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

[Jeff Meager]

When you compare the period of time that a turbo is making better efficiency
vs screw-comp, it is for a very small time period.

Forget peak power, efficency etc.  They all mean nothing!!!!  What really
matters is what you can do with it. We have had both a 732 hp turbo engine,
and a 400hp whipple engined Nissan silvia (we had both engines in the same
car).  The senario that worked best everytime, in all events was the SC.  It
was on boost in no time, at full boost.  Yes the turbo engine had 350hp
more, but only when revved to hell, and in motorkana's etc, it just didn't
work well - not as well as the SC....

Each to their own.  I've got a turbo, I'm upgrading my turbo, but given the
dollars, I'd pay for the Whipple.  Driven it, want it.... no lag.....

LJ

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Greg Hermann
Sent: Monday, 15 October 2001 9:46 PM
To: diy_efi at diy-efi.org
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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