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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,565

Much better way of checking overboost switch functionality is by doing it in-car. We do it often in the shop in dealership I work for. We have a big cylinder with a nipple that we connect to some rubber hose near the intake (on other side of rubber hose going to turbo-intake for example). Then we pressurize the whole intake to 0.8 bar (or what the typical boost is for the car).

First and foremost, we listen for leaks in the intake assembly and tighten it. Then you can raise the pressure to 1.1 bar while looking at ohmmeter connected to boost witch and check that it trips around 1.1 bar.

That way you can check for intake/intercooer leaks and test overboost switch without deassembling anything. Any bigger shoup should have this setup, consisting of three-four nippled cylinders of different diameters, pressure regulator, big boost gauge and a nipple to connect to shop-air.
Thank you for your time,
Old 09-15-2007, 04:23 AM
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