additional injector

[talltom]

>
>From: michael glidewell <glide at shore.net>
>Date: Thu, 09 May 1996 09:29:50 -0400
>Subject: Re: 8748 add'l injector controller design
>
>At 07:53 PM 5/6/96 -0700, you wrote:
>>
>>    I have completed the breadboard of my 8748 controller which drives 
>>two 60 lb/hr injectors (using MC3484 peak/hold drivers). It works great 
>>in my BMW 745i (factory intercooled turbo, 7-8 psi). I am now running 
>>16-17 psi boost with no detonation - in fact, I think my fuel map is a 
>>little too rich! (no oxygen sensor).
>>     I have laid out the artwork for a two-sided PC board using Eagle 
>>2.6, but have not had it fabricated yet (the first two boards are the 
>>expensive ones - about $250-300 ;) It's not a very flexible design (map 
>>is stored in EPROM), but it _is_ simple, with a low component count, 
>>and the software is only about 100 bytes long (plus the 256 byte map). 
>>The only expensive item (other than the PC board ;) is the 0-30 psig 
>>pressure sensor with 0.5-4.5 volt output - cost me $43 from OMEGA.
>>    Anyway, if anyone's interested I can post a ZIP file with the 
>>schematic and the artwork (printable on a HP laser printer). It's only 
>>about 60Kb compressed. Usual disclaimers about blowing up CPU's 
>>and engines at your own risk, etc.
>>    Next revision is to add a multiplexer to the A/D input (from the 
>>pressure sensor) so that an oxygen sensor may be used for closed-loop 
>>control.
>>-Charles

Well we happen to have a 81 M745 laying around here too, and it does have
a o2 sensor. Anyhow I'd be interested in seeing anything showing exactly
what you've 
done.