OBC 19.7.00 - Watcha' go? doityourself

[Oli77]

Numbers are in Celsius once reached a plateau.

Oli77: 96
Dane: 95
Telijah: 88
edlvrt: 96
MrMaico: 96
Spencers: 90
Livesnearcostco: 91
derbo: 95
GT172I: 96
shanneba: 89
Hochspannung: 87
Kayger12: 95
RITmusic2k: 83
terraphantm: 95

I am still scratching my head about noting the DME version for each user. Can I just assume the version based on the date of the car ?

[MrMaico]

I am still scratching my head about noting the DME version for each user. Can I just assume the version based on the date of the car ?

That's what I was thinking.....maybe just year and engine size/type?

2004 3.0L M54 ZHP

Not everyone is going to know which DME they even have.

[terraphantm]

In general, with the E46:

• M52s use MS42
• US M54s before 03/2003 and Euro M54s use the MS43
• US M54s 03/2003 and later use the MS45.1 (therefore all ZHPs use the MS45.1)
• M56s (325 SULEVs) use the MS45.1 (regardless of build date).

[Oli77]

OK I'll edit based on the entries we have...

[LivesNearCostco]

Put in new T-stat, drove to recycling center to dispose of old coolant then drove to work in ambient temps of 65-68F. Now OBC displays 95C when moving (occasional 96C) and moves between 96-99C when stopped or in traffic. My old T-stat was either stuck open or opening too soon. Old T-stat was BMW brand with 85,000 miles on it. New T-stat is Wahler with 10 miles on it. In 4-6 weeks I should know if this improves my gas mileage. Edited table below.

Numbers are in Celsius once reached a plateau.
Oli77: 96
Dane: 95
Telijah: 88
edlvrt: 96
MrMaico: 96
Spencers: 90
LivesNearCostco old T-stat: 91 (77-91 while moving)
LivesNearCostco new T-stat: 95 (95-96 while moving)
derbo: 95
GT172I: 96
shanneba: 89
Hochspannung: 87
Kayger12: 95
RITmusic2k: 83
terraphantm: 95

[Hermes]

Oli77: 96
Dane: 95
Telijah: 88
edlvrt: 96
MrMaico: 96
Spencers: 90
LivesNearCostco old T-stat: 91
LivesNearCostco new T-stat: 95
derbo: 95
GT172I: 96
shanneba: 89
Hochspannung: 87
Kayger12: 95
RITmusic2k: 83
terraphantm: 95
Hermes: 95

[Oli77]

Put in new T-stat, drove to recycling center to dispose of old coolant then drove to work in ambient temps of 65-68F. Now OBC displays 95C when moving (occasional 96C) and moves between 96-99C when stopped or in traffic. My old T-stat was either stuck open or opening too soon. Old T-stat was BMW brand with 85,000 miles on it. New T-stat is Wahler with 10 miles on it. In 4-6 weeks I should know if this improves my gas mileage. Edited table below.

Win! Low reading = failed T-stat?

[terraphantm]

Win! Low reading = failed T-stat?

Probably - I'm pretty sure the only reason my M3 runs at 83 is because the T-stat is designed to open up at 82. In the non-Ms, I believe it opens up at 95. However, the DME can open the T-stat at lower temperatures if it wants to. I'm not sure what conditions makes it do so though

[Oli77]

Take a look at this, I think 89 is the number where that sucker opens:

My last trip where I recorded data showed an engine coolant temp max of 192F ~ 89C. (March 15th 2012)

Here is some BMW info on the thermostat MAP:

http://wds.spaghetticoder.org/en/zin...1214_M0KFK.htm

Here is some data recorded with AutoEnginuity software from my 2003 330Ci that shows the operation of the MAP thermostat.
Blue is the oil temp
green is the coolant temp in the engine
orange is the coolant temp at the radiator outlet
red is the engine rpms

You can see when the load/rpms increase, the thermostat opens to cool the engine. The coolant temp at the radiator outlet increases with the higher flow.
I see this start normally around 3000 rpms under load.

I have the stewart water pump, original thermostat, original pulleys and I run Red Line Water Wetter.
I see about a 5-8 F degree drop in my coolant temps when running the water wetter. Not much.

[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 (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.