Originally Posted by Billabong
SC's work best at lower rev's (where a turbo wouldn't be spooling up yet) so makes more sence to 'drive' the turbo from the SC, not the other way around.
Err, not really
Think about it bill, turbos are driven by exhaust gas, the supercharger boosting gives the engine much more exhaust gas, which drives the turbo
Also im 99% sure it sucks its air from the turbo inlet rather than a seperate inlet (as a seperat inlet would require more fancy pipework shenanigans to stop the turbo boost blowing out the s/c inlet once it running higher boost than the s/c, and the other way round when the s/c is the one running higher boost), so still driving it the say you mentioned
And now im 99% sure the s/c worked on the S4 like the Powerengineering fiesta- Ie roots style charger inline, after the turbo, no fancy electromagnetic clutches and all that complicated bollocks like a lot of people have done since, it was done the easist way, and worked just fine.
I still dont know why they made an "exhaust" from the dumpvalve tho, thats a bit odd...