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re: Re: User-programmable engine computers
> Has anyone tried to use the Haltech, Electromotive Tech II, or similar
> EFI systems on a streetable Audi?
How would you integrate it with K-Jetronic/Motronic? Haltech's designed to
read sensors and drive pulse-type injectors. It's oriented toward a
speed-density approach: looking up a base pulse width based on rpm and
manifold pressure and modifying the pulse width to adjust for other
sensors (eng temp, air temp, etc). K-jet systems are "mostly" metered by
the air mass sensor in the fuel distributor, and fine-tuned by "diddling"
(somebody else used that word, I like it) with the fuel pressures. If there
are ROM lookup tables in an Audi computer, I don't know what they'd be used
for, except for the aforementioned diddling and ignition timing.
You'd have to replace the whole $y$tem to use this, I think. Maybe you could
set up the Haltech to diddle the differential pressure regulator, or frequency
valve, or whatever the equivalent on the K-motronic cars, but it's a lot of
computer horsepower for that task.
Do any Audis use a pulsed injection system? The Haltech would work alright
for that. I don't have any specs on the Electromotive Tech II.
By the way, last time I checked, a Haltech was either $800 or $1100, depending
on which one you bought. The was about a year ago. I was planning on building
a new motor for my 260-Z, and I thought about replacing the carbs with EFI. But
between the computer, manifolds, throttle bodies, injectors, wiring... it looked
like $2k for the EFI alone. I bought a junk Z for $250, with the L-jetronic
EFI already on it. Now using that as a base, plus something like a Haltech, might
be a little more acceptable, price-wise. But since I already spent $$$$ replacing
seats, carpets, doing minor engine work, stripping and repainting the car (ever
priced car paint? ouch!), replacing rubber seals ($130 for each door seal!), not
to mention tools, I think the engine rebuild will have to wait a while...
Sorry about the off-charter Z stuff, just wanted to place the Haltech info in
Walter Meares Intermetrics, Inc. firstname.lastname@example.org
Information Systems 733 Concord Ave Cambridge MA 02138