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The mkiv Supra Owners Club

Top Secret Rear Diffuser


Nic
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I was having a look at a highly modified, supercharged NSX today, it was a road going JGTC replica, in bright orange, based on the Autobacs car. Really did look stunning especially from the back with the carbon fibre GT wing and rear diffuser.

 

Top Secret are now doing a CF rear diffuser for the Supra, I was just wondering if this would have any functional benefit? Not my cup of tea for a road car, but could look good on a modified, kitted Supra.

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Doesnt the diffuser speed up the air exiting the underside of the car which 'sucks' the rear of the car to the road...giving it more downforce.

 

Though I think it only really benefits you if the underside of the car is pretty flat (for smoother air flow).

 

Im sure I heard Tiff Needle say something like that on 5th gear, or was it clarkson on Top Gear when he tested the red Audi S4?

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Doesnt the diffuser speed up the air exiting the underside of the car which 'sucks' the rear of the car to the road...giving it more downforce.

 

Though I think it only really benefits you if the underside of the car is pretty flat (for smoother air flow).

 

Im sure I heard Tiff Needle say something like that on 5th gear, or was it clarkson on Top Gear when he tested the red Audi S4?

 

Correct.

 

Rear deffusers, if designed correctly, are there to to clean up turbulant air exisiting from the back of the car and promote faster flow. The faster the flow under a car the lower the air pressure will be and therefore aide downforce.

Great concept, not sure how efficient it would be on a supra from anything other than cosmetics. Ideal world would have the supra with a flat bottom in combination with this as generaly having a 4" exhaust hanging under there isn't the best for flow. I'm sure it does work to an extent just not as efficiently as it could do if combined with flat panage.

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Doesnt the diffuser speed up the air exiting the underside of the car which 'sucks' the rear of the car to the road...giving it more downforce.

 

Though I think it only really benefits you if the underside of the car is pretty flat (for smoother air flow).

 

Im sure I heard Tiff Needle say something like that on 5th gear, or was it clarkson on Top Gear when he tested the red Audi S4?

 

It was Tiff. He also thought an Esprit would do 200mph in under 10,000 feet- a standard Esprit V8 manages 165mph in the same distance btw.

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Depends how fast , how heavy the rain and how efficient it is at it's job, BUT a simple answer yes. You only have to watch a series like F1 or GT that uses this technology to the max when racing in the rain. Usualy all you see the break light.

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