The MSW E46 Enhanced Thermostat Housing (ETH) is an upgrade for all hard-use M52TU and M54 powered BMWs. It replaces the factory plastic housing with a machined billet aluminum piece that allows you to run a more dependable mechanical thermostat.
Running a pure mechanical thermostat allows for selecting a cooler temperature opening point, we typically run an 80C thermostat for Spec E46 and similar applications. Any M20 or M50 style thermostat will work, and we provided extra internal clearance for taller thermostats like the Mahle.
Eliminating the electronically controlled thermostat on the M52TU and M54 removes a major failure point in the critical cooling system. While the e-stat does have a failsafe mode, it’s opening temperature is extremely high and will often still lead to engine damage should it occur under race or track conditions.
-All aluminum construction
-Built-in bleed pass-through port for quicker bleeding of trapped air
-Included brass bleed screw on the housing itself allows for rapid bleeding of air from the head and block
-Two (2x) 1/8-27NPT threaded ports. One on the cold and one of the hot side of the housing. Easily integrate sensors for temp and/or pressure.
-Barbed hose fittings use standard E46 M3 upper and lower radiator hoses. Eliminates additional failure point of the clip-on style hoses and makes repairs at the track easier.
-3x M6 Socket head screws
-1x M8 Socket head screw
-1x Silicone Gasket
-2x 1/8NPT Brass Plugs w/ sealant
-1x Brass Bleed Screw
Notes: This product is intended for off-road use only. In an otherwise unmodified ECU/DME, you will have a diagnostic code for a failed electronic thermostat. This does not affect the running of the engine, but can affect your vehicle’s emissions compliance,
The latest version of our Test & Diagnostics DME has been updated to suppress the DTC for a removed electronic thermostat.
Developed by MSW and produced in the Carolinas.