The best tool you can have in your arsenal to find a boost leak on your bmw is a proper smoke / leak tester. Overheating turbo from prolonged overworking Learn how smoke testing is used to detect boost leaks, ensuring optimal turbo performance and efficient airflow.
Smoke - Wikipedia
First we need to know some of the basics
You may have some questions like
Why are we boost leak testing What is the boost leak tester really doing when we. The intercooler would have had smoke going through it because you pressurized at the turbo inlet If you have smoke from the hot air intake, i would bypass that and go directly to the turbo (inlet), forget the intake hose, it can't cause a boost leak (just unmetered air intake which will mess with maf readings).
Symptoms of a boost leak 🚩 hissing/whistling noises under acceleration Sluggish throttle response or delayed boost Check engine light (codes p0299, p2262) Excessive black smoke (diesel engines)
