[jbass524]

Originally Posted by kenneth

Tire pressure is a big mystery to me. What would you guys recommend as hot pressure for Dunlop direzzas star specs? I am currently running them between 40-42 hot front and rear. Thanks!

I had 2 sets of these and I highly suggest 38 - 39 hot.

[kenneth]

Originally Posted by jbass524

I had 2 sets of these and I highly suggest 38 - 39 hot.

Thanks JB, anybody else wants to chime in on the Direzzas?

And sorry for the OT!

[mid-corner fun]

Originally Posted by kenneth

Thanks JB, anybody else wants to chime in on the Direzzas?

And sorry for the OT!

I start at 34 cold and end up at 42-44 hot but they get greasy towards the end of a 20-25min session. Next time I go out my plan is to start out at 30 cold and take it up 1PSI per session. Now that the weather cooled down a bit I can focus on other things other that battling oil temps and limp modes.

[jbass524]

Originally Posted by PeterM1

I start at 34 cold and end up at 42-44 hot but they get greasy towards the end of a 20-25min session. Next time I go out my plan is to start out at 30 cold and take it up 1PSI per session. Now that the weather cooled down a bit I can focus on other things other that battling oil temps and limp modes.

In my experience 42 - 44 is way too high. You're doing the right thing by starting at 30. The greasy feel would not be nearly as bad if you kept them to 38 - 39 hot.

[subieworx]

Originally Posted by 335isGuy

Agreed on the Nt01. I have run the r888, RA1's, and cups. Personally for price, consistancy, and longevity they are a great tire. Predictable, Constant, great turn-in, no break squirm. Also does not require great camber to make them happy.

Gonna try the BFG R1's this season if I can get my hands on a few sets.

NT01's have the same compound as R888 with softer sidewalls. We were unimpressed.

the BFG R1's are ok, but are NOT forgiving. The line between grip and slip is nonexistent.

[mid-corner fun]

Originally Posted by jbass524

In my experience 42 - 44 is way too high. You're doing the right thing by starting at 30. The greasy feel would not be nearly as bad if you kept them to 38 - 39 hot.

I had the chance to try out 12 pressure configs on the last event, courtesy of PCA cramming 6 x 25min sessions per day, 2-day event. It still amazes me how they do this..

Anyway, starting at 29f/32r cold and going to 35f/36r hot did wonders for me w/the StarSpecs. Lots of grip and they don't get greasy till the end. The downside seems to be loss of audio feedback at the edge, I noticed that at 35PSI they'll just straight skip when they lose traction. Oh well, done for the season here in the East Coast, more testing next year

[zsapphire7]

Originally Posted by PeterM1

I had the chance to try out 12 pressure configs on the last event, courtesy of PCA cramming 6 x 25min sessions per day, 2-day event. It still amazes me how they do this..

Anyway, starting at 29f/32r cold and going to 35f/36r hot did wonders for me w/the StarSpecs. Lots of grip and they don't get greasy till the end. The downside seems to be loss of audio feedback at the edge, I noticed that at 35PSI they'll just straight skip when they lose traction. Oh well, done for the season here in the East Coast, more testing next year

wow that low? Maybe i should lower my pressure down to 39~. Ive been running 42/41 hot on z1s... they do get greasy tho. Ill try it next time and see how they turn out but it seems to be starting to roll over onto the sidewall if I go lower..

[mid-corner fun]

Originally Posted by zsapphire7

wow that low? Maybe i should lower my pressure down to 39~. Ive been running 42/41 hot on z1s... they do get greasy tho. Ill try it next time and see how they turn out but it seems to be starting to roll over onto the sidewall if I go lower..

I didn't expect that either... From my previous runs I knew that 42 hot gets real greasy fast so I worked it down from there. 38/39 hot is not bad either but the tires give in after ~15 mins and then it's sliding time again. Going down to 35/36 hot gave me very good grip at the expense of skipping when pushed beyond the limit. What's annoying with skipping is the loss of momentum, with sliding at least you have a chance of gracefully sliding your way our of a turn.

Looking back at the vids, virtually all the cars I passed or even lapped with 42 hot caught up to me during the session after the tires gave in, with 35/36 hot I at least had the chance to give some 911 TTs a run for their money :-)

[Dble Trouble]

Hello all, I'm new to the forum, but have been a track rat for years 16ish or so. Although I am not a fan of the R888's either, they are a hell of a lot more tire than Direzza's. To the OP, I think something is up, and although I have not taken the time to read the entire thread, I saw a lot of discussions about tire pressures etc. I rank the Star specs as one of the best street tires, but with no comparison to even the shittiest of R comps. I'm in Toronto and spend a lot of time at Mosport, there the r's are worth almost 4 seconds a lap. For those of you who don't know Mosport is an ex F1 circuit and has a very fast 10 turn layout, no really tight turns, so everything is about momentum and high lateral g's. That said i do prefer the RA1's from Toyo, too bad they aren't available anymore. NT01's I didn't like at all and Pilot sport cups last longer but ultimate grip is down from the r888's and ra1's. Just my two cents.

[SoCaliBimmer]

What about filling the tires with nitrogen? Wouldn't that help with maintaining the same pressure hot or cold?

[stltri]

Was reviewing this thread and was wondering what sizes of tires were being used at the track? Does everybody use a squared setup when they switch to R compound or semi-R compounds?

[jbass524]

Originally Posted by stltri

Was reviewing this thread and was wondering what sizes of tires were being used at the track? Does everybody use a squared setup when they switch to R compound or semi-R compounds?

Square tire setup is the first big handling upgrade anyone should so IMHO...street tires, Rs or near Rs.

Camber plates next. After that you're left up to your knowledge, preconceived notions and good or bad advice.

We're all such marginal or even bad drivers that things like nitrogen are silly. Sure it might make a difference but all that time you left in any # of turns due to not great technique is more a more important issue.