[Diy_efi] And for the bottom end of the market....

[efi student]

If you are trying this with a  4A-GZE, you have a lot more to consider =
than
simple EFI.  The engine has a clutch controlled supercharger and is =
capable
of running vacuum and boost (the amount of boost is dependent on the
pulleys, but that's another issue).  Your motorcycle EFI is unlikely to =
even
want to consider running under boost.  Ignoring the knock sensors could
prove very fatal since a single tank of bad fuel could knock =
horrifically
under boost.

There are MANY other solutions, including finding out what is really =
wrong
with the OEM unit especially if this setup is stock.  Toyota ECMs are
difficult to hack but not to repair, I would chase that down first =
before
attempting to graft a single cylinder solution to each of the 4 on the =
4AG.

Lance

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] =
On
Behalf Of peterw
Sent: Saturday, June 14, 2003 3:03 AM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] And for the bottom end of the market....


> For a single-cylinder, manifold pressure won't even necessarily be=20
> useful for controlling the fuel pressure regulator.

Bearing in mind that I am new at this EFI game:-

Why would this be so ? For a small single cylinder engine couldn't you =
just
have a constant fuel pressure ?

For a CV carb isn't the amount of fuel delivered proportional to the =
venturi
pressure(ignore idle circuit ). i.e as throttle butterfly opens air =
velocity
through venturi increases, pressure on top of CV piston drops, CV piston
rises.

So, couldn't you just monitor venturi pressure and inject fuel
accordingly(lookup table). I realise that air density, amongst other =
things
has, an effect but if you wanted a simple "electronic carburator" why =
would
this not work ?

My experience(i.e riding 'em) with EFI bikes is that most of 'em don't =
do
EFI very well hence the plethora of aftermarket ECU's to allow =
remapping. I
think this is so 'cause bikes don't seem to use the number of sensors =
that
cars do and are therefore not very adaptive.

Peter


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