Air gushing internally from intake plenum after turning off engine... normal?

DIGItonium · 02-20-2012, 01:43 AM

This is just a sanity check with my turbo car. When I turn off the engine, I can hear air gushing internally from the intake plenum area. It's muffled, so it doesn't sound like it's gushing outside from the gasket part.

I'm trying to see if I have a boost leak. I can't get the car to push over 7 PSI (3rd gear pull to 5k RPM at WOT) after installing the MBC and giving it a full 5 turns. I gave it the 6th full turn, but have not tested it yet.

Motordyne · 02-20-2012, 01:35 PM

Its just the vacuum in the manifold slowly equalizing to ambient pressure.

They even do that when NA.

DIGItonium · 02-20-2012, 01:45 PM

Thanks! I didn't notice it before, so I just wanted to make sure this is normal.

02-20-2012, 01:43 AM	#1 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Air gushing internally from intake plenum after turning off engine... normal? This is just a sanity check with my turbo car. When I turn off the engine, I can hear air gushing internally from the intake plenum area. It's muffled, so it doesn't sound like it's gushing outside from the gasket part. I'm trying to see if I have a boost leak. I can't get the car to push over 7 PSI (3rd gear pull to 5k RPM at WOT) after installing the MBC and giving it a full 5 turns. I gave it the 6th full turn, but have not tested it yet. __________________

02-20-2012, 01:45 PM	#3 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Thanks! I didn't notice it before, so I just wanted to make sure this is normal. __________________

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02-20-2012, 01:35 PM	#2 (permalink)
Motordyne Enthusiast Member Join Date: Nov 2008 Location: Los Angeles Posts: 384 Drives: Z Rep Power: 17	Its just the vacuum in the manifold slowly equalizing to ambient pressure. They even do that when NA.