BOSCH stuff

[Michael McBroom]

Steve Meade wrote:
> 
>         I have a bit of Bosch FI confusion. Porsche refers to the engine
> management system in my 944 as being Digital Motor Electronics. I thought
> that this pretty much translated into Motronic for all practical purposes.
> Then, I bought a Haynes manual for my car which says I have an L-Jetronic
> fuel injection system controlled by Digital Engine Electronics. To confuse
> matters even more, a Porsche site (non factory)  proclaims me as having a
> JE-Jetronic system. This morning, I took apart part of the floor and got to
> the ECU to see exactly what it said. It is the familar "tab-cover" box with
> "Motronic" embossed in the case. I looked at the number on the box and it
> started with "261" the same as on my '87 BMW 325is with Motronic 1.1.

It appears that you have uncovered the truth.  According to Charles
Probst in his book _Bosch Fuel Injection & Engine Management (Robert
Bentley, 1991), all 944s have Bosch Motronic systems.  He makes no
mention of JE-Jetronic, although he mentions a few variants of
K-Jetronic, one of which is KE-Jetronic.  Citing from Probst again,
there are three basic Motronic systems (up to 1991, that is):  Motronic,
LH-Motronic, and KE-Motronic.  Yours should have the plain Motronic
system (and yes, Probst shows your 325 as using the same one), which is
characterized as having such basic features as an air-flow meter, pulsed
injection, idle stabilization, and ignition timing control.

Incidentally, I can recommend Probst's book.  I bought it to learn more
about Bosch efi systems in general and LH-Jet in particular, and it has
helped in that regard.  I wish he would have gone into considerably more
detail in several areas, but it has served as a very worthwhile
introduction.

-- 
Best,

Michael McBroom

'87 745T 123k w/APC                 Visit the Volvo Performance Site:
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California State University, Fullerton			
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