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Originally Posted by ekam
I think you mean the opposite. Higher elevation = thinner air = less efficient turbo.
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Nope,
turbo actually works better than NA in high altitude:
A turbocharger also helps at high altitudes, where the air is less dense. Normal engines will experience reduced power at high altitudes because for each stroke of the piston, the engine will get a smaller mass of air. A turbocharged engine may also have reduced power, but the reduction will be less dramatic because the thinner air is easier for the turbocharger to pump.
http://auto.howstuffworks.com/turbo.htm/printable