Re: High Pitched Whirring / Turbo Kicks '99 93seHOT 30K - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: High Pitched Whirring / Turbo Kicks '99 93seHOT 30K
Posted by Dean (more from Dean) on Mon, 22 Jan 2001 10:00:18
In Reply to: High Pitched Whirring / Turbo Kicks '99 93seHOT 30K, Bleeneste, Mon, 22 Jan 2001 08:45:25
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If your boost is and performance are good, then I expect that there is not a problem with leaking hose clamp joints etc.
I would inspect the hose joints from the turbo to the air box, and check that there really is a filter in the air box. Air box properly clamped shut?
Check that the bypass valve discharge hose is propery connected at each end. Check that the vacuum line for the bypass valve is intact, check for split ends at each end.
If boost is not as good as it should be, perhaps the bypass valve is leaking. Check for a failed diaphragm. Check hose clamps and joints etc.
Turbine noise can come through the bypass valve, via the disharge hose and intake system. The air box and air filter do tend to filter some of this noise out. As you get on boost, the bypass valve should be closed which cuts off this accoustic path. Look for reasons that this noise is not been filtered out, or that the valve is not operating properly.
As you transition through the high white zone, the turbine is starting to spin up and make noise, but the valve should be closing. So this is where one would expect to hear the turbine. On a stock system, this would hardly be heard at all. With a modified air box and K&N, you would hear this noise, but never to the exent that anyone has complained about it.
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