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BMW Rear Sway Bar
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Cooling Solutions . Z4 Series:  BMW M54 Competition Thermostat Housing Kit

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Item Description

M54 Competition Thermostat Housing Kit

We have noted more M54 engine failures due to overheating than on any of BMW's previous engines.

Based on design changes to the M54, we infer that the problem is peak operating temperature that is too high; according to BMW's technical literature, the factory thermostat is computer controlled to operate from 80 ° C to 103 ° C. BMW also reports that a mechanical failsafe does not open until the coolant temperature reaches 110 ° C. That's a 230 ° F temperature band, which may also contribute to engine failures.

As too many can attest, temperature related failures often end with engine replacement. M54 engines have aluminum blocks which are subject to having the head bolts strip the block of its threads.

Our Competition Thermostat Housing, machined from billet T-6061 aluminum and anodized for protection, is designed to return the selection of normal engine operating temperature to the owner/builder and improve engine longevity by replacing the failure prone plastic electronically-controlled thermostat with a mechanical unit. (Replaces BMW part no. 11 53 7 509 227)

The cover on the sensor plug harness may require removal to clear the fan once installed.


I.Reduced Engine stress
Less volatility in temperature changes
Lower maximum engine temperature
Lower target engine temperature
II.Improved Engine Performance Potential
Higher compression
Forced induction
Safer track use
III.Lower Long Term Operating Costs
Reduced operating and heat soak pressures will reduce cooling system component failures.
Lengthened gasket life due to less extreme temperature cycling
Easy thermostat changes or maintenance (About 15 min. if using our radiator.)
IV.Improved Engine Appearance
Polished housing
Anodized for protection

What's in the Kit?

T-6061 Aluminum T-Housing (1)
Thermostat Housing Gasket (1)
Mechanical Thermostat (1)
Thermostat O-Ring (1)
Temperature Sender (1)
Seal Ring (1)
Stainless Steel Bolt (4)
Stainless Steel Washer (4)

Application Guide
E83 X3 2.5i, X3 3.0 M54
E53 X5 3.0i
E85 Z4 2.5i, Z4 3.0i M54
E46 323i, 323ci, 325i, 325ci 325xi, 328i, 328ci, 330i, 330ci, 330xi
E36 Z3 2.3, Z3 2.5i, Z3 2.8 from 09/98, Z3 3.0i
E39 525i, 528i from 09/98, 530i
E60 525i M54, 530i M54

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