Boost Gauge.... confused?

[GirlRacer]

Hi all, ive searched the forums for info. Found input & read it.
So then began to search for Autometer Boost Gauge 5703 in "bar"
To match the other dials. But on one forum thread i read " its Bar "
but the 5701 is psi ?
But im confused about the vaccum, what is it......
i know its a dyson, thats before anyone says it

Have seen some VDO ones with turbo written on it.
and if i have to get a chrome surround, have found black surrounds for £4.99.

I dont want to pay a fortune for one, as im also needing a radar/laser detector.
(looking at a bonny boost gauge, i might not notice the hairdryer man in his van)

Cheers
Tina.

[Corey]

It is best to get a vac/boost gauge as the "vac" part shows vaccuum when the throttle is closed and gives a good indication of engine condition.

[S2 Ant]

And for laser detection / gps i'd recommend a Road Angel.

[A80Avant]

hey corey,now that you mentioned it,what could be indicative of engine problem when vaccum is less or more than normal?what should one check out for?
cheers
Vasilis

[Greg_S]

But im confused about the vaccum, what is it......

Cheers
Tina.

Tina,

When you are not on boost and at idle the engine acts very much like a normally aspirated engine. The effect of the pistons moving in the engine and they way the engine works it sucks the air into the cylinders which is why you get a vacuum.

On my car on idle is it typically 0.58-0.6bar vacuum at idle.