Menu toggle

D90 differences .... why?

BMW went through a phase recently where some of their wheels had to be replaced due to distortion damage on the inner edge, the inner edge has much less support than the outer edge so is more susceptible to pothole etc damage. When I first left school I worked as a paint sprayer for a few months, the ovens there were certainly hotter than a summer day, perhaps this was to cure the paint faster. Stripping, machining, heating and cooling alloy wheels in an uncontrolled process with no consideration for their metallurgical structure is flying in the dark IMO.
 
Not much, really. They are about 200 grammes lighter than the forged Fuchs Disc wheels that they were developed from. The downside is that the Disc/Gullydeckel wheel is far stronger and not prone to failure. The CS wheel went too far.
 
I drove with both the CS and D90 on my turbo and although there was a difference I may not mention which felt best since the tyres were quite different, so can't make a straight comparison at this point.
 

ORIGINAL: JagdHamster

Is there much of a weight advantage with CSes?
Click to expand...

If you're Lewis Hamilton, then possibly. In the real world taking the spare wheel out and giving up beer for a week would make as much difference. [&:]
 
From a carried weight perspective I agree, but it isn't the kerb weight that matters. Small (in that context) differences in wheel weight make a massive difference when the wheel is spinning at 800rpm.
 
Can't comment what Lewis can feel, but I got the S2 with D90s and had it like lhat for a couple of weeks, then put my gullies on and there is a definite difference, how much down to the different tyres I don't know but the D90s had Contis, the Gullies Khumos.
Weight difference between fronts both 7" rims with tyres as above - D90 17.4kg Gullie 14.7kg, I only weighted them because they felt so different as I was swapping them over.
 

ORIGINAL: A9XXC

Can't comment what Lewis can feel, but I got the S2 with D90s and had it like lhat for a couple of weeks, then put my gullies on and there is a definite difference, how much down to the different tyres I don't know but the D90s had Contis, the Gullies Khumos.
Weight difference between fronts both 7" rims with tyres as above - D90 17.4kg Gullie 14.7kg, I only weighted them because they felt so different as I was swapping them over.
Click to expand...



I'd suggest the difference you felt on a 25-year-old car was more down to the tyres?

I can't believe that a total weight reduction of 13kg over all 4 wheels makes the slightest bit of difference to how a standard 944 drives on the road.

I'm prepared to be shot down here, but I'd say that decent tyres, the correct pressures, and a proper geo set-up would make far more difference than the wheel type? [:)]

 
I believe that it was the tyres too Mike (and so does the fellow who bought your old 2.7l car too). They were really, really terrible tyres! I saw them in October when I collected the sports seats from his series one car.
 
Weight does make a massive difference to how a car 'drives', for the reason explained above. The heavier the wheel & tyre the greater the gyroscopic stability, which meanns that it is harder to turn the wheels from straight ahead.
 
I think Simon meant to say "non-suspended" weight makes a massive difference [:)]

I can feel the extra weight of the 17" wheels (Cup 2) since they replaced the CS on my turbo. If it wasn't for security reasons I would go back to the lighter 16" in a heart beat.
 
Sorry for lack of clarity. I mean that a larger heavier wheel is far, far more difficult to turn. Try holding a small cycle wheel on its spindle, which has been spun quickly and 'steer' it slightly - then try with a large mountain bike wheel. Its extremely difficult to turn as a result of the strong gyroscopic force.

 
Don't forget there can be a significant difference in tyre weights as well, even for the same size tyres.

Lighter wheels/tyres are very noticeable on a 944 - my S2 was very heavy on its 17" split rim wheels, and delightful on 16" cups. Ok that's a much bigger difference than D90 / CS wheels. My current wheels are about as light a 17" 8J Porsche wheel as you can get, and a reasonable compromise.
 

ORIGINAL: 944 man

Sorry for lack of clarity. I mean that a larger heavier wheel is far, far more difficult to turn. Try holding a small cycle wheel on its spindle, which has been spun quickly and 'steer' it slightly - then try with a large mountain bike wheel. Its extremely difficult to turn as a result of the strong gyroscopic force.
Click to expand...

You could say the same about bigger discs and calipers.
 
I can feel the difference clearly,suspension rides differently,clear as crystal,the D90s look great on a Bridge spoiler car though thats why i have put them back on my black car.CS wheels make the car feel way more nimble,this is not grip but the way it rides and steers,D90s just feel heavier and have more momentum when the suspension is working thats as best as i can explain what it feels like to me.
 
"D90s just feel heavier and have more momentum when the suspension is working thats as best as i can explain what it feels like to me."

Thats exactly it Mark.

I must admit I didn't look too closely at the tyres on my D90s as they were never going to stay on the car, but when I swapped wheels the car was certainly more lively as Mark says.
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top