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Discussion Starter #1
Hey everyone,

I just came over from the GTR world and that cars AWD system was finicky with tires with too much of a difference in RPM’s. If there was too much difference you could burn up the AWD system. How strong is the AWD system in our R8’s? The R8 I picked up has 245/30/20’s in the front and 325/25/20’s in the rear. They are MP4S’s. The RPM are off a bit. More than the GTR would like. Am I running major risks in the R8? Thanks all....
 

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Hello fellow ex-GTR guy here as well.

Honestly don't know the threshold if it's an issue as I've kept stock tire sizes. Regardless, this DCT is much more advanced (at least on the Gen 2 (2016+)) than the GR6 from the R35 so I'm assuming it has tolerances that are much more relaxed than in the GT-R.
 

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I know GTRs were pretty sensitive to the tire heights , front and back tires had to been pretty close to each other otherwise ETS clutches burned quick . I think Audi doesn't have the same issue , there is a pretty big difference in tire heights from the factory . Fronts 245/30/20 are 25.8 inches [ 806 RPM] , rears 305/30/20 are 27.2 inches [764 RPM]
 

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Actually, the tire size difference between the front and rear of the R8 plays a role in the Quattro system's F:R torque variance. That's why I don't think it would be wise to get close to a 1:1 ratio. . .might suck.
 

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Discussion Starter #6
Hello fellow ex-GTR guy here as well.

Honestly don't know the threshold if it's an issue as I've kept stock tire sizes. Regardless, this DCT is much more advanced (at least on the Gen 2 (2016+)) than the GR6 from the R35 so I'm assuming it has tolerances that are much more relaxed than in the GT-R.
Whats up dude!!! I remember you on the GTR forums.... I was on there as CCLQ7R......
 

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Discussion Starter #7
Thank you all for the replies..... I feel better know!!
 

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Whats up dude!!! I remember you on the GTR forums.... I was on there as CCLQ7R......
Welcome to zee German side of things :p
 

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Actually, the tire size difference between the front and rear of the R8 plays a role in the Quattro system's F:R torque variance. That's why I don't think it would be wise to get close to a 1:1 ratio. . .might suck.
I don't think it will be a problem . RS3 , TTRs guys run square setups without any issue
 

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Hey guys, sorry the threadjack, but didn't want to start a similar topic. I want to salvage a couple of my old snow tires from my GTR. I did a size comparison and between the stock 305/30/20 tires on the car and my 285/35/20 snow tires, the diameter difference is 2.6%. I know that a 285 tire fits on an 11" wide wheel without issue, so do you guys think I could run that on the rears? If so, would you recommend i use the same ratio of 2.6% difference on the fronts as well? Like a 235/35/20 on the front would produce a 2.7% difference, so front to back should be spot on.
 
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