[Diy_efi] RE: BMW Motronic 1.3 table editing?

[Chris]

Jeff -
I was waiting for someone who knows better than me speak up, but I'll give
the fuzzy memory a poke here...
When I was at the dealership we had a guy in house that did that on the
older cars with the EPROMS (pull it out and flash it). I'm not sure now as
to exact model years, but I think the general rule is if you have the big
screw on diagnostic connector, it is EEPROM, and factory tuning updates are
flashed through the diagnostic connector. If you have the small push on
diagnostic connector, it is EPROM and factory updates are done via chip
replacement. I also remember there being exceptions to that rule. 
There used to be a very active USENET group specifically for BMW EFI modders
- it is worth a look. The guys on the USENET group were talking about
modifying a reset tool to use as a connector for flashing the EEPROM from a
laptop once upon a time, but it is probably better to just buy a cable, if
not the software.  
I seem to remember Dinan being the king of the hill in that department (ECM
tuning software, connectors, and such), I'm sure a quick Google search will
get you there. At least you should be able to quickly ID what options are
for your car based on what they offer. 
Last, but not least, the source for your camshaft may have a pre-calibrated
chip or a one-shot flasher for your setup. 

I know, not the answer you were looking for, but hopefully at least a little
help.   


-----Original Message-----

Date: Sun, 8 Oct 2006 09:51:46 -0700
From: "JS Nord" <jsnord at hotmail.com>
Subject: [Diy_efi] BMW Motronic 1.3 table editing?
To: <diy_efi at diy-efi.org>
Message-ID: <BAY108-DAV16445BE62F3B6A1EB9E133C1110 at phx.gbl>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=response

Hello,

New arriver to the list here.  Thanks for having me - great resource.

My interest is in being able to modify the fuel and timing maps for used in 
the BMW E34 535i, Bosch motronic version 1.3.  I'd like to be able to do to 
help tune out a modified engine that includes a displacement increase and 
cam shaft change (no forced induction)

I'm curious if anyone on the list has experiance in understanding the 
mapping structure associated with this version of Motronic.

I'm also curious if anyone has experiance in using this tool from Atlantis 
software that seems to have the ability to edit the motronic tables 
http://www.atlantisconsultingllc.com/atlantis.php?page=Motronic%20Editor 
Best case would be someone who's used this tool on the BMW 1.3 motronic and 
has the offsets for all the tables with some real world experiance on how 
well this tool works.

Anyone have any thoughts on past discussions or projects in this area that 
might help me get started?

Cheers!

Jeff
90 BMW 535i