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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Does the 335D have a diverter valve ?



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      06-18-2012, 04:13 AM   #1
335DEE
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Does the 335D have a diverter valve ?

Lots of people having issues with power problems and lots of different types of fixes to resolve these problems ( Red hose , vac hoses , pressure converters etc etc ), but no one has suggested a leaky diverter valve.

If there is no diverter valve then how does the charged air get dealt with on throttle lift when the system is on boost ??
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      06-18-2012, 04:47 AM   #2
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The 335d has a turbine control valve and a wastegate.

Quote:
Turbine Control Valve
The turbine control valve opens a bypass channel on the exhaust side to the low pressure stage (past the high pressure stage). It is operated pneumatically by a vacuum unit and can be variably adjusted. An Electro-pneumatic pressure converter (EPDW) applies vacuum to the vacuum unit. In development, the turbine control valve is referred to as the main control valve.
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Wastegate
On reaching the nominal engine output, the wastegate opens to avoid high boost and turbine pressures. A part of the exhaust gas flows via the tailgate past the turbine of the low pressure stage. It is operated pneumatically by a vacuum unit. The wastegate can be variable adjusted.
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      06-18-2012, 05:11 AM   #3
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How very thorough ! . I'm interested in the
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Originally Posted by HighlandPete View Post
The turbine control valve opens a bypass channel on the exhaust side
and where or what this device is and if it is possible to service or replace.
I have just renewed the EPDW's and vac hoses but do not think this bypass channel is opening correctly. Slight turbine chatter on lift off especially when cold and a "CHAIO" sound , also spooling up doesn't quite sound right ( no nice smooth sounding hiss increasing in pitch ) sounds more hollow is that's a good word to describe. BTW this isn't pedal to the metal stuff , but very low revs and slow speeds.
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