bouncing boost gauge
Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
Do you have a Dual relief valve, or a BRV+ (dieselsite) relief valve that has the boost gauge port fitting in it? I noticed that when my DRV activated, it would make the needle jump around, and it wasn't compressor surge.
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More Turbo
Joined: May 2005
Posts: 704
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From: Thousand Oaks, CA
yah i have the BRV+ and the gauge is taped into it. by the way today i finished the turbine install. took me so long because i couldnt find a deep 12pt 5/16'' socket or a 1/4''npt in this town to save my life. i will post some pics soon. but thanks for the help strokinit.
Post Fiend
Joined: Jun 2006
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From: Central, Al
With the BRV+ if you are tapped into the intake side you should see a constatnt pressure the Turbo is producing unless you are getting surge. If you tapped into the MAP side you will see the boost the MAP is seeing and it could bounce if is is "Blowing Off"
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More Turbo
Joined: May 2005
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From: Thousand Oaks, CA
Originally Posted by amiller93
With the BRV+ if you are tapped into the intake side you should see a constatnt pressure the Turbo is producing unless you are getting surge. If you tapped into the MAP side you will see the boost the MAP is seeing and it could bounce if is is "Blowing Off"
Post Fiend
Joined: Jul 2005
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From: 21791
No the problem is that the boost relief is right beside the boost gauge. There is not much volume at all in that small hose. When it cracks open, alot of the pressure inside that hose goes out of the valve, and until the engine can push the air back in that small hole, it will make the needle fall. It will then go back up, where it cracks again and it dumps gauge pressure again. The way to fix it is move the valve farther away where it has less of an influence on the boost gauge. Or, make the boost gauge tube longer, but again less responsive. Or do it the right way and get a Overboost regulator.
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More Turbo
Joined: May 2005
Posts: 704
Likes: 2
From: Thousand Oaks, CA
Originally Posted by strokin_it7.3
No the problem is that the boost relief is right beside the boost gauge. There is not much volume at all in that small hose. When it cracks open, alot of the pressure inside that hose goes out of the valve, and until the engine can push the air back in that small hole, it will make the needle fall. It will then go back up, where it cracks again and it dumps gauge pressure again. The way to fix it is move the valve farther away where it has less of an influence on the boost gauge. Or, make the boost gauge tube longer, but again less responsive. Or do it the right way and get a Overboost regulator.
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Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Originally Posted by amiller93
Kris on the BRV+ you can "Blow" the relief and the intake side tap will not lose pressure.
Te big question is can you hear it surging along with seeing it on the gauge. A turbo pushing on the stall line makes a very distinct (amd annoying) noise. If you are hearing surge you may need the housing, but if it's just the needle bouncing it's probably a pressure drop at the valve.
Lead Driver
Joined: Jan 2006
Posts: 7,308
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From: Hartford, WI
Originally Posted by amiller93
With the BRV+ if you are tapped into the intake side you should see a constatnt pressure the Turbo is producing unless you are getting surge. If you tapped into the MAP side you will see the boost the MAP is seeing and it could bounce if is is "Blowing Off"
Lead Driver
Joined: Jan 2006
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From: Hartford, WI
Originally Posted by amiller93
The BVR+ has two taps in it one on intake side pre relief and one on MAP side
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More Turbo
Joined: May 2005
Posts: 704
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From: Thousand Oaks, CA
Originally Posted by amiller93
The BVR+ has two taps in it one on intake side pre relief and one on MAP side
