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20 March 2009, 10:32 PM

Scoobyn

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Boost reading

Can anyone tell me why the boost gauge reads i minus figure when off boost?? I thought it would just read 0???

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20 March 2009, 10:34 PM

Sideways Ste

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they just do lol
You'll always get a negative boost before the turbo spools up...

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20 March 2009, 10:47 PM

mike h

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When you're off boost the engine is sucking air (minus reading as it's a vacuum), when you're on boost air is being forced in so a positive reading is given.

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21 March 2009, 12:21 AM

Scoobyn

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Ah,that makes sense now. Thanks for that.

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21 March 2009, 12:28 AM

mike h

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No prob.

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21 March 2009, 12:41 AM

joz8968

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mike's summed it up perfectly and simply.

The OP might be interested to know that you can buy boost gauges that are calibrated from 0bar/psi, so only register from that point on i.e. only positve boost shown - when turbo's blowing...