The turbo gauge measures turbine speed, right?
From: nessa@mentor.cc.purdue.edu (Vanessa M. Cook) Subject: Re: Turbo Gauge … To: swedishbricks@me.rochester.edu (Volvo-Net) Date: Mon, 29 Mar 93 8:39:38 EST George Chow writes… { The turbo gauge measures turbine speed, right? Anyone know what calibration { should be on the turbo gauge? What is the cross-over from black to white? No. The boost gauge measures the amount of pressure in the intake manifold. The cross over from black to white is supposed to be when you go from manifold vacuum to positive manifold pressure. When you rev the engine, for example, the gauge swings up on the pedal depression and then immediately drops back down as soon as the engine speed stops accellerating upward. However, the turbine is still spinning very fast at this point, even though the boost is back at idle vacuum. That is why you aren’t supposed to rev the engine before shutting it off. About the worst thing you could do. Unless you were to be under full load, just off the motorway, and then shut
