Temp Of 135's

[wjk_glynn]

Originally Posted by PG_DC5

copy pasted from another thread:

"Assuming they are the same as for the N54 engine in the 135i, this document says the following regarding oil and coolant temperatures:

Engine Management: http://www.1addicts.com/goodiesforyou/n54-2.pdf

Oil Temperature (page 49)
Up to 149C/300F - normal operation
150C/302F to 157C/315F - component protection mode
158C/316F and up - emergency mode

Coolant Temperature (page 50)
Up to 116C/241F - normal operation
117C/243F to 124C/255F - component protection
125C/257F and up - emergency"

Besides the upper thresholds/maximums listed above, the Engine Management System also has targets for the coolant temperature depending on the mode (page 47 of the same document):

• 108C/226F - ECO mode
• 104C/219F - Normal mode
• 95C/203F - High mode
• 90C/194F - High + map-thermostat mode

The document goes on to explain...

The control system aims to set a higher cylinder-head temperature (108°C) if the engine control unit determines ECO (economy) mode based on the engine performance. The engine is operated with relatively low fuel consumption in this temperature range as the internal friction is reduced.

An increase in temperature therefore favors slower fuel consumption in the low load range. In HIGH and map-thermostat mode, the driver wishes to utilize the optimum power development of the engine. The cylinder-head temperature is reduced to 90°C for this purpose. This results in improved volumetric efficiency, thus increasing the engine torque. The engine control unit can now set a certain temperature mode adapted to the respective operating situation. Consequently, it is possible to influence fuel consumption and power output by means of the cooling system.

The temperatures specified only ever represent a target value, the attainment of which is dependent on many factors. These temperatures are first and foremost not attained precisely.

The consumption-reducing and power increasing effects arise in each case in a temperature spectrum. The function of the cooling system is to provide the optimal cooling output according to the boundary conditions under which the engine is being operated.

Karl.

[OzJustin]

My car has a new water pump, thermostat and coolant and is running German Castrol oil (0w30) and sits on 120 degrees when fully warmed up. As others have mentioned 100-120 degrees is normal for a warmed up N54 engine.

[thezone135i]

Originally Posted by OzJustin

My car has a new water pump, thermostat and coolant and is running German Castrol oil (0w30) and sits on 120 degrees when fully warmed up. As others have mentioned 100-120 degrees is normal for a warmed up N54 engine.

Awesome news thanks!