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Old 07-07-2014, 11:18 PM   #1 (permalink)
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boost gauge?

hey all,
i got a boost gauge for free….i was wondering if i could use it as a vacuum gauge?

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Old 07-08-2014, 12:00 AM   #2 (permalink)
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That depends, does it also measure vacuum?
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Old 07-08-2014, 12:47 AM   #3 (permalink)
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I was under the impression a boost gauge was just a vacuum gauge.
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Old 07-08-2014, 01:39 AM   #4 (permalink)
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Quote:
Originally Posted by mbolton1990 View Post
I was under the impression a boost gauge was just a vacuum gauge.
boost vs vacuum is opposite in my mind. One measures suck one measures blow. Positive vs negative pressure.
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Old 07-08-2014, 02:48 AM   #5 (permalink)
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My boost gauge has both on the same dial. The left 1/3 of the face is vacuum the right 2/3rds is boost. It will function as one or the other but not both at the same time.

It is a Equus brand
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Old 07-08-2014, 07:20 AM   #6 (permalink)
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its just a boost gauge not both, but a boost gauge hooks up to the waste gate? on the turbo? mine will be hooked up to an engine vacuum source i wonder if the gauge will read with opposite pressure? or will it be the same
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Old 07-08-2014, 09:09 AM   #7 (permalink)
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It won't work, since it is not capable of reading vacuum which is lower than atmospheric pressure, versus postive pressure which is boost.

regards
Mech
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Old 07-08-2014, 09:23 AM   #8 (permalink)
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The boost gauge reads the turbo's positive psi pressure which moves the needle right.
A vacuum source on it would move the needle left / negative pressure.

Sounds like yours was not marked to go backwards - but it might , you never know until you try , despite being no scale to measure it with you could watch for peak vacuum or what ever. try it on a vacuum source or draw a breath threw it and see if the needle moves backwards.
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Old 07-08-2014, 09:49 AM   #9 (permalink)
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Old 07-08-2014, 11:50 AM   #10 (permalink)
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I have a boost gauge (unsure of brand) on a Volvo 940 Turbo and you can definitely use it as a vacuum gauge.I stay out of boost 90% of the time I drive it and use it as a vacuum gauge,and it does a great job!The needle can show you negative pressure(vacuum) as well as positive (boost).

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