biggles Posted February 20, 2013 Share Posted February 20, 2013 Right after doing a bit of a search, and not really finding what i was after, here goes. At the risk of seeming thick will a turbo boost gauge that reads in -in hg (vacum) and + psi work on a td5? only ask as 1 i dont know and 2, ive asked a couple of people and been given both yes and no answers ie it will read pressure but not vacum Ta Quote Link to comment Share on other sites More sharing options...
Josh NZ Posted February 20, 2013 Share Posted February 20, 2013 It should read boost and vacuum if you plumb in the 'tee' fitting in the right place. If you don't it will either read only vacuum or less than full boost and mislead you. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted February 20, 2013 Share Posted February 20, 2013 Does the TD5 have a throttle flap? Typically diesels do not, and thus never run with a vacuum, though some EGR systems use a throttle flap to create a vacuum in the inlet manifold to draw exhaust gasses in. Quote Link to comment Share on other sites More sharing options...
biggles Posted February 20, 2013 Author Share Posted February 20, 2013 Does the TD5 have a throttle flap? Typically diesels do not, and thus never run with a vacuum, though some EGR systems use a throttle flap to create a vacuum in the inlet manifold to draw exhaust gasses in. Not 100% but no idon't think so Quote Link to comment Share on other sites More sharing options...
RedLineMike Posted February 20, 2013 Share Posted February 20, 2013 td5's dont have a throttle butterfly, i have a boost guage on mine & its plumbed in beside the take off to the turbo wastegate Quote Link to comment Share on other sites More sharing options...
biggles Posted February 20, 2013 Author Share Posted February 20, 2013 So one that only reads pressure then, thanks for replys. Quote Link to comment Share on other sites More sharing options...
TheRecklessEngineer Posted February 20, 2013 Share Posted February 20, 2013 I used a standard industrial pressure gauge rated from 0 - 2 bar. It's about 1/4 the price of an automotive unit (aside from the dodgy chinese things on eBay) Quote Link to comment Share on other sites More sharing options...
Aragorn Posted February 20, 2013 Share Posted February 20, 2013 One that reads vacuum will still work fine, it will just never drop below 0. Quote Link to comment Share on other sites More sharing options...
biggles Posted February 21, 2013 Author Share Posted February 21, 2013 One that reads vacuum will still work fine, it will just never drop below 0. Thanks, Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted February 21, 2013 Share Posted February 21, 2013 One that reads vacuum will still work fine, it will just never drop below 0. If the gauge pipe connection is after the turbo, say in the inlet manifold, it will read as described, just showing positive pressure. If the gauge pipe connection is before the turbo a negative pressure reading will show a restrictive air intake, which could be blocked filter, collapsing pipework, restrictive snorkel assembly (if fitted). If you only buy one gauge you might like to create two connection points, before and after the turbo, blanking off the unused one. This means you can 'prove' the unpressurised intake system whenever you feel the need. Note that you need to drive the vehicle to generate maximum boost to collect this proof, but once done you can revert to measuring boost pressure 'all the time', until the next change to the intake system. 1 psi = 2.036021 Inches of Mercury. 1 Inch of Mercury = 0.4911541 PSI. HTH. Quote Link to comment Share on other sites More sharing options...
biggles Posted February 21, 2013 Author Share Posted February 21, 2013 If the gauge pipe connection is after the turbo, say in the inlet manifold, it will read as described, just showing positive pressure. If the gauge pipe connection is before the turbo a negative pressure reading will show a restrictive air intake, which could be blocked filter, collapsing pipework, restrictive snorkel assembly (if fitted). If you only buy one gauge you might like to create two connection points, before and after the turbo, blanking off the unused one. This means you can 'prove' the unpressurised intake system whenever you feel the need. Note that you need to drive the vehicle to generate maximum boost to collect this proof, but once done you can revert to measuring boost pressure 'all the time', until the next change to the intake system. 1 psi = 2.036021 Inches of Mercury. 1 Inch of Mercury = 0.4911541 PSI. HTH. Now that is a good idea, thanks very much for input Quote Link to comment Share on other sites More sharing options...
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