[Diy_efi] Advice needed! Motronic or mirocontroller?

[Alexei Pavlov]

Hi Marcus,

According to Steve the archives are available or will be available soon.
It would be a nice idea to look at them, your questions are very common.

At this site
http://www.netquest.net/~knighton/software.htm
you'll find a 'ditrial' software that will allow you to find maps
of the 1.3 and 3.1 Motronic ECUs.


mhaggers at yahoo.com wrote:
> 
> Hello,
> 
> I'm new to the world of efi and am currently thinking about turbocharging a BMW M70 engine that
> runs Motronic DME 1.2 or 1.7. I have two ideas to control the new fuel requirements. Both include
> larger injectors,increasing the fuel pressure and fitting a larger flow rate hot wire air flow
> meter. Then i need to modify the injector timing and have thought of two ways that this can be
> done.
> 
> Modify the fuel map on the eprom to get the required fueling. (plus i can also modify the ignition
> map) Does anyone have any knowledge or .bin files. How hard will this to a newcomer? I have an
> general engineering degree but have never used eproms before.
> 
> or
> 
> I can install a microcontroller along with an ADC and DAC, inbetween the new hot wire AFM and the
> ECU. This can then map the the new readings to corrispond with the old readings. For example: The
> new AFM will give a lower voltage reading compared to the old, but this may still be to high once
> the larger injectors and increased fuel pressure have been fitted. The microcontroller could then
> be used to reduce the AFM sensor output (as seen by the ECU) even lower to compensate.
> 
> Could i please get feedback on these ideas as to if they are workable, which idea seems better? I
> like the idea of modifying the eprom but i am put off by how hard this may be.
> 
> Cheers,
> 
> Marcus
> 
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