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Winger
Site Moderator
Member Since: 15 Feb 2005
Location: UK
Posts: 3308
 
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Asking questions like that might scare the chap away..........I suggest a search of his posts will confirm your enquiry, based on their content.
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 Mon Aug 28 2006 7:42am |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 15752
  
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My D3 makes a slight rasping sound on throttle off, as far as I know, it is the turbo wastegate opening and 'dumping' the pressure on the exhaust side of the turbo. I think all turbo charged engines do this, some are very noisy indeed! just listen to the noise when a wrc rally car lifts off the throttle!
Mine has done this from day1 and now has 52k miles and its no worse than when new. I am not aware of a rattle though. Club 18 - 30 (I wish !!)
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| Mon Aug 28 2006 8:11am |
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catoperator
Member Since: 29 Jan 2006
Location: hampshire
Posts: 149
 
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a few causes of turbo noise
Obstructed air intake duct to turbo compressor.
Remove obstruction or replace damaged parts as required.
Obstructed air outlet duct from compressor to intake manifold.
Remove obstruction or replace damaged parts as required.
Obstructed intake manifold
Refer to engine manufacturers manual & remove obstruction.
Air leak in duct from air cleaner to compressor.
Correct leak by replacing seals or tightening fasteners as required.
Air leak in duct from compressor intake manifold.
Correct leak by replacing seals or tightening fasteners as required.
Air leak at intake manifold to engine joint.
Refer to manufacturers manual & replace gaskets or tighten fasteners as required.
Obstruction in exhaust manifold.
Refer to engine manufacturers manual & remove obstruction.
Gas leak in exhaust manifolds to engine joint.
Refer to manufacturers manual & replace gaskets or tighten fasteners as required.
Gas leak in turbine inlet to exhaust manifold joint.
Replace gasket or tighten fasteners as required.
Gas leak in ducting after the turbine outlet.
Refer to manufacturers manual & repair leak.
Dirt caked on compressor wheel and / or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required
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| Mon Aug 28 2006 9:09am |
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PSC
Member Since: 01 May 2006
Location: Johannesburg
Posts: 192
 
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catoperator wrote: i never heard of a electric motor in a turbo i would like to see more info on this if anyone has any thanks
It is a BorgWarner (KKK) BV50 controlled by electrical actuators, there is a tiny picture of a unit in the 02/2004 BW newsletter . Porsche use the same size unit on the new 911 Turbo ....
-- Paul
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| Mon Aug 28 2006 10:29am |
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PSC
Member Since: 01 May 2006
Location: Johannesburg
Posts: 192
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Gareth wrote:I think all turbo charged engines do this, some are very noisy indeed! just listen to the noise when a wrc rally car lifts off the throttle!
There are two dump systems on petrol vehicles, the exhaust pressure which is used to control boost (wastegate) and the DV (dump valve) which can be either closed or open circuit (the noisy type) and is activated by the build up of pressure when the throttle flap is closed. The pressure if not released causes the turbo unit to become unstable.
Most diesel engines are not throttled (hence the good economy and low pumpimg losses on part throttle), so they dont need a dump valve.
-- Paul
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| Mon Aug 28 2006 10:43am |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 15752
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OK I get it now. I don't have a wastegate or a dump valve, therefore I too have a mystery noise on throttle off.
It has not got any worse and I did not even think about it until reading this post. Club 18 - 30 (I wish !!)
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| Mon Aug 28 2006 4:44pm |
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jacob
Member Since: 12 Jan 2006
Location: athens
Posts: 145
 
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hello there.
i have this noise on throttle off as well, and is more hearable
while you drive in narrow places(like some protective concreate fenders
at the side of the roads.)
any ideas what this might be ??
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| Tue Aug 29 2006 10:16am |
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offroad junky
Member Since: 23 Dec 2011
Location: Port Elizabeth, Eastern Cape
Posts: 5
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Our D3 started with this a while back and it is progressively getting worse. While driving on a straight road or slight downhill and you are just just maintaining speed, not coasting or exellerating, there is an irritating rattle almost like a bearing thats gone on a shaft.....
The slightest incline and the turbo goes into boost, it's quiet and if you take your foot off the exelerator it is qiuet. I had it by the stealers and the workshop supervisor drove with it and he tells me not to worry about it because his does the same and that it is only the VVT linkages rattleing like that and there is nothing they can do to fix it. Not even tightening it up because then the VVT linkages don't work like it should....
Any one out there with the same problem and if so, what did you do to fix the problem....?
P.S.....
Well, just some history on my D3....the previous 'ignorent owner' had 4 different tyres on the D3 and caused so much propshaft wind-up that the right front universal joint as well as the front diff broke and was replaced by LR agents here in PE. The rear diff has a slight humm in it as well. I was thinking that rattle sound might have been one of the output shaft bearings on the transfer case but the LR workshop supervisor said that if it was the bearing, it will make a LOT more noise and will I hear it....
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| Fri Jan 20 2012 8:55am |
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