the mk1 kid
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- Jul 28, 2006
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I'll try and clarify things for you.
To keep things simple consider two groups of moving gas, exhaust and boost.
The boost is clean air sucked into air filter, through the turbo and pushed around the boost pipes through the intercooler and eventually into the inlet manifold that sits on the engine (big shiny allow thing, says 'turbo ie')
Exhaust gases are whats left after combustion and they exit the engine via the exhaust valves they then pass through the exhaust manifold and into the other side of the turbo before finally leaving through the exhaust system.
The turbo has two sides, hot and cold nicked name that way for obvious reasons! The cold side flows the boost and the hot deals with exhaust. The turbos two half's can be considered seperate for simplicity and no gas can flow between the two in any case.
That should give you a basic understanding so i'll explain about dump valves and wastegates now.
The wastegate is built into the hot side (exhaust side) of your turbo and does not come in contact with any cold air the flow into the engine. The vast majority of turbos have them built in its not a performance mod to add one and you cant remove it (pease no one bring up EWG's!!). However and this is the bit that will confuse you if any: The wastegates job is to determine how much boost the turbo is to run. It does this by allowing exhaust gases to pass by the turbo's turbine blades and straight into the exhaust system thus not contributing at all. So in english its a little flap that opens, how its does so can be left for another time i think!
All (most at least) petrol turbo'd cars come with a silent dump valve (recirulating). Its job is to stop boost (cold new air) damaging the turbo when its entry to the engine is halted due to a lift off of the throttle.
So both the dv and wg are needed and carry out completely seperate jobs.
If you didnt have a dumpvalve you might hear a fluttering noise, this is the compressor (cold side wheel) stalling at the boost returns and hits the veins going the wrong way. Its the reason you have a dv and prevents large forces loading the bearings and wearing it out your turbo prematurely.
Any questions?
Tom
To keep things simple consider two groups of moving gas, exhaust and boost.
The boost is clean air sucked into air filter, through the turbo and pushed around the boost pipes through the intercooler and eventually into the inlet manifold that sits on the engine (big shiny allow thing, says 'turbo ie')
Exhaust gases are whats left after combustion and they exit the engine via the exhaust valves they then pass through the exhaust manifold and into the other side of the turbo before finally leaving through the exhaust system.
The turbo has two sides, hot and cold nicked name that way for obvious reasons! The cold side flows the boost and the hot deals with exhaust. The turbos two half's can be considered seperate for simplicity and no gas can flow between the two in any case.
That should give you a basic understanding so i'll explain about dump valves and wastegates now.
The wastegate is built into the hot side (exhaust side) of your turbo and does not come in contact with any cold air the flow into the engine. The vast majority of turbos have them built in its not a performance mod to add one and you cant remove it (pease no one bring up EWG's!!). However and this is the bit that will confuse you if any: The wastegates job is to determine how much boost the turbo is to run. It does this by allowing exhaust gases to pass by the turbo's turbine blades and straight into the exhaust system thus not contributing at all. So in english its a little flap that opens, how its does so can be left for another time i think!
All (most at least) petrol turbo'd cars come with a silent dump valve (recirulating). Its job is to stop boost (cold new air) damaging the turbo when its entry to the engine is halted due to a lift off of the throttle.
So both the dv and wg are needed and carry out completely seperate jobs.
If you didnt have a dumpvalve you might hear a fluttering noise, this is the compressor (cold side wheel) stalling at the boost returns and hits the veins going the wrong way. Its the reason you have a dv and prevents large forces loading the bearings and wearing it out your turbo prematurely.
Any questions?
Tom
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