tiger 6

Tried searching this but no luck: what tire pressures[cold and hot] are best for Toyo R888 tires at the track for a GT3 RS? Tires are not shaved. Any considerations for breaking new tires in the first time? And lastly, what pressures should be run for street driving? Tires will be on stock rims.
Thanks.

C.J. Ichiban

if you have a chance to heat cycle them one or two days before you actually use them at the track, they'll wear better.

on the RA1s, I used hot pressures between 33 and 36 and they felt grippy- any higher and they got pretty greasy (which is fun). depending on ambient temps- start cold at around 27 or 29.

for street driving, the #s on the door work- cold @ 29 or 30 front and 32 or 33 rear.

you might find more specific info on the GT3 forum, lots of guys use these tires

Bob Rouleau

Toyo has issued new pressure specs 32 to 35 hot for the 888

tiger 6

Thanks, Guys.

MagnusB

From Toyos web page:
General Proxes R888 setup guidelines:

* Operating Temperature: 140°F to 220°F, optimum around 200°F
* Hot Inflation Pressures: High 30s to Low 40s (psi)
* Camber: -2.5° to -5.0°
* Caster: As much positive as possible

M758

Where is that?

TheOtherEric

I like the 2nd rec better myself now. At Gingerman this weekend, I noticed the squirminess really disappeared when I bumped up to 39F/42R, which is a few higher than I used to run.

FTS

Just a data point, although not for a 911, but between two seperate DE events, the later pressures worked so much better for me (f:34.5, r:38.5), in the previous event I had them at f:33.5 and r:36.5.

BobbyC

My GT3RS likes it best 34-36 hot. Also, if you have new unshaved tires then scrub them good before otherwise you'd feel like on skates.

jrgordonsenior

I'm amazed at how different everyone's experiences are with the R888's. I've found the tires to be at their very best when their brand new and unshaved. They may only last for a few laps, but those first few laps are always the fastest for me.

With the Spec Boxster's (2700lbs. w/driver), we've tried a variety of hot pressures from 42 down to 32. For me, the 33-34 range has proven to be the quickest....

IcemanG17

In my 2800 lb 928 with 295/30-18 front and 335/30-18 rear R888's at full tread the pressures seemed to like the high 30's....37-8 front and 36-7 rear worked quite well..... Also my 928 is about 55% front 45% rear balance

TheOtherEric

I'm wondering if the amount of camber may have an affect on optimal pressure. E.g. I only run -2 deg camber and my car felt too squirmy unless I jacked the rears up over 40psi. Just a thought.

stuttgart46

I'm running the 39 hot on the SPBOX and it seems just right.

boss351

One more data point, 996TT and 37-39 hot front and rear worked well for me.

jrgordonsenior

Since my last post in October I've dropped another 2 lbs. down to the 31-32 range. I keep getting faster so something's working....