- VVT_extremedifference_scattergraph.png (88 KiB) Viewed 1316 times
OK so Here is the exact same scatter graph, but with the negative 7 to plus 7 VVT angle difference filtered out.
Doing that really opens out the data in the Time v RPM v VVT difference graph.
The two lower graphs show the same data but with the one on the left favouring positive VVT difference values and the other negative VVT difference values.
Also: the VVT difference formula is simply [VVT int L] - [VVT int R] in the app.
The filter I applied is this:
[Field.VVT difference] > -7 && [Field.VVT difference] < 7
I think this is a correct explanation also:
negative vvt difference = left side lagging
positive vvt difference = right side lagging
Whats my takeaway?
Well, I consider swapping AVCS solenoids from side to side to be a good practice.
For example, annually or every 50K klm, or whenever significant lag appears in my logs:
Doing so generally fixes lag and the system stays in harmony, rather than getting more and more overcooked as it struggles to self-calibrate.
So that's where I'd begin. Remove, soak, clean reinstall on the opposite side.
And smash out that log with more data, holding the rev points I mentioned as well.