Re: It's a Gas

[Tom Jennings <tomj@xxxxxxx>]

On Mon, 19 Sep 2005, Ken Ames wrote:

> Isn't this kinda the opposite of what you might want? Lots of boost at low speed
> will _really_ stress an engine, you want more boost at higher rpm where the
> engines volumetric efficiency drops off.

I dunno, people stress engines all the time, it's called
hot-rodding (or other things when it doesn't work out).

An engine that's slightly undersized -- say a 2.5L in a 3000 lb
car -- with 4 - 8 psi boost at low speeds would not be hard to
make reliable, and provide all the torque precisely when you need
it.






> Ken Ames
>
> Quoting Tom Jennings <tomj@xxxxxxx>:
>
> > On Mon, 19 Sep 2005 farna@xxxxxxx wrote:
> >
> > > The electric turbo looks neat, but boost goes DOWN with speed.
> > > Starts at 5-6 psi, goes down to 3 psi at higher speeds. Takes to
> > > much juice to spin it up at high speeds. I think I'll stick to the
> > > remote setup -- can do that with mostly salvaged parts too.
> >
> > Why is this a problem? Except for race conditions, boost at low
> > speeds, and less so at cruise, would seem perfect. A small
> > displacement engine is fine flat-and-level, but lacks torque for
> > accelleration.
> >
> > The real advantage to the electric supercharger would be software
> > control -- essentially the times when you'd be lugging it, you
> > boost the hell out of it, and back off at highway cruise.

>