engine/turbo theory question

[Rave Racer 2000]

----- Original Message -----
From: <JShadzi at aol.com>
To: <marcswanson at mediaone.net>; <caliban at sharon.net>; <quattro at audifans.com>
Sent: Thursday, October 12, 2000 12:39 AM
Subject: Re: engine/turbo theory question

>  >  is there any overall power loss that comes from the
>  >  pressure (backpressure?) required to turn the turbo?
>
>  Yup.  Essentially, if you were to remove the boost effect of the turbo
(say
>  by leaving the wastegate always open), the NA equivalent engine will
produce
>  more power than the non-functioning turbo engine.  This is one of the
topics
>  covered in Corky Bell's book:  Maximum Boost.
>   >>
>
>     Yes, but don't forget that it is the restriciton of the turbo that
builds
> pressure in the exh. manifold to spin the impeller of the turbo.  If the
> turbo did not cause any restriction, there would not be enough pressure in
> the exh. man. to spin the impeller.  All in all, it is not really an
issure,
> and is calculated into the efficiency of the system.  That energy that
would
> normally be wasted out the exhaust is used to pressurize the combustion
> chamber to make more power-a good thing overall  =)

        But what you're saying is if you could find another way to power the
pressurize side of the turbo, you would be able to get more power then by
using the exhaust pressure.  Is this right?  I think that Javad is basically
saying that the exhaust gas pressure is essentially the most efficient and
accurate way to power the turbo, and that the only other way to power an
intake pressurizer is a supercharger using belt drive also robbing the
engine of power.  An electrical compressor that would be driven by the
alternator or battery wouldn't have the power.
            So how do you turbo charge one of those newfangle electrical
cars?
                                            ... buy an amp  ; )

RR