where's the Whooosh?

[imjester77]

I know that the new diesel has a built in (well), Everything, but can i get a whistle or a whoosh from time to time so i can hear that blowoff valve release even just a little more than a Spppff.? BTW, this was a partly serious question.

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[Gorilla57]

Diesels don't have a blow-off valve because there is no throttle body.

 

[Sydwaiz]

You would need a wastegate. These diesels don't have a wastegate with the VGT.

 

[Gorilla57]

You would need a wastegate. These diesels don't have a wastegate with the VGT.

Wastegate and blow-off valves are 2 different things. A wastegate doesn’t produce any sound unless it’s a divorced gate that vents to the atmosphere, AKA damn loud exhaust sounds. You are correct, the VGT negates the need for a wastegate on the diesels.

A blow-off valve is on the intake side of the turbo. It releases boost pressure when the throttle body plate slams shut when you let off the throttle. The blow-off opens at that point, creating the big whoosh/whistle/chirp through the valve/sound device. Diesels don’t have a blow-off valve (no throttle plate closing) unless you’ve got a huge turbo and huge HP motor. Those compressor surge just due to the fact they might be pushing around 100psi of boost.

 

[imjester77]

Well then, ok! I had no idea coming from a gas turbo generation I assumed they were all the same eg. waste gates and blow off valves. Learn something new every day!

thanks for the responses!

 

[Oilburner]

I had a '99 Powerstroke that had a really nice turbo whine, just enough so you could hear it when you got on it but not so much it was annoying. You know, kinda like the 'Millennium Falcon' kicking in the hyperdrive (but slower)

 

[PillowFightr]

Wastegate and blow-off valves are 2 different things. A wastegate doesn’t produce any sound unless it’s a divorced gate that vents to the atmosphere, AKA damn loud exhaust sounds. You are correct, the VGT negates the need for a wastegate on the diesels.

A blow-off valve is on the intake side of the turbo. It releases boost pressure when the throttle body plate slams shut when you let off the throttle. The blow-off opens at that point, creating the big whoosh/whistle/chirp through the valve/sound device. Diesels don’t have a blow-off valve (no throttle plate closing) unless you’ve got a huge turbo and huge HP motor. Those compressor surge just due to the fact they might be pushing around 100psi of boost.

You just shattered 3/10 of my favorite dreams oh well thanks for the information, this forum teaches me something new everyday!

 

[IVE SPENT TOO MUCH MONEY]

I had a '99 Powerstroke that had a really nice turbo whine,

My 2008 LMM Chevy has the same, but it's just barely there, and I'm pushing ~500 HP+. Sounds nice.

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