boost guage and zener diode questions...

[Alex Kowalski]

Jason wrote:

>i ask cuz i finally got around to hooking up my
>aftermarket boost guage, and the numbers
>certainly are not jiving.

>in fact, they're not even consistently not
>jiving.  sometimes the digital guage will show
>1.2BAR, and the new guage shows 3psi, while other
>times it may show 6psi.

>weird.

Nope, it's working perfectly.  Atmospheric pressure is 14.7 PSI and the
dashboard boost gauge reads manifold pressure with the atmosphere = 1 BAR.
That's why it shows less than 1 BAR when the throttle is closed, indicating
vacuum.  Therefore 1.2BAR on the dashboard is about 3 psi of boost and you
shouldn't see more than about 8 psi before you hit the fuel pump cutoff. ~ 6
PSI sounds about right for an MC1 that is functioning relatively normally,
that would be 1.4 BAR on the dash gauge.

Zener help in Canada is going to have to come from someone else...  ;)

Cheers
Alex Kowalski
'87 5KCSTQ
'86 5KCSTQ