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JayG60
Silverstone


Joined: 14 Jun 2004
Posts: 138
Location: United Kingdom


PostPosted: Fri Jul 14, 2006 1:05 pm    Post subject: Reply with quote

I am sure a lot of you will frown at me at even suggesting putting 18's on a 964 C4, but I am just researching. :)

If I were to fit 8x18 Front and 9x18 Rears on a 964 C4 what size tyres would I need to run, 225/40/18 front? rear? Would the stretch over the 9 affect the 4WD at all? and last of all are there any other mods that would need to be done, other than perhaps coilovers, or decent suspension.

Cheers

Jay




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Jay T
Barcelona


Joined: 21 Apr 2004
Posts: 1334
Location: Out West


PostPosted: Fri Jul 14, 2006 1:09 pm    Post subject: Reply with quote

I think I've seen a member's 964 here with 18" sport IIs. Can't remember who though or if his was a C4. It may have been the other other Jay.

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Rodders
Magny-Cours


Joined: 12 Mar 2005
Posts: 2594
Location: Banchory

1995 Porsche 993 Carrera 4

PostPosted: Fri Jul 14, 2006 1:12 pm    Post subject: Reply with quote

Previous poster wrote:
Quote: Originally posted by JayG60 on 14 July 2006

I am sure a lot of you will frown at me at even suggesting putting 18's on a 964 C4, but I am just researching. :)

If I were to fit 8x18 Front and 9x18 Rears on a 964 C4 what size tyres would I need to run, 225/40/18 front? rear? Would the stretch over the 9 affect the 4WD at all? and last of all are there any other mods that would need to be done, other than perhaps coilovers, or decent suspension.

Cheers

Jay


you might have to watch the diff with a C4 running on weird tyre size combos..........not as much as the problem is with a Calibra turbo(where you have to replace tyres in sets otherwise you knacker yer diff)................you also might run into probs too insurance wise by using too narrow tyres to whats recommended.....IIRC the back of my 993 C4 has 255's and tbh I would'nt run anything less


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Rodders
Magny-Cours


Joined: 12 Mar 2005
Posts: 2594
Location: Banchory

1995 Porsche 993 Carrera 4

PostPosted: Fri Jul 14, 2006 1:16 pm    Post subject: Reply with quote

this was info i got from a mate of mine who's pretty technically minded



"The 911 has the same system / issues. A 4wd 911 relies on having differing wheel diameters front and rear to keep the VC pre-loaded to a set amount, designed into the diff. Then, as the rear wheels spin up, the fluid heats up more and transfers drive to the front. Same principle as the Synchro system sending it rearwards. On a 911, if you dyno it on a non-synchronised 4wd dyno you can literally cook the diff...and blow it, as the rear wheels spin under drive, the VC gets too hot...and fails."



HTH


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Rodders
Magny-Cours


Joined: 12 Mar 2005
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Location: Banchory

1995 Porsche 993 Carrera 4

PostPosted: Fri Jul 14, 2006 1:18 pm    Post subject: Reply with quote

obviously you still are running the same diameter wheel,but the profile needs to be taken into consideration and also the tyre footprint is also quite important,as tho its 4WD its very rear biased so you narrow the footprint at the rear your affecting its traction/handling characteristics

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993C2S
Zolder


Joined: 05 Aug 2005
Posts: 5996
Location: Berkshire

1997 Porsche 993 Carrera 2S

PostPosted: Fri Jul 14, 2006 1:20 pm    Post subject: Reply with quote

Jay,

Ask these guys:

http://www.ninemeister.com/

Or Rennlist 964 forum. 18s on the 964s I've seen tend to be on Carrera 2.

Rodders, your rears will be 265s.


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Asim
 
  
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Rodders
Magny-Cours


Joined: 12 Mar 2005
Posts: 2594
Location: Banchory

1995 Porsche 993 Carrera 4

PostPosted: Fri Jul 14, 2006 1:31 pm    Post subject: Reply with quote

Previous poster wrote:
Quote: Originally posted by 993_2S on 14 July 2006

Rodders, your rears will be 265s.



ya sure......mind i'm narrow body......cos they're only 255/40/17's and they're the same as the Colour Coded Cup2 wheels n tyres that I took off to replace with the Cup2's n tyres I'm running




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Daniel
Donnington
Donnington


Joined: 02 Feb 2005
Posts: 11858
Location: Not where I want to be!

2000 Porsche 996 GT3 Mk1

PostPosted: Fri Jul 14, 2006 1:38 pm    Post subject: Reply with quote

I am running 265's on my narrow body with a Factory lowered Chassis, it looks tight, but it has never rubbed..

Dan


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993C2S
Zolder


Joined: 05 Aug 2005
Posts: 5996
Location: Berkshire

1997 Porsche 993 Carrera 2S

PostPosted: Fri Jul 14, 2006 1:38 pm    Post subject: Reply with quote

Sorry mate, good point n/body 255/40/17.

Get some 18s mate!


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Asim
 
  
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Rodders
Magny-Cours


Joined: 12 Mar 2005
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Location: Banchory

1995 Porsche 993 Carrera 4

PostPosted: Fri Jul 14, 2006 1:40 pm    Post subject: Reply with quote

Previous poster wrote:
Quote: Originally posted by 993_2S on 14 July 2006

Sorry mate, good point n/body 255/40/17.

Get some 18s mate!



waiting for ma numbers first tho.........got a hankering for some LM's or Speedlines Twisted



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993C2S
Zolder


Joined: 05 Aug 2005
Posts: 5996
Location: Berkshire

1997 Porsche 993 Carrera 2S

PostPosted: Fri Jul 14, 2006 1:43 pm    Post subject: Reply with quote

Speedlines definitely Wink


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ian_uk
Imola


Joined: 24 Jun 2005
Posts: 777



PostPosted: Fri Jul 14, 2006 2:22 pm    Post subject: Reply with quote

Check this for information
http://www.porsche964.co.uk/technical/964%20wheels%20and%20tyres.pdf

18s were never approved for the 964 except the 3.8RS and it does put more strain on the body than is recommended. However it has been done by some people. Personally I like a nice set of original 17" Cup 1s on a 964. 993 17" Cup 2s also fit. Both use the same tire sizes.

Ian.

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