AAF E46 Low Temp Thermostat Kit

E46 Low Temp Thermostat Kit

BMW’s M54 engine was a solid step forward in the development of power, efficiency, and lower emissions, but those lower emissions came at a price. The factory thermostat is electronically controlled to keep the engine running around 103°C (217°F), whereas we like to maintain 80°C for maximum power. Additionally, the mechanical failsafe doesn’t open up until the coolant temperature reaches 110°C, or 230°F, which is about the point when we turn our race cars off and park them – it’s no wonder so many M54 engines get overheated and killed! Here’s where the E46 Low Temp Thermostat comes in. The AAF E46 M54 Low Temp Thermostat Kit is designed to give the control of proper engine operating temperature back to the owner/builder by replacing the stock electronic thermostat with a traditional mechanical unit. This allows the engine to run at the proper, and much safer, operating temperature, improving engine longevity, reducing stress from high temp operation,  preventing heat soak, and increasing power! This item is meant for race car use only.

Note that even with the best cooling system and our low temp kit you will not be able to maintain 71°C on hot days as we are still limited by the cooling system efficiency.

Full Kit: Thermostat Housing, Thermostat Housing Plate, Thermostat, install hardware, sealant

Partial Kit: Thermostat Housing Plate, Thermostat, install hardware

Need more cooling mods? Check out our Rad Mount Kit and fan shroud kit!

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