Boost gauges, 5KCSTQ

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Fri, 24 Mar 1995, Arun Rao wrote:

> > gauge actually elctronically measures manifold pressure, not true boost
> > pressure.  .... [ stuff deleted ]
> >
> >-- End of excerpt from Steve Marinello
> 
> 	OK, I'll bite ... what's the difference? Naively, it would
> 	seem that boost pressure would just be the difference between
> 	atmospheric pressure and manifold pressure: if my gauge says
> 	1.4, the boost pressure is 0.4.  In any case, isn't it the
> 	manifold pressure that counts?
> 
> 	-Arun

Arun,

	I installed an Autometer boost gauge, and found that the stock 
digital gauge in the centre console is fairly accurate but it lags 
behind actual boost pressure by a few tenths of a second.  Also, 
since it measures in tenths of a bar, the resolution is fairly 
coarse.  The Autometer boost gauge measures psi, and 
realistically, I can read it to within a 1/2 psi.  Compared to 
roughly 1.5psi per .1 bar, there is quite a difference in 
resolution.  I like the Autometer boost gauge alot better.

Later,
Graydon D. Stuckey

'86 Audi 5000 CS Turbo Quattro		'83 Mazda RX7, SCCA Solo II F-Prepared
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