Wastegate

[Djd085]

What's the deal with an external wastegate on a duramax? If it sounds good on a Subaru, I can only image it on a truck.


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[moparkxracer]

I can't hear my wastegate, are you thinking abt a blowoff valve?

 

[Djd085]

No. An external waste gate.


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[Robby05]

What's the deal with an external wastegate on a duramax? If it sounds good on a Subaru, I can only image it on a truck.


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What?...

 

[Djd085]

The waste gate on the turbo opens and lets exhaust gas bypass the turbine, and back into the downpipe. Is this not the same in duramax-land?


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[mike diesel]

He's probably talking about a screamer pipe.

smh this thread is a major fail.

 

[mike diesel]

The waste gate on the turbo opens and lets exhaust gas bypass the turbine, and back into the downpipe. Is this not the same in duramax-land?


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How will you hear it if it just reverts back to the down pipe..? All it will sound like is exhaust noise?? Confused

 

[Djd085]

I've owned an STi and wrx before this duramax.


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[Djd085]

Stock is internal wastegate, I'm asking if anyone does external wastegates.


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[mike diesel]

Stock is internal wastegate, I'm asking if anyone does external wastegates.


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What's the difference? Both do the same thing, bypass exhaust flow around the turbine...Plenty of people do external gates.

 

[mike diesel]

Stock is internal wastegate, I'm asking if anyone does external wastegates.


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Only 01-04 dmax have an internal gate. The rest are all vvt.

 

[Djd085]

Well in my STi an external wastegate fixed boost spike and held constant psi. With the stock internal wastegate, it was too small and caused it to over boost.


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[moparkxracer]

I have 3 external gates, I can't hear them. They plumb back into exhaust.

 

[Djd085]

I didn't know if it was beneficial. Don't hate on the new guy.


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[Djd085]

I have 3 external gates, I can't hear them. They plumb back into exhaust.

Wow.


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[mike diesel]

Well in my STi an external wastegate fixed boost spike and held constant psi. With the stock internal wastegate, it was too small and caused it to over boost.


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Diesel doesnt really care about boost spikes. We don't "go lean" from it. The gate on a diesel is mainly to keep the turbo in its map and to relieve excess drive pressure.

 

[Djd085]

Diesel doesnt really care about boost spikes. We don't "go lean" from it. The gate on a diesel is mainly to keep the turbo in its map and to relieve excess drive pressure.

Makes sense. Thanks a lot! Subarus go real lean.


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[mike diesel]

Diesel are a lean burn engine to begin with. Diesel and gas are 2 different animals.

 

[Chevy1925]

I suggest you don't turn your boost higher than 32psi OP. Beyond that you will blow that turbo.