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      01-30-2013, 02:47 PM   #1
kleach18
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Cooling mode

I was looking through the N55 engine PDF and found this.

Quote:
Engine cooling

The engine cooling system utilizes an electric coolant pump. The heat management determines the current cooling requirement and controls the cooling system accordingly. Under certain circumstances, the coolant pump can be completely switched off, e.g. to rapidly heat up the coolant during the warm-up phase. The coolant pump continues to operate when the hot engine is shut down. The coolant capacity can therefore be varied regardless of the engine speed. In addition to the characteristic map thermostat, the heat management makes it possible to use various characteristic maps for controlling the coolant pump. In this way the engine control unit can adapt the engine temperature to the driving conditions.

The engine control unit regulates the following temperature ranges:
108C/226F = Economy mode
104C/219F = Normal mode
95C/203F = High mode
90C/194F = High mode and control with characteristic map thermostat

The engine management sets a higher temperature (108C) when, based on vehicle operation, the engine control unit detects Economy mode. The engine is operated with relatively low fuel requirements in this temperature range. The internal engine friction is reduced at higher temperatures. The increase in temperature therefore results in low fuel consumption in the low load range. The driver wishes to utilize the optimum power developed by the engine in High and control with characteristic map thermostat mode. For this purpose, the temperature in the cylinder head is reduced to 90C. This temperature reduction promotes improved volumetric efficiency, thus resulting in an increased engine torque. Adapted to the relevant driving situation, the engine control unit can now regulate a defined operating range. In this way it is possible to influence the fuel consumption and power output through the cooling system.
I wonder if there is a way to change the settings... It seems like mine is always in economy mode(runs at 225 all the time)
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      01-30-2013, 02:52 PM   #2
kleach18
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On the next page of the PDF file. I'm sure most of you have already read through it, I thought it was cool though.

System Protection
If the coolant or the engine oil overheat during operation, certain vehicle functions are influenced to the effect that more energy is available to the engine cooling system.

These measures are divided over two operating modes:
Component protection
- Coolant temperature between 117C/242F and 124C/255F
- Engine oil temperature between 150C/300F and 157C/314F
- Result: The output of the air conditioning system
(up to 100%) and of the engine is reduced
Emergency
- Coolant temperature between 125C/257F and 129C/264F
- Engine oil temperature between 158C/316F and 163C/325F
- Result: The power output of the engine is reduced
(up to 90%)
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      01-30-2013, 03:14 PM   #3
Dackelone
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Pretty cool!
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      01-31-2013, 04:27 AM   #4
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When you get your jb4 that will allow you to run a Max cool option all the time. I have not tried it yet. Will post those vids soon bud
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