Aerochargers are better than a twin screw!! hahaha ;-) change to: Back pressure

[Mark S. Riley]

Really need to put a pressure guage in the exhaust before the turbo and see
exactly what pressure it's going too. Believe me, 21psi intake manifold
pressure and 19 psi exhaust pressure is attainable in a daily driver Buick
on 93 octane pump gas. Got to put slicks on it to hope to hook it up under
55 mph. Corky's book is real generic kinda like MacInnes book was. When you
talk about turbo's, it will be generic until you nail down the
specifications. And then you can measure what happens but still not
neccessarily predict with a tremendous degree of accuracy what will happen.
Cause amazingly simple things can have big effects in a turbo system and not
have the same effect in a blower or normally aspriated system. Corky didn't
tell all in the first book, so he would be able to do a sequel which is due
out shortly :-)       Mark
----- Original Message -----
From: "Stephen Webb" <swebb at netlab.uky.edu>
To: <diy_efi at diy-efi.org>
Sent: Monday, October 15, 2001 11:27 AM
Subject: Re: Aerochargers are better than a twin screw!! hahaha ;-)


> > Twice the exhaust BP than boost pressure ? So you're saying your exhaust
has
> > 30 PSI backpressure ?
>
> From reading "Maximum Boost" by Corky Bell, this sounds plausible.  I
> believe at one point he says that "after the crossover point, when boost
> pressure surpasses exhaust backpressure, you can start to make serious
> power."  This is just a paraphrase, and if I understood it correctly it
> was referring to competition engines, and not your daily driver.  Still,
> though, he talks about exhaust backpressure commonly being higher than
> manifold pressure, and how it's a consideration when choosing a cam (ie
> stay away from overlap, etc)
>
>
> $0.02
>
> -Steve
>
>
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