Hey so most of you know im doing a twin turbo awd build,
i have 275/30/20 rear and 245/35/20 front and it works and doesnt throw off my VDC or what not.
only problem with the extra power im trying to avoid the stretched tire.
has anyone ever ran 285/30/20 rear with 245/35/20 in fronts on an AWD.
will this throw off the VDC or what not?
i really am trying to avoid stretching a tire on a turbo car making power. Will i have to change the front tires as well if i run the 285?

 

245/35 and 285/30 is actually a better combo than what you're running now. That's what I have on my x coupe

 

let me push the envelope,
290 or 295/30/20 Rear with the 245/35/20 Front Will any of these work?

 

I personally run 285/30/20 and 245/35/20 in summer and it works fine. (Although, I am lowered and have a tiny bit of camber) not sure on the exact specs)

295 could theoretically work with a bit of a pull.

 

295s! Some serious rubber!

 

First you should ditch the 20s and go down to 19s or even 18s. I wouldn't run 30 profile tires if trying to get grip. Beyond that dialing the alignment in properly will get better traction then just throwing in wider tires.

 

these are just my show wheels, i have 18's with drag radials as well, i was just wondering if it would throw off the AWD VDC

 

Agree about 19s
not sure if it matters to you but if you went 295 rear and didn't increase front track you'll cause more oversteer

 

Basically speaking, if you increase rear wheel grip with wider rear rubber, you'll increase understeer. Less grip up front, more in the rear, you push. Is this a coupe or sedan?

Edit: I also take weight into account. Certain sizes, and certain brands, are often much lighter. Will help in the handling dept.

 

275s should be good... get the power first then see if you need more rather than speculate what you need prior...
had a light car pushing over 500rwhp and 275s did just fine...
get the tires that has the widest contact patch for this size and right compound..
also depends on what your intentions are... street.. road course.. autox... drag...