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Originally Posted by Scotts335i
SO how do you know if you have a boost leak if you have no information about what you are boosting? How do you know if your boost selinoid or waist gate are not stuck open? With out the gauge, you do not know. Anyone that is looking to add more power needs one.
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+1. I'd imagine that the 335i is a first turbo'd car for a lot of people here so they don't know much about the turbo yet. You would be suprised how a minor boost leak affects performance.
The easiest way to determine a boost leak is to look at a boost gauge to see if there is any abnormal drop, and if there is...time to run a boost leak test and find the culprit(s).
All the people who said that German engineering makes it OK not to have a boost gauge are wrong, it doesn't matter how well the car is made...a turbo'd car has a lot of pressure running through the wastegate, turbo tubes, bov, intercooler pipings, etc. and if there is a loose connection that allows air to prematurely get out, performance will suffer.