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Cayman Tires & WheelsDiscussion of Tires, Wheels, Suspension, etc.
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Walter Rohrl, who is well known for doing lots of track testing of Porsches, has said that maximum performance from the Cayman is obtained on 19" wheels (with PASM). However, he also said that many drivers will prefer 18" wheels, which are said to provide more road feedback.
FWIW I have 19" wheels with PASM. When I test drove a CS with 18" wheels but no PASM, the handling didn't feel as sharp to me. I thought both setups provided good road feedback, however, for street driving.
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
__________________
John
'07 Cayman S
'89 944 Turbo - sold
'05 Saab 9-5 Aero
I own one of each. On stock suspension, it is the tires and tire pressures more than the wheels. Different Tires have spring rates. But with 19" rims you will generally have a stiffer felling suspension, less body roll and less tire side wall roll.
In typical US roads I prefer 18". The 19" rims take a beating from the lack of proper road maintenance. The only thing you can do is to keep the pressures higher to protect the rims from damage.
__________________ CaymanS Track Videos 2004 996GT3 / 2007 CaymanS / 2008 SLK350 / 2007 Cayman S Track Car (Modified with parts from: 997GT3, 996GT3, 997GT3RS, Porsche Motorsport, Tarrett, Mantis, Arlan, AP Racing, Moton, Eibach, Tubi, Aasco, Sharkwerks, Quaife, TC Design, Heigo, Fikse, Softronic, TeamTech, Traqmate, SVtek, ChaseCam, Pagid, Rennline, Hooiser, Motul) Complete Mod List and Setup Info
19's are great for smooth surfaces. Sure, they provide maximum performance. However, for 99% of drivers out there and 95% of road surfaces, I've been lead to believe that 18's are the better choice.
Re: choosing 18's:
1) They get up to temp easier for the most drivers (e.g. driving "at the limit")
2) They are more compliant (e.g. road surface)
3) They are more forgiving (e.g. driver ability)
Of course, I'm really referring to hard driving. That is a track focus. The twisties have the same impact. And, you are more likely to see road imperfections on public roads (echo Glenn's "beating" comments...).
For street use, if I see 19's on a Cayman I assume "all show and no go." :-)
19's are great for smooth surfaces. Sure, they provide maximum performance. However, for 99% of drivers out there and 95% of road surfaces, I've been lead to believe that 18's are the better choice.
Re: choosing 18's:
1) They get up to temp easier for the most drivers (e.g. driving "at the limit")
2) They are more compliant (e.g. road surface)
3) They are more forgiving (e.g. driver ability)
Of course, I'm really referring to hard driving. That is a track focus. The twisties have the same impact. And, you are more likely to see road imperfections on public roads (echo Glenn's "beating" comments...).
For street use, if I see 19's on a Cayman I assume "all show and no go." :-)
4) more tire choices
5) tires are generally cheaper
6) wheels are generally lighter
I can tell you that the ride quality on 19" wheels with PASM is quite comfortable, at least compared to other sports cars (like my old 944 Turbo S with the M030 suspension). I guess it depends on what you are used to. I have not tried 19" wheels on a Cayman without PASM, however. With PASM, I would say that the ride quality even in "sport" mode is quite acceptable to me 90% of the time on Boston area roads, which get beat up badly every winter. PASM does a wonderful job of taking the edge off sharp bumps. The very stiff body structure also helps. In "normal" mode, the ride quality can even feel a bit soft at times.
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
__________________
John
'07 Cayman S
'89 944 Turbo - sold
'05 Saab 9-5 Aero
For street use, if I see 19's on a Cayman I assume "all show and no go." :-)
Hmmmmmmm, I was once told by a very wise person to never assume anything.
I'm not particularly offended, but I did win my class in the national autocross at the Porsche Parade in San Diego last summer - and was actually 41st fastest out of 480-some cars, including many, many on race tires - on OEM Michelin PS2s on OEM 19" Sport design wheels. I guess you could say that's "more go than show..."
brad
__________________
21-year PCA Member
PCA DE Instructor
