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Author Topic: Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake  (Read 2899 times)

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Offline dfemia01

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Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake
« on: July 06, 2015, 09:50:20 AM »
I'm impressed with the performance after these first 2 mods but I'm hearing a new noise that sounds like it's coming from the blowoff valve - like a "coughing" sound (for want of a better description - "belch" works too).  It's most noticeable if I've been accelerating hard, depress the clutch pedal and ... "loud cough" sound.  Its sometimes there as well if I've not been pushing it quite so hard.  I had the cold air intake installed with the LNF Turbo upgrade (so i'm reasonably sure it's not from any monkeying that i've done) ...

Thoughts?
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Offline Jim

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Re: Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake
« Reply #1 on: July 06, 2015, 11:10:02 AM »
It's the blow off valve. The stock airbox helped to muffle the noise and the new intake doesn't muffle it so anytime you build some boost and shift gears or let off the throttle, you'll hear it.
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Offline dfemia01

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Re: Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake
« Reply #2 on: July 06, 2015, 11:35:34 AM »
Jim,

I suspected as much thanks for the quick response.  I did some poking around here (and some other places) but didn't see anything specific to the sound.  Now to plan out some other upgrades .....
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Offline Jim

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Re: Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake
« Reply #3 on: July 06, 2015, 12:08:53 PM »
Some say it sounds like a goose when letting off the throttle or shifting gears.
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Offline Gentleman Jack

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Re: Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake
« Reply #4 on: July 06, 2015, 07:43:11 PM »
Turkey gobble?
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Offline elff

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Re: Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake
« Reply #5 on: July 07, 2015, 03:32:17 AM »
Quote from: Gentleman Jack on July 06, 2015, 07:43:11 PM
Turkey gobble?

That's what mine sounded like.  I used to call it the turkey turbo.
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Offline dfemia01

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Re: Strange noise after GMPP LNF Turbo Upgrade Kit/Tune and GMPP Cold Air Intake
« Reply #6 on: July 07, 2015, 11:11:00 AM »
Choking the ... never mind.  Yep that's the sound ...
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