Boost levels

[Robert Deis]

On Thu, 3 May 2001, Scott wrote:
>
> Essentially the turbo is adding an additional %40 air to the cylinder. To 
> get 1.4 bar at altitude you would need to add %65 more air to the cylinder.
> This would require the turbo working %63 harder.
> 
> That could very well be overspeed.

Sure it could- and that's why most boost control systems work based on
gauge pressure, not absolute pressure.

But it's been advertised that Audi systems work on absolute pressure-
meaning that 1.4 bar is what you get be it sea level ot 14000 feet.  Is
this true or not?

-- 
------------------------------------------------------------------------------
  Rob Deis                  "Let the people know beforehand what the law
  MiB3347                      is and what they are to expect." 
  rdeis at io.com                              -- 18th Congress, Rec. 75