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  #1  
Old 02-19-2011, 11:49 AM
Olivier's Avatar
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Question High Boost Atmospheric BOV Turbo Dump Valve

Hello all,

Is that any good as a MOD, or not really? When I left the throttle I do hear a loud woosshhh sound, would that be the air coming back to the turbo? Will this prevent it and stop a bit the turbo lag?
THis is for a E300 Turbo diesel.
Cheers.

http://cgi.ebay.co.uk/High-Boost-Atmospheric-BOV-Turbo-Dump-Valve-30mm-Inlet-/380314811655?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item588c877d07

wiki:
http://en.wikipedia.org/wiki/Blowoff_valve
Blowoff valves are used to prevent compressor surge, a phenomenon that readily occurs when lifting off the throttle of an unvented, turbocharged engine. When the throttle plate on a turbocharged engine closes, the high pressure air in the intake system is trapped by the throttle and a pressure wave is forced back into the compressor. The compressor wheel slows rapidly and may even stall, and the driver will notice a fluttering air sound. The rapid slowing or stalling stresses the turbo and imparts severe turbo lag if the driver accelerates immediately after the surge event.

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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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Old 02-19-2011, 12:40 PM
aaa aaa is offline
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Woosh doesn't sound like the sound this is supposed to solve. Plus these are designed for gassers, you don't even have a throttle plate for one.
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Old 02-19-2011, 12:48 PM
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Aaa, not for diesel then? Why not? I know the throttle is always open but if the valves are close the pressurised air as to go somewhere?
The sound is a funny one one, hard to tell, wwoooshh, a bit like something sucking in too, when the waste gate open I guess. I thought it might be the turbo lowering its speed with the air going backward like explained on wiki...
Cheers.
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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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Old 02-19-2011, 12:52 PM
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The pedal doesn't close the valves. Airflow through the engine will decrease with RPMs, and the turbo will decelerate with it.

As said, blowoff valves are for throttled engines (gasoline).
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Old 02-19-2011, 01:03 PM
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OK, thank you.
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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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  #6  
Old 04-25-2011, 02:01 AM
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I sense something… a presence I've not felt since…
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Old 04-25-2011, 11:33 AM
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its wierd i was thinking the same thing...
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Old 08-09-2011, 02:16 AM
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Quote:
Originally Posted by Olivier View Post
When I left the throttle I do hear a loud woosshhh sound, would that be the air coming back to the turbo?
Like this? http://www.youtube.com/watch?v=6y_tbIStALM
The solution is to stop lifting the accelerator suddenly.

That said, there IS a use for an air recirculation valve to prevent surge. I have one on my engine because the turbo spools up too fast and surges when the engine is below 2000rpm. I had Bob (techguy512) modify one of his tach amps to control a solenoid that activates the ARV based only on engine RPM.
http://mercedesforum.com/forum/diesel-performance-49/forcedinductions-gt2356v-hybrid-vnt-turbo-48247/#post150502


The black can is a muffler. No ricer BOV farts allowed here.

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