On Sun, 8 Jun 2003, David Marshall wrote:

> How does a turbo work then?  I assume that 10 PSI boost means that the
> manifold pressure is 10 PSI greater than the atmosphere pressure.  So
> wouldn't that mean that you are still making less power at altitude than at
> sea level?

I think so, but I believe some modern electronically-controlled turbos
compensate for this by raising the boost pressure.  I think some
turbocharged airplanes have manually-operated wastegates for the same
reason.

I admit I've never had a turbocharged car (or airplane!), though, so I
could be totally wrong.