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Internal or External Wastegate? 

 

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 Post subject: Internal or External Wastegate?
Posted: Sun Dec 17, 2006 7:09 pm 
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What are the differences and benefits for internal and external wastegates? Do more people use external wastegates?

 

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Posted: Sun Dec 17, 2006 7:41 pm 
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More people use external wastegates and from what i have read external is better. I think external can handle more boost, there were a few other reasons but I cant remember them right now. Something about boost spikes I think.

 

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Posted: Sun Dec 17, 2006 8:08 pm 
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Internal is cheap and easy and suits low power applications. external is better because large valve sizes are available which means they suit higher power setups. downsides of external are they take up more space and cost more.

 

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Posted: Sun Dec 17, 2006 8:52 pm 
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can you get internal that make that blowoff noise? cause i think external ones are illegal from the EPA cause any atmospheric gases, burnt or not must pass through the cat

 

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Posted: Sun Dec 17, 2006 8:59 pm 
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fiftyone wrote:
can you get internal that make that blowoff noise? cause i think external ones are illegal from the EPA cause any atmospheric gases, burnt or not must pass through the cat


thats the blow off valve, not the wastegate.
wastegates vent exhaust gasses, externally venting ones are pretty damn loud and generally reffered to as screamer pipes.

 

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Posted: Sun Dec 17, 2006 9:41 pm 
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you just plum back the wastegate back before the cat.

 

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Posted: Sun Dec 17, 2006 9:54 pm 
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correct.. or i have seen after the cat on a fully complianced turbo car.

 

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Posted: Sun Dec 17, 2006 11:02 pm 
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so a blow off lets excess boost vent to keep the turbo spooling and a wastegate vents the zorst around the turbo for when s**t loads of boost isnt needed?

 

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Posted: Sun Dec 17, 2006 11:35 pm 
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basically yes

 

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 Post subject: max boost out of internal
Posted: Mon Dec 18, 2006 11:56 pm 
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hey there,anyone know what the max boost an internal wastegate turbo can usually handle in a new condition,thanks
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Posted: Tue Dec 19, 2006 12:16 am 
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that depends on the turbo. it has a lot to do with the compressor size and the a/r ratios. Also depends on when the turbo is efficient.
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 Post subject: thanks
Posted: Tue Dec 19, 2006 8:18 am 
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hey mate,thanks for that,appreciate it
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