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Let's get serious about track tires for GT350

MikeR397

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After 3 track days: Two 5 session days at Grattan and one at Waterford Hills. Rotating them tonight, the driver front just gets murdered! Have -2.9 degree camber. Still doesn’t look like I’ll get to 5 full track days on front Cup 2s.

Rears still wearing nice and even and slow. 4 days in and still barely see the outside grooves in both. Issue will remain heat cycling, probably around 36-40 sessions it seems per my last set.

Question: now that I have a cracked rear wheel and only 1 spare rear cf wheel, if my rears get heat cycled out would it be possible to throw on my front 305 cup 2 carbon wheels on the rear to finish the day? I know the rear wheels don’t work on front with 315s without spacers, but can the front cf wheels (on R) work on the rear with 305s?
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MikeR397

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they will poke out if you run fronts on the rear.. quite a bit....
Is that the only issue, cosmetic? I don’t want to roll a fender, but just thinking this would be a “get through the rest of the track day if my rears go bad” option, and then I could skip paying for a new rear cf wheel (or buying that new new set and trying to sell individual wheels for $2800).

I’d still bring the single rear wheel with me in case if a flat or something. Otherwise, three wheels fit better in the car than the 4th in the passenger seat which means I can’t see the passenger mirror when driving to the track!
 

JAJ

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Is that the only issue, cosmetic? I don’t want to roll a fender, but just thinking this would be a “get through the rest of the track day if my rears go bad” option, and then I could skip paying for a new rear cf wheel (or buying that new new set and trying to sell individual wheels for $2800).

I’d still bring the single rear wheel with me in case if a flat or something. Otherwise, three wheels fit better in the car than the 4th in the passenger seat which means I can’t see the passenger mirror when driving to the track!
They'll stick out an inch further than the stock rear R wheels. Making them fit without hitting will require some quality time with a Sawzall. :shock:
 

MikeR397

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They'll fit fine up front. Have a few buddies that have run the 315 tire up front. I run them square on 19x11 et50 wheels with 25mm spacers
Alright, I’m going to mount the 315’s up front with no spacer On the CF wheels. I need to eat up my 4 2015 year 315 tires faster than I can do on the rear. Really hope no rubbing on strut or fender!
 

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JAJ

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Alright, I’m going to mount the 315’s up front with no spacer On the CF wheels. I need to eat up my 4 2015 year 315 tires faster than I can do on the rear. Really hope no rubbing on strut or fender!
If you install them on the factory 11" ET24 fronts they'll be fine. I have run them on factory 11" GT350 rears with a 35mm spacer (gives ET27 on the front) and they work. 11" ET 24 rims will be even better.
 

MikeR397

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If you install them on the factory 11" ET24 fronts they'll be fine. I have run them on factory 11" GT350 rears with a 35mm spacer (gives ET27 on the front) and they work. 11" ET 24 rims will be even better.
Thanks for the confirmation!
 

Performance nut

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Has anyone used the heat cycle or shaving options from tire rack? Wondering if it is worth it.
 

MikeR397

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I’m looking for some data points form people who have run both the Oem R Cup 2 305/30/zr19 98y tire and then switched to the Porsche spec 305/30/19 102y Cup 2 Front tires and how much more tire life they got out of them. Is it worth the extra $ for these tires? I only pay $15 to mount at my dealer but it would be nice to get 7 days like I get on oem rears instead of 4 days only regardless what I do with the camber plates. Thanks for the data points
 

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I’m looking for some data points form people who have run both the Oem R Cup 2 305/30/zr19 98y tire and then switched to the Porsche spec 305/30/19 102y Cup 2 Front tires and how much more tire life they got out of them. Is it worth the extra $ for these tires? I only pay $15 to mount at my dealer but it would be nice to get 7 days like I get on oem rears instead of 4 days only regardless what I do with the camber plates. Thanks for the data points
Wow, that is cheap as hell. 4 cup 2 tires replaced at my dealer is $165 OTD.
 

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Well guys, I know It's been a year... but I want to thank everyone who chimed in on this thread. Because of you, just picked up a pair of the porsche spec 102 SC2's for Thunder hill & Laguna seca 19th and 21st for my Gt350R.

So excited to have a little tire left this time after ;) I'll let everyone know my thoughts on these compared to the stock SC2's.
 

jmn444

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Not sure if it's been mentioned, but the goodyear supercar 3 seems to be a really good option, me and a buddy are both running them, he's been competitive at autox and they seem to wear nice so far for track days and IMO are pretty close to RE71R grip, i almost want to say MORE grip but that's TBD still... I'll update with how many days/laps i get out of them only one so far but pretty impressed!
 

MikeR397

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Well guys, I know It's been a year... but I want to thank everyone who chimed in on this thread. Because of you, just picked up a pair of the porsche spec 102 SC2's for Thunder hill & Laguna seca 19th and 21st for my Gt350R.

So excited to have a little tire left this time after ;) I'll let everyone know my thoughts on these compared to the stock SC2's.
My car is in the shop so I can’t take a photo but I can confirm the Porsche spec 102y fronts last MUCH MUCH longer than the 98y tire and are absolutely worth the extra $. I’ve done 3 days and my driver front looks like near new with tons of outside tread still... compare this to 3 similar day’s on the 98y here...
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SgdriskillGT

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My car is in the shop so I can’t take a photo but I can confirm the Porsche spec 102y fronts last MUCH MUCH longer than the 98y tire and are absolutely worth the extra $. I’ve done 3 days and my driver front looks like near new with tons of outside tread still... compare this to 3 similar day’s on the 98y here...
69EB8264-FD3A-4B3D-857A-D4FF91C57E9A.jpeg
How does the grip level compare?
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