vaccum on boost gauge

rsmith

Robbie
Apr 28, 2004
2,797
1
Tipperary, Ireland
This is my reading


IMG00031-20100123-1757.jpg
 

BoomhaueR

Wanna go fasterrrR
Oct 9, 2008
810
0
Exeter, Devon
Your gauge measures BAR. Yours says nearly -0.8BAR. Convert this and you get -0.8 bar = -23.623 986 456 923 49 inch of mercury [0 °C]. Therefore you do not have a boost leak. :)

So to clarify if you are running around -20inHg OR -0.8BAR then you have a leak free system!
 

bainsycupra

Guest
vaccum

sorry just had a look and its sitting on -7 bar does that seem low.
 

bainsycupra

Guest
vaccum

any one know if -7 is low.do i need to get pressure tested.
 

Faisal

UK's 1st Liquid Yello LCR
May 27, 2008
1,445
0
Most likely at work
im at -20psi on idle.

iv always suspected a boost leak since it only holds at 12/14/16psi in 2nd/3rd/4th gear respectively (on a stage 2 cupra r from 5k revs onwards) i dont know if thats normal or leakage...
 

ThackersLCR

Active Member
Jul 5, 2008
141
0
Blackpool
Sorry to bring an old thread up (getting good at this). My in-hg, varies on idle. From cold it sits at -16, little tap of the peddle and drops to -20, then pull away and itl drop to -25 at the end of the road. Then back up to -20. It does this when hot or cold. Id of thought it would of stayed at the same number when up to temp? Can anyone comment?
Cheers
 
Jun 16, 2008
516
0
good thread.

mines just about sits on -1 psi - or usually just 0 on idle

this is 100% boost leak right??
 
Jun 16, 2008
516
0
sometimes turbo engines just do my nut in lol.

i think its time for one of these smoke tests
 

ThackersLCR

Active Member
Jul 5, 2008
141
0
Blackpool
good thread.

mines just about sits on -1 psi - or usually just 0 on idle

this is 100% boost leak right??

I would say boost leak is most likely! Have a good look under the bonet mate, most things can be spotted, build up of dirt on pipes, splits, worn areas, loose clips.

Could it be possible that my varying issue is coil pack related? Just had them out and inspected. The one i havent replaced (replaced before i got car) smells abit suspect and has a brown stain on the inside.
 

DJ-LIAMC

VAGisclean
May 31, 2009
656
0
Loughborough
Just been out for a drive and noticed i lost boost only boosting at 13psi holding with no peak? used to be 22psi peak holding 18/19psi? also noticed vacuum on idle is now -26 and used to be -20. could this be a boost leak or hardware failure ie. MAF, N75?
 

Faisal

UK's 1st Liquid Yello LCR
May 27, 2008
1,445
0
Most likely at work
Just been out for a drive and noticed i lost boost only boosting at 13psi holding with no peak? used to be 22psi peak holding 18/19psi? also noticed vacuum on idle is now -26 and used to be -20. could this be a boost leak or hardware failure ie. MAF, N75?

im on the same boat, last night my car stopped boosting at 22psi and its only reaching 16psi. we fiddled about with my n75 and now im boosting at 4psi lol. think i need a new one...
 

Faisal

UK's 1st Liquid Yello LCR
May 27, 2008
1,445
0
Most likely at work
i did what lee just said. adjusted the screw - which made it worse lol. turned it clockwise one half turn, boosted at 8psi, turned it back, now its boosting at 4psi. turned it back round the other way, still 4 psi. im truely buggered now :(
 

DJ-LIAMC

VAGisclean
May 31, 2009
656
0
Loughborough
Oh k i better leave mine then. had a look for a leak but couldnt find one next is to take it for a drive with the maf disconnected then the n75 see if its any of them
 
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