I believe Tracy uses the following dwell settings: RX8COIL 2.6MS
RX7COIL 3.5MS LS1COIL        4.3 MS LS2COIL        4.0 MS

Mine is currently programmed for Renesis coils and  reads about 2.4MS
on my scope when running at ~1500RPM. I have D585 coils so I need to
change the programming to 4.0MS, the spark may be a bit anaemic at
2.4MS but it runs.

Cheers

Steve Izett


Good info Steve. Does it stay the same as the RPM changes?

How do you change the program?

Thanks.

Paul Lamar

Paul

Not sure if the dwell changes with rpm/load/? It is hard coded in
the source so needs to be assembled.

Steve

The only way I know how  to get the source, assuming Tracy did not
burn the security fuse, Is dump the binary and disassemble it. Have
you done that? One can then burn a new chip assuming you can decipher
the code :) Probably easier to program from scratch.

IMHO you are better off with the RX8 coils as the GM coil are
designed for half the spark rate. Typical of 2 cycle engines compared
to 4 cycle engines. One reason 2 cycle engines  use CD ignitions.

Tracy had to use draconian cooling methods to keep the GM coils
alive.

Paul Lamar

Just got Tracy's EFI system working on the bench.  Your right. About
5 ms for the GM coils. It is fixed with varying RPM. Tracy did a good
job handling smart coils with the software. Not an easy thing to do.

Now we need to check the MicroTech :)

BTW Tracy's system is for sale. I switched the RV4 to a carb.
Including a set of GM coils. It has a home made PCM.

Paul Lamar


Paul, I am  very interested in buying  Tracy Crook,s  EC2 you are
offering to sell.  I'm not crazy about sending cash in the mail,
but I'll do whatever you recommend no questions asked. Tell me how
much and how to.

Thank you,

Well you can send it registered or certified. I am not sure what the
differences is.

I might as well throw in the manifold, injectors and the coils. The
whole kit and caboodle. It's got 30 hours on it. You will have to
rewire it. I suggest buying a bunch of 22 gage stranded wire in as
many colors as digi Key has. It will pay off in the long run. I have
tons of docs on this sort of thing.

I would group the wiring  into harnesses one for the injectors, one
of the coils, and one for the sensors.

$500 takes it all.

This is more or less what it looks like. There may have been minor
changes here and there.


Send the money to:

Paul Lamar 830 east Santa Maria St Suite 303 Santa Paula CA 93060

Paul Lamar

Paul ,
 The check's in the mail. Thank you.
Tom Birch

No manifold so You will get a $100 refund. I forgot I sold it some time
OK.

Paul Lamar

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