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Manifold vacuum
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Posted by AP [Email] (more from AP) on Tue, 8 Feb 2005 08:34:55 Share Post by Email
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I put a turbo gauge cluster in my 91 900S 2.1 over the weekend because I figured it would be pretty easy (it was)

So I have a turbo/apc gauge now..

It reads vacuum and boost, and I certianly have vacuum so I figure the gauge is atleast half useful. Its operation is pretty facinating to me and I have a question of two.

It seems like the vacuum is a pretty good indicator of engine load. If I'm driving around I can get a rough idea of how much more the engine is able to provide.

Sometimes I have almost no vacuum and I don't have the throttle open all that much, obviously at that point...opening the throttle the rest of the way yields very little extra acceleration...then sometimes it seems like I have the throttle nearly planted and and am at relatively low vacuum and a slight increase in throttle (to full) makes a big difference.

Is this related to RPM, the hills, what else?
Whats the relationship here?
When I watch the gauge what am I actualy watching?


I think I'm going to put a turbo on my car just so I can watch the gauge.

I've never driven a turbo classic 900! This is so cool!

heh, anybody in atlanta want to take me for a ride in their turbo 900?


<gripe> why does the 1999 9-5 not have a boost gauge? Thats so dumb!</gripe>

posted by 168.30.18...

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