What is normal boost pressure?

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Mar 10, 2014 | 08:15 AM

#16

JOHN2001

Logistics Pro

Joined: Dec 2010

Posts: 4,738

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From: Temperance, MI

Here's my .02 cents. The noise is nothing more then the waste gate doing it's job.

Mar 10, 2014 | 08:59 AM

#17

Dan V

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Joined: Jun 2013

Posts: 5,647

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From: north of Minneapolis, MN

As I understand how the wastegate works, you can't hear it in operation. It relieves drive pressure from the turbine side to the exhaust pipe downstream of the ex turbine. It doesn't function as an overboost blow off valve.

Mar 10, 2014 | 09:58 AM

#18

A/Ox4

9 ECHO 1

Joined: Aug 2009

Posts: 12,467

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From: Missouri

Quote:

Originally Posted by Dan V

Correct, the sound heard is a reverse of air flow out the intake as pressures seek homeostasis.

Mar 10, 2014 | 11:05 AM

#19

River19

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Joined: Jul 2009

Posts: 768

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From: Live VT, Work MA

Quote:

Originally Posted by A/Ox4

Correct, the sound heard is a reverse of air flow out the intake as pressures seek homeostasis.

So what you're saying is.....the truck burps.....

Mar 10, 2014 | 12:01 PM

#20

Pikachu

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Joined: Jun 2004

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From: Amarillo, TEXAS!

Quote:

Originally Posted by River19

So what you're saying is.....the truck burps.....

Essentially, yes.

Mar 10, 2014 | 01:00 PM

#21

River19

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Joined: Jul 2009

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From: Live VT, Work MA

Quote:

Originally Posted by Pikachu

Essentially, yes.

i like things simple, so what Dan said is the Wastegate basically causes the truck to fart the excess.....while the sound heard is the burp from the intake.....most likely....

Mar 10, 2014 | 01:14 PM

#22

Dan V

Lead Driver

Joined: Jun 2013

Posts: 5,647

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From: north of Minneapolis, MN

No, what is happening is the wastegate sensor is seeing an overboost condition, it tries to resolve the overboost by relieving drive pressure on the exhaust side of the turbo. Previous to the wastegate opening and reducing drive pressure, the intake side, (for all practical purposes, all the CAC tubing, the CAC cooler, right up to the intake valves) is seeing, say 30psi of pressure.

When the wastegate opens, the drive pressure falls, reducing the speed of the turbo shaft, which produces less pressure in the compressed side of the air intake. Say the tubing has 30psi in it, the wastegate opens, turbo slows and perhaps is producing 10psi....20 psi burps back through the compressor wheel and back into the air filter.

Acid reflux.....