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BMWcoder BMWcoder is offline
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Car: 335i 06
Default Coolant temperatur effect on fuel efficiency and emissions - 08-11-2017, 05:21 AM

Hi,

We all know the N54 runs just above 100degC under normal cruising. When going WOT, the coolant pump runs at higher speeds and maintains the temperature at approx. 90degC.

Why does is run at the higher temperature when cruising?
I've read a few technical articles online saying engine operating temperature (within the 90-105degC range) doesn't effect fuel efficiency really.
So, is it just to do with emissions?

I'm keen to run my N54 constantly at around 90degC just for the lifetime of the gaskets and other rubbers. I think the effect is quite significant. My N54 has so many oil leaks after 10yrs and 170Kkm, much more than my e36 M52b28 after 16yrs and 275Kkm. It's just frustrating me and since I'm able to flash my ECU with custom software I would like to know what the effect is on running lower temps constantly.
I'm not sure it it's just a setting I can change, haven't looked into MSD80 software much yet.
If it has effect on fuel efficiency, I may leave it just like this.

Thanks!
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xQx xQx is offline
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Car: 2008 BMW 135i E88 N54 6AT
Default 08-12-2017, 01:04 AM

It's an option when you flash a jb4 backend flash or a MHD map using the MHD flash software. Use the "sport" cooling option.
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BMWcoder BMWcoder is offline
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Default 08-15-2017, 03:36 AM

Anybody running that sport cooling option and willing to feedback its effect on fuel consumption?

Thanks!
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dyezak dyezak is offline
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Default 08-15-2017, 09:25 AM

It's all emissions. BMW even had a tech article back in 2008(ish) where they explained this. If you look hard enough you might be able to find it.

I've run the sport cooling option since it was release and had no impact to fuel consumption.
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najin23 najin23 is offline
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Default 11-13-2017, 08:49 AM

I have had the sport cooling for about couple weeks, and I haven't noticed anything significant except this morning with 145-155F degree for DD. It was very unusual. New pump/thermostat, and heating in the cabin is good. I thought it was some kind of a glitch, and started the engine back after 5min plus shut off. Still it wouldn't go higher than 155. I don't hear my fan runing. it was 46-48F ambient this morning.


Getting there:
'07 E92 6mt,
MMP stage3 hybrid,
MMP Inlet/Outlet,
MHD BMS hybrid E85 BEF,
3.5 bar,
E45,
Fuel-it! Stage 2 standard,
FBO,
Synchrotech(MFactory),
Bimmerlife R8 coils,
N20 plugs(0.020")
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limitdown limitdown is offline
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Default 11-14-2017, 10:31 PM

Nobody outside of BMW will know how much of an emission difference a lower water temp will have.
I've been running low water temp tunes since before MHD had it as a tick box option and haven't noticed any difference in fuel consumption. There are very noticeable drops in my water, oil and 6AT transmission fluid temps.
You should try to tick box and see if it makes a difference for you. It's extremely difficult to run temps that are too low, unless you're cruising downhill in subzero weather for an extended period of time.
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najin23 najin23 is offline
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Car: 335i CDV
Default 11-15-2017, 10:04 AM

Well, my water temp reading came back to normal all of a sudden. My car never struggled heating up nor my coolant was leaking. I thought it could be the temp sensor.....maybe. But for now, all I can say is that it was some sort of a glitch either from jb4 mobile or my 7 in tablet.


Getting there:
'07 E92 6mt,
MMP stage3 hybrid,
MMP Inlet/Outlet,
MHD BMS hybrid E85 BEF,
3.5 bar,
E45,
Fuel-it! Stage 2 standard,
FBO,
Synchrotech(MFactory),
Bimmerlife R8 coils,
N20 plugs(0.020")
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