Suzuki CDI information

[lance]

This is consistent with the motorcycle ignition boxes I have worked on.
Some of the earlier ones have a diode on the base of the output transistor
that will induce rpm limiting when a ground is applied to the other end of
the diode, I have seen this on some Yamahas and eliminated rev limits by
removing the diode.  It isn't necessarily a good thing to do.  You might
want to calculate your mean piston speed before removing the rev limiter.
Most bike engines are pretty high strung from the factory and unless you are
also modifying the oiling system, hand fitting the rod bearings, and using
stronger that stock pistons, you may find that removing the rev limit only
shortens service life.  I know this from experience, not from the texts.

Lance Wolrab

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Eric Bryant
Sent: Wednesday, August 29, 2001 05:02
To: 'diy_efi at diy-efi.org'
Subject: RE: Suzuki CDI information


> From: Bert Bakker [mailto:bert.bakker at bakker-it.nl]
> Subject: RE: Suzuki CDI information
>
> Ok, I understand I have to put the unit for a day in the
> freezer. Do I get
> it right than that the unit is not completely filled up with this
> filling-stuff? They made only a lid? Does it make sense to drill holes
> around the "lid's" edge?
>

I took apart my Suzuki TL1000R ECU by cutting apart the casing to expose the
potted board, and then soaked it in naptha for about a week to loosen up the
potting material.  Since the case was filled with the potting material, it
would have been nearly impossible to extract it by any other method.  It was
a terrible pain in the butt.

> Can you tell me a little bit more over what I will find
> inside? Is there a
> microprocessor? Editable code? Or only standard electronics?

My ECU has some unidentifed micro, and the manufacturer placed epoxy around
the perimeter to avoid any sort of tracing of the pin-out.  There doesn't
appear to be any external EPROM, and it seems as if there's only a few bytes
of EEPROM that are actually accessable by factory equipment.  I'm almost
thinking that the micro's program and calibration parameters are contained
in masked ROM, with a bit of EEPROM for idle tuning and gross mixture
changes.

I haven't gotten anywhere further with this part.

Eric Bryant
mailto:bryante at ghsp.com
http://www.bryantperformance.com
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