Date: 15 Jan 2003 01:02:52 -0800 From: rjtnopsamcam.ac.uk (Roberto) Subject: Re: 9-5 Aero Raves & Rants (mostly rants)
Goran, your information about the boost gauge is interesting but it poses some questions in my mind, You pointed: > The goal to control torque is also reflected in the "Turbo" > gauge, it does not indicate turbo pressure, as it does in older > Saabs using a mechanical gauge, instead it is an electrical gauge > showing the air mass that has been let into the cylinders. If this is the case, why the behaviour of the gauge in the 9-5 seems identical to that of the old 900 one? I mean in the boost gauge of the old 900 we have: 1 - The rest position with engine off is between white and yellow and represents the atmospheric pressure. 2 - Engine on and low loads, needle moving in the white region corresponding to intake manifold pressure below atmospheric. The lower the load the lower the pressure, i.e. needle further to the left. This is like in a normally aspirated engine. 3 - High loads, needle moving in the yellow area indicating different level of boost over atmospheric pressure. My question is: If in the 9-5 the boost gauge is indicating air mass flow, why its rest point does not correspond to the zero position? In other words, when the engine is off the needle should be completely to the left indicating zero flow and showing the zero of the indicator. I guess that your answer will be that a voltage bias is included when the engine starts. I will try to find time to connect a mechanical boost gauge and do some driving to see how the true boost performs in the 9-5. Any suggestion were to connect the tube? Roberto 84 900T16 200,000miles 92 9-5 Aero 7000miles
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