These vanes on the lower control arm are turning vanes to assist the under-car vanes at the back of the wheel well.
The front brakes have very elaborate ducting that directs cooling air over the caliper and into the hat where it feeds the vanes of the rotor.
The front diffusers feeding into the wheel well are adjustable and you can actually tune the aero balance with the rear wing angle and these front diffuser reverse gurney flaps.
You can see the adjustment holes for the flaps here. To our knowledge, no other production street car has adjustable front aero like this!
3 comments
“Apparently, Porsche found that direct-injected engines make particulates like a diesel. We assume that the car probably has some sort of regeneration cycle to clean the traps that makes a lot of heat, hence this metal-lined scoop.”
Dfi engines do create fine particules. It’s mendatory in Europe now to have a GPF on all engines. The only difference is EU spec cars (for PORSCHE) have a differential pressure sensor, US cars do not.
The normal regen cycle on gasoline engines takes place when you’re coasting, it’s the only time where a gasoline engine has enough oxygen in the exhaust to burn the particules.
There is also a forced regen mode. I’m not sure but I think it uses secondary air injection to get oxygen in the exhaust. Porsche informs that it must be performed with a lot or airflow passing under the car because with the car stationnary, the red hot GPF could potentially damage the road it’s on (and everything around it).
I really like the diffuser to brake scoop design.
My theory on the move to SLA double wishbone front is that the Cayman was posing a serious track threat and they needed to further differentiate the cars with a significant suspension upgrade on the 911.
Also, they could finally put the real GT3 engine in the Cayman GT4 RS without actually eclipsing the 992 911 GT3.
Great article. Would have been great to get some more zoomed out overall photos of the underside to understand how much of the floor is flat bottomed. The number of aero details is staggering