Dealer claims Turbo wheel is lightest, but I've read otherwise here
#16
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Think inertia -- both translational and rotational. More mass means more inertia. The lower the inertia, the easier it is for the suspension to maintain tire contact with the road surface, especially a bumpy one. The rotational inertia is more of an issue in small, low powered cars.
#17
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Think inertia -- both translational and rotational. More mass means more inertia. The lower the inertia, the easier it is for the suspension to maintain tire contact with the road surface, especially a bumpy one. The rotational inertia is more of an issue in small, low powered cars.
#18
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B911S: You hit it right on the head. Well stated. I agree 100% with finding other ways to knock off some car weight rather than spending $5000 to save perhaps 20 pounds (if that is the main objective of spending the $5000).
#19
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One of the two main reasons Porsche has Ceramic disk brakes as an option. Lower rotational inertia and stable friction from high speeds and temperatures.
Forget the order of magnitude but isn't 5 pounds unsprung weight equivalent to 20 pounds of sprung weight?
Forget the order of magnitude but isn't 5 pounds unsprung weight equivalent to 20 pounds of sprung weight?
#20
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I understand and agree (being a mechanical/maniacal engineer) about the inertia thing. However, I still don't know how the theory of it translates into the experience of it. In a blind test, could the average driver distinguish between a set of Champions and a set of Sport Designs?
#21
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Think inertia -- both translational and rotational. More mass means more inertia. The lower the inertia, the easier it is for the suspension to maintain tire contact with the road surface, especially a bumpy one. The rotational inertia is more of an issue in small, low powered cars.
That being said I don't know how much weight change it will take to actually pass a seat of the pants test.
#22
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OK... there is a mountain being built out of a mole hill here....
1-if you take your car to the track and are a pro driver you will be able to tell the difference in some of the wheels weights.
2-If you are just going to the track for DE then you will not be able to tell..maybe can tell with many years of track time.
3-If you are just driving around on the street you will not be able to tell any difference so just get what looks the best to you.
1-if you take your car to the track and are a pro driver you will be able to tell the difference in some of the wheels weights.
2-If you are just going to the track for DE then you will not be able to tell..maybe can tell with many years of track time.
3-If you are just driving around on the street you will not be able to tell any difference so just get what looks the best to you.
#23
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It seems to me that the weight differences between the Porsche wheels is really nominal, and that if you are one who feels that wheel weight is truly important you should be looking after-maket rather than the relatively heavy Porsche wheels.
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OK... there is a mountain being built out of a mole hill here....
1-if you take your car to the track and are a pro driver you will be able to tell the difference in some of the wheels weights.
2-If you are just going to the track for DE then you will not be able to tell..maybe can tell with many years of track time.
3-If you are just driving around on the street you will not be able to tell any difference so just get what looks the best to you.
1-if you take your car to the track and are a pro driver you will be able to tell the difference in some of the wheels weights.
2-If you are just going to the track for DE then you will not be able to tell..maybe can tell with many years of track time.
3-If you are just driving around on the street you will not be able to tell any difference so just get what looks the best to you.
#25
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I have to say that I can feel the difference in having the PCCBs. Tires are extremely heavy in these sizes so the contribution of the wheel to all of this seems so minor. Here are the sizes again for this thread,--been saving them for awhile...
Porsche 997 Wheels
Porsche Factory Carrera S - 100 lbs, 0 oz.
8x19" 22 lbs. 4 oz.
11x19" 27 lbs. 12 oz.
Porsche Factory Carrera Classic - 104 lbs, 10 oz.
8x19" 23 lbs. 10 oz.
11x19" 28 lbs. 11 oz.
Porsche Factory Carrera Sport Design - 104 lbs, 12 oz.
8x19" 24 lbs. 3 oz.
11x19" 28 lbs. 3 oz.
Porsche Factory Carrera Sport - 106 lbs, 12 oz.
8.5x19" 24 lbs. 2 oz.
11.5x19" 29 lbs. 4 oz.
8x19 (987, 997 non turbo front) 23.4 pounds
8.5x19 (997 turbo front) 23.9 pounds
9.5x19 (987 rear) 25 pounds
11x19 (997 turbo rear) 28.8 pounds
Stock Turbo Wheels
8.5x19" 23 lbs. 8 oz
11x19" 27 lbs. 14 oz.
Factory 997 GT3
8.5x19" 24 lbs. 5 oz.
12x19" 30 lbs. 13 oz.
Tire Weights:
Potenza RE050A 24/32
ContiSporrtContact 2 21/29
Pilot Sport PS2 22/28
P Zero Rosso 22/28
Advan Sport 24/30
Porsche 997 Wheels
Porsche Factory Carrera S - 100 lbs, 0 oz.
8x19" 22 lbs. 4 oz.
11x19" 27 lbs. 12 oz.
Porsche Factory Carrera Classic - 104 lbs, 10 oz.
8x19" 23 lbs. 10 oz.
11x19" 28 lbs. 11 oz.
Porsche Factory Carrera Sport Design - 104 lbs, 12 oz.
8x19" 24 lbs. 3 oz.
11x19" 28 lbs. 3 oz.
Porsche Factory Carrera Sport - 106 lbs, 12 oz.
8.5x19" 24 lbs. 2 oz.
11.5x19" 29 lbs. 4 oz.
8x19 (987, 997 non turbo front) 23.4 pounds
8.5x19 (997 turbo front) 23.9 pounds
9.5x19 (987 rear) 25 pounds
11x19 (997 turbo rear) 28.8 pounds
Stock Turbo Wheels
8.5x19" 23 lbs. 8 oz
11x19" 27 lbs. 14 oz.
Factory 997 GT3
8.5x19" 24 lbs. 5 oz.
12x19" 30 lbs. 13 oz.
Tire Weights:
Potenza RE050A 24/32
ContiSporrtContact 2 21/29
Pilot Sport PS2 22/28
P Zero Rosso 22/28
Advan Sport 24/30