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Variable displacement schemes are often talked about on EcoModder, but I don't think we've seen a DIY success yet. Probably because of the enormous engineering effort required to extract fairly small gains.
Using intake parts from an engine that leaves the factory with variable displacement is a great idea. A better one, that involves less fabrication and doesn't require a custom controller, is to transplant a variable displacement engine + ECU into your target chassis.
The biggest problem with MegaSquirt is it's not OBD-II compliant. In my state, I would be unable to install it in a road-going vehicle '96 or newer.
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