old 11-14-2010, 04:41 PM   #7
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Quote:
Originally Posted by 4-n-zics View Post
Actually, that is only 0.1" difference.

Thanks, but i said 0.6" difference in circumference. You'll note that diameter and circumference are not identical measures.
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Old 11-14-2010, 04:44 PM   #8
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Quote:
Originally Posted by sniper1rfa View Post
First off, the tires are hugely different widths, but they are very close in circumference - only 0.6" difference. One tire is 27.9" in diameter, the other is 28".

Second, it's easy enough to engineer an AWD driveline to deal with different tire sizes, but it's much more difficult to switch between even and staggered sizes. You need to re-gear the driveline to account for the difference.
Thanks man, def clears it up for me. Is the reverse true as well if they ran a setup that was identical for fr and rear? Would it be bad for the driveline?
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Old 11-14-2010, 04:53 PM   #9
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Quote:
Originally Posted by Noek View Post
Thanks man, def clears it up for me. Is the reverse true as well if they ran a setup that was identical for fr and rear? Would it be bad for the driveline?
irrelevant....and it would handle in a dangerous manner, I'm sure

the car is DESIGNED......DO you understand what that means???

designed for a particular setup from the factory

deviating too much from THAT without KNOWING EXACTLY what you are doing....you would need a LOT of experience and education to get close to knowing.....is a real bad idea


and again.....the heart of all rice is people trying to compare a 'race car' or 'super ca'r(or near super car, the GT-R is in this category) to a regular, plain jane subaru(or whatever else)
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Old 11-14-2010, 05:23 PM   #10
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the car also has the power STOCK to push wheels and rubber like that....plus you really need a 19 or 20" set up on a subaru? joking right?
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Old 11-14-2010, 05:23 PM   #11
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Sooooo......yes?

(stepbrothers)
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Old 11-14-2010, 05:50 PM   #12
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Quote:
Originally Posted by Noek View Post
Thanks man, def clears it up for me. Is the reverse true as well if they ran a setup that was identical for fr and rear? Would it be bad for the driveline?

Probably. They probably have very little reason to change tire sizes though.
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Old 11-14-2010, 06:06 PM   #13
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I have considered doing this, but backwards on my 2011 STi. 10.5" wheel with 275 up front, and 9.5" wheel with 245 out back. I've found some tires that are the same diameter and revolutions per mile. The problem is that we can usually fit 265s all the way around, so I'd be giving up grip in the rear... back to the drawing board. This might be a good setup for autox or gynkhama.
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Old 11-14-2010, 06:10 PM   #14
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You wouldn't be the first to do that.
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Old 11-14-2010, 06:22 PM   #15
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Quote:
Originally Posted by 4-n-zics View Post
Actually, that is only 0.1" difference.
Reading, it's fundamental.
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Old 11-14-2010, 07:01 PM   #16
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Quote:
Originally Posted by SedonaScooby View Post
the car also has the power STOCK to push wheels and rubber like that....plus you really need a 19 or 20" set up on a subaru? joking right?

I believe that he was mostly referring to the different widths. Like can he run XXX wide up front with XXX wide in the rear like the GTR does.
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Old 11-14-2010, 07:24 PM   #17
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Correct, I have no idea WTF he was talking about, why I ignored his post.
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Old 11-14-2010, 07:39 PM   #18
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I'm guessing he took it as "if the GTR has staggered 20's, why can't I have staggered 20's". Just a little miscommunication is all, no biggie.
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Old 11-14-2010, 07:54 PM   #19
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It was just an informative question on why diff awd systems are able to run difft width and circ tires is all, nothing else

Not sure where all the other crap came from
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Old 11-14-2010, 08:02 PM   #20
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Quote:
Originally Posted by sniper1rfa View Post
You wouldn't be the first to do that.
Yeah, I'm not proposing that I'm innovating anything. I know a bunch of the Japanese track cars do this already and it helps to balance the car at the expense of overall grip. But their cars get driven for a couple hundred miles then get torn down and rebuilt. I put 4k miles on my 2011 STI in the first month...
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Old 11-14-2010, 08:20 PM   #21
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^ did you own a wrx before that?
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Old 11-14-2010, 10:11 PM   #22
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Yes, I had an 06 wagon. 108k miles in under 5 years, and my car spends LOTS of time parked at the airport (about 2+ months out of the year) because of work. My daily commute is already 58 miles round trip without me going out, eating and doing other random stuff. For this reason, I have to keep everything reasonably functional and be reliable all the time. I've only had the wagon towed a couple times, once was for the diff and rear diff taking a dump, and once for a major collision.
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