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BOV Test?

What is the simplest way of testing the operation of the BOV. Mine came with 4 springs.

Old 07-03-2012, 10:37 AM
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a mighty vac.
Old 07-03-2012, 11:03 AM
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ok..ty with 4 different springs which all have a different a loading, how can I tell if the valve is openeing fully?
Old 07-03-2012, 11:57 AM
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Two ways: Take the waste gate off the car and bench test it. But understand that it will take a few additional pounds of air pressure over the spring setting (i.e., if you have a .8 bar spring, the WG may not actually open until .9 or maybe even 1.0 bar). This is because when on the car it gets an additive affect from the exhaust pressure.

Or, pull off the WG muffler or waste pipe (whatever you have installed) and if I recall you can see the valve through the opening. Start the car and apply controlled air pressure to the WG, and observe it's opening.
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Old 07-03-2012, 03:24 PM
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BOV in the manifold? Or the wastegate that Mark is talking about? What year?
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Old 07-03-2012, 03:46 PM
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bov or wastegate?
Old 07-03-2012, 05:20 PM
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Jeeze guys, I had WG on the brain. In the immortal words of Rosanne Rosannadanna...."never mind"!

I've never heard of anyone installing anything but a stock spring in the stock 930 manifold/boost recirculation valve...and there's really no reason to do so. So...so....are we really talking wastegate, the thingy that lets exhaust pressure bypass the turbo to control the level of boost?
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Old 07-03-2012, 05:30 PM
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BOV / recirculating valve. Not the Waistegate . That is working fine.
Old 07-03-2012, 09:52 PM
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So I have been running some tests with the different BOV springs. The strongest spring keeps the BOV closed under idle and acceleration but as soon as I come off the gas the vacuum pulls the valve open. The second strongest spring allows the BOV to stay slightly open under idle but closes under acceleration and opens up again once off throttle. Which spring is giving me the correct operation of the BOV?

Old 07-06-2012, 09:09 AM
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