Here we are for a little resume of what have been done to decrease the drag.
-I've already made (before Dijon) some modifications to decrease drag and lift putting an air shield behind the front grill. (For more details, click here)
But i've put the thing to an other level with an other air shield on the hole behind the front bumper. (picture later).
- Widening the fenders:
Behind the wheel arches is a very critical area where a huge amount of air is "trapped". In order to make room for the tires and to free this air, I've opened the fender and widened it from the body. You can see on the picture a little alloy plate in front the door mechanism in order to make the air leave this area more smoothly. It also allows the hot air from the oil cooler (click here for more details) to exits faster.
-The wiper wisher in vertical position.
So intstead of that abstract tuning art, I've made a little airdam.
-The middle part:
The only thing done on the middle part is the undertray.
I didn't want to put some side skirt, too visible to me, and such as i'm not looking for maximum downforce, it's not that important.
The diffuser is one of the most visible mod but also the one absolutly necessary to complet the underside of the car. In order to decrease the drag, i've choose a smooth angle.
You can see on the pictures that the fines are attached with the minimum of rivets inside the diffuser, the air passing there has to be as free as possible. That's why the bracket mounts are betweet the diffuser and the chassis. And that's also why I had to modify the antiroll bar mounts, much higher than they were. It's so cool to work wood, it reminds me when I used to build scale air plane back in the days.
After adding the fins, and the mounting, i'll be happy to...
And it's now painted in black !
I can't really quantify the benefits of theses mods but, the cooling is much more efficient. Even with the straight pipe exhaust the car is much much much quieter than before while I'm driving to the track. On straights the car reaches more easily its top speed. On fast corners even with a more "mobil" rear geometry setup I feel very confident and I can put the car almost everywhere I want giving me this strange feeling "I could go in this corner way faster". In that way, I think all this stuff is working very fine !
Here is a little GIF to show how the "spray" is now. (you can see how the side ex
haust smashes the flow out of the rear wheel wake as well).