deputydog95

I would guess that other than running heavy banked tracks, alignment should be similar across the board for most DE drivers on regular road courses. I run -3.5 up front and around -2.5 out back on hoosiers. That also seemed to work well with the SS' and the pyrometer readings came in generally around 180. I suspect they are really closer to 200 though as I checked them myself after I drove in off track and there is a 1-2 minute delay. I use a probe unit from long acre that also has infared. I noticed about a 8-10 degree difference between the two and am assuming the probe is the right number.

Larry Cable

agreed! 180! ... bingo ... right slap bang in the middle of the 160-200 range ... I'd say you have it dialed!

mdrums

Larry...or anyone educated on this....

I run a 12" wide rear with 305's. Michelin and everyone else says 11.5 is max width for 305"s...however Porsche sends out the GT3 on 12" rears with 305. This is 1/2" past the recommend max from tire manufactures.

Right now I'm running either 235 or 245 on a 8.5" wide front....I get this it's not optimal and I hope to be selling my wheels for a different set of track wheels.

Thoughts and opinions please!

mdrums

Dog...I need to borrow your pyrometer...PBOC May 19th...OK?

Larry Cable

well spotted, that never occurred to me...

I think you either have to trust Porsche chassis engineers (who did this with Michelin tire engineers when they homologated the N spec 305 MPSC's on the GT3's) or you have to imagine that they f*cked up or had a stack of 12" rims doing nothing behind Zuffenhausen and an accountant somewhere had a bright idea ...

Nick Wong

Mdrums- I wouldn't worry about it. 1/2" one way or another isn't a big deal. It may not be optimal but it's far from a bad fit, definitely within the realm of the ballpark. The 19" sidewalls are quite tall and can accommodate the difference.

deputydog95

I run a 305 in the SS on 19x12's. That is TR's recommended fitment. It's fine and not even remotely stretched. Widths vary tire to tire, but in the case of the SS I can stack them without the rims touching as there is enough tire buffer. versus the kumho v710 which looked like they were going to pop off my 18" track wheels at any moment they were so stretched.

Sure.

Larry Cable

The 19" 305 Corsa's look a little stretched on the back of my 3 I must admit