RickBetterley

My new track car (1995 993) came with shaved Toyo RA1s, 245/40&275/35x18. I am considering getting Hoosier S06s for the next set, although I hear the Toyos are almost as good and wear a lot longer.
So - the Toyos fit, but just barely, on the fronts. Tire Rack couldn't really offer much advice as to size for the Hoosiers, but their recommended was one size down from my current set. I wold hate to buy tires that are too large, but equally hate to buy tires that are smaller than max.
Does anyone have any suggestions/expereince as to whether the Hoosiers in the same size as the Toyos would fit as well (or better)? I know the Hoosiers are new and there won't be much experience.
Also - any thoughts as to the Toyo v. Hoosier argument?
Finally - Toyo shaving comes in 4/32 and 2/32nd depth. I had no idea; which should I prefer for 100% track work?
Thanks

Greg Fishman

There was a recent thread on this, you may want to search the 993 board also.
On 18's go with 245/35 upfront (the 245/40 is too tall, IMO) and either 285 or 275's on the back.

onasled

The people at Tirerack know nothing so don't even bother asking them.
RA1s run a bit narrower then Hoosiers. My 225/45/17 Hoosiers stack about a total of 2' higher then my 235/40/17 RA1s.
I would say that if the RA1 245/45 is almost to wide then the Hoosier 245/40 may fit. If you vist the Hoosier site you will find specs for sizes and you can compare them to Toyos.

Get the RA1s shaved to 4/32 if you are doing DE and 2/32 if you are racing.
I only use the Hoosier in wets, but may try the new r6.

bobt993

245/35 front, 285 rear, roll the fenders, monoballs rear and you can go with 295 in the rear. ( inside will rub otherwise without spacers. ) Prior 285s corded from Hoosier anytime you blink. I run 3 deg camber front, 2.8 rear. 245 really turns in well. Same with MPSC 235 on the front. Good Luck.

993944S2

I had the same experience as Greg above. 245 front .. 285 rear. Hoosiers and MPSC would fit. Although the MPSC did rub just a bit on the inside oil line. I did not have problems with cording the Hoosiers. I belive you need narrow body hollow spokes.

Don

bobt993

Don, alot of club racers in our region have had cording issues on 285's. When you really push these tires, they go. . If you notice, all the reviews on the TireRack websit are gone. It was full of 911 owners ripping Hoosier for adverse tire wear in the back. I just corded my final set (285s) at VIR after 5 heat cycles. Camber may have something to do with it. Don't get me wrong, I like the performance of Hoosiers and would use them in a Sprint race. Oil line rubbing will happen with Hoosier and MPSC's. You can use a 5mm spacer (max!) if you roll your fenders to get rid of this problem but, monoball bushings is the best solution.

RickBetterley

Thank you, Greg.
Are your suggestions for the new Hoosier R6s?

George from MD

Greg is correct and probably eminently more knowledgable than I.

FWIW I run Hoosiers in 285/30 rear and 245/35 front. I have not had any cording issues. In fact doing short DE sessions (twenty to thirty minutes a pop) the tires lose their grip well before I lose all the tread. I do run two sets (one new each year) and flip them about halfway through the season. My car is lowered and I did have to roll the fenders. The fit is tight- esp. in rear but I have no rubbing issues.

BTW I was just told I had to wait until July for the RS06 rear sizes. I am running RS06 up front and RS 05 in rear right now.

George from MD

Also meant to say I was told by knowledgable rep that the RS06 was designed to give a slightly better grip and eliminate the cording issues many racers have experienced on rears.

Greg Fishman

The S06's should be the same sizes as the S04's or 5's, but you may want to double check that on the Hoosier website.
Someone mentioned the 295 and you can probalby get that to fit but the tire is a larger diameter tire and it will affect the gear ratios and the acceleration somewhat. On some tracks it might be a better option, on others worse.

George A

Ok, I run some pretty wide tires on my NB 993. Most recently, I had 245/40-18's and 305/30-18's in Hoosier R3S05's. As Greg mentions, they are a little too tall, which changes you gearing. They can fit but I do have my fenders rolled and am using custom offset wheels. I plan on running 265/35-18's and 305/30-18's Pirelli slicks at the end of the month for a BMW CR. Just my data point. I do have a set of S04's in 225/40 and 285/30 that I plan on using just for messing around.

George

Mark in Baltimore

Greg,

How badly do your think the 295 will kill acceleration with the increased leverage? Is the 295, in general, a bad idea?

Greg Fishman

Mark,
I ran the 305/30's and the difference was noticeable. The 305's were a full inch taller than the 285's, the 295's are .7" taller. So I would guess you would feel the difference but have no idea if it would translate into a better or worse lap time.

bobt993

I asked Joel Riser this question (pca guru for tech questions on pca.org) and he suggested 295's. He also thought them to be the max size for the 993. You may loose acceleration, but momentum and grip is a good trade off. I can pretty match pole time laps (club racing) on Hoosiers at Summit Point and VIR , but 1 sec off on MPSC's. Just cannot afford to burn up Hoosiers all the time. Dr. J had stressed 32/36 pressures on Michelin's so much that I wasted 4 run sessions last week (VIR) really getting this down and he was absolutely right on. I never had MPSC's get that close to Hoosiers before.

KOAN

bobt993
Do you mean 32/36 F/R hot? What do you start with cold? I've been trying to get 34-36 hot, and start, depending on the ambient temp, in the low 30s cold.