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From Car and Driver's Review (compared with a Z4 M):
"The Cayman S rang in at 4.8 seconds to 60 and posted a slightly quicker quarter-mile time of 13.3 seconds at 107 mph on its way to an ungoverned top speed of 166 mph."
From Car and Driver's Review (compared with a Z4 M):
"The Cayman S rang in at 4.8 seconds to 60 and posted a slightly quicker quarter-mile time of 13.3 seconds at 107 mph on its way to an ungoverned top speed of 166 mph."
I can't believe those numbers. Trap speed of 107 would imply wheel hp of over 300.
The Cayman has excellent aerodynamics, and a low frontal area. It achieves higher trap speeds than, say, an Impala with the same horsepower and weight. Also, the Cayman has a relatively flat torque curve, allowing it to stay close to maximum power over an unusually wide rpm range. This also contributes to higher trap speeds. If you'll take a look at the Caymanclub faq, you'll find that many, many testers have recorded trap speeds in the 105-107 mph range. Perhaps you should question your assumptions instead of the independent test data acquired by many competent parties.
Regarding the Cayman's power, Porsche's tolerance band is 295 HP +5%/-0%. So the actual power could be anywhere from 295 HP to 310 HP.
Last edited by Fort Felker; 06-10-2008 at 06:06 AM.
The Cayman has excellent aerodynamics, and a low frontal area. It achieves higher trap speeds that, say, an Impala with the same horsepower and weight. Also, the Cayman has a relatively flat torque curve, allowing it to stay close to maximum power over an unusually wide rpm range. This also contributes to higher trap speeds. If you'll take a look at the Caymanclub faq, you find that many, many testers have recorded trap speeds in the 105-107 mph range. Perhaps you should question your assumptions instead of the independent test data acquired by many competent parties.
Regarding the Cayman's power, Porsche's tolerance band is 295 HP +5%/-0%. So the actual power could be anywhere from 295 HP to 310 HP.
Precisely, I question my assumption by testing it using my own car. I am getting consistent trap speed of 99-100mph, which is equivalent to wheel hp of 250 or thereabout. And after assuming 20% loss, implied crank hp is 310-315hp thereabout. These figures are consistent with spec sheet number +/-5%.
Precisely, I question my assumption by testing it using my own car. I am getting consistent trap speed of 99-100mph, which is equivalent to wheel hp of 250 or thereabout.
The Caymanclub faq cites approximately 10 independent, professional road tests that achieved trap speeds of 104-107. And you got 99-100. I conclude that there is something wrong with your car or your testing, as no authoritative source has measured speeds as low as yours. You, of course can conclude whatever you want.
Quote:
Originally Posted by titanic
And after assuming 20% loss, implied crank hp is 310-315hp thereabout.
20% loss??? Where did that come from? It looks like another unsubstantiated assumption to me. Do you have any data at all that supports that figure? Sheesh...
I believe the fact that it is an automatic will contribute to the difference.
Quote:
Originally Posted by titanic
Precisely, I question my assumption by testing it using my own car. I am getting consistent trap speed of 99-100mph, which is equivalent to wheel hp of 250 or thereabout. And after assuming 20% loss, implied crank hp is 310-315hp thereabout. These figures are consistent with spec sheet number +/-5%.
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