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Old 04-23-2009, 05:26 PM   #1
The Satch
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Default Bad Idea? testing for boost leak

im not hitting target boost, missing by about 6 pounds, i have already checked all gaskets and hoses, and i dont have a smoke/fog machine. i saw an idea when i searched of using dry ice to fog the system. the idea was take a coke bottle, insert dry ice and water, and seal it with tape to the turbo inlet. this would force the fog down the charge pipes and pressurize the system allowing me to spot any leaks. any reasons i shouldnt do this?
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Old 04-23-2009, 05:42 PM   #2
jack klompus
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Have you used compressed air to see if you even have a leak? Compressed air & soapy water is usually good enough.
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Old 04-23-2009, 05:44 PM   #3
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less enthusiastic about soapy water. i have put a vacuum pump on a lot of lines and found no leaks.
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Old 04-23-2009, 05:44 PM   #4
The Satch
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less enthusiastic about soapy water. i have put a vacuum pump on a lot of lines and found no leaks.
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Old 04-23-2009, 05:51 PM   #5
jack klompus
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vacuum wont find a boost leak. at least not one pre throttle body. Soapy water is fine, plus it cleans your engine bay. Compressed air boost leak will check your intake system, turbo to intercooler, bov and IC to throttle body.
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Old 04-23-2009, 05:54 PM   #6
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makes sense. is there one line i can hook the compressor up to to check the entire system in one go?
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Old 04-23-2009, 06:09 PM   #7
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Old 04-23-2009, 06:10 PM   #8
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Search for boost leak test, theres a ton of threads on it. You have to construct a plug to plug up the intake hose, right after the air filter. All you need is a 2 or 2 1/4 or 2 1/2 (cant remember size) pvc end cap and attach a fitting on it to hook up to a air line. I just used a 1/8 npt copper fitting with a nipple on it and i connect it to my air blower / floor sweeper with a rubber vacuum line

If theres no leaks it will hold pressure solid, if theres leaks you hear hissing where its coming from.

Read up on the threads, and make sure you use a regulator and set it low, 15 psi is good enough to find leaks. You dont want to pump 90 psi into your intake system
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