Porsche 944 Turbo - Alternative Porsche Wheel Sizes
Discussion
I posted this in the Porsche forum & only received one reply.
I've noticed that Renn68 visits this forum & thought he might be able to give some advice to a fellow Kiwi (although I've been resident in Blighty these past 11 years!)
I'm after some advice about what other Porsche wheels can be used on a 1990 944 turbo without wing clearance issues.
The standard wheel tyre combo is:
Front: 225/50/16 16 x 7J O/S 65mm Diameter= 631 mm
Rear: 245/45/16 16 x 9J O/S 60mm Diameter= 624 mm
I'm planning to upgrade the brakes to "Big Blacks" (993 Turbo caliper mounted behind the disk) so I'll need at least 17" wheels. I'm going to upgrade all the suspension but aim to retain a close to standard ride height.
I'm wondering what Porsche wheels & tyres will fit? I like the Cup II wheels but I'm concerned about the offset of some of the other Porsche wheels.
Running a conversion these seem to be the tyre size options:
Standard Front 225/50/16 diameter = 631mm
225/45/17 diameter = 636mm
225/40/18 diameter = 636mm
Standard Rear 245/45/16 diameter = 624mm
245/40/17 diameter = 628mm
245/35/18 diameter = 629mm
I don't want to have spacers or tyres that are too wide as I don't want stonechip & wing clearance issues. I'm keen to run Formula R rubber as this car will spend some time at the track, especially the 'Ring.
I've noticed that Renn68 visits this forum & thought he might be able to give some advice to a fellow Kiwi (although I've been resident in Blighty these past 11 years!)
I'm after some advice about what other Porsche wheels can be used on a 1990 944 turbo without wing clearance issues.
The standard wheel tyre combo is:
Front: 225/50/16 16 x 7J O/S 65mm Diameter= 631 mm
Rear: 245/45/16 16 x 9J O/S 60mm Diameter= 624 mm
I'm planning to upgrade the brakes to "Big Blacks" (993 Turbo caliper mounted behind the disk) so I'll need at least 17" wheels. I'm going to upgrade all the suspension but aim to retain a close to standard ride height.
I'm wondering what Porsche wheels & tyres will fit? I like the Cup II wheels but I'm concerned about the offset of some of the other Porsche wheels.
Running a conversion these seem to be the tyre size options:
Standard Front 225/50/16 diameter = 631mm
225/45/17 diameter = 636mm
225/40/18 diameter = 636mm
Standard Rear 245/45/16 diameter = 624mm
245/40/17 diameter = 628mm
245/35/18 diameter = 629mm
I don't want to have spacers or tyres that are too wide as I don't want stonechip & wing clearance issues. I'm keen to run Formula R rubber as this car will spend some time at the track, especially the 'Ring.
I'm not sure but if you haven't been on Rennlist it's a huge community of Porsche nuts and a wealth of information. Do a search on there and you'll probably find the answer a post a question like your one on here
http://forums.rennlist.com/rennforums
http://forums.rennlist.com/rennforums
One day I'll get to the Ring 
what size are you considering, 17's or 18's? I've run 17's on both my Silver Rose and the 968, primarily because 17's were cheaper and more easily obtained in NZ and 17" rubber is cheaper than 18". The stock 17" sizes are 7 1/2" front and 9" rear, 225/45 and 255/40 respectively. I Bridgestone RE540 and Dunlop DZ02 R compounds.
Basically, there are 2 different offsets around, and are refered to as 'early' and 'late' - your'll be after late - (after '87 for the 944's)so any original or replica cup wheel(1, 2, 3) in the late offset will fit.
For Targa, I run 9" all round with 255/40's although I'm running 2 1/2 to 3 deg -ve camber up front. A number of the 944S2's in the Bridgestone series are running 235/40's up front on 9". Note that I'm also running 2 1/2" race springs on the front struts - I'd have to check if 9" on the front fits with std dia front coils.
What brakes do you have now? are they the same size 4 pots as the rears or are the the M030 S4 sport brakes ( if the latter then I could be interested in them for the 968 )
If you want me to stick my neck out, I'd say 17's rather than 18's (less unsprung mass) and standard stagger - 7 1/2" with 225/45 front and 9" rear with 255/40's. In the late offset CupII's will fit no problem either end.
If you've got any other questions you can post here or email renn68 at loosecannons dot co dot nz
Hope this helps - George
what size are you considering, 17's or 18's? I've run 17's on both my Silver Rose and the 968, primarily because 17's were cheaper and more easily obtained in NZ and 17" rubber is cheaper than 18". The stock 17" sizes are 7 1/2" front and 9" rear, 225/45 and 255/40 respectively. I Bridgestone RE540 and Dunlop DZ02 R compounds.
Basically, there are 2 different offsets around, and are refered to as 'early' and 'late' - your'll be after late - (after '87 for the 944's)so any original or replica cup wheel(1, 2, 3) in the late offset will fit.
For Targa, I run 9" all round with 255/40's although I'm running 2 1/2 to 3 deg -ve camber up front. A number of the 944S2's in the Bridgestone series are running 235/40's up front on 9". Note that I'm also running 2 1/2" race springs on the front struts - I'd have to check if 9" on the front fits with std dia front coils.
What brakes do you have now? are they the same size 4 pots as the rears or are the the M030 S4 sport brakes ( if the latter then I could be interested in them for the 968
) If you want me to stick my neck out, I'd say 17's rather than 18's (less unsprung mass) and standard stagger - 7 1/2" with 225/45 front and 9" rear with 255/40's. In the late offset CupII's will fit no problem either end.
If you've got any other questions you can post here or email renn68 at loosecannons dot co dot nz
Hope this helps - George
Thank you Renn68 & Kiwi Carguy, you advice is invaluable.
Rennlist seems to be a good forum for answering technical Porsche questions.
I'm not yet ready to ditch my brakes George as the work on the car has been deferred owing to house renovations.
When I do have the cash to do the work I'll let you know if the brakes are available. They're the 928 S4 type.
I've only been to the 'Ring once - a long weekend with a bunch of northern petrolheads. All I can say is "awesome" - it's gotta be the "Everest of tracks!"
We went last October in my brother's 2002 Mini Cooper S - an awesome car (240 bhp GTT/Hartge engine, Quaife diff, light flywheel, Tarox 10-pot brakes, rose-jointed upper & lower control arms, powerflex bushes, Alta & Eibach anti-roll bars, rose-jointed drop links, camber plates, Bilstein PSS9 coilovers, 18" OZ Racing Superleggaras,Yokohama Parada Spec 2 215/35/18s, oil cooler, scorpion exhaust manifold to tail pipe, etc).
My brother returned to NZ with the Cooper S, an ex-Luxembourg LHD 1981 Ur-quattro (70,000 miles from new!) & a 1989 944 Turbo. His Mini may make the track out there when he gets his life sorted. Unfortunately we both suffer from the same affliction - an illness known as "Lindsey-itis" - only known to be treatable by one specialist - "Dr Dave" Lindsey!
The motorsport scene in NZ stikes me as a great one - friendly & with a wonderfully eclectic mix of cars in each field: Italian exotics, British & European classics, American & Aussie muscle, late Japanese, budget & upmarket european etc.
In the UK there are a lot of "cheque-book charlies" - low on skill & experience but armed with plenty of cash & the most exotic machine! The number of new "exotics" in the scrap yards here would make an enthusiast weep! Often it's a case of too much money & not enough sense.
I've plans for my car - but the house must come first - but that won't stop me doing the research & gathering advice from good people like yourselves.
Thanks,
Tim
Rennlist seems to be a good forum for answering technical Porsche questions.
I'm not yet ready to ditch my brakes George as the work on the car has been deferred owing to house renovations.
When I do have the cash to do the work I'll let you know if the brakes are available. They're the 928 S4 type.
I've only been to the 'Ring once - a long weekend with a bunch of northern petrolheads. All I can say is "awesome" - it's gotta be the "Everest of tracks!"
We went last October in my brother's 2002 Mini Cooper S - an awesome car (240 bhp GTT/Hartge engine, Quaife diff, light flywheel, Tarox 10-pot brakes, rose-jointed upper & lower control arms, powerflex bushes, Alta & Eibach anti-roll bars, rose-jointed drop links, camber plates, Bilstein PSS9 coilovers, 18" OZ Racing Superleggaras,Yokohama Parada Spec 2 215/35/18s, oil cooler, scorpion exhaust manifold to tail pipe, etc).
My brother returned to NZ with the Cooper S, an ex-Luxembourg LHD 1981 Ur-quattro (70,000 miles from new!) & a 1989 944 Turbo. His Mini may make the track out there when he gets his life sorted. Unfortunately we both suffer from the same affliction - an illness known as "Lindsey-itis" - only known to be treatable by one specialist - "Dr Dave" Lindsey!
The motorsport scene in NZ stikes me as a great one - friendly & with a wonderfully eclectic mix of cars in each field: Italian exotics, British & European classics, American & Aussie muscle, late Japanese, budget & upmarket european etc.
In the UK there are a lot of "cheque-book charlies" - low on skill & experience but armed with plenty of cash & the most exotic machine! The number of new "exotics" in the scrap yards here would make an enthusiast weep! Often it's a case of too much money & not enough sense.
I've plans for my car - but the house must come first - but that won't stop me doing the research & gathering advice from good people like yourselves.
Thanks,
Tim
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