SiWhite Posted January 22, 2007 Share Posted January 22, 2007 I've just wired my Racetech boost gauge into the Landy. It's been plumbed into the inlet manifold in 6mm OD pneumatic line. The thing works well, but the needle bounces like mad. On boost it jumps about over a 5 psi range, making accurate reading impossible. Plus, it rattles like mad! I imagine that the problem is probably 'resonance' (not the right term I'm sure but it feels about right ) in the pneumatic line, causing a 'bounce' in the pressure within the manifold. I'm sure this is completely normal for the engine, but it's a pain when reading the pressure. I need to be able to 'damp' the movement of the gauge, so that it reacts more slowly to changes in pressure. I was thinking about filling a centimetre or so of the end of the pneumatic line with epoxy resin and drilling a teeny tiny hole through - so the pressure still actuates the gauge but there isn't enough airflow to cause the bounce. Would this work? And is it the best solution? Is there anything available commercially that would do the same job? Quote Link to comment Share on other sites More sharing options...
Les Brock Posted January 22, 2007 Share Posted January 22, 2007 Has it not got a teenie tiny hole on the inlet to the back of the meter ?, mines a real cheepo and works ok with no other restriction ! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2007 Share Posted January 22, 2007 Stick a small inline fuel filter in the line, the extra volume acts as a damper on the signal. Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted January 22, 2007 Share Posted January 22, 2007 You can get 6mm push fit adjustable needle valves. Quote Link to comment Share on other sites More sharing options...
nas90 Posted January 22, 2007 Share Posted January 22, 2007 I've just wired my Racetech boost gauge into the Landy. It's been plumbed into the inlet manifold in 6mm OD pneumatic line.The thing works well, but the needle bounces like mad. On boost it jumps about over a 5 psi range, making accurate reading impossible. Plus, it rattles like mad! I imagine that the problem is probably 'resonance' (not the right term I'm sure but it feels about right ) in the pneumatic line, causing a 'bounce' in the pressure within the manifold. I'm sure this is completely normal for the engine, but it's a pain when reading the pressure. I need to be able to 'damp' the movement of the gauge, so that it reacts more slowly to changes in pressure. I was thinking about filling a centimetre or so of the end of the pneumatic line with epoxy resin and drilling a teeny tiny hole through - so the pressure still actuates the gauge but there isn't enough airflow to cause the bounce. Would this work? And is it the best solution? Is there anything available commercially that would do the same job? Norgren used to make a needle valve which was used as a throttle in the gas mixing panel on our old Laser #1, pretty sure you will get these from RS although quick search reveals no leads, I have D04 / D06 / D08 in stock which probably were in thou's. I don't need them anymore (different gas panel) so send me a PM and I'll post them. Alternatively use a gauge which is oil filled RS 852-154 Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted January 22, 2007 Share Posted January 22, 2007 Info here Quote Link to comment Share on other sites More sharing options...
SiWhite Posted January 22, 2007 Author Share Posted January 22, 2007 Gleaming, thanks all. Seems like flow restriction's what I need. Nas90 has very kindly offered to send me some needle valves to try. Thanks very much to him! Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted January 22, 2007 Share Posted January 22, 2007 I used washer jet pipe for mine, no issues but you could clamp the pipe to try to reduce the diameter? Quote Link to comment Share on other sites More sharing options...
white90 Posted January 23, 2007 Share Posted January 23, 2007 I just clamped the pipe till it stayed stable Quote Link to comment Share on other sites More sharing options...
nige90 Posted January 23, 2007 Share Posted January 23, 2007 I just clamped the pipe till it stayed stable Likewise. Quote Link to comment Share on other sites More sharing options...
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