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boost gauge in.hg


biggles
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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

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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.

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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

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