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I took my car to Imagine Auto today for a dyno run that was postponed from last weekend. My goal was to see what the Cayman S generates at the wheels in completely stock form. I have 1950 miles on my car as of this dyno run and no modifications whatsoever. The car was run on a Mustang dyno with all of the latest software, this is a very expensive and accurate dyno as it has 4 wheel capability as well. The sport mode was NOT engaged because the dash started throwing up blinking lights because the front wheels don't move while the back wheels are rotating, ABS doesn't like it either but tough, the goal was to see how the car would do in stock form.
The Cayman S did NOT disappoint, in fact I was very pleased with the results shown in this following graph:
The car turned out 269 horsepower at the rear wheels and 225 foot/lbs of torque. Outstanding for a car that is only supposed to have 295 hp at the crank. In fact if you do the usual 15% loss factors and multiply that would give 316 hp and 265 foot/lbs of torque. So it appears that we may have some 'Free' horsepower from the factory and that the 295 HP number is nothing other than a 'marketing' number and not necessarily the 'true' horsepower number from Porsche.
Their shop is in Overland Park, KS which I think is at around 1,000 feet above sea level, but the dyno is supposed to compensate for ambient temperatures, pressure and altitude given the computer software that is used. Pump gas in our area is either 91 or 92 octane, there is no 93 octane to be found. Windows were down, air restrictor still in place, no side fan used to blow air towards intake only a large fan in front of the car to blow air across the radiators. Car had just been driven for about 90 minutes prior to taking it to their place and having the tests done.
That is what I have estimated also, around 265 WHP on Dyno dynamics. It could also be that there is a low loss factor. Instead of 15% it might be 10%. Some shops here in SF dynoed a n/a 996 and it only has 10%loss.
I forgot to mention there were 2 runs done, the first was 267 hp the second 269, so it was pretty consistent as well.
Even at only a 10% loss that's 298 HP projected at the crank, so true there is no way to know without taking the engine out and bench testing it, but at a minimum the HP is what the factory says, and likely a little more, so I'm not complaining. If the rear wheel number was 245 I'd be complaining. [img]/fckeditor/editor/images/smiley/MWPX/tounge_smile.gif[/img]
While no where near as accurate as the dyno, the following might be of interest. It was generated by a precision acclerometer (sp?). I kind of like the 0-60 time.
That is good to hear! Thanks for sharing the info. I just went out and took my car for a run, and I could feel the difference immediately (in my mind). [img]/fckeditor/editor/images/smiley/MWPX/drive.gif[/img]
I am glad to see some 'hard' evidence. As Porsche is generally conservative, it isn't surprising. Further, I was at the dealership last Saturday and was told that the car actually produces 300hp and that the gas mileage will increase the more you drive, giving the rings a chance to fully seat. And, wouldn't you know it, I'm getting in the 19MPG range now, whereas I was getting in the 17MPG range.
Thanks for posting the results!!!! Great job!!!
Edited by - fmarshall on 04/06/2006 4:09:24 PM
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Cayman S - a portable amusement park
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