Logging coolant temps during commute, hot?
 

I have a 2009 with the 3.0 six. Just for kicks I started logging temps during my commute. Nothing really triggered this, the engine doesn't seem to smell hot or run hot on casual observation, I was just curious.

Outside air temp has been between 65f and 75f. The drive is 55 miles one way and consist of twisty mountain roads, highway and stop and go. The temp range I have noticed is 88c to 105c. She seems to average around 95c on the highway at 80 mph, will cool off to 88c during acceleration or a gradual climb up a hill. Will hop up to 105 to 107c during stop and go but usually drops to 99 quickly once it hits 107c.

Has anyone else bothered with this? Does it seem "normal"? Seems on the warm side to me but its the first time I have paid attention to a BMWs coolant temp. :p:

Oh BTW I did a search on here but I get an error when I search. Anyway doing a search on yahoo produced a thread stating that 225f was the normal operating temp for the coolant. Interesting.....

Your N52 engine when in economy mode, delivers the best results at 105C.
Digital Motor Electronic module is programmed to stabilize coolant temperature at 105C.
All normal.


How are you logging the temperature?
Are you able to log the electric coolant pump speed and temperature at the same time? You can graph it and get a better picture how DME controls ECP speed, temperature with engine load.





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TLDR: temps up to 112C seems fine for N52

From http://lindvigs.com/obioban/spec.pdf :

"The coolant pump also operates differently than conventional pumps when controlling the engine
temperature. To date, only the currently applied temperature could be controlled by the thermostat.
The software in the engine control unit now features a calculation model that can take into account
the development of the cylinder head temperature based on load.
In addition to the characteristic map control of the thermostat, the heat management system makes
it possible to use various maps for the purpose of controlling the coolant pump. For instance, the
engine control unit can adapt the engine temperature to match the current driving situation.
This means that four different temperature ranges can be implemented:
• 112°C ECO mode (economy)
• 105°C Normal mode
• 95°C High mode
• 80°C High + mapped thermostat mode
The coolant control sets a higher cylinder head temperature (112°C) if the engine control unit
determines ECO mode based on the current operating conditions.
The engine is operated with relatively low fuel consumption in this temperature range as the
internal friction is reduced."

Basically with Carly but no I have not saved any files or exported them toe Excel. I think this is possible though.

Just started doing the same, using Scan Gauge II. Lost the water pump last November on the road and wasn't able to know until it went into limp mode. Why they don't have a temp gauge is silly. Water temp range once driving ~100C - 105C. More important, also I'll be monitoring the Trans fluid temp as I occasionally tow a horse trailer.

Temp over that useless MPG needle any day. What a waste of space that thing is.

I drove thousands of miles never achieving closed loop because of the moronic temperature "lamp" that looks like a dial. It can be fixed I hope to fix mine