There’s five components that are needed to properly operate and manage your sequential twin turbocharger setup on your 2JZGTE. What is the 2JZGTE Sequential Turbo System? Today I’ll be showing you how to troubleshoot 2JZGTE sequential turbos by locating and testing each of the 5 sequential components, and explaining where each VSV is located and how it works. We’ll also go over how to test each vacuum unit for proper operation and check that the valve’s resistance is within specification. Like all plunger style valves, the VSV can become clogged, contaminated or bind when fully extended. When one side of the VSV valve receives this pressure, the diaphragm presses against the rod which opens the valve. These VSV control units are basically diaphragm plungers that opens when the right amount of pressure is applied. These vacuum switching units help control various items on your 2JZGTE, from sequential turbocharger control to emissions. When your 2JZGTE is having problems boosting on a stock sequential setup, chances are your VSV actuators are to blame. Whether you are fixing an issue or modifying your Toyota VSV system to change how the turbos work, this writeup will help you diagnose your sequential turbo problem. Common issues with the 2JZGTE sequential turbos can range from turbos spooling incorrectly, very slowly or not at all. But learning how to troubleshoot 2JZGTE sequential turbos can be easy and very straightforward once you get down to it. Toyota’s unique sequential turbo system found in the 1994-1998 Twin Turbo Supra can be very technical and complicated to the uninitiated.
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