To get an accurate reading you need to fit a pressure gauge up stream of the turbo and do a specific run test, but as a rule of thumb test hold the induction hose after the turbo squeeze it a little and run the engine, give it a rev and it should swell up as pressure builds, not the most accurate test but this will tell you if the turbo is creating any boost pressure at all.
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Tuesday, October 27th, 2015 AT 1:29 PM