Rohr 1996 Porsche 911 GT1, diffuser, tail lamps spoiler

            The "diffuser" is the black tray at the bottom that smoothly expands the airspace under the car from the close fit from car to road, between the axles, to a height chosen to give maximum downforce for minimum drag, in concert with other aerodynamic features. In some racing cars, the airflow at full speed as much as triples the force exerted by weight alone on the tires. The tires can only accelerate a car forward (via engine) or back (via brakes), or from side to side by steering, up to basically the same acceleration that applies the tires to the road. Push it down with the airflow and you can turn sharper, brake harder or accelerate faster. Nice trick.
Even better, with reasonable aerodynamics, 7 to 10 units of down force cost only 1 unit of drag - that's called the lift to drag ratio, even if the lift is upside down.

Note "T" pin holding the body to the chassis.

As you can see above the tail-light, one-piece back-of-the-car is carbon-fiber composite, as is the undertray. The only metal here are the exhaust pipes, the red-painted pickup loop bolted to the transmission, the "T" pin, its keeper, assorted fasteners. and a piece of black painted steel strip forming the basket inside the pick-up loop, where the breather catch tank nestles. That tank, both vent hoses, all the body work, are all plastic parts. The tail lamps are stock 993 items.

DSC_0165

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Taken in: United States / California / Corral de Tierra (show map)

Taken on: October 15, 2011

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Camera: Nikon D40X, f/5.6, 1/80 sec, 55mm (=82mm), ISO 200 (more info) (hide info)

Camera:	Nikon D40X
Aperture:	f/5.6
Exposure Time:	0.013 sec (1/80)
Focal Length:	55mm (35mm equivalent: 82mm)
ISO:	200
Exposure Bias:	0 EV
Flash:	No Flash
Exposure Program:	Not Defined
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	Ver.1.00
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