pagey
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Registered: 30th Nov 04
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This may sound daft, is it possible to get the chatter out of a let engine without using an external wastegate? At the mo ive got an 8.1 litre intercooler to go on and am running a hybrid turbo unit, standard boost. Will it make any difference if i remove the dump valve to get that noise? Post any vids ..... you tube etc...
[Edited on 05-11-2007 by pagey]
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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turbo stall
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pagey
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Registered: 30th Nov 04
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turbo stall? what?
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K3 VMU
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Registered: 28th Jul 06
Location: Portlethen, Aberdeen,ken
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takin off the dump valve will help make your aquired noise
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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http://www.youtube.com/watch?v=OuNTnA5A2Fo
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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http://www.youtube.com/watch?v=yMCrvlUTIgA
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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read http://www.turbominis.co.uk/forums/index.php?p=vt&tid=1919
http://en.wikipedia.org/wiki/Wastegate
http://google.mg-rover.org/showthread.php?p=30408
and generally http://www.google.co.uk/search?hl=en&q=wastegate+chatter&meta=
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pagey
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Registered: 30th Nov 04
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K3vmu, will it be noticeable as its an internal wastegate or doesnt that make any difference? taking off dump valve wont cause any damage to anything?
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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you dont want it, it makes the turbo less efficient and puts extra strain on it increasing wear.
iv heard of turbos shedding blades through turbo stall although thats very unlikely
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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Wastegate chatter myth
There is a common myth in the automotive world about so called "wastegate chatter" or "turbo flutter", a noise created on lifting off the throttle in a turbocharged car. The sound is commonly described as a chipmunk or a rattlesnake and is often stated incorrectly as being a result of the turbo's wastegate closing.
The noise is in fact the air compressed by the turbo passing back through the compressor wheel of the turbo after the airflow is abruptly halted by the throttle plate closing. However, in some cases, i.e. where it doesn't open fast enough or is set up to only react to high boost, some chatter will remain. Surge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed. Diesels have no use for a Blow off Valve as they do not have a throttle.
The chatter noise is very noticeable on WRC Rally cars, where no BOV is allowed.
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pagey
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Registered: 30th Nov 04
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Cheers AK, why would rc cars have turbo stall tho:/
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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The chatter noise is very noticeable on WRC Rally cars, where no BOV is allowed.
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pagey
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Registered: 30th Nov 04
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so in a nutshell, its best to run a dump valve to protect unneccessary wear to the turbo, the noise sounds nice but ive just had a turbo recon and the pain in the ass removing it and putting it back in! so think il stick with the dump valve noise.
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pagey
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Registered: 30th Nov 04
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so there isnt a way of doing it that will keep the let engine reliable and good boost pressures etc..
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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yeah run a dv your engine was designed to have one
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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i dont believe its true about the DV/BOV not being allowed in WRC by the way...
Need to learn about AntiLag etc
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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are wrc's allowed external wastegates?
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jr
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Registered: 20th May 02
Location: Kent
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as said, its not wastegate chatter 
yes steve i belive so
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ShEp
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Registered: 9th Aug 05
Location: Dingwall, Highland
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quote:
Originally posted by AK
i dont believe its true about the DV/BOV not being allowed in WRC by the way...
Need to learn about AntiLag etc
does wrc not allow the in-built recirc valves?
i'd find it hard to believe that they're not allowed anything at all, just damages the turbo
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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they have antilag which keeps the turbo spinning....
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Nic Barnes
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Registered: 5th Apr 04
Location: nowhere near ginger people
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wastegate on the inlet is the future
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phil_sutton
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Registered: 8th Sep 07
Location: Nottingham
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^^ you stole my idea lol, also wastegates and dumpvlaves / bov have nothing to do with one another.
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Nic Barnes
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Registered: 5th Apr 04
Location: nowhere near ginger people
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remember that white mk1 escort cossie that was at ten of the best? that was my mates brothers, his cossie motor in his bedford van has the wastegate on the inlet.
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phil_sutton
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Registered: 8th Sep 07
Location: Nottingham
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ghey that close an i didnt even notice, doesnt matter as I got a well bo BOV instead which will get me more respeck at KFC lol
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ed
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Registered: 10th Sep 03
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quote:
Originally posted by pagey
K3vmu, will it be noticeable as its an internal wastegate or doesnt that make any difference? taking off dump valve wont cause any damage to anything?
No it will more than likely induce drag. It's not a very good thing to do really.
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