Aerochargers are better than a twin screw!! hahaha ;-)

[Bruce]

OK, so we have some additional Backpressure.
Just adds a little more EGR, using a cam with less overlap then a N/A, and
that negates the BP, drawback, to a large degree.

The 2x backpressure number is also, for rather mild applications, where
things are set for an absolute min of *lag*.

Toss in an automatic tranny into the mix, and the *lag* is an asset.   Also,
engine displacement.   Also, in some applications your tire limited, so
having instant boost is just a waste of HP, since you may not be able to
hook up the tires anyway with instant HP.
Bruce




From: "Greg Hermann" <bearbvd at mindspring.com>
Subject: RE: Aerochargers are better than a twin screw!! hahaha ;-)


> At 5:37 PM 10/15/01, Jeff Meager wrote:
> >And what about the losses that a turbo causes due to the horendous
> >backpressures.....  you're not going to tell me turbo's are free
horsepower
> >are you???  The T88 on the 2.2L nissan engine I worked on that's putting
out
> >732hp at the wheels doesn't suffer the backpressure fate, but it also is
not
> >making any real boost until 5500rpm.....
> >But a turbo that is on boost at 15psi, has on average, twice the exhaust
> >backpressure, than boost pressure....
> >LJ
> Yes, a turbo makes more backpressure--but it DOES let the overall package
> operate at a higher expansion ratio. A mechanically driven supercharger
> does nothing for the engine's overall expansion ratio. Expansion ratio is
> what makes HP.
> Greg

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