How much downforce do you think gives the original rear spoiler of an 997S at high speed?

does it works or is only for cooling and good looking?

 

from my understanding from Porsche dealers that this actually adds down force. as far as to how much, that will be hard to get it out of them. Because for all we know is they are saying it and they will not provide theoritical data to us or at least to my knowledge. anyway, i am sure someone will chime in with some good data etc. I myself would like to know.

 

Here is an excerpt out of the 2005 service information introduction book...

"Similar to the previous 911 Carrera (996) the rear engine lid is made from sheet metal steel. Its styling has been adapted to the new body design. The integrated rear spoiler has also been restyled. The spoiler extends at 75 mph(120 km/h) to reduce lift coefficients a the rear axle, thereby increasing driving stability.
Since aerodynamic forces are rather less important at low speeds, it retracts at speeds below 38 mph (60km/h) as a function of the engine compartment temperature. The logo on the rear lid of the 911 Carrera/S is finished in titanium."

Engine Compartment Temp.....................Spoiler Action ................997.............. 996

Cold (<189 F) ......................................Extended ....................75mph........... 75mph
.................................................. .......Retracted ....................38mph........... 38mph

Warm (>190 F) .....................................Extended ....................50mph............ 75mph
.................................................. ........Retracted................... 19mph............. 38mph

 

Thank you Porschespeeddem!!
That is very interesting...I knew the lid was open at 120 Km/h but nothing more...

 

Mine seems to open a little later than that. Maybe at 78.