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[Orin Eman]

From: "Gary Derian" <gderian at oh.verio.com>
To: <diy_efi at efi332.eng.ohio-state.edu>
References: <199907281900.PAA31616 at esl.eng.ohio-state.edu>
Subject: Re: DIY_EFI Digest V4 #437
Date: Wed, 28 Jul 1999 17:05:34 -0400
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The biggest problem with pressurizing a carb is the carb cannot compensate
for increased air density and will go way lean as boost goes up.  You can
fool it by closing way down on the air correction jets so the carb goes way
rich at high air flow but than you have two wrong things trying to cancel
each other out.  It usually doesn't work well, but it can work.  It goes
without saying that everything in the carb has to reference boost, fuel
pressure, float bowl, air jets and including the throttle shafts.  You must
seal or pressurize the throttle shafts otherwise fuel will leak out under
boost.

Carbs behave better when used as draw through but that introduces a
different set of problems.

Gary Derian <gderian at oh.verio.com>

>
> Hi all,
>
> With the list in digest mode it seems the mail has really slowed down.
Anyway,
> I'd appreciate if someone has a solution for this minor inconvenience.  I
have
> finally managed to get my Fiat 850, with the MR2 supercharger on it,
running.
> Currently its using the original carby in a blow through configuration
(the
> setup is crap, but will have to do for the time being).  With the whole
carby
> being pressurised there is enough fuel pressure in the electric pump to
make the
> car idle, however I'm sure as the pressure builds up the fuel pump runs
out of
> steam.  What is the solution?
>