 | Home > Tdi > Bouncing Boost Gauge Needle |
 
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| SiWhite Member Since: 19 Jan 2010 Location: North Hampshire Posts: 455   
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I had the same problem with my old TDi.
The pressure inside the manifold fluctuates at a very fast rate and produces a wobbly needle that makes accurate reading impossible. There is a little device that can be connected in line with the pressure hose - sadly I can't recall what it is called! It allows boost pressure to reach the guage, but it stabilises the pressure so the needle is slower to react to changes. My blog - www.anacreinhampshire.blogspot.co.uk 110 TD5 BuildHERE - sold! 110 Tdci Build HERE - sold! Passat Alltrack - 4x4, auto, 45mpg, gloriously comfortable - but not a Defender! |
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7th Oct 2015 11:12am |
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| SiWhite Member Since: 19 Jan 2010 Location: North Hampshire Posts: 455
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Edit - I knew there was a thread somewhere...
http://forums.lr4x4.com/index.php?showtopic=11183 Looks like you need a needle valve for a neat job My blog - www.anacreinhampshire.blogspot.co.uk 110 TD5 BuildHERE - sold! 110 Tdci Build HERE - sold! Passat Alltrack - 4x4, auto, 45mpg, gloriously comfortable - but not a Defender! Last edited by SiWhite on 7th Oct 2015 11:21am. Edited 1 time in total |
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7th Oct 2015 11:14am |
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| schweps Member Since: 21 Oct 2014 Location: Zonguldak Posts: 47  
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Thanks for your prompt response,
I got the idea. What about (-) reading? |
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7th Oct 2015 11:20am |
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| SiWhite Member Since: 19 Jan 2010 Location: North Hampshire Posts: 455
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There shouldn't be a vacuum detected in the inlet manifold. My blog - www.anacreinhampshire.blogspot.co.uk
110 TD5 BuildHERE - sold! 110 Tdci Build HERE - sold! Passat Alltrack - 4x4, auto, 45mpg, gloriously comfortable - but not a Defender! |
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7th Oct 2015 11:21am |
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| schweps Member Since: 21 Oct 2014 Location: Zonguldak Posts: 47
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Ok. Thanks.
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8th Oct 2015 6:10am |
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| TiredGeek Member Since: 30 Jul 2014 Location: Yorkshire Posts: 7 |
When I fitted a boost gauge I had exactly the same problem, wobbly needle.
I got the little tube off a WD40 can and put that inside the pipe to the gauge and then tied it really tight with a tie wrap to make sure the air had to go through the little tube. The result was a dead steady needle  The doctors said it's OK to listen to the voices, just not to do what they tell me!Last edited by TiredGeek on 11th Dec 2015 9:01pm. Edited 1 time in total |
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9th Dec 2015 10:13pm |
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| schweps Member Since: 21 Oct 2014 Location: Zonguldak Posts: 47
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Hi,
I used a pneumatic flow control valve as adviced. |
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11th Dec 2015 8:41pm |
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