8748 add'l injector controller design

[Charles]

You wrote: 
>
>>    I have completed the breadboard of my 8748 controller which 
drives two 60 lb/hr injectors (using MC3484 peak/hold drivers).

>Sounds very lilke a very ambitous  project! Is the 745i an L-jetronic 
or Motronic? What did you actually replace on the stock unit?  Ihave a 
528i L-jet which I would  like to improve.
>----------------------------------------------
>Michael Glidewell       Boston, Massachusetts	glide at shore.net

    This was designed as a _supplementary injector_ controller only - 
the stock setup is still all there and unaltered. It's an L-Jetronic. 
(Actually, since I increased the engine size from 3.2 to 3.5 liters, I 
raised the fuel pressure from 2.5 to 3.0 bar and tightened the airflow 
meter spring about five notches. The meter can "read" the bigger engine 
without raising the fuel pressure, but it will run out of range sooner 
if the spring is not tightened).
    A more ambitious project would be to replace the stock ECU with my 
own design... but I'm not feeling up to it! The original design works 
well enough that I don't want to re-invent the wheel...
What don't you like about your 528i system? Feel free to e-mail off the 
list (or on).
-Charles