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Airbox Mods

In message <01bd21f6$fad3d520$1392728d@rosebud> "Matt Howe" writes:

> Under this line of thinking, wouldn't it make
> sense that a large air intake which tapers through ducting and finally
> arrives at your intake manifold, be more dense due to the increased
> pressure, and therefore provide better combustion?  I may be totally
> misguided in this, but I would like to find out.  This thread has been
> interesting.

This effect is used on the BTCC A4.
However - it requires forward motion, so it's no use off the stop-light line.  
Also, the effect is comparatively small - you're relying on the inertia of the 
air gathered by your intake horn.  Air is light - not much inertia.  The horn 
doesn't need to be very big - you're only going to achieve a few percent 
compression and so it only needs to be a few percent bigger than the rest of 
the air path.  And it presents resistant to the vehicle's path through the air.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club