Tractionlimit

iTrader: (12)

Haha, now that I have your attention, I have a few questions:

1) Could this tire fit under the back of the X with moderate fender work?

2) Do aftermarket (coilover) suspensions provide addition inside clearance over the stock rear strut?

3) Is it possible to run a narrower front tire with a wider back tire if they're close? such as 265/35-18 front and 315/30-18 rear (Azenis, of course)? I don't know enough about the center diff to know if a very small difference in diameter would cause issues.

Please don't hate, I'm just getting ideas for a future track setup. If this is possible, we might be able to take better advantage of our awesome rear diff.

Thanks!

XxXtremeEvoX

wow are you serious. I know mustangs go that wide for better traction, but on a Evo? i think you missed it when you said moderate fender rolling/work, more like extensive fender work. can I ask why you want to go that big in the rear? want a staggered look?

JoeyM3

iTrader: (10)

give it a shot, you might need some real agressive wheels and major fender work, but you can't run staggered tires unless you want to roast your diff, gl on the venture, i think robispec did a 305

its not diameter that will throw off the center diff, its the width

fullracehonda

iTrader: (1)

horrible idea like they said, plus 315's and 265's are not "close" ... at all

that would be a bigger stagger than most front engine rear wheel drive cars run

CC16

Top fuel evo.

Robevo RS

iTrader: (16)

why everybody try to put those monster tires on the cars? i don't get it.
Not to mention not too many people have a
high whp car yet...

Tractionlimit

iTrader: (12)

Yeah, that's kinda what I thought you guys would say.

I want to go wide, but i don't like huge tires in the front, and I seem to be wearing out my rears faster anyway (go figure). 315 was probably an exaggeration, but I wanted to see if the diffs could tolerate any diameter/width difference.

Does this mean we should never use the donut spare if we have under/over sized tires?

What technology allows staggered tires on AWD 911s and other AWD supercars?

Thanks.

Tractionlimit

iTrader: (12)

Original Equipment Sizes for 2005 Porsche 911 GT2 (AWD)

Front Size: 235/40-18
Rear Size: 315/30-18

Sure, I'm not in 911 whp territory yet, but someday...

dave_evolvix

iTrader: (1)

They most likely are not as staggered as you suggested, and quite obviously, they design the car with staggered tires in mind, therefore they can tolerate it to an extent.

StevenStarke

iTrader: (77)

the porsche starts off RWD and then transfers power to the front as needed. And the driveline is in the back. I have 285/30's and I cant see why you'd need more then that man

Robevo RS

iTrader: (16)

well ,, all those test with that Porsche on those tire sizes, with less weigh and way better /R compound/ tires vs the X set up.
And how much is a G pad difference?
That is all i can say about the AWD system on the Porsche.

/i love the GT3 RS i have to say /

Phalse

iTrader: (2)

Its not the width that kills it, its the overall diameter. The 3s TT camp is big on the staggered offset and the popular combination there is the 245/45/17 and a 275/40/17, which is the same rolling diameter, plenty of people ran it for many years with no ill affects. Now, I dont know if there are any common 18" sizes that easily match rolling diameter.

BTW, yes its not perfect, but i believe its a few % off, go research it on www.3si.org/forum

DC_TypeR

iTrader: (10)

Robi Spec has done a few 305/30/18 set ups, one I seen personally.

You do need spacers in the front and rear.
you do need a 10.5" Rim
you also need well over 400 whp to feel the benefit. Other then that, your just killing your track time with extra rotational mass.

I think for the Evo's looking for more meat, 285/35/18 would be the limit for now.

Just remember though, anything bigger then a 255 puts you in a modifyed class, and not in street class no more.

-Chris

Tractionlimit

iTrader: (12)

FYI - In addition to the 245/275 combo, the 235/315 Porsche combo is virtually identical too:

Comparison to 245/40-18:

Tire Size * Revs/Mile * (Difference)
245/45-17 * 785 * (0.1%)
275/40-17 * 786 * (0.2%)
235/40-18 * 794 * (-1.2%)
315/30-18 * 793 * (-1.1%)

That said, you are all probably right that all that meat would probably slow me down more than anything else.

JoeyM3

iTrader: (10)

like steve said the porsche awd system is totally different from the mitsu awd system, by all means try it, i think you'll have the first x with a fried tc good luck