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Re: S4 20v vs S2 10v

Scott writes:

>The S4 uses (dave L?) a bleed at the compressor that maintains the boost
>pressure between shifts, vs the RS2/stock turbos do not have this feature.

I looked through some documentation and the 1991 20V turbo has the turbo 
boost bypass valve which, when the throttle is suddenly closed, recirculates 
the boosted air to the inlet of the turbo compressor to keep the air moving 
and the turbo spinning. This setup helps eliminate some turbo lag. I would 
think the S4 also has this plumbing installed, but am not certain.

Dave Lawson  dlawson@ball.com