[Diy_efi] LPG injection

[Grant Beaty]

The large front-mount intercoolers that me and Derek have on our cars come
very close to bringing the charge air temps down to 5-20 degrees of ambient,
even running 30 psi of boost. Don't forget that propane requires more O2 and
therefor for boost to make the same power as methanol.

But lets be realistic for a second. We are talking about suplimental
injection systems for gasoline-powered turbo cars correct? At least I am :)
Which fuel could you run the most boost (ie make the most power on gasoline)
with? Obviously one can always spray more and turn up the boost, but the
main reason to do this is convienence right? Which fuel can be used with the
most (gas volume) / (other volume) ratio?

Grant

----- Original Message -----
From: "Dave Dahlgren" <ddahlgren at snet.net>
To: <diy_efi at diy-efi.org>
Sent: Saturday, November 23, 2002 10:48 AM
Subject: Re: [Diy_efi] LPG injection


> You are burning pounds of air not CFM. Air density through charge cooling
> increases density and lowers the charge air temp. Adding pounds of air
through
> more boost comes with the burden of compressor efficiency and the related
heat
> that lowers air density. So the real goal is to get as many pounds of air
in
> while still having the coolest charge air temp as possible. That is why an
> engine with small ports and a lot of boost seldom even comes close to the
power
> output of an engine with properly sized ports and way less boost..
> It is always about density..
> Dave Dahlgren
>
> Grant Beaty wrote:
> >
> >
> > The end goal here is (of course) the most amount of power. If you must
turn
> > up the boost to achieve more airflow, I don't see how thats any better
or
> > worse than increasing air density.
> >
> > Grant
>
>
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