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Would you be able to use the suction effect of the aero to be able to pull air out of the engine bay? Id also think that you would want to have a true skirt along the side of the car (for racing) to be able to make sure that no air escapes out of the side.
Joe Toth has one for the Cayman, maybe you can talk him into doing something for our Turbos. I carry his parts now, they look fantastic.
Would you be able to use the suction effect of the aero to be able to pull air out of the engine bay?
Id also think that you would want to have a true skirt along the side of the car (for racing) to be able to make sure that no air escapes out of the side.
On the flat bottom you could add naca ducts to shoot air at the turbos.
The problem is our exhaust. You need an upward angle on the diffuser to make it functional. Our exhausts prohibit that. I'm having a custom center exit exhaust exiting through the license plate area made so I can get a proper diffuser on the car.
ideally you would want a curved upward part to get the most area possible for the air to expand but that will be tough given the fact that the rear bumper is flat with the engine. You dont want to lower the diffuser at all because that would cause the opposite of what you want to do. The only thought I had was that you could extend the diffuser a bit beyond the bumper so that you could add a small gurney flap to add some rise to it.
If you wanted to be hardcore about it, you could cut the heat shield and lower portion of the bumper to add the rise
I attach picture of the diffuser on the new 911R. I'm working on making something like that to work as a lower engine cover for my car, along with doing full flat floor (adding NACA ducts for areas that need cooling)...
I do like the idea of cutting the area between exhaust tips/under plate to give room to add more angle to diffuser, so perhaps that could be tied in with something like the 911R engine tray diffuser. I think the black trim at the bottom of the bumper can be completely done away with since it is non functional and at a minimum create something similar to the 997.2 GT2RS lower section.
To relieve some of the pressure built up in the engine bay by the NACA vents for cooling/help release some engine bay heat, I'm also considering adding vents in the rear bumper cover similar to the 997.2 or 991 GT3 cars, so since I've got to pick up a spare bumper cover anyway to see how that would look, maybe I will experiment with tying in a lower diffuser section also.
I've got a ton of aero ideas for my car that I am working on, just don't have enough time to sit down and hammer it all out in a timely manner.
The problem is our exhaust. You need an upward angle on the diffuser to make it functional. Our exhausts prohibit that. I'm having a custom center exit exhaust exiting through the license plate area made so I can get a proper diffuser on the car.
Sounds familiar. Lol. This is what I did on mine to get a diffuser in there.
ideally you would want a curved upward part to get the most area possible for the air to expand but that will be tough given the fact that the rear bumper is flat with the engine. You dont want to lower the diffuser at all because that would cause the opposite of what you want to do. The only thought I had was that you could extend the diffuser a bit beyond the bumper so that you could add a small gurney flap to add some rise to it.
If you wanted to be hardcore about it, you could cut the heat shield and lower portion of the bumper to add the rise
Most every diffuser I have seen has been angular instead of curved. No idea why, but the case nonetheless. Goldcrest Motorsports has a mold for some, and they do in fact curve, but again, wont work with our exhaust.
I attach picture of the diffuser on the new 911R. I'm working on making something like that to work as a lower engine cover for my car, along with doing full flat floor (adding NACA ducts for areas that need cooling)... I do like the idea of cutting the area between exhaust tips/under plate to give room to add more angle to diffuser, so perhaps that could be tied in with something like the 911R engine tray diffuser. I think the black trim at the bottom of the bumper can be completely done away with since it is non functional and at a minimum create something similar to the 997.2 GT2RS lower section. To relieve some of the pressure built up in the engine bay by the NACA vents for cooling/help release some engine bay heat, I'm also considering adding vents in the rear bumper cover similar to the 997.2 or 991 GT3 cars, so since I've got to pick up a spare bumper cover anyway to see how that would look, maybe I will experiment with tying in a lower diffuser section also. I've got a ton of aero ideas for my car that I am working on, just don't have enough time to sit down and hammer it all out in a timely manner.
interesting thoughts. Careful on a full cover below the motor, the fan in the lid blows air down over the motor and out the bottom to cool the turbos, but mainly to keep the top side of the engine from baking.
Most every diffuser I have seen has been angular instead of curved. No idea why, but the case nonetheless. Goldcrest Motorsports has a mold for some, and they do in fact curve, but again, wont work with our exhaust.
Its definitely easier to fabricate an angular piece but a curved section as I (poorly) drew is what the F1 cars use in their diffusers. The idea is that the larger the area you can create sooner, the better the effect will be of speeding up the air. That is also where I got the idea of extending it a bit beyond the bumper and adding the gurney flap. It angles the air more at the edge which gives more room to disperse.
Oh the fun I would have if I was rich and had a wind tunnel to play with.
Next winter I'll be working on adding this style diffuser to my car. It's designed for the 997 but with some work I'll get it to fit the 996 well. May have to mod the exhaust a bit more as well.
I would like that piece for mine, just for the fact I run straight pipes so I have a huge opening where the exhaust used to be. IM sure its like a parachute back there
