I have 2 new front SO6's for VIR. What can I expect? I have only run with used ones previously.

Will they be the best there going to be fresh on the rims? Do they need scuffed in or will I need to heat cycle them first for 24 hours? Thanks.

 

You should scrub them in with 8-10 laps then let them sit a full 24 hours before the next use. I found lower cold presures worked well for me...I started out at 23 cold. The car had annoying understeer when I used the Hoosier recommended cold pressures. My first set of SO6's almost caused me to give up on Hoosier's....Once I got the pressures down they seemed pretty darn good. Car weighs 2750 as raced.

 

The new Hoosiers, R6s, should be heat cycled as Brant said. I have gone through a couple of sets and like them, but also find that lower temps than Hoosier says to use are better for me. I liked them 36-38 hot on my 3150lb 993. Unlike previous Hoosiers, they heat cycle out before I cord them.

 

I'll be using the R06 for the first time in a few weeks, and so anticipating a ten pound rise (give or take), starting psi on 3000 +/- pound car should be in and around 26/28?

Wow, never have I started so low on a non-slick.

 

Good starting point I would think...Play around with them...lower cold pressure is better in my experience.

 

I'm with Bob on these. Below 40 psi hot seems to be my best range. 36 to 38 psi. after that they get slippery with my fat 993 tt.

 

That's good to hear because when I got a set I thought it was just me- anything over 38 hot was decidedly greasy when it used to be 40. 36 was spot on. I did not heat sink them and have used them for five DEs this past Summer (but have rotated and flipped them regularly). Next weekend will be their last. I really like them and will say everybody wonders why I'm so fast this year...well it ain't me.

Hoosiers- the tire of the Gods.

 

HD, on my 993 I found that they were very similar to MPSCs, if you have ever run them, when it comes to cold/hot temps (except for the warm-up period required by the MPSCs). Hoosier says start at ~ 30psi (1% of car weight), but that got me to at least 40 when really pushing it. Getting over 40 will give you that Rhinoceros-on-a-wet-clay-bank feeling.

 

What are you running on the back? I had a pair get mixed with 05's and it did not feel good.

 

I am driving an "89" 951 with a race suspension, 3000lbs approximately. My rears are S04's. In the past I have found a 6-10 pound increase in pressure depending on ambient temps, track and pre session tire temp stagger. For VIR I ran the rears 1 pound less than the fronts to equalize them. The SO4's felt best at 40 to 41 hot. So am I going to have a problem with handling because of the models and drastic difference in temps? I was told I wasn't when I purchased them, but also told the SO5's were a mess.

 

Mark,

Just out of curiosity, why not just use Toyos for DEs and save those slicks for if and when you start racing? Seems like Toyos get you 90-95% there and they last so much longer that the cost differential is remarkable. No reason to squeeze those last few seconds out at a DE, no?

TD

 

Bull --

Oh God! Not that old "Rhinoceros-on-a-wet-clay-bank" feeling!

Seriously... thanks for the advise. If there is ANY problem I know just where to find you in the paddock!!

FYI - with the Hoosier GAC tires I was getting exactly a 10 pound rise.

HD

 

You can expect lethal oversteer, especially if the S04's you have on the rear have a lot of heat cycles on them. Do yourself a favor and get a set of rear S06's to match your fronts. Others are correct about the lower cold pressures. You want mid 30's hot, so don't start with anything more than 30 cold. I generally see a 6 to 9 pound rise, but YMMV.

 

At an ambient temp of ~65-75 F

Cold 28 psi
Hot 35-36 psi, I run 35 psi.
This is on my 2680 LBS RSA

If it's colder out (Below 55 F) you will have to start at a higher cold pressure.

FYI, I got 885 Miles and 30 Heat Cycles out of my last set of R6's

 

That's about what I got from mine, but I got three times that from RA1s . .