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 Post subject: Boost gauge buzzing
PostPosted: Tue Aug 25, 2009 8:56 pm 
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Joined: Wed Aug 29, 2007 1:23 pm
Posts: 1117
Location: South Coast, UK
I'm still having difficulty with a buzzing boost gauge, particularly at idle/off-boost.

I've been told a damper/restriction should sort the buzzing so I tried that and it did sort of work slightly but not enough - anyone know how small a bore I need? The gauge inlet is tiny already.

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Citroen Xantia 1.9TD


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 Post subject: Re: Boost gauge buzzing
PostPosted: Wed Aug 26, 2009 8:29 pm 
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Wizard

Joined: Wed Aug 29, 2007 1:23 pm
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Location: South Coast, UK
Update, removed both MBC and gauge, brought them indoors and fed them a battery powered air pump. Result? They both behaved admirably. Must be user error :beatstick:

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 Post subject: Re: Boost gauge buzzing
PostPosted: Tue Sep 01, 2009 12:36 pm 
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Joined: Wed May 10, 2006 11:47 pm
Posts: 42
Location: pontefract
mike, a small restrictor orifice works if you get the right size for the type/size gauge and pipework, go too small and you get lag that masks initial boost spikes,
before boost gauges were readily available we used 30psi bourdon gauges from a local refrigeration firm, if you just plummed them in they buzzed and the needle looked blurred,
i found using a fuel filter from a vauxhall cav sri inline with the gauge did the trick of damping the needle vibration without hurting the response of the gauges, still use one to this day on my old mityvac, not pretty but it works for me and it helps keep crud out of the gauge,

you could try moving your restrictor close to where its tapped into the intake to maximise volume after the restrictor.

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 Post subject: Re: Boost gauge buzzing
PostPosted: Tue Sep 01, 2009 3:20 pm 
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Wizard
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Joined: Sat Jul 28, 2007 11:42 pm
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Location: South Staffordshire
i thought the Ts that come with the gauges usually have a restrictor built in?
the greddy, blitz and hks boost gauges ive used all have them in the T

i like the unorthodox filter mod bob :yes: using things for purposes for which they arnt designed should always be applauded :D

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 Post subject: Re: Boost gauge buzzing
PostPosted: Tue Sep 01, 2009 4:37 pm 
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Wizard

Joined: Wed Aug 29, 2007 1:23 pm
Posts: 1117
Location: South Coast, UK
I'm so cheap I didn't get any hose or T's.
I've relocated the take-off to a post-IC hose instead of taking off the turbo compressor but it's made little difference. Next test is a small connector which I've filled with chemical putty and, when I get some micro drills, will experiment with different bore sizes.

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 Post subject: Re: Boost gauge buzzing
PostPosted: Tue Sep 01, 2009 4:44 pm 
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you should really have the boost gauge connected to the manifold plenium :lol:

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 Post subject: Re: Boost gauge buzzing
PostPosted: Tue Sep 01, 2009 5:07 pm 
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Location: South Coast, UK
AFAIK, there's two schools of thought on this - those that want to know the turbo isn't exceeding it's specs and those that want to know how much boost is getting to the manifold. I originally went for the safe option but it's now getting the same signal the fuel pump is getting - which is just prior to the manifold.

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 Post subject: Re: Boost gauge buzzing
PostPosted: Tue Sep 01, 2009 5:30 pm 
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Wizard
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Location: South Staffordshire
but wont that mean the fuel pressure regulator isnt actually setting the fuel correctly?
its giving a rich mixture as it will always see turbo boost, even when the the throttle is closed?
but as i seem to be saying lots lately, what do i know?? :omgrofl: ;)

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 Post subject: Re: Boost gauge buzzing
PostPosted: Wed Sep 02, 2009 8:22 am 
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Location: South Coast, UK
As it's an IDI diesel there's no fuel regulator, just one big clever bosch mechanical fuel injection pump.

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 Post subject: Re: Boost gauge buzzing
PostPosted: Wed Sep 02, 2009 3:17 pm 
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Joined: Sat Aug 16, 2008 7:58 pm
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And also no throttle to be closed


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 Post subject: Re: Boost gauge buzzing
PostPosted: Wed Sep 02, 2009 8:00 pm 
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dammit how am i supposed to know what everyone drives! :omgrofl:
my bad :D bloody oil burners :P

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 Post subject: Re: Boost gauge buzzing
PostPosted: Wed Sep 02, 2009 8:28 pm 
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Joined: Sat Aug 16, 2008 7:58 pm
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LOL :lol:


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 Post subject: Re: Boost gauge buzzing
PostPosted: Mon Apr 12, 2010 6:41 pm 
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Joined: Mon Apr 12, 2010 5:42 pm
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Location: denmark kĂžbenhavn
i had that problem once.. bought a geddy that has a electronic map sensor so no tube inside the cabin.


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