scoobysmiff

iTrader: (2)

just installed a boost gauge and now i think i have problems
i'm not sure if i have just installed it incorrectly or my scoob isn't making the correct boost?

I have a uk spec MY99, it has an induction kit (yes i know!) and a full decat

i have taken the boost feed for the sensor from the spare outlet on the inlet manifold, is this correct?

when driving the car it wont go past 0.6bar but i thought it should hit at least 0.9bar,

i've not had a boost gauge before so am unsure what i should be looking for really, there seems to be lots of movement of the needle under 0bar droping as low as -0.7bar? how can this be, surely if there is a neg showing then it's sucking and not pushing am i being completely stupid please someone enlighten me,

Oh i have a leak at the turbo as well (sheared stud when fitting decat) not got round to doing it yet! would this cause issues

If i need to clean the boost solenoid where is it please

jaytc2003

iTrader: (1)

First thing first fix the leak, you know thats not right so get everything right first and then if you still have problems then go on from there. You will probably find this is causing a low boost reading as you will have low back pressure.
The negative reading is nothing to worry about, it just means the car is not being driven on boost (usually cruising conditions with constant acceleration) it is normal

scoobysmiff

iTrader: (2)

ok cheers,

that means turbo off though! not looking forward to that!

Rich_B

iTrader: (6)

Yep, this is taking the pressure of the air actually entering the engine, downstream of the throttle butterfly.

The guage shows pressure *relative to atmospheric pressure*. When the throttle is (nearly) closed, the engine is creating a partial vacuum downstream of the throttle butterfly, hence the negative pressure relative to atmospheric.

Richard.