frayed

Does anyone know how much of a difference you can get away with in rolling diameters b/t front and rear, given the car's AWD system? Stock rubber is either 0.1" or 0.2" difference fr/rr depending on whether you run S02A's, Pirellis, or Contis.

I'm trying to figger out if I am stuck with running MPSCs and Corsas on the track, or whether I could move Hooters or Kumhos.

Grassyass.

George A

Are you saying the "Hooters" are different diameters?

BTW, you probably don't want to run the Kumho's. I've noticed that they don't work well on heavier cars.

George

frayed

Yeah, the new Hooters in the S04 variety don't come in the 225/295 stagger. I would have to go 245/305, with a bit more of a rolling diameter difference, I think .3". I'd probably have to go with a different set of front wheels as well to accomodate the extra 20mm up front.

I've run the Kumhos on my M3. I like the feel and grip, but they do wear fast.

George A

Why not run 245/285's? They are nearly the same diameter. Is the C4S a 993 or a 996?

I ran Kumho's for a couple of years. It got to the point were they would only last one (1) DE at MSR. Yes, one. It drove me nuts.

Finally, I wouldn't call it being stuck with using MPSCs and Corsas. Those are probably your best choises. Both of these will grip so much better than the Victoracers. Oh yeah, they last for a long time.

George

frayed

George, a 996 as stated in the title. I'm most interested in running the new Hoosierdaddies, though I did like the Kumhos (on a different car).

With the Hooters, the 245/305 stagger would reduce the front/rear stagger from 70mm to 60mm. The 245/285 stagger would knock it down to 40mm. Perhaps too drastic of a footprint change? At this point, I'm on stock suspension, so I don't have a lot of options for setup changes to accomodate changes in understeer/oversteer balance.

George A

Ops, I guess I should have read the title. Since most, if not all of the new P cars are set up for understeer, you might actually get better ballance in the car. Remember, Hoosiers tend to be wider than most other tires in the same size. You might want to go with 225/285 if you are worried about front/rear stagger.

George

Palting

Frayed, I've run and corded 2 full sets of 225/285's Dunlop SSR's. No issues with the AWD VC. Worked like a charm.

JimB

In Hoosiers you can use either 245/35-285/30 or 245/40-305/30.

George A

Jim, I think he is worried about the .3" difference in diameter between the 245/40 and the 305/30. Not a big deal in my opinion and should mess with the all wheel drive. I've heard of a guy at the track having difficulties with slicks at 645 and 660 (front/rear). I've got a friend trying the 245/40 - 305/30 combo in Sept. on his 996TT and will let you know how it works out.

George

frayed

Yeah, just trying to understand the parameters I'm confined with due to the AWD system. I think the Hooters may be the way to go, but since I can't drive to the track on them, I have to work out a roof rack solution going that route.

George A

Jeff, two things (I might get blasted for this): I've driven to events that are 70 miles from house on slicks (Yoko's). It's ok during summer, but I'm not sure I would try it if there was even the slightest chance of rain. Second, the Hoosiers don't last very long, maybe one DE if you drive them hard. Why are you so big on them? In your case, I would go with the MPSC's. Unless you are racing and want that extra 0.5 of a second, I wouldn't recomend them. You know, last time I looked at Corsa's, the Tire Rack had some pretty good prices on them, about $50 less than the MPSC's.

George

Greg Fishman

If you car has a street alignment you will ruin a set of Hoosiers in a day if they are driven very hard. Go with the MPSC's as they all have the same rolling diamerter in the 18's (225/265/285, at least)

frayed

Ahh, good point. Forgot about that. Just watched a fella at the track this weekend cord his expensive S04's, running only 2 degrees of front camber (though this was on an M3).

JimB

I should have been more clear. One friend of mine is doing DE in his 996 Turbo using the Hoosier 245/35-285/30 combo and another is club racing using the 245/40-305/30 combo so I have seen both work without problems. Having said that, I agree that Hoosiers are not the best DE tires unless you have a track setup, an extra set of wheels and a big tire budget.
Jim

frayed

I've driven to and from events on just about every R comp except Hooters. Indeed, this weekend I drove to/from TWS on MPSCs. I got caught in a hurricane-like downpour and was fine. AWD and PSM certainly help out; I just keep my speed reasonable. But then again, after 3 days use on the MPSCs, they still have lots of tread (at least on the inside). If I ran a tire like the Hooter, I'd have to mount a roof rack and take them with me.


Ahh, how am I supposed to answer that; you are using too much logic. LOL.

It's silly really, it's the GFCP (Go-Fast-Crack-Pipe). Even though I'm just out there having fun, any advantage to turn the fastest laps among my friends, and not have to pay for happy hour, is a welcome leg up.

Thanks for the heads up. May try them out after the PSCs are dead. But, right now, they seem to be wearing like iron and I've been pretty ham fisted with them. Pretty impressive actually.

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On my M3, I was running -2.5 to -2.85 degrees of camber and 0 toe up front. I'm not too keen on getting that aggressive again with the Pcar, as I went through tires pretty rapidly on the street. But, based on tire wear on the track with little camber (could only get -0.5), I think I'll have to add some front camber, I'm guessing in the -1.5 ish range. Probably good for PSCs, but still not enough for Hooters as already pointed out above. . . I won't say I'd never go aggressive again though, as I'm naturally attracted to things like big camber, Hooters (both kinds), and Motons like my 3 year old to cotton candy.