fuel pressure vs altitude

[Moofaloof at aol.com]

Hi ...
I think what you might be after are a few simple formulae for typical rates 
of change of density vs altitude for a standard atmosphere.  You can find 
such formulae at:

http://www.best.com/~williams/avform.htm#Altimetry

jc
-------------------



In a message dated 5/11/00 11:00:08 AM Atlantic Daylight Time, 
Flanagas at mail1.monmouth.army.mil writes:

> Some of you aviation enthusiasts (Gar for one) might be able to give
>  some incite.
>  
>  I am working on designing a system that will automatically change
>  my fuel pressure relative to different air densities.  I am going
>  to use this system on a turbo car that is controlled with a digital
>  fuel injection system.  Therefore, no mass air or air density 
>  components in the normal loop.
>  
>  The electronics side should not be that bad but the algorithm that will
>  control the system is where I do not have enough knowledge.
>  
>  The question I have for the group is how much should the fuel pressure
>  be dropped for each increment in altitude change, i.e. say car is
>  running perfect at sea level (perfect A/F ratio) and for argument sake 
>  the density altitude is also at sea level, when I change to a higher 
>  altitude area with different weather conditions, what is the ball park % 
>  of fuel that should be removed for each 1000ft change in density altitude.
>  
>  Is there any literature out there that I could get my hands on that will 
>  educate me in this area?
>  
>  Thanks
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