Jeff wrote.
> BRITISH CAR magazine had a 'How-To' article on adding fuel
injection
> to a MGB about two years ago. All the parts were scavenged from a
> junk yard. If I remember right, the fuel injection unit was a
Bosch
> from a 4cyl Fuego and no software coding was needed. This article
> might apply to Alpines. It was in the June and August 1995 issues
> which are still available.
>
> Jeff
This writeup is not for the purist here, but if anyone out there is
interested
in enhancing the driveability of an alpine without putting in another
engine,
read on.
There is a lot to be said for fuel injection on an alpine, in terms of
smoothness, tunability and reliabilty.
Recently I removed the EFI system from my car to install dual side
draught webers, and the motor runs soooo much rougher with the
webers than it did with EFI.
Also the Webers suffer from poor fuel control off idle, where the EFI
system worked far better.
There are a lot of potential systems that can be grafted to an alpine
for
alternate fuel control. The easiest to use is the TBI system, but the
TBI
systems have problems with fuel fallout, and puddeling in the inlet
when the engine is cold.
The Fuego used a TBI unit, that works well in many applications.
The Jetronic control system that controlled the affair, was reliable,
but not
too forgiving of engine modifications. Off the shelf engine controllers
dont work too well outside thier application as the fuel control
parameters,
much like carburettor jetting is dependant on the dynamics of the engine
that is is specifically designed for.
There are several companies that sell 1bbl Fiero EFI kits, that use the
GM
computer. Once again these controllers work well for 2.2 to 2.6 liter
4 bangers of very mild tune. Put them on just about anyting else,
and some form of the perfomance will suffer.
If anyone out there is considering installing injection on an alpine
keep in mind that these lower cost kits offer no provision for
calibrating
the fuel parameters. These parameters are built into the controller.
These kits generally come with an adjustable fuel pressure regulator,
which serves as a crude fuel control..
Bosch made some TBI units that were intended to be a bolt on for many
applications that used the ever so common progressive weber.
These units were available on early Renualt Alliance fuel injected cars,
and will mount atop a SIII-SIV solex manifold. These TBI units even say
Weber on them.
Also the Chrysler K cars that used 2.2 and 2.5 liter transverse 4
engines
used a Bosch 1bbl TBI that is easily adapted to any 4 banger.
Jarrid Gross
______________________________ Reply Separator
_________________________________
Subject: RE: EFI in Alpine (was RE: fires in the car)
Author: "G. Wilson" <gawilson(at)VNET.IBM.COM> at INTERNET
Date: 4/28/97 1:22 PM
I received this very interesting note from Jarrid about his EFI Alpine
and he gave me permission to share it.
--gale
------------------------------
>Jarrid,
>If you don't mind belated question, how'd you do EFI in the Alpine?
>
>Thanks,
>gale
I built a manifold from a series II piece. Mods included welding some
bosses for the injectors to point toward the intake valves.
The system used 4 injectors, and was phase sequential (1and4)
injectors fire simultaneously, followed by (2and3).
The control was done using some custom circuitry along with an
off the shelf embedded computer, with my own software written in
assembly
language.
My system used an O2 sensor for monitoring the air fuel ratio, and
used this signal for feedback, which after several seconds of running
poorly, will allow the engine to receive the correct mixture again.
This feature helped when I drove the car at high
altitude.
The package I designed included a graphical engine monitor
that runs on a laptop, and allows me to tune the engine without
even popping the
hood.
I used off the shelf fuel injectors and GM
sensors.
I got the fuel pump and air door at a local bone
yard.
Along with a pretty stout camshaft, the motor produces about
120BHP.
I now have reverted to carbs "dual twin choke webers", but I will be
modifying this new manifold for injector bosses that will allow me
to run carbs or EFI.
It is possible to buy off the shelf computers, EFI webers ECT to do
effectively what I have done, but his would cost in excess of $2000,
and I really only have about $100 invested in my system if you
ignore design and software time.
Cheers,
Jarrid
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