992 GT3 / GT4RS Underbody Aero...
#16
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
My understanding is that they redirect the turbulent air from the front tires out to the sides so there will be cleaner air to feed the rear diffuser. Since the 997 doesn't even have an engine undertray much less a rear diffuser, these parts have little use on our cars.
#17
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Again… I have no idea what I’m talking about, I just regurgitate google.
Last edited by Wonderdan; 11-28-2022 at 10:20 PM.
#18
Instructor
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Difficult to answer with no data but as an aero engineer my assumption would be...
Obviously they remove some of the air from beneath the car which is always an advantage but my technical thoughts are, the air they direct will create an air curtain along the sill lower sill / door area which helps stop high pressure air sliding under the car at speed I.e. Increasing lift.
Similar to fitting blade style side skirts, they don't necessarily add downforce they just reduce lift.
Ultimately, there physically has to be an advantage to them, we'll never know exactly what, unless someone has a cfd model and we can add them in, my strategy was to do some laps before and after, more stability = win, for 100 dollars I don't think you can loose, assuming they fit.
Plan B is get some 3d printed to fit...
Obviously they remove some of the air from beneath the car which is always an advantage but my technical thoughts are, the air they direct will create an air curtain along the sill lower sill / door area which helps stop high pressure air sliding under the car at speed I.e. Increasing lift.
Similar to fitting blade style side skirts, they don't necessarily add downforce they just reduce lift.
Ultimately, there physically has to be an advantage to them, we'll never know exactly what, unless someone has a cfd model and we can add them in, my strategy was to do some laps before and after, more stability = win, for 100 dollars I don't think you can loose, assuming they fit.
Plan B is get some 3d printed to fit...