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F30 / F31 / F32 / F33 / F34 / F36 (2012 - current)
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  #1  
Old 08-16-2015, 04:59 PM
CCMJTF_BMW CCMJTF_BMW is offline
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Mein Auto: 2014 BMW 328xi Sport
Temp Gauge

Have a 2014 328i xDrive, Sport. Drive mostly in stop-and-go traffic, but highway driving happens several times a week.

Something odd, and wanted to know if anyone else noticed, or is it my car: Temp Gauge has 160 / 250 / 340 markers, in F. Halfway markers between each of those. My car regularly (in any outside temp) runs just below the halfway marker between 160 and 250, in stop-and-go especially.

On the highway, the temp gauge runs up well past that marker and toward the 250, at highway speeds, 55mph and upward. Doesn't matter if the AC is running or not. Weirder yet, when I have to stop for a red-light on the highway, nearly immediately when coming to stop I can actually watch the temp gauge go down to where it normally sits, just below the halfway marker between 160 and 250. Start moving again and within 1 minute or so at highway speeds the gauge goes right up there again.

I searched these forums and couldn't find anything on this from a previous post. Hope I'm not being repetitive. And hope this is normal.

Thanks everyone. JF
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  #2  
Old 08-16-2015, 05:57 PM
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jimpal jimpal is offline
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I have a 2014 328i Sports Wagon. I do mostly highway or neighborhood streets, and almost no stop and go. Once my car warms up the needle never goes above 250, but always stays to the left of 250 between 250 and the halfway marker below. It never fluctuates as you describe, but finds its place and stays there. I've driven the car in temperatures between -15F and 100F. In my experience your car's behavior is not normal.

Last edited by jimpal; 08-16-2015 at 06:00 PM.
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Old 08-16-2015, 06:12 PM
f30jojo f30jojo is online now
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My wife's 2013 320 does exactly what your talking about. The only explanation I can think of is: the gauge is oil temperature not coolant. At higher engine speeds the oil will be hotter. My 320 has never gone over 250, and in winter never goes above the second tick mark.
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Old 08-16-2015, 06:18 PM
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The cooling system is electronically controlled. It's designed to run cooler when there's higher loads on the engine (i.e. spirited driving, or stop and go in the OP's case) for better performance. When there's a light load (e.g. steady state highway cruising) the temp goes up for better fuel economy.
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Old 08-16-2015, 06:19 PM
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like2ace like2ace is offline
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On a recent 1000 mile trip, the gauge stayed consistently between the 250 and 160 markers even at 80 mph and 100 F. I have a 328i and the gauge never touched 250F (halfway mark).
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Old 08-16-2015, 06:26 PM
CCMJTF_BMW CCMJTF_BMW is offline
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Thank you. This is what I suspected, but wasn't sure. I worded my original question poorly however. My car never gets to 250F... the highest it goes is 2 markers below 250. Thanks again! JF
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Old 08-16-2015, 06:30 PM
LJM3 LJM3 is offline
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I recently installed an M Performance steering wheel that gives me a digital display of the oil temp and other readings. I will take notes of the temp at different driving styles and report my findings with what the digital display reads as the display is numerical and will give a more precise reading.
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Old 08-16-2015, 06:44 PM
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Just to be clear, the gauge displays oil temperature, not coolant temperature.
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Old 08-16-2015, 07:13 PM
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Quote:
Originally Posted by chiefneil View Post
The cooling system is electronically controlled. It's designed to run cooler when there's higher loads on the engine (i.e. spirited driving, or stop and go in the OP's case) for better performance. When there's a light load (e.g. steady state highway cruising) the temp goes up for better fuel economy.
This. ++

BTW, 328d cars have water temp guages. ???What???
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Old 08-17-2015, 07:13 AM
Hangman4358 Hangman4358 is offline
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Quote:
Originally Posted by floydarogers View Post
This. ++

BTW, 328d cars have water temp guages. ???What???
They don't. I don't know what the others have been drinking. It's pretty clearly labeled as an oil temp gauge in the cluster.
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Old 08-17-2015, 07:34 AM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by CCMJTF_BMW View Post
... Something odd... Temp Gauge has 160 / 250 / 340 markers, in F... On the highway, the temp gauge runs... toward the 250... Weirder yet, when I have to stop for a red-light on the highway, nearly immediately when coming to stop I can actually watch the temp gauge go down to where it normally sits, just below the halfway marker between 160 and 250. Start moving again and within 1 minute or so at highway speeds the gauge goes right up there again...
At speed, the oil temperature goes up and the coolant temperature tries to go down (but the thermostat maintains it steady).
Stopped in traffic, the oil temperature goes down, and the coolant temperature tries to go up (but the thermostat and fan maintain it steady).
If you want to watch coolant temperature, get a ScanGauge. I have them on all my cars, Z3 in the picture.
http://www.scangauge.com
http://i49.photobucket.com/albums/f2...ps0ee4d6bf.jpg
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Old 08-17-2015, 07:36 AM
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Quote:
Originally Posted by chiefneil View Post
The cooling system is ... designed to run cooler when there's higher loads on the engine (i.e. spirited driving, or stop and go in the OP's case) for better performance. When there's a light load (e.g. steady state highway cruising) the temp goes up for better fuel economy.
The cooling system is designed to maintain a steady optimum temperature under all conditions. I have dashboard digital temperature gauges plugged into the OBD ports of all my cars and that is what they show.

Last edited by vintage42; 08-17-2015 at 07:39 AM.
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Old 08-17-2015, 09:45 AM
f30jojo f30jojo is online now
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Quote:
Originally Posted by vintage42 View Post
The cooling system is designed to maintain a steady optimum temperature under all conditions. I have dashboard digital temperature gauges plugged into the OBD ports of all my cars and that is what they show.
Again, the gauge is oil temperature not coolant.
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Old 08-17-2015, 09:59 AM
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I wish the center dash display where some people have navigation had possibly 3 round gauges on a LED screen. My display is often set to the trip computer, which I find minimally useful.

If I had 3 gauges, I would choose coolant temperature and oil pressure. For the third gauge, maybe volts or amps. An altimeter or turbo boost gauge would be interesting but not that useful.
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Old 08-17-2015, 10:22 AM
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Quote:
Originally Posted by vintage42 View Post
The cooling system is designed to maintain a steady optimum temperature under all conditions. I have dashboard digital temperature gauges plugged into the OBD ports of all my cars and that is what they show.
From the N55 engine manual:

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.

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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Old 08-17-2015, 10:30 AM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by f30jojo View Post
Again, the gauge is oil temperature not coolant.
Yes, if you want to see coolant temperature, you must install a digital gauge that plugs into the OBD port, like the ScanGauge.
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Old 08-17-2015, 10:38 AM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by chiefneil View Post
... 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
... In this way it is possible to influence the fuel consumption and
power output through the cooling system...
Very interesting, and I did not know. This explains why there is no coolant temperature gauge. There is no one normal temperature, and owners would be worried by seeing the variation. There are probably not many cars with such a sophisticated variable temperature controlled cooling system. My 1997 BMW maintains a steady 207F.

Last edited by vintage42; 08-17-2015 at 01:37 PM.
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Old 08-17-2015, 05:55 PM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by Hangman4358 View Post
They don't. I don't know what the others have been drinking. It's pretty clearly labeled as an oil temp gauge in the cluster.
You're right, I don't know what I was thinking - their is clearly an oil can below the thermometer. I've only driven the car a dozen times, clearly I'm not paying attention to temperature guage so a yellow/hot light is better for me...
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Old 08-17-2015, 06:23 PM
LJM3 LJM3 is offline
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My readings today taken from my M Performance steering wheel with digital readout for coolant temp and oil temp on a 2014 F30 M Sport with cruise control set to 65mph with outside temp 89 degrees.

Eco Pro: Oil temp: 228 Coolant temp: 225
Comfort: Oil temp: 225 Coolant temp: 221
Sport: Oil temp: 192 Coolant temp: 208

Interesting is that in eco pro with the least amount of power gave the highest temp readings while in Sport mode that raises the engines rpm's gave cooler temp readings. Keeping the coolant and oil cooler in sport mode makes sense as the car would have more power if cooler. I didn't have any stop and go traffic numbers but I would assume the same differences in each driving mode but higher temps due to slower speed.
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Old 08-17-2015, 07:27 PM
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Hookster57 Hookster57 is online now
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If you read the above post it explained the reasoning.....lower temp=more torque.
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Old 08-18-2015, 08:55 AM
LJM3 LJM3 is offline
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Hookster57, Thanks, I just read it. Well at least I know my car and steering wheel are working correctly.
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Old 08-21-2015, 06:47 PM
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Hookster57 Hookster57 is online now
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You carry insurance for firmware damage to sensitive car systems?
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Old 08-22-2015, 05:24 AM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by Linear Logic View Post
... curious if anyone here would be interested in helping test some BMW specific firmware we've been developing for the ScanGauge that may be able to display much more than just coolant temperature... I welcome any suggestions as to what might be useful to monitor with the ScanGauge...
As you know the ScanGauge already monitors a dozen or more engine items, the display box can only show 4 items at a time, and you push a button to rotate each item to another.
http://www.scangauge.com/products/scangaugeii/
http://s49.photobucket.com/user/vint...postlogin=true
I guess you are talking about evolving the ScanGauge to interface with iDrive and display coolant temperature or any other items there -- instead of on the separate box that must be dash-mounted and plugged into the OBD port?
http://s49.photobucket.com/user/vint...postlogin=true

Last edited by vintage42; 08-22-2015 at 06:53 AM.
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Old 08-24-2015, 04:07 PM
Linear Logic Linear Logic is offline
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Quote:
Originally Posted by Hookster57 View Post
You carry insurance for firmware damage to sensitive car systems?
We do carry insurance as it's requirement for being sold in retailers like Advance Auto and AutoZone. However, in the 10+ years we've been selling the ScanGauge we've yet to need it. Also, with the type of testing we'll be doing there are no modifications being made to the ECU, just simple parameter requests which don't harm anything.

We developed the base firmware we'll be testing on our company car which is a 2014 F56 MINI Cooper S, so it's fairly solid. The main goal is to see what's available on other BMW's and add that to the ScanGauge's capabilities.

Quote:
Originally Posted by vintage42 View Post
I guess you are talking about evolving the ScanGauge to interface with iDrive and display coolant temperature or any other items there -- instead of on the separate box that must be dash-mounted and plugged into the OBD port?
It's actually to just display on the ScanGauge itself. Interfacing with the iDrive system would be fun, but we've not developed anything capable of doing that. However it's something I'll look into though!

Finally, if anyone is interested in helping us add to the ScanGauge's BMW gauge reporting capabilities just send an E-mail to XGauge@Linear-Logic.com or simply me PM me here. I still have a few more development units I can send out, and once we're done testing you'll get to keep the ScanGauge!
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Old 08-24-2015, 05:36 PM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by Linear Logic View Post
... if anyone is interested in helping us add to the ScanGauge's BMW gauge reporting capabilities just send an E-mail...
So the present ScanGauge, which shows coolant temperatures on my Scion xB, Subaru Forester and BMW Z3, will not show it on a new BMW. And needs a F30 mule so this can be designed into it. I would think it worthwhile for both the mule owner and LinearLogic, especially with how much the F30's temperature varies by design. It would be fascinating to watch. I cannot do without a ScanGauge on every car I have.

Last edited by vintage42; 08-24-2015 at 05:39 PM.
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