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Date: Sat, 25 Mar 2006 20:55:02 GMT
From: "Al" <alistairdorenospamo.com>
Subject: Re: boost gauges and calibration


"ShazWozza" <shaz_wozzanospamentspring.com> wrote in message news:newscache$6d6mwi$g2t$1nospame.onthenet.com.au... > 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. OK I admit to having a calibrated boost gauge. I am happy with PSI or Bar, and every site and news group I've visited to help me sort out my boost problems talks about setting base boost at about .35 Bar. Now I'm quite good with numbers, and can see patterns and sometimes even colours in a sheet of figures. (Red comes to mind when I'm looking at credit card statements!) I haven't yet found a site which tells me where 0.35 Bar is on the Saab Gauge. So yes I have an elkparts calibrated boost gauge, in a pod on top of the dash, as many many UK saabers do. I did go to the local "performance" parts store, but made a sharp exit when I was offered "pink or blue back light sir?" The gauge helps me to reset base boost every now and then, and doesn't look too shady... I've seen this expression "ricer" before and whilst I'm willing to admit, that as a normal man I have been known have a "Tommy Tank" occasionally, I'm not willing to admit to being a ricer until I know what one is. Could you enlighten us please? Cheers Al

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