mdrums

Are you running a 993? Aren't they lighter than the current 997? If so they you can go with even a little less pressure than what I use in my 997.

Maybe you are having a alignment issue...possibly rear toe is out if the car is sliding out at any tire temp.

Stephen Fisher

This is a 997 GT3. David Murry was thinking possible rear toe out when he stepped our of the car. This is something I will check. The suspension is stock with the rear bar full soft and the front bar one off of full stiff.

mdrums

Yep that is what I was thinking based off what you said...hence my post above.

I certainly am no expert but in the rear you need some negitive toe. Too little and the rear end will come around and too much you will chew through tires.

I only have a 09 997.2S with Sport PASM and I run around .14 degrees toe per side. I get great tire wear on the street and track. I am sure others with GT3's will chime in here with there specs. I know there have been posts on GT3 alignment here and on the DE Racers Forum so maybe do a search there.

Hope this helps....best of luck with this.

tcsracing1

so for front, what is preferred 18"? 245, 255 or 265?

any interferance with ABS?

deputydog95

Subscribed.

deputydog95

What car are you running the 335's on? I would love to know if they would fit on my stock ride height 07 GT3.

V

Bumping this thread (as well as on the 996 board). I am going to get some track tires and I have two different options for my BBS wheels. I was first thinking about r888 in 335-30-18 for the rear instead of 315-30-18. For the rear wheels I have the option of going either 12" or 12.5" wide but it's very tight so the 335s would not fit with a 12.5" wheel but probably with a 12" wheel. The 315s are a more safe bet and would fit both with 12" or 12.5" wide rear wheel. So basically I have three rear options:

1. 888s 335s on a 12" wheel
2. 888s 315s on a 12" wheel
3. 888s 315s on a 12.5" wheel

So the 335 will be very big and bulge a little bit on the 12" wheel, less stretched means less responsive and a little sloppy. The 315s provide less grip but the contact patch will be big for their size and the 315 on a 12" rim will provide great feedback since the tire is a little stretched and less sidewall flex when compared to the 335. Is a 12.5" wheel too wide for a 315 tire? It could work and the tire would be very stretched. Better than a 12" wheel? Probably not. Which of the three alternatives would you recommend?

In the front I will run 888s 265/35/18 on a 9.5" wheel.

I would love to run MPSCs instead but they are not available in these sizes. Although the 888 tick many boxes, they are a heavy tire as well. It's so sad they stopped making the 315-30-18 MPSC..


Appreciate any feedback.

Have a good weekend!

utkinpol

you did not take to account 275/315 combination from Nitto NT01 tires.

275 is 25.55" tall, 315 is 25.35" tall, there is a chance that with proper ride height setup it will work fine in the 997 car with no PSM/ABS CELs.
nt01 is much better tire than R888 and 315 NT01 is pretty wide with 12.6" width. will fit fine on 9.5/12 rims.

if you find RA1 tires in 335 - they are taller than 275 NT01 and this setup works fine on my car, compound is similar but old RA1 tires are not as soft as new NT01.

V

Thanks for the feedback. I didn't mention this but I have a 993TT. It's unlikely that 275/35/18 will fit on my car, unless Nitto tires are small for their size. I think 265/35/18 is already a stretch I'm afraid. I will check but if the front fits then NT01s are definately an option. I assume it's as heavy as the r888?

So there is no gain in going from 12" to 12.5" with a 315 rear tire? I think the answer is no unless it's a 315 tire which is very wide for it's size like Hoosier R6. I read somewhere that a 315 Hoosier R6 is about as wide as a 335 RA1.

Hardback

NT-01 is the same compound from what ive heard. I run mine at 33-35 hot front / 35-37 hot rear on 18s..

utkinpol

i run fronts 32-33 hot and try to keep rear at no more than 3 psi above fronts. with bigger gap rear end starts to slide.
compared to ra1 i think nt01 is more sensitive to proper temperature and it takes a bit longer to warm them up until they start to bite properly but once warmed up they bite better. it is just my subjective opinion, i do not have any data to back that.

as of 'same compound' - it was said that nt01 and ra1 are same, to my nails feel at hot tires after run they are not same and they do not come to 'proper' grip at same time. but my RA1 were 2007 made and NT01 were brand new so it may play a big role here.

as of 'going from 12" to 12.5" with a 315 rear tire' - 335 tire sits on a 12" rim with sidewalls perfectly vertical. it is their 'native' size. so if tire got stiff enough sidewalls it probably will be fine, it not - you will definitely benefit from some stretching on 12.5 rim. for 315 tire max rim width is specified as 11.5" with 'native' size set to 11" so on 12" rim sidewalls will already be at some angle and it should not be dramatically different from a stretch on a 12.5" rim, imho.