Re: twin turbos?

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Wed, 5 Jun 1996 ptimmerm@mashtun.JPL.NASA.GOV wrote:

> Turbo Scott said wrt twn turbos....
> 
> ...  Might want to look at the Lancia Rally car concept, it has 
> more validity to the audi than a twin turbo would.....
> 
> If I read him right, he is implying that the addition of a
> supercharger to the existing turbo system would be a better
> idea.  With other massive turbo apps like tractor pull rigs
> or hydroplanes, they run sequential with cooling at each
> stage.  So you compress, cool, compress again, cool again,
> then run it into the motor.  How about a g60 front ending
> a k26 derivative with stock intercooler plus another small
> one after the g60?  As scott is fond of saying its FLOW no
> pressure you want.  Who will be the first?

The trouble with a sequential setup like that is that you will always be 
limited to the maximum flow capacity of the smallest Xcharger.  What we 
want is a parallel system, in which the ECU can choose between a 
supercharger (fro low RPM throttle response) OR a turbo charger (for high 
rpm power)  The trick is being able to transition between the two systems 
smoothly.  Not rocket science, but difficult nonetheless.

Later,								
Graydon D. Stuckey								
graydon@apollo.gmi.edu								
Flint, Michigan   USA
'86 Audi 5000 CS Turbo Quattro, GDS Racing Stage II