OBC 19.7.00 - Watcha' go? doityourself

[shanneba]

Here is a similar graph from data taken in July of 2010.
It looks like the thermostst starts to open at about 180F ~ 82C A little easier to see in this graph.

Red is coolant temp in engine
orange is oil temp
blue is coolant temp at the radiator outlet
green is engine speed

[shanneba]

My 2003 is 02/2003 production with the MS43 DME.
Original thermostat.
Stewart pump, standard pullies.
Red Line water wetter / 50/50 BMW coolant.
Dinan Stage 2 software
Auto trans

[Oli77]

Actually, I don't see what you mean, when the red line reaches ~150F, there is a slow down in the rate temperature rise (opened t-stat?), and then the rate is faster and then it plateaus at ~190.

I don't see anything pointing to 180F.

[shanneba]

The blue line, radiator outlet temp, doesn't start to rise until the engine temp hits 180F indicating coolant is flowing through the radiator to the lower hose.
It could be opening a little before 180F, and it takes until 180F for the pump to circulate coolant equal to the volume in the radiator.

[terraphantm]

Numbers are in Celsius, once plateau is reached.

Oli77 [2005 2.5L M54 DME-MS45.1] : 96
Danewilson77 [2004 3.0L M54 DME-MS45.1] : 95
Telijah [2001 3.0L M54 DME-MS43] : 88 (suspects open T-stat)
edlvrt [2004 3.0L M54 DME-MS45.1] : 96
MrMaico [2004 3.0L M54 DME-MS45.1]: 96
Spencers [2001 2.5L M54 DME-MS43] : 90
LivesNearCostco [2003 3.0L M54 DME-MS45.1] : 91 (old T-stat)
LivesNearCostco [2003 3.0L M54 DME-MS45.1] : 95 (new T-stat)
derbo [2004 3.0L M54 DME-MS45.1] : 95
GT172I [2004 3.0L M54 DME-MS45.1] : 96
shanneba [2003 3.0L M54 DME-MS43] : 89 (when in 2003?)
Hochspannung [2005 3.0L M54 DME-MS45.1] : 87 that's the outlier, unless these are the M car values.
Kayger12 [2005 3.0L M54 DME-MS45.1] : 95
RITmusic2k [2004 3.0L M54 DME-MS45.1] : 83 T-stat work ongoing
terraphantm [xxxx 3.0L M54 DME-MS45.1] : 95 provide year on non-M
Hermes: [xxxx 3.0L M54 DME-MS45.1] = 95 provide year please

Please check if I got these right.

Mine was a 2003 ZHP

[Oli77]

Numbers are in Celsius, once plateau is reached.

Oli77 [2005 2.5L M54 DME-MS45.1] : 96
Danewilson77 [2004 3.0L M54 DME-MS45.1] : 95
Telijah [2001 3.0L M54 DME-MS43] : 88 (suspects open T-stat)
edlvrt [2004 3.0L M54 DME-MS45.1] : 96
MrMaico [2004 3.0L M54 DME-MS45.1]: 96
Spencers [2001 2.5L M54 DME-MS43] : 90
LivesNearCostco [2003 3.0L M54 DME-MS45.1] : 91 (old T-stat)
LivesNearCostco [2003 3.0L M54 DME-MS45.1] : 95 (new T-stat)
derbo [2004 3.0L M54 DME-MS45.1] : 95
GT172I [2004 3.0L M54 DME-MS45.1] : 96
shanneba [2003 3.0L M54 DME-MS43] : 89 (running water wetter and stewart pump)
Hochspannung [2005 3.0L M54 DME-MS45.1] : 87 that's the outlier, unless these are the M car values.
Kayger12 [2005 3.0L M54 DME-MS45.1] : 95
RITmusic2k [2004 3.0L M54 DME-MS45.1] : 83 T-stat work ongoing
terraphantm [2003 3.0L M54 DME-MS45.1] : 95
Hermes: [xxxx 3.0L M54 DME-MS45.1] = 95 provide year please

[Oli77]

The blue line, radiator outlet temp, doesn't start to rise until the engine temp hits 180F indicating coolant is flowing through the radiator to the lower hose.
It could be opening a little before 180F, and it takes until 180F for the pump to circulate coolant equal to the volume in the radiator.

OK totally see that now. Thanks, clear as a bell. ~180 F

[Hermes]

Numbers are in Celsius, once plateau is reached.

Oli77 [2005 2.5L M54 DME-MS45.1] : 96
Danewilson77 [2004 3.0L M54 DME-MS45.1] : 95
Telijah [2001 3.0L M54 DME-MS43] : 88 (suspects open T-stat)
edlvrt [2004 3.0L M54 DME-MS45.1] : 96
MrMaico [2004 3.0L M54 DME-MS45.1]: 96
Spencers [2001 2.5L M54 DME-MS43] : 90
LivesNearCostco [2003 3.0L M54 DME-MS45.1] : 91 (old T-stat)
LivesNearCostco [2003 3.0L M54 DME-MS45.1] : 95 (new T-stat)
derbo [2004 3.0L M54 DME-MS45.1] : 95
GT172I [2004 3.0L M54 DME-MS45.1] : 96
shanneba [2003 3.0L M54 DME-MS43] : 89 (running water wetter and stewart pump)
Hochspannung [2005 3.0L M54 DME-MS45.1] : 87 that's the outlier, unless these are the M car values.
Kayger12 [2005 3.0L M54 DME-MS45.1] : 95
RITmusic2k [2004 3.0L M54 DME-MS45.1] : 83 T-stat work ongoing
terraphantm [2003 3.0L M54 DME-MS45.1] : 95
Hermes: [2005 3.0L M54 DME-MS45.1] = 95

[MrMaico]

OK totally see that now. Thanks, clear as a bell. ~180 F

But that's an MS43 DME. The post 3/2003 MS45.1 (ZHP etc.) opens at 95 or 96 degrees.

[MrMaico]

I'm not sure what conditions makes it do so though

During harder running, higher revs, the DME turns on the stat heater to open it at lower temps. I see my temp drop 10 to 15 degrees F every time I run through a few gears at revs above 5000 or so.