Coolant temp drops on hard acceleration

Justao · 12-13-2021, 11:42 AM

Is anyone facing the same and is it a normal behaviour? Let's say my engine/coolant temp reaches the running temp ~110 (Celsius), but when I start flooring and driving in high rpms the temp starts dropping then after a normal driving it gets back to running temp. Today I floored from 50 to 150mph and the temp dropped twice from 110 to 50 C…

adeuel · 12-13-2021, 11:53 AM

Electronically controlled thermostat?

Justao · 12-13-2021, 01:39 PM

Quote:

Originally Posted by adeuel

Electronically controlled thermostat?

Does it mean its faulty or is expected behaviour?

DDD31 · 12-13-2021, 02:05 PM

Mine does the same thing when hammering the car. These engines run hot with the twin turbos and I think it's the car's response to making sure engine stays cool when extracting maximum performance from the engine. My cooling fan always runs after I shut down the car no matter how gently I drive the car and when I'm really pushing it, the fan runs at high speed for ~10 minutes after shutdown. The beast needs to stay cool.

adeuel · 12-13-2021, 02:24 PM

Quote:

Originally Posted by Justao

Does it mean its faulty or is expected behaviour?

Expected I would think, anticipating heavy load.

swagon · 12-13-2021, 03:39 PM

Thermostat doing its thing as intended, then. Nothing to worry about.

BobsM3Coupe · 12-13-2021, 08:08 PM

Quote:

Originally Posted by DDD31

Mine does the same thing when hammering the car. These engines run hot with the twin turbos and I think it's the car's response to making sure engine stays cool when extracting maximum performance from the engine. My cooling fan always runs after I shut down the car no matter how gently I drive the car and when I'm really pushing it, the fan runs at high speed for ~10 minutes after shutdown. The beast needs to stay cool.

My 21 X5MC also does the same thing.

m5eattle · 12-13-2021, 11:12 PM

Quote:

Originally Posted by Justao

Is anyone facing the same and is it a normal behaviour? Let's say my engine/coolant temp reaches the running temp ~110 (Celsius), but when I start flooring and driving in high rpms the temp starts dropping then after a normal driving it gets back to running temp. Today I floored from 50 to 150mph and the temp dropped twice from 110 to 50 C…

Radiators doing their job. Lots of airflow over the fins at speed.

AngryInch · 12-14-2021, 10:30 PM

Mine does this too. The gauge moves a lot off the baseline. When I log it with JB4 from the ODB, it’s only moving a couple of degrees. I think the gauge has way more swing than it needs.

12-13-2021, 11:42 AM	#1
Justao Lieutenant 402 Rep 464 Posts Drives: BMW M8 F91 Join Date: Oct 2019 Location: UK iTrader: (0)	Coolant temp drops on hard acceleration Is anyone facing the same and is it a normal behaviour? Let's say my engine/coolant temp reaches the running temp ~110 (Celsius), but when I start flooring and driving in high rpms the temp starts dropping then after a normal driving it gets back to running temp. Today I floored from 50 to 150mph and the temp dropped twice from 110 to 50 C…
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12-13-2021, 11:53 AM	#2
adeuel Lieutenant 317 Rep 516 Posts Drives: 2021 Oxford Green M5C Join Date: Mar 2016 Location: Rochester NY iTrader: (0)	Electronically controlled thermostat? __________________ Current: 2021 Oxford Green over Caramel M5C 2022 Ford Mustang Mach 1 : 2021 Yukon Denali : 2011 Ti Silver 128i 6MT, Koral Gone: 2021 Carbon Black X7 M50i : 2018 SG M5 2016 Med Blue 650ix GC : 2008 BSM 535i 6MT 1999 Jet Black 528i
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12-13-2021, 02:05 PM	#4
DDD31 Captain 1649 Rep 891 Posts Drives: 24 M3CS, 95 E320, 85 300CD Join Date: Jul 2015 Location: Michigan iTrader: (0)	Mine does the same thing when hammering the car. These engines run hot with the twin turbos and I think it's the car's response to making sure engine stays cool when extracting maximum performance from the engine. My cooling fan always runs after I shut down the car no matter how gently I drive the car and when I'm really pushing it, the fan runs at high speed for ~10 minutes after shutdown. The beast needs to stay cool. __________________ 2021 MBB M5C (retired) 2018 Daytona Violet M3 ZCP (retired), 2016 AW 550i (retired) 2013 EBII 335i (retired), 2008 Platinum Bronze 535xi (retired), 2007 Monaco Blue 335i (retired) 1999 Hellrot M3 coupe (retired)
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12-13-2021, 03:39 PM	#6
swagon Major General 13572 Rep 8,189 Posts Drives: F80 6MT Join Date: Jun 2013 Location: . iTrader: (0)	Thermostat doing its thing as intended, then. Nothing to worry about. __________________
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12-14-2021, 10:30 PM	#9
AngryInch Lieutenant 213 Rep 548 Posts Drives: 2021 BMW M5 Comp Join Date: Jul 2021 Location: Canada iTrader: (0)	Mine does this too. The gauge moves a lot off the baseline. When I log it with JB4 from the ODB, it’s only moving a couple of degrees. I think the gauge has way more swing than it needs.
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