Bimmers and motronic

[eric schumacher]

Hi Tamas
I recently went thru some of the same stuff you are going thru except with
the ECU from a Jetta GLX that I damaged in the process of putting a VW VR6
in my 85 GTI.  My goal was to repair the box.  By the way I am also a
hardware type EE. I got as far as finding alternate sources for some of the
chips.  I believe th processor is a 80c188 variat.  Most of the people out
there just alter a few things in the EPROM to change things like the rpm
limit and boost limit.  One way I have seen this done is to hook the whole
system up with an a flash d to a on the address buss and a second d to a on
the data buss  The two outputs are hooked to the V and H inputs on a scope.
Then as each of the sensors are tweaked you can eaisly see what areas of the
code are changing.  Then go in with an ICE and do detail analysis of the code.




At 04:28 PM 3/22/97 +0000, you wrote:
>Hi guys...
>
>I'm new here so I think I'll introduce myself a bit first.
>I'm Tamas from Hungary and I'm an electronic engineer and I'm involved
>in telecommunication and Computer technology. (LANs, Wide Area Networks,
>e-mail systems, ISDN etc.)
>Oh yes. My hobby is automotive technology.
>
>The fact is one of my friends is have a BMW 316is (I'm into Italian cars
>more than this kinda german ones) what he is want to put on the track.
>We are not talking about a street racer here but a serious race car. We
>made all the necessary modification on the engine, cams, heads,
>intercoolers everything but withour the electronics it's not finished.
>We asked a guy who made us a modified eprom but it came clear as he
>hardly doesn't know anything about engines, less about cars and maybe
>even less about electronics. Weird eh? It came clear also as he got some
>maps from somwhere and started to mess up with 'em. We payed him big
>bucks of money and got almost nothing.
>
>So I decided to learn a lot and finish the job.
>What I'd like to ask you to help me to start with and we'll se what will
>happen.
>I have now. Two complete ECU. One is in the car and one is in my hands.
>A factory and a tampered EPROM, some knowledge on engines, ASM and C
>programming, lotsa knowledge on computers. a computer and a stong
>decision as I'll find out the thruth about this thing.
>Oh yes and I'm going to build an Eprom burner soon...
>Could you help me?
>
>There are two beasts on the ECU panel which are looks as a processor
>(sorry
>I'm a guy who growth up on Intels so what I only can do now is to
>distinguish a pentium from a 286 :-)
>One is a 64 pin Siemens made SMD with
>BD 267648
>B 58024
>A404V13H   on it.
>
>The other one has Harris
>TA 13255A
>100163
>N9352
>B57725  printed on it.
>
>Would you please tell me what books I have to buy, what to look for
>etc...
>Many thanks in advance:
>Tamas (Tom) Boday
>http://www.geocities.com/motorcity/1450
>
Lotsa Luck Eric
85 GTI with VR6 power