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
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| Boost gauge buzzing http://nitrous-advice.org/viewtopic.php?f=15&t=4672 |
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| Author: | MikeT [ Tue Aug 25, 2009 8:56 pm ] |
| Post subject: | Boost gauge buzzing |
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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| Author: | MikeT [ Wed Aug 26, 2009 8:29 pm ] |
| Post subject: | Re: Boost gauge buzzing |
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
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| Author: | bobuk [ Tue Sep 01, 2009 12:36 pm ] |
| Post subject: | Re: Boost gauge buzzing |
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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| Author: | mrmoo [ Tue Sep 01, 2009 3:20 pm ] |
| Post subject: | Re: Boost gauge buzzing |
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  using things for purposes for which they arnt designed should always be applauded 
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| Author: | MikeT [ Tue Sep 01, 2009 4:37 pm ] |
| Post subject: | Re: Boost gauge buzzing |
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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| Author: | mrmoo [ Tue Sep 01, 2009 4:44 pm ] |
| Post subject: | Re: Boost gauge buzzing |
you should really have the boost gauge connected to the manifold plenium 
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| Author: | MikeT [ Tue Sep 01, 2009 5:07 pm ] |
| Post subject: | Re: Boost gauge buzzing |
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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| Author: | mrmoo [ Tue Sep 01, 2009 5:30 pm ] |
| Post subject: | Re: Boost gauge buzzing |
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??  
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| Author: | MikeT [ Wed Sep 02, 2009 8:22 am ] |
| Post subject: | Re: Boost gauge buzzing |
As it's an IDI diesel there's no fuel regulator, just one big clever bosch mechanical fuel injection pump. |
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| Author: | IDP [ Wed Sep 02, 2009 3:17 pm ] |
| Post subject: | Re: Boost gauge buzzing |
And also no throttle to be closed |
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| Author: | mrmoo [ Wed Sep 02, 2009 8:00 pm ] |
| Post subject: | Re: Boost gauge buzzing |
dammit how am i supposed to know what everyone drives! my bad bloody oil burners 
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| Author: | IDP [ Wed Sep 02, 2009 8:28 pm ] |
| Post subject: | Re: Boost gauge buzzing |
LOL
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| Author: | fraguzz [ Mon Apr 12, 2010 6:41 pm ] |
| Post subject: | Re: Boost gauge buzzing |
i had that problem once.. bought a geddy that has a electronic map sensor so no tube inside the cabin. |
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