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-ollie-
Newbie


Joined: 26 Sep 2018
Posts: 12



PostPosted: Wed Oct 24, 2018 8:39 pm    Post subject: 997 GT3 Tyre Advice Reply with quote

Hi Guys,

New member here, just posted in the "noob" section to say hi bye

I've a 997.1 GT3 CS that I'm doing a few trackdays in. I'm new to Porsches, but not new to TD's and also circuit race an E36 M3.

My car is currently on OEM 19's, with Michelin Pilot Sports.

I plan to fit some Cup 2's before my next TD in a couple of weeks. I'd like to know what the maximum width you guys have run front & rear on OEM wheels is. I'm tempted to fit;

255/35/19 front
325/30/19 rear

Has anyone else done this? A Pilot Sport looks a little stretched to me with a 305 on a 12J, and I think the front end would benefit from a slightly wider tyre.

Can anyone point me in the right direction of the best (most competitive) source of Cup's? I'm not accustomed to buying such large tyres - yet!

Thanks in advance.

Ollie
 
  
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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2712
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Wed Oct 24, 2018 8:51 pm    Post subject: Reply with quote

There are many suppliers who may have promotions on at different times so always worth checking a few, but in general Camskill are hard to beat on price for straight forward mail order and Blackcircles are a good combination of decent price along with making it easy to book fitting at a place that’s convenient in the same transaction.
_________________
991.1 C2 PDK, 986 Boxster S
Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 
  
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-ollie-
Newbie


Joined: 26 Sep 2018
Posts: 12



PostPosted: Wed Oct 24, 2018 8:56 pm    Post subject: Reply with quote

MJA911 wrote:
There are many suppliers who may have promotions on at different times so always worth checking a few, but in general Camskill are hard to beat on price for straight forward mail order and Blackcircles are a good combination of decent price along with making it easy to book fitting at a place that’s convenient in the same transaction.


Spot on, thank you. I'll check both of those out.

Do you have any experience of "super sizing" tyre sizes, particularly on the front?
 
  
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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2712
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Wed Oct 24, 2018 9:17 pm    Post subject: Reply with quote

I liked the standard tyre widths on my GT3 aethetically plus I tend to stick with factory settings so I don’t have supersizing experience, but I have seen discussion on here about slightly wider front tyres as well as geometry and arb settings (more negative camber and softer arb settings at the front/stiffer at the rear) to increase front end grip.

By the way, welcome to the forum, invaluable experience and expertise on here, opportunities to meet up sometimes too. Great choice of car, had fun in mine, amazing machine on a track, yours being a CS even more so Thumb
_________________
991.1 C2 PDK, 986 Boxster S
Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 
  
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Senoj
Zolder


Joined: 23 Jan 2006
Posts: 5130
Location: Sussex


PostPosted: Wed Oct 24, 2018 10:12 pm    Post subject: Reply with quote

255 probably won’t fit the front. 245 should but you may need extra camber, what’s it set to? 305 on the rear, 325 will probably rub. 305 is stretched as it’s a 12” rim but it’s also spaced 5mm from the factory. Either way that’s plenty of tyre. It will understeer when pushed on a std geo regardless.

I would go 245 f, 305 r, then get it set up with more camber both ends.

Welcome to the forum.
 
  
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-ollie-
Newbie


Joined: 26 Sep 2018
Posts: 12



PostPosted: Thu Oct 25, 2018 8:50 am    Post subject: Reply with quote

Appreciate the input guys, have just found a good deal on some new Cups in OEM size so they're on order.

Also dropped Chris @ CG a note asking for a slot to get a geo done. No idea what the settings are at the moment!
 
  
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MaxA
Barcelona


Joined: 11 Oct 2015
Posts: 1271
Location: Helsinki


PostPosted: Thu Oct 25, 2018 9:06 am    Post subject: Reply with quote

-ollie- wrote:
Appreciate the input guys, have just found a good deal on some new Cups in OEM size so they're on order.

Also dropped Chris @ CG a note asking for a slot to get a geo done. No idea what the settings are at the moment!


FWIW, I think you've done the right thing. If you have decent tyres and a good set up, you're soon in the zone.
_________________
2010 9972 C4S PDK: Carrara White, Sea Blue. Mostly driven, lightly modified, occasionally tracked, and usually a bit grubby.
 
  
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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2712
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Thu Oct 25, 2018 9:13 am    Post subject: Reply with quote

Amongst many things it taught me, my GT3 responded to geo settings more than the regular 911’s I’ve had, there’s more that can be adjusted of course. Factory settings were fine for all rounder (camber -1’30”, standard arb and ride height) and with less camber, softer arbs, top of ride height range it was nicer on the road, but not surprisingly would understeer on the track. Set lower, with at least -2’ camber, stiffer arbs etc., it made a big difference plus with an instructor shouting in my ear I could avoid understeer by driving it properly Embarassed

CG know all this inside out of course and will personalise it for you.
_________________
991.1 C2 PDK, 986 Boxster S
Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 
  
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