Turbo transmissions rely heavily on their lubrication systems to manage the friction and heat generated at high RPMs. These systems typically include a central pump, distribution channels, and oil cooling units. Maintaining optimal oil pressure not only extends bearing life but also minimizes power loss. What are your thoughts on the types of oil used and pressure settings in these systems?
How do turbo transmission lubrication systems work?
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Man, I also did a lot of research on this topic recently because I was going to examine the lubrication system in a turbocharged vehicle with my intern colleague. Okay, the topic is just the lubrication system, but I think the most critical point is the oil pressure settings. In the scenario I encountered, the pump was set to a normal working pressure of 5 bar, but there were flakings on the bearings. As we researched, we realized that the oil viscosity changes with heat, and if the pressure setting isn't variable, the oil film can thin out and break at high RPMs. In the end, we adjusted the pressure regulator by also checking the oil cooler in the system, and now it's running at 6 bar with no issues. I think it's important, bro, to revise the pressure setting not just based on the catalog but according to real usage conditions!
In these systems, the most critical thing is the oil type and viscosity recommended by the manufacturer. For example, my Audi 7G-Tronic requires oil with the "TL 55016" specification; otherwise, I run into issues adjusting the system pressure values. The pressure adjustments are also heavily dependent on the pump regulator, which is digitally controlled via signals in models with magnetic valves. Honestly, my car had oil pressure at 2 bar (in high gear) while it would jump to 5 bar (in low gear), but it was fixed once I switched to the original oil. Especially in turbocharged vehicles, the oil's heat resistance is crucial—viscosity loss and pressure drops occur in environments exceeding 120°C. Interventions made without considering manufacturer recommendations often lead to failures in DSG modules or torque converters.