Standard pressure and temperature

[Huw Powell]

> >  This can make a big difference - at 100 degrees F and 10,000 feet
> (altitude
> >  of Leadville, CO, for instance), the density altitude is now equivalent
> to
> >  about 15,000 feet, and the outside air pressure is only 15 inches of
> >  mercury, which means we need THREE bar showing on the boost gauge to get
> >  sea level air pressure (1 bar) plus .5 bar boost (total 1.5 bar) in the
> >  manifold and thus sea level performance.

can you even *breathe* at 0.5 bar???

and

Isn't the gauge absolute?  doesn't it simply measure the pressure in the
manifold relative to a spring or some such?  It seems odd that it would
be calibrated so 1 bar on it is equal to "whatever is outside"...

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/