Over the past 16 years we must have spent thousands of hours trying
to trouble shoot Tracy's EFI system with out adequate information.

On production cars this problem is solved with OBD II. OBD stands for
on board diagnostics and was mandated by the gov. OBD II sends error
codes to a connector under the dash board. This can be connected to a
PC with the proper cable. This is a very effective system and can be
diagnosed in seconds.

A maximite could do the same thing by displaying  data from the
sensors and the pulse width of the injectors on a small VGA while it
was running the EFI.

My plate is full with the newsletter, my new ignition system, the TTC
project and up grading my NC mill. I have a small amount of time to
help if somebody would be kind enough take over this project. You
would be gaining a very valuable skill.

Paul Lamar


This sounds like a fascinating project.  I've been looking for local
folks with racing/EFI/computer experience who might be willing to
assist.  No luck so far, but I will keep looking.  Might have another
good contact this weekend.   It is clearly out of the scope of my
individual talents!

Scott Gettings



You under estimate your self Scott. I know you better than that.
It should not take long.

Paul Lamar

Here is another point. The Maximite and DOS/QB hardware control development
systems are the only hardware control development systems where you do not have
to build the actually target  hardware to test them.

All output and control  data, normally going to control  hardware, is merely
printed on the screen or saved in a text file along with the sensor
date that caused them to happen.

For an EFI system you can simulate the manifold pressure sensor with a potentiometer.
The top of the pot is connected to 5 volts and the bottom is grounded.
The wiper is connected to an Analog to Digital pin on the Maximite.
You are now ready to start programming.

You can add a RPM input with a variable oscillator.
Or a variable speed drill motor revolving a short piece of steel and a stock
crank angle sensor.

Here are some pictures.

Paul Lamar


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