Building a rear diffuser?

[CRead01]

my rear diff. is alluminum bent around the gas tank carbon fiber rivited on with L angle. there are pics in my pt garage
https://www.pro-touring.com/forum/vb...?do=view&g=566

this car is sick...

[Bjkadron]

gonein67bird: What does it attach to in the front? I can't really tell.

[MCMLXIX]

[Procharmo]

Rear diffusers work , there's no doubt about that. But if you look under a Porsche 911 996, 997 or Ferrari 430 you will see that the smooth under body and front air dam create more down force. If a diffuser is used it's the finishing piece. That is to say it may be inefficient on its own but will gain efficiency when combined with the under body tray and air dam...

The aim is to have low pressure under the car so if your muscle car has headers, sump, gearbox, mufflers and pipes you will have high pressure.... Just a thought.....

[Motorcitydak]

I want to smooth out the entire under side of my car, leaving the frame open to use for jack access. I am planning on mounting the panels flush with that. The exhaust may be a problem here with heat build up, I am not sure what to do about that but its a long way off. For material, I am still unsure too, maybe .25 UHMW?

[CamaroAJ]

build it like a vette, exhaust down the middle. oval pipe welded together right under the drive shaft. i plan on building removabele panels with louvers to help pull heat out when driving but leaving the exhaust open in the middle. with a front splitter and rear defuser.

[Bjkadron]

Yes... But what does it bolt to? A fuel tank strap?

[Rod]

what is that at the top of the tank?? between the tank and trunk floor?? spray foam??

[Motorcitydak]

Looks like the 'great stuff' expanding foam. He probably had problems with the gas tank rattling and squirted that stuff in there to make it a little bit more solid and stop making noise

[MCMLXIX]

That foam hold in moisture and will promote rust... please find another solution....

[gonein67bird]

drilled a hole in the L-angle slid it over the bolt that the gas tank strap attaches to and ran another nut over it.Yes that is spray foam, had a horible thud sound when I hit a big bump so I tried the foam. It was the exhaust hitting the rear end though, I nedd to dig that out of there.

[Bjkadron]

drilled a hole in the L-angle slid it over the bolt that the gas tank strap attaches to and ran another nut over it.Yes that is spray foam, had a horible thud sound when I hit a big bump so I tried the foam. It was the exhaust hitting the rear end though, I nedd to dig that out of there.

Ahhh! I see, thanks.