ignition advance curves

[Orin Eman]

> Unlike most other engine manufacturers, ECUs used on Toyota 16v motors keep
> timing very close to detonation. Ford just backs off 8 deg at the first hint
> of knock.

On my car, it backs off 2.7 deg at the first sign of knock, or more
correctly, when it thinks it has detected knock.  This applies
to all cylinders!  It advances 1.3 deg at a time after a few seconds.
The code is really buggy... I'm sure it's not doing what the designers
intended, but the errors cause it to retard more and/or longer than
it should.  A later version has fixed some of these errors.

Now this ECU also has 6 degrees of advance over what I would
expect at 5500 RPM.  Guess where max power is specified...

Orin.