Paul,

You wrote that the Innovate wide-band mixture monitor provided
misleading data during your dyno session. Do you think that you just got
a defective one or have you or Mazdatrix heard reports that their
product isn't generally reliable? It doesn't look like there are other
off-the-shelf low cost wide-band competitors on the market. Others cost
$1000 and up.

Barry Gardner
Wheaton, IL

Dave Lemon mentioned to me he has tried several different brands
and found them all unreliable. This one was about $400 as I recall.
That is hearsay of course but I have no direct experience. An interesting
thing about it was the built in system
voltage display. It was off by about a volt when compared to a VOM.
I suspected  that the separate voltage supplied to the injectors
using Tracy's wiring scheme was dropping and therefore reducing
the speed at which the injectors opened. What caused me to suspect
this was the system voltage display in the Innovate.

That is when we got the VOM and checked the system voltage. The way
Dave has the dyno wired is; he uses a three  12 volt battery bank wired
in parallel. The alternator on the test engine is not wired to this bank of
batteries.  I therefore suspected some strange effects from
this unregulated source of 12 volts. When we started monitoring
it with the VOM it was much more stable than indicated
by the Innovate voltage monitor. In fact very stable indeed.
Why Innovate monitors and displays the voltage I know not. Unless of course
they are NOT regulating the voltage in the unit they are using
to evaluate the mixture!

Well in any event we are going to hook my dual channel oscilloscope up to
the injectors today and monitor the pulse width to see what is going
on with the mixture suddenly going lean at high power. That and hooking a pulse
generator to the CAS input, and a hand vacuum pump (engine simulator)
will allow me to pre program Tracy's mixture settings. Pictures
and data at 11 :)

Paul Lamar

Paul-

Mark and I sent the EM2 on Saturday.  It is a by-10am delivery directly
to Mazdatrix - so you should have it in hand 1st thing.

We did not try to build a harness for it, since we didn't have any
insight into the lengths you would be needing.

Mark & Mark

Thanks guys.
Dave Lemon came up with a good plan. He is going to slap a 58
mm (2.28") down draft Weber on it and do some dyno pulls while
I build an engine simulator and program the map in your computer
for the 50 pound injectors. I need to leave this Friday
for a week so we want to get this thing tuned as soon as possible.

Dave said no problem letting it sit for a week in case
I can't get it programed to my satisfaction by Friday.
I have a few other pressing things to do also before I leave.

Paul Lamar