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NLW73
Imola


Joined: 27 May 2014
Posts: 770
Location: Yateley


PostPosted: Sat Mar 04, 2017 3:05 pm    Post subject: 245 40 18 on front of mk2 GT3 996 Reply with quote

anyone running or have run this size on front of the GT3 996 on 18s?

is it too wide and not worth doing?

would be on the OEM mk2 wheels which are 8.5j I think

just out on interest.

thanks, Nick
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996 GT3 mk2 - Guards Red
 
  
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Stuart
General
General


Joined: 16 Sep 2007
Posts: 5025
Location: Waterworld

2004 Porsche 996 GT3 Mk2

PostPosted: Sat Mar 04, 2017 4:23 pm    Post subject: Reply with quote

I've bought a set of 245 R888R to fit but as of yet not fitted. NXI20 is your man with the answers as I know he's done this.

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Disco
Estoril


Joined: 13 May 2008
Posts: 3558
Location: Hertfordshire

2010 Porsche 997 GT3

PostPosted: Sat Mar 04, 2017 6:26 pm    Post subject: Reply with quote

Stuart wrote:
I've bought a set of 245 R888R to fit but as of yet not fitted. NXI20 is your man with the answers as I know he's done this.

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I know that Nick has been running 245 fronts and 305 rears on 19s for a while, but as far as I was aware the only thing that he used on 18s these days were slicks? I am sure that he will be along to clarify at some point, but do remember that NXI20 has not had anything like stock suspension for a very long time...

I'd have thought that 245f/295r is probably going to shift the balance of grip somewhat (going from 235/305 to 245/305 did), so at least ARB and possibly geo changes might be in order.

Further to that, even on 235s a feisty geo can rub through the arch liners under compression (yep - more tales from my 996 days) unless you have swapped the stock arms out for something more adjustable and had it configured accordingly, so 245s will only accentuate this. All other things being equal I don't think that it would be recommended without a subsequent trip to your geo shop of choice...

Question
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Colin

Black 997 GT3 3.8 CS - Acquired for the 2012 season and beyond
Black 996 GT3 Mk2 - Gone, but will never be forgotten
 
  
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NLW73
Imola


Joined: 27 May 2014
Posts: 770
Location: Yateley


PostPosted: Sun Mar 05, 2017 8:58 am    Post subject: Reply with quote

thanks fellas.

you are right about the balance and moving more to the front.

i think I will stick with OEM sizes. I got offered some really good price Michelins in that size but prob not worth and cause more hassles and issues.

I wanted to dial out a little bit of that turn in understeer but will have a fiddle with the camber and geo to sort that out.

nick
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NXI20
Approved Trader


Joined: 02 Feb 2008
Posts: 3213
Location: South Bucks

2004 Porsche 996 GT3 Mk2

PostPosted: Sun Mar 05, 2017 9:19 am    Post subject: Reply with quote

I don't usually run 18" wheels on the road, but various circumstances have conspired to leave me with a new set of OZ 18" wheels. As an experiment, I have mounted a set of R888R in standard sizes (235 / 295) on them but have yet to try them out. As Disco says, I run 245 fronts with 305 rears on 19" but I'm not convinced the need for 245 is there with 18".

Just for reference, I run 235/650x18 front slicks & 285/660 x 18 rears & that balance is really nice with a ton of grip at both ends.

If you feel the front is pushing on at turn in, you are probably not trail braking enough to put the weight on the nose.
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Need Alcon discs or Pagid pads? https://uber9s.com

2004 GT3 CS in Atlas Grey with too many mods to list!
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Senoj
Shanghai


Joined: 23 Jan 2006
Posts: 4985
Location: Sussex


PostPosted: Sun Mar 05, 2017 10:32 am    Post subject: Reply with quote

245 is 245 wether its 18 or 19 though. Sidewall height may increase depending on the profile. Can't see it being a massive balance issue at all on the road. Who doesn't want more front end grip on their 911 Question
 
  
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Disco
Estoril


Joined: 13 May 2008
Posts: 3558
Location: Hertfordshire

2010 Porsche 997 GT3

PostPosted: Sun Mar 05, 2017 3:40 pm    Post subject: Reply with quote

Senoj wrote:
245 is 245 wether its 18 or 19 though. Sidewall height may increase depending on the profile. Can't see it being a massive balance issue at all on the road. Who doesn't want more front end grip on their 911 Question


As I said though - depending on geo there is a potential rubbing issue on the arch liners and you can't add more rear contact either (on 19s you can go 295, 305 or 325 at the back, but on 18s the only thing that you can get bigger than a 295 is a Michelin PS2 {GT2 315s, but you also would need wider wheels for that}). Hence stock sizes and geo to suit is IMHO the way to go with the 996.
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Black 997 GT3 3.8 CS - Acquired for the 2012 season and beyond
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NXI20
Approved Trader


Joined: 02 Feb 2008
Posts: 3213
Location: South Bucks

2004 Porsche 996 GT3 Mk2

PostPosted: Sun Mar 05, 2017 6:28 pm    Post subject: Reply with quote

Disco wrote:
As I said though - depending on geo there is a potential rubbing issue on the arch liners and you can't add more rear contact either (on 19s you can go 295, 305 or 325 at the back, but on 18s the only thing that you can get bigger than a 295 is a Michelin PS2 {GT2 315s, but you also would need wider wheels for that}). Hence stock sizes and geo to suit is IMHO the way to go with the 996.


305 on 12" rims is as big as you can go on the 996. Even then, with some makes you need to roll the arches to avoid rubbing.
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Need Alcon discs or Pagid pads? https://uber9s.com

2004 GT3 CS in Atlas Grey with too many mods to list!
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