Re: 91 200'isms

[Robert Myers <rmyers@wvit.wvnet.edu>]

Albert,

It would make sense for there to be some sort of ambient air pressure
measurement to allow better boost control.  But at lower ambient pressures
you'd want the wastegate to stay closed longer, not open sooner.  Part of
the "spring" holding the wastegate closed is atmospheric back pressure.  At
lower ambient pressures (higher altitude) you need a stiffer spring to
maintain the same absolute manifold pressure.

Is this 18 cents short of a paradigm?  :-)

At 12:41 PM 3/16/96 -0500, you wrote:
>
>Just my little something about this topic. I heard from somewhere a while 
>ago that all the Audi 5kt car has a altitude sensor. If the car is operating 
>at a certain altitude, the sensor will kick on and send signal to somewhere 
>to fully open the wastegate. I don't know why they doing this, but, by my
          ^^^^^^^^^^^^^^^^^^

                 ???

>guess, is that they want to keep the turbo spin slower since on a higher 
>altitude the air density is lessen and the turbo will spin fast.  
>
>
>Albert Ng
>'87 5kcst

---snip---

___
	Bob 
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