BruceWarne

Hi
What does the DD field Knock Correction mean/imply?
What are safe values for it (mine seems to be either 0, or positive...).

mutant_matt

Zero knock correction means there is no Timing alteration due to Knock. This means that the ECU thinks there is no Det (which is a good thing ). Positive Knock correction is ignition advance, I believe.

Matt

BruceWarne

One of the two, positive, or negative, must be bad...?
I assume negative is bad, and positive good...?

mutant_matt

Correct (as I understand it anyway)

BruceWarne

Cool

mega_stream

How much +ve knock are you getting?

AFAIK small amounts are ok, .5 and 1% type readings.

BruceWarne

-0.5 =< myCorrection <= 7

mutant_matt

Bruce,

Knock correction on a standard, healthy MY00 UK car:



And the same on a standard healthy MY02 STi Type UK:



Hopet this helps,

Matt

BruceWarne

Thanks Matt!
I've got an STi7, and the behaviour looks about the same, except that knock correction rarely if ever goes below 0...

Why is the MY00 graph so much different, does knock correction mean something else there...?

[Edited by BruceWarne - 9/26/2002 10:37:48 AM]