If you want some let me know.

  I moved the op amp circuit and the flow meter circuit
  to the main mother board. I also added an on board 5 volt
 regulator
  and some CAS trigger conditioning circuit.

  For more info on this project read.
  http://www.rotaryeng.net/simple-cheap-555.html

  Paul Lamar

  I want some.

  Wade Bush

  I'll probably get some pricing tomorrow. I will sleep on
 the design
  and check it again before I send it out.


 ------------------------------------------------------------

  Good thing I checked it. Found one mistake.

  Here is a lot of stuff. Feel free to ask questions.
  Next step is the mother board and a bit of work on the op
 amp.

  Is any body interested in a low cost kit of parts? No
 credit cards and
  no checks. Just green cash :)

  You will become part of the 555 EFI R&D community so
 there are no guarantees of any
  kind :) This system as not run on an engine yet.

  Paul Lamar

 Absolutely I would be interested in the parts kit as well.

 Wade Bush


      Paul,
The Freescale MPC555 was a massive engine controller IC.  While
state of the art at the time was 68332 based, The MPC555 w/
PowerPC and Floating point was the next leap forward. Designed
on the outset as engine/transmission controller it was the
follow up to our earlier MPC509.  So Dick Spilo, our Marketing
Manager, called it the MPC555 --- 555 in honor the timing chip!

For those building their own engine controllers. One thing to
look at it the mechanical function.  Generally it was simple
mechanical failures that lead to IC/PCB failures.  Thankfully
things have improved over the years, but I still remember
'reverse engineering a few failures' only to discover the
mechanical issue behind the electrical failure.

A tail of the idle speed controller in my neighbors BMW still lives on:
http://www.unofficialbmw.com/repair_faqs/idle.html
(circa 1993 -- before I moved to Texas).

Tom Walter


Apple and oranges. Our TI TLC555 chip is strictly analog. No software.
Cost less than a buck.

You put in the signal from a mass air flow sensor and out comes a
injector pulse width directly proportional to the amount of air
flowing into the engine.

Paul Lamar