Paul,

We ran the "bench test" on the EC-2 today, turning the CAS trigger wheel
with a variable speed Shop Smith wood lathe.  This allowed rpm adjustment
from approx 1900 rpm to over 6500 rpm.  I've enclosed some pics of the
setup (IMG_0358.jpg) and the related scope traces (IMG_0365.jpg).  Voltage
measurements at the sensor pins (before resistor) were as high as 41v, but
were a max of 8.25 at the zener diode/22k resistor.  The majority of the
tests were with the CAS sensor gap set to .040 as this is what Bobby Hughes
measured the gap at on his Renesis.

The really strange thing, which I need Tracy's opinion on, is that the EM-2
would only read correct RPM up to about 5800 - 6000 rpm.  This is about the
same place where the engine starts cutting out.  At that point the readout
went crazy and would indicate anywhere from 0 to 6300, and anything in
between, and constantly changing.

We put the scope on the injectors and have included those traces too
(IGM_0363.jpg).  From what we could tell, the signals looked good up to 7500
rpm.

We also tested that the coils/plugs were firing up to about 8500 rpm with no
obvious problems.  Of course, this could change when under compression.

Another thing that we discovered is that RPM's on the EM-2 would not
indicate correctly unless we powered the injectors during the test.  RPM's
were verified with a handheld laser tach.

Since all of this began after converting my EC-2 to Renesis style CAS, I
think my next step is to borrow Bob Darrah's EC-2 and try it on my engine,
using the second gen CAS.
Mark

Nice Scope.
http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&cs=psu&ci=14408&lc=EN

Something is going on in the software. I suspect it is a time
related interrupt problem. Tracy may be using the software
to decode the RX8 wheel and the processor is just not
fast enough.

Good work guys. Way to go. Now we are getting some where.

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

If that was 10 ms per horizontal division on the scope
the injector period rate is 30 ms.  Or 33 pps.
The engine is turning over at 100 pps at 6000 RPM.
So it appears it is not timed injection.
Perhaps you took this data at 2000 RPM?

That was WOT as far as the MAF was concerned so the
injector pulse width is not near wide enough
for any RPM as far as I can tell. Unless of course you
have monster injectors in there and real high fuel pressure.

Injectors go on duty cycle. That looks about like only
10%.



BTW The beauty of using the Hytek is you can record up
to about 30 channels simultaneously.

All six injector widths and timing, three manifold pressures
and six ignition timing events. With the engine running you
could get three EGT's as well.  RPM is automatic knowing
the sample rate just like the scope.

You get the big picture all in one big spread sheet.

a scope.