A paragraph from UpRev's tuning guide for Nissans:
Quote:
On the newer vehicles equipped with VVEL, the ignition advance algorithms rely heavily on knock sensor feedback. In
many cases it is not possible to make the ECU run more advance because as soon as you increase the values it hears
something on the knock sensor and adjusts accordingly. For VVEL vehicles you WILL still have to pull timing for forced
induction applications so that it won’t ping before it has a chance to do any learning. However for NA applications about
all you can do is pull back the high spots and smooth the table out. The ECU will do the rest on it’s own. In our testing
we found that pulling LARGE values from the main ignition table caused a LARGE power drop on the first run, but after a
few consecutive runs the ECU would advance the ignition right back to where it was before based on knock sensor
feedback.
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In some ways our cars are self-tuning within reasonable limits.