I just got my first set installed on my 993 C4S and would like to know what the collective wisdom is on:

1. Hot Pressures
2. First heat cycle

Thanks

 

1) 38ish?

2) just drive them...first few laps be careful, as they'll be slippery...then just drive them...

 

My Nittos like 36 front and 38 rear hot pressures ...
As far as heat cycles go,i have over 40 on mine with great wear in the rear and i had to flip the fronts inside out because i didn't have enough camber originally.
I'm running -2.8 front and -2.7 rear although -3.0 front would be ultimate on my car ...

You will see soon enough if you need more camber as they will wear the outside shoulder really fast !
I already purchased another set for next season,they're a great value for the dollar and seem to last a fairly long time.

Cheers !
Phil

 

On a 993 C2 with 18' wheels, I keep them at 38 all around. This is a PCA stock class race car, so the suspension is modified accordingly.

My wife and I use the car at DEs and I think we have at least 50 HC with even wear and theey are still consistant. NT01s are the only non Hoosier R compound I have tried and I like them.

 

Not that it will help you much, but we run them at 30psi, but we are driving a 2000 lb 914 with a 3 liter. I found at 38 they lose a lot of grip, but my car is far lighter.

We scrubbed them and let them sit for a week. After that, I found they were like any other tire and best on the second hot lap, then going a little slower.

 

+1 whhat Matt said, on a light car run lower pressures.

 

What others have said. I used to run 36 hot front and rear with Nittos on my 964. Just be careful in the first session (HC) until they are scrubbed a little bit.

 

I don't think I've ever seen 30 hot on mine, but -- again -- light car.

 

36 on my 968...great bang for the $

 

Thanks for all the responses. The car is rather heavy, basically a stock weight C4S with Euro GT3 seats and does roll bar. I will try the 36 / 38 hot which I shot for on the Yokos AD08.

With the weather forecast for the TWS PCA DE this weekend, I will put on street rubber ...

 

I have a 993 C4S (AWD removed) weighing 3,160 w/ no driver and full of fluids. I have run through a couple sets of these and find that for big tracks with continuous lapping no more than 38 hot in the rear is good (-2.8 camber) and about 34 hot front (-2.5 camber). I've had extremely good tire wear across the tire. I find if I go much more than 36 hot in the front things feel noticeably less grippy/responsive. I've not verified these numbers with a pyrometer, just how I like the car to feel and even tire wear. I am running 235/275 sizes on 18 inch 996 hollow spoke wheels.

For AX/TT, it's a different story if wanting to maximize time. If you run the 34f/38r pressures above you'll be leaving time on the course...drop your hot pressure goal by 2-3 lbs front and rear and your second lap will be your money lap.

Great tire!

 

Based on wear pattern on a set I ran to the cord on a stock GT3...
34F 36R.

Will actually be striving to cord out the next set with a pound or two less.

 

On my 964 I start at about 28-30 cold and they get to 38 hot. Much more and they are very slippery.

 

What would you consider light 2400 lbs?

 

Yes. That's right about where mine is.