Date: Fri, 24 Mar 2006 04:12:42 GMT From: ShazWozza <shaz_wozzanospamentspring.com> Subject: Re: boost gauges and calibration
Craig's Saab C900 Site wrote: > Since we're talking about turbo boost gauges, etc. and what happens when > the vacuum hose is not doing it's job, are the stock gauges that Saab puts > into the instrument clusters actually calibrated in a way that makes > sense? > it's fine to say 'dont take it into the red' but that means nothing to > most people. 8-) When I've had the engine running in the 1983 8V turbo car > I'm repairing, it's a bit confusing with the way the needle changes > position depending on how much throttle the engine is given, etc. Once I > get it roadworthy again (still needs tie-rod ends, ball joints and inner > CV boots to be replaced first), I'll take it for a proper drive on the > local road at a quiet time of the day to figure out what the turbo does > (or doesn't do). If it doesn't make sense it is probably because you don't understand what it is measuring. The gauge measures vacuum and boost. When it is at rest (engine off) then it should be displaying atmospheric pressure. Anything below this rest position is vacuum, anything above is positive pressure (boost). Colour calibration makes much more sense than numbers. What are you going to calibrate it in? Bars, PSI, Pascals. What meaning do those calibrations have to most people? SFA. It is much easier to see that the guage is in the "yellow" and know that is operating on moderate boost. Excursions into the "red" are perfectly normal by the way. > > I guess it's one reason people fit boost gauges with properly calibrated > scales. They would most likely be ricer type wankers.
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