1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Rear Diffuser?

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Old 02-10-15, 09:49 AM
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Question Rear Diffuser?

Does any one know of a company making Rear Diffusers for Fb's?

Looking for something similar to : http://photo.qip.ru/photo/overlord82.../179142280.jpg

Or even one for a different car that may fit with slight modifications?

Looking to beef up the look of the rear end but havent been able to find a bumper cover to my liking.

Thanks
Old 02-10-15, 10:51 AM
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Hope to find a company myself. Seems most body mods have to be custom made for 1st gens
Old 02-10-15, 03:40 PM
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I'm planning on making rear diffusers for our FB's in the near future. There's a huge hole in the market there that no one has filled yet. It'll mount to the bottom side of the stock fender quarters and maybe the rear fender skirt as well - have yet to design and test mount my idea yet. It'll be a while before I actually make a mold and start making some though.
Old 03-17-17, 06:18 PM
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I was curious if you ever ended up designing and test mounting your idea, DreamInRotary? I have an FB road racing car that I have been looking at doing something like this for.
Old 03-20-17, 05:55 AM
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hello !

i have one it's sagging a little bit in the middle still (ive since made it sag less with a center mount but this is the only pic i have of it ATM)
the gas tank is in a bad spot for us folks wanting one lol
Attached Thumbnails Rear Diffuser?-diffuser.jpg  
Old 03-20-17, 07:44 AM
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A diffuser alone doesn't buy you much unless you have the air handling up front and
under the car done correctly as well. Also, unless you are going ~100 mph or over, none of this
really has an effect on the handling of the car, except to add weight. So I don't understand the
need for this from a performance perspective.
Old 03-20-17, 03:46 PM
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Originally Posted by t_g_farrell
A diffuser alone doesn't buy you much unless you have the air handling up front and
under the car done correctly as well. Also, unless you are going ~100 mph or over, none of this
really has an effect on the handling of the car, except to add weight. So I don't understand the
need for this from a performance perspective.
Noticeable differences with a smooth underbody and diffuser on my daily driver, and highway MPG dives dramatically if I open up the front. So I'd say 50mph+ and you notice a difference.

Who isn't driving their car over 100mph?
Old 03-21-17, 04:58 PM
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Originally Posted by Sh00bs
hello !

i have one it's sagging a little bit in the middle still (ive since made it sag less with a center mount but this is the only pic i have of it ATM)
the gas tank is in a bad spot for us folks wanting one lol
Crazy exhaust tip placement. Pics of the inside routing, please.
Old 03-21-17, 06:31 PM
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Smooth underbody is key here. FB's don't have a smooth underbody, and we kinda can't with the solid rear axle, fuel tank, and drive shaft/trans tunnel.

If the bottom of the car was smooth and able to flow air sure why not, but its not smooth and able to flow air so why bother?

Making a rear diffuser on an FB cosmetic equipment that is race inspired.

Last edited by Qingdao; 03-21-17 at 06:33 PM.
Old 03-22-17, 08:20 AM
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I would love to see that inside routed exhaust. Looks crazy awesome.
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