</font><blockquote><font class="small">Quoting DDM:</font><hr />
You should know from my post that’s right above your post. And if you boost test your car with a valve stem that’s all on you. I block everything off and use a smoke/air machine like it should be done but to each its own.
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Not all boost leaks can be detected with a smoke air machine. What may not leak at 10psi, may leak at 21psi.
One of these..
pressurized to your maximum boost pressure and a spray bottle filled with soapy water is much more effective. Its not a valve stem, but the same concept.
I dealt with a nasty throttle shaft seal leak that was undetectable under 5psi. By 12psi, it was hissing like crazy. On a high performance turbocharged car, a smoke air machine is not sufficient.