vaccum pressure at idle??

[andyg plym]

remember reading it somewhere, but cant find it

what should the boost gauge say when your car is at idle?

mine is about -5 to -6 bar, is this about right? I remember reading that it can be one of the symptoms of a boost leak somewhere.

[ranz]

It all depends on engine condition also, but the -0,6BAR seems to be normal.
But, it´s always good to chek the intake leaks (pressure test), the cars are old and it has lots of places where to leak

[terrybullwon]

Andy do you mean inHg? Vacumme is normally messured in inches of mercury. -5 to -6 Bar would be alot, most gauges I have seen if not messured in Hg go to about -1 bar

[Audi-Porsche Avant RS2]

Sorry, but with vacuum pressure can I test the status of the engine like pistons segment and valve stem seals?
Thanks a lot!
Bye

P.S. Terry I wait a answer, thanks a lot!
Bye

Alessio

[andyg plym]

Andy do you mean inHg? Vacumme is normally messured in inches of mercury. -5 to -6 Bar would be alot, most gauges I have seen if not messured in Hg go to about -1 bar

hg? huh??? the boost gauge just shows -5 to -6 bar. on the other end of the scale when in 6th at wot i hit 1.9 bar but it is a bit hesitant. going to do the usyal checks ie pos,coilpacks etc mine was mapped by minhea at mrc

[terrybullwon]

Ok well I am pretty sure your not seeing minus 6Bars of vacuum

[andyg plym]

ok perhaps i mean -0.5 to -0.6 then

[terrybullwon]

That's around 177inch hg, what your seeing is about right