Drivetrain (Cooper S) MINI Cooper S (R56) intakes, exhausts, pulleys, headers, throttle bodies, and any other modifications to the Cooper S drivetrain.

Boost leak test?

Old 08-08-2015, 09:02 PM
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Boost leak test?

Anyone know how to properly perform a boost leak test on our cars?
Old 08-21-2015, 12:16 PM
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I second this question.
Old 08-21-2015, 04:08 PM's Avatar is online now
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See if this thread on NAM here my be helpful.
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Old 08-22-2015, 09:07 PM
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the best thing to do is a smoke test as you can find all the leaks with that. But you will need someone with a smoke machine to do it for you.

Old 09-11-2015, 07:08 AM
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Two ways
I made an adapter out of PCV with a tire valve stem that I put in the hot side boost tube and can apply air pressure up to 25 psi. This addresses the intake BEFORE the throttle body.
For the intake manifold itself; this is more touchy but a smoke machine from the exhaust tips will work or plug the tips and access through the O2 sensor port.
Using the pre throttle method; plug the tips and have someone in the car ignition on open the throttle body then introduce the pressurized air.
One then has to listen for air leaks
I also made a smoke producing apparatus using some pipe, end caps and 2 small holes on either end and use tobacco to introduce the smoke then apply the air but generally one can track down via the noise using vacuum tube as a stethoscope.

Last edited by Indimanic; 09-11-2015 at 07:14 AM.
Old 10-05-2015, 03:05 PM
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We have both the high-pressure adapter and the lower pressure smoke test. The smoke test is easier to use, especially with small leaks that don't smoke up the whole engine bay.
Old 10-19-2015, 02:20 PM
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Found these drain plug adapters that fit into the exhaust and seal perfectly.
Remove the hot side boost tube, put in adapter, turn on ignition to open throttle body then pressurize the system with air. Add smoke if a leaking noise is detected.
This pressurized the entire intake and exhaust systems
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