The Mountain Pass Performance Nür rear drive-unit oil cooler is a bolt-on thermal-management upgrade for track-driven Tesla Model 3 vehicles. It removes heat directly from the rear drive-unit oil circuit, reducing the thermal load transferred into the shared powertrain cooling system.
Kit contents and construction
- Setrab oil-cooler core
- Built-in 342 CFM fan
- Aeroquip Starlite motorsport hoses with crimped fittings
- CNC-machined MPP oil-filter plate designed for the Model 3 rear drive unit
- 1/8-inch NPT port for temperature sensing or fan-switch control
- Laser-cut aluminum mounting brackets
Brackets and filter plate are made in Canada, oil lines are made in the USA, and the cooler is made in Sweden.
Why rear drive-unit cooling matters
The Model 3 rear drive-unit oil cools the motor stator and rotor while lubricating and cooling the gear reduction and differential. On track, this oil can become the hottest fluid in the vehicle. The published thermal limits described for the system are approximately 115°C at the stator, approximately 60°C at the battery, and coolant temperatures near 30°C to support battery cooling.
Removing heat from the oil before it reaches the factory oil-to-coolant heat exchanger reduces heat entering the powertrain coolant loop. This can also reduce load on the radiator and air-conditioning system as they manage drive-unit and battery temperatures.
Published track test
MPP tested the cooler on a Long Range rear-wheel-drive Model 3 with the air-conditioning compressor disabled. Without the cooler, the rear drive unit overheated after two laps, or approximately three minutes. With the cooler installed and the compressor still disabled, only mild power reduction began after approximately 15 minutes. These results describe that specific test vehicle and test configuration; results will vary with vehicle, ambient conditions, track, and driving load.
This is a performance cooling component intended for drivers who understand the installation and monitoring requirements of a modified track vehicle.