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Well, actually, the engines compression ratio does NOT change, just the density of the air going into the engine is less than at sea level...so the engine is compressing a less dense AF mixture to start with.
Supercharging (continuous engine driven) or turbocharging (variable exhaust driven) systems and turbocompound (both) technologies were developed initially for aircraft, but have been also encorporated into automotive vehicles, most notably: (a) diesel engines (turbos) and (b) drag racing engines (superchargers).
You didn't mention (in this posting) which model/engine your car is. Is it fuel injected? Can it run on ethanol-laced gasoline, E15-E85, etc.?
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