OT: Cayman GT4
10-20-2014, 09:21 PM
#406
Race Director
For personal reasons I was checking the wheelbase of the Cayman hoping it was shorter then the GT3 as this could provide a glimmer of hope that maybe that car would fit into my garage more easily. I was surprised to see that the Cayman actually has a half inch longer wheelbase than the 991!! I'm assuming the front and rear overhang's are less?
Any speculation over whether this car would be available with a front lift kit? Did the Cayman R have a front lift?
Any speculation over whether this car would be available with a front lift kit? Did the Cayman R have a front lift?
10-20-2014, 09:24 PM
#407
Race Director
4.6 Rear-axle steering
General
The new 911 GT3 features rear-axle steering as standard. The system comprises
two electromechanical actuators, which are used instead of the conventional toe
control arms at the left and right of the rear axle. The system steers the rear axle,
depending on the speed, within a range of approximately +/- 1.5 degrees in the
opposite direction to or in the same direction as the steering angle on the front
axle. The steering angle on the rear axle thus depends above all on the steering
angle on the front axle, the driving situation and the driving speed.
At speeds of up to approximately 30 mph (50 km/h), the system steers the rear
wheels in the opposite direction (counter) to the front wheels. In terms of geometry,
this results in a virtual shortening of the wheelbase by approximately 5.9 in. (150
mm) and ensures both greater agility and day-to-day usability. This facilitates maneuvering
and parking and keeps the turning circle small despite the large track width
on the front axle.
At speeds of over approximately 50 mph (80 km/h), the system steers the rear
wheels parallel to the front wheels (same direction). In terms of geometry, this
results in virtual lengthening of the wheelbase by approximately 18.7 in. (500 mm)
and increases driving stability, particularly at high speeds. At speeds of between 30
and 50 mph (50 and 80 km/h), the system continually switches between steering in
the same and opposite direction, depending on the driving situation.
10-20-2014, 09:35 PM
#411
Rennlist Member
For personal reasons I was checking the wheelbase of the Cayman hoping it was shorter then the GT3 as this could provide a glimmer of hope that maybe that car would fit into my garage more easily. I was surprised to see that the Cayman actually has a half inch longer wheelbase than the 991!! I'm assuming the front and rear overhang's are less?
Any speculation over whether this car would be available with a front lift kit? Did the Cayman R have a front lift?
Any speculation over whether this car would be available with a front lift kit? Did the Cayman R have a front lift?
The 987 and 981 have longer wheelbases and shorter rear overhangs than their 911 counterparts due to placement of their engines...
10-21-2014, 12:11 AM
#412
Race Director
Neither the Spyder nor Cayman R had front lifts, but they didn't need them, either...much larger arrival angle than on a GT3...they don't have the long, low front splitter. The 987 and 981 have longer wheelbases and shorter rear overhangs than their 911 counterparts due to placement of their engines...
10-21-2014, 11:50 AM
#413
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Cayman wheelbase has always been longer than its 911 brother's. When we go from 997.2 to 987.2 on the alignment pad and following races, the scales need to be move to accommodate the Cayman's longer wheelbase.
10-21-2014, 12:42 PM
#414
Rennlist Member
Edit: just checked, the cayman GTS is about .7" longer.
10-21-2014, 01:06 PM
#415
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Yes. Speaking 981 vs. 991, the Cayman is 1" longer in wheelbase while the 991 is about 4" longer in overall length due to body overhang. Widthwise, the Cayman is almost as wide as a 991 up front but an entire 1" wider on rear track. The 991 GT3 has the wider rear track however so that is how they lay out from a dimension perspective.
10-21-2014, 03:21 PM
#417
Race Director
Don't shoot me if this has already been posted. Here are some spy shots from Autocar. http://www.autocar.co.uk/car-news/sc...rototype-spied
Wheels are beautiful, pity there is no concavity in the rear ones. Wish the mirrors weren't stock cayman items.. And can't wait to see what rear spoiler actually looks like. Overall though it looks very purposeful and aggressive.
10-21-2014, 03:56 PM
#418
Addict
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10-21-2014, 04:15 PM
#420
Three Wheelin'
Yes. Speaking 981 vs. 991, the Cayman is 1" longer in wheelbase while the 991 is about 4" longer in overall length due to body overhang. Widthwise, the Cayman is almost as wide as a 991 up front but an entire 1" wider on rear track. The 991 GT3 has the wider rear track however so that is how they lay out from a dimension perspective.
Allan, from Porsche Technical info:
4.6 Rear-axle steering
General
The new 911 GT3 features rear-axle steering as standard. The system comprises
two electromechanical actuators, which are used instead of the conventional toe
control arms at the left and right of the rear axle. The system steers the rear axle,
depending on the speed, within a range of approximately +/- 1.5 degrees in the
opposite direction to or in the same direction as the steering angle on the front
axle. The steering angle on the rear axle thus depends above all on the steering
angle on the front axle, the driving situation and the driving speed.
At speeds of up to approximately 30 mph (50 km/h), the system steers the rear
wheels in the opposite direction (counter) to the front wheels. In terms of geometry,
this results in a virtual shortening of the wheelbase by approximately 5.9 in. (150
mm) and ensures both greater agility and day-to-day usability. This facilitates maneuvering
and parking and keeps the turning circle small despite the large track width
on the front axle.
At speeds of over approximately 50 mph (80 km/h), the system steers the rear
wheels parallel to the front wheels (same direction). In terms of geometry, this
results in virtual lengthening of the wheelbase by approximately 18.7 in. (500 mm)
and increases driving stability, particularly at high speeds. At speeds of between 30
and 50 mph (50 and 80 km/h), the system continually switches between steering in
the same and opposite direction, depending on the driving situation.
4.6 Rear-axle steering
General
The new 911 GT3 features rear-axle steering as standard. The system comprises
two electromechanical actuators, which are used instead of the conventional toe
control arms at the left and right of the rear axle. The system steers the rear axle,
depending on the speed, within a range of approximately +/- 1.5 degrees in the
opposite direction to or in the same direction as the steering angle on the front
axle. The steering angle on the rear axle thus depends above all on the steering
angle on the front axle, the driving situation and the driving speed.
At speeds of up to approximately 30 mph (50 km/h), the system steers the rear
wheels in the opposite direction (counter) to the front wheels. In terms of geometry,
this results in a virtual shortening of the wheelbase by approximately 5.9 in. (150
mm) and ensures both greater agility and day-to-day usability. This facilitates maneuvering
and parking and keeps the turning circle small despite the large track width
on the front axle.
At speeds of over approximately 50 mph (80 km/h), the system steers the rear
wheels parallel to the front wheels (same direction). In terms of geometry, this
results in virtual lengthening of the wheelbase by approximately 18.7 in. (500 mm)
and increases driving stability, particularly at high speeds. At speeds of between 30
and 50 mph (50 and 80 km/h), the system continually switches between steering in
the same and opposite direction, depending on the driving situation.
