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My boost reads about -600mmHg at idle. I think this is too low because about a week ago it was about -400mmHg and when I dynoed a few days ago I was only making about .8 kg/cm2 and not even holding boost at that. Is vaccum pressure a good way to indicate a boost leak?

Chris
 
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Yeah you probably have a boost leak somewhere. I know a lot of guys on here use www.hosetechniques.com and after they replace all their vaccume lines they pick up more boost. Im not sure your how old your car is, but over time the lines can get hairline cracks, and blow off a little bit. Make sure everything is tight and if you want, replace them.

Also check the intake plumbing hose clamps make sure they are tight, and your ic clamps under your car.

You can check for vacume leaks by pressurizing your intake. Im not sure exactly how its done but im sure someone will be happy to explain in detail how to do it.
 
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mine is at about -20 somthing...dont know the unit. mine measures in PSI.
 
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Zerosoul said:
mine is at about -20 somthing...dont know the unit. mine measures in PSI.
That's probably inches of mercury. -17 to -20 in Hg is probably normal...
Reading intake vacuum can be useful diagnostic:
 
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