Taff107

Chaps pls excuse my lack of mechanical knowledge but is this how the boost guage is supposed to work?
When I turn the ignition on, it rests at zero




however, on starting, it goes to about revving it or driving shows this.....

Is it supposed to drop back to 20 and rise to about 0 ?????
It is connected as below.....





Any advice is appreciated

Gambit

iTrader: (6)

Yes it's normal, it'll be under vacuum at idle and -20 in/hg is normal also

Don Clark

When "off boost" you car is naturally aspirated so the inlet will be under vacuum conditions and the vacuum will rise /fall depending upon revs.
Only when the turbo comes on boost will it rise above 0.

Taff107

Ahh ok - ty.
Even with hard acceleration, it doesn't rise much above 0 though.....

iain710

alcazar

iTrader: (2)

On tickover, it reads BELOW zero.
Only when driving hard will you see it moving.