Guy,

I've wondered something about those adjustable cam pulleys: If the car has the crank position pick-up on the flywheel, I can see where advancing the cam wouldn't screw up the ignition timing - it would always fire in relation to the crank position, regardless of cam position (to a point). But if the car has a hall effect sensor on the cam, the only knowledge the ignition has of the crank (or piston) position is what it gathers from the cam position, which is now false because we advanced the cam in relation to the crank.

Thoughts??