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Old 07-21-2013, 08:57 PM
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Graham Graham is offline
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Join Date: Nov 2004
Location: Ontario, Canada
Posts: 3,939
Originally Posted by JamesDean View Post
If the turbo pushes too much pressure the valve is opened and allows boost to push down on the ALDA cutting back fuel, which will in turn cut back boost..

MB presumably put the overboost valve there as a secondary safety control to limit the boost pressure that the ALDA would see and therefore limit the amount of fuel that can be injected in the event that the wastegate (the primary boost control) failed closed (unlikely)

It is no big deal to have a valve properly connected and working. For it to work, there is a pressure sensor that must also be working.

There should be no problem to run with valve bypassed for short periods. I have heard that many owners run that way all the time!
85 300D,72 350SL, 98 E320, Outback 2.5
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