How to Boost Leak Test Your Turbocharger & Charge Air System
Our technical service team recommends performing a boost pressure leak down test after any turbocharger installation or service. This test involves pressurizing the intake air system to find air leaks that may be present between the turbocharger outlet and the engine inlet. Performing a boost pressure leak down test allows you to verify the integrity of the installation and ensure your installation operates trouble-free, avoiding the potential for reduced power, poor fuel economy, increased exhaust gas temperatures (EGTs), and turbo lag.
Grab a boost leak tester and a bottle of soapy water and follow along:
Grab a boost leak tester and a bottle of soapy water and follow along:
- Prep the Vehicle: Ensure the engine is completely off and cool. Remove the air filter and intake tube so the turbo compressor inlet is exposed.
- Install the Tester: Secure the boost leak tester onto the turbo inlet using a heavy-duty silicone coupler and T-bolt clamps from our plumbing and hardware collection. Make sure you have the proper turbo installation kits and hardware ready before starting any assembly work.
- Plug Other Openings: If your system has any crankcase vent lines or PCV ports tied into the pre-turbo intake tract, make sure to plug them so air doesn't escape out of them.
- Pressurize the System: Attach your air compressor's chuck to the tester's valve stem and slowly pressurize the system. Never exceed 20 to 25 PSI (or your vehicle's factory max boost level, especially when running upgraded components and turbo accessories like our Cheetah Turbos) to avoid blowing seals or hoses off.
- Listen for Leaks: With the system pressurized to about 15–20 PSI, listen for any obvious leaks or hissing sounds.
- Spray Soapy Water: Spray a mix of soap and water on all the intercooler boots, clamps, gaskets, and plastic charge pipes. Watch for growing bubbles to pinpoint tiny leaks.
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