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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Diesel Engine warm up and cool down time



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      09-21-2009, 01:15 PM   #1
Flyingman
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Diesel Engine warm up and cool down time

Folks,

Waiting to receive my 2010 335d and saw some discussion elsewhere about warm up/cool down periods. Can anyone say exactly what does the manual say about this?

Typically it is always good to give an engine a minute or two to warm up and cool down before putting in gear. I'm sure many folks don't do that.

I know some diesel cars actually have a shut off timer built in, that after you remove the key the engine keeps running for approx 1 minute to cool down the turbo. I certainly understand why you may want to do this, but is it built in that way on the BMW?

Most cars actually idle a bit higher when you first start them, then after about 30-60 seconds they slow down, and that is when I usually engage the gears. I also usually wait about 15-30 seconds before I turn off my engine, and that is with a gasoline engine, with and without a turbo.

I've heard that some engines (diesels and gas) with a turbo can have turbo damage if you shutdown with the turbo too hot, i.e. you were driving hard and then shut it down. As I recall the concern was that the housing and rotor are still rather hot and the oil stops circulating around the bearing, perhaps leading to a seizure.

Appreciate hearing what facts (or myths or urban legends) if any are out there about this on the BMW diesel engine.
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      09-21-2009, 01:37 PM   #2
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If you live in Miami why do you worry about warm up? Diesel engines are only problematic in the extreme cold climate If you live in Alaska . BMW turbos is water cooled . When you shut the the engine off an electric pump is still cooling the turbos off. Once its cool enough the pump willl stop circulating the coolant.
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      09-21-2009, 01:43 PM   #3
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Haven't you heard of Global Warming? Just preparing for the next ice age!

Good to know about the electric cooling water pump. I was not aware of that detail. I've heard of electric fans turning off after shutdown, but if it is circulating the water, that should work nicely.

Extreme cold temps for me is like 68 deg F. I almost can't get in my pool on those days. My pool temp has been around 87deg this summer.

Just was wondering what if anything is in the manuals on this subject.
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      09-22-2009, 02:17 AM   #4
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The only recommendation Ive seen is that they say advice a 1 minut cool down on idle if you have been pushing the engine hard or your over the nominal operating temps.

What kills diesels is mostly full throttle while the engine is cold. Just be careful with the throttle until you get to around 2/3ds of operating temps. After that, you can mash the throttle all you want. Then take it easy the last 2 miles home.

//amullo
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      06-24-2015, 05:52 AM   #5
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actually. this is a good question. 335d's doesn't even have an engine temperature inside of car and there isn't even any caution on the rev limiter that old m3 had with led lights indicating the numbers you can rev it at particular engine temperature. so this makes me thing that there isn't any precaution as to the driving and throttling the gas in regards to the engine temperature. maybe it's coz diesels have limited revs? or why would BMW not care putting the engine temperature gauge or anything like that?
i try to rev max 2000rpm first 5-10 minutes of driving using paddles, however, during the winter, i was at 2500rpm and barely moving in 6th gear, and on top, I had a vacuum leak, so I guess the turbos were given some beating there....
also, after some highway run, i also wait some time to cool down, but again, this is just a general opinion, or even bmw technicians. but it says nowhere at official BMW statement how to handle cold or hot diesels, or does it?
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      06-24-2015, 06:17 AM   #6
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bmw pours pretty liquid oil in their diesel and preheating coils activated when drivers door opened, so don't worry, start engine and drive, you will not have problem in Miami climate
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      06-24-2015, 09:08 AM   #7
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you can tell when the engine is cool, the turbos make funny noises and the engine is not as smooth as when it's warm.
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      06-24-2015, 11:21 AM   #8
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With the EGR blocked warm up will take a little longer.

Monitor the car with torque and see exactly how long it takes. It is also dependent upon the ambient temperature.

Cool down is totally different story. It takes a looong time.

There is no need for a turbo cool down unless you are in the middle of the regeneration or are racing on the streets.
The EGT will let you know haw hot the exhaust is and what the turbos get. If you are below 400F when you park the car, you're golden.
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      06-24-2015, 12:03 PM   #9
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Quote:
Originally Posted by chiaobaby View Post
...When you shut the the engine off an electric pump is still cooling the turbos off. Once its cool enough the pump willl stop circulating the coolant.
Quote:
Originally Posted by Flyingman View Post
...
Good to know about the electric cooling water pump. I was not aware of that detail...
Chiao is incorrect - the diesels have traditional belt-driven water pumps (unlike the N52/n54/n55). The water pump does not continue to run.

FYI, I have seen only a couple stories posted about turbo failure on bmw diesels on the www.

Also FYI, our diesels barely warm up if the temp is under, say 40 degrees F and you're not really stomping it. Get one of the OBD reader guages if you want to watch coolant temp.
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      06-24-2015, 02:40 PM   #10
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for a single test it easier to use instrument panel test, test no 7 will show coolant temp
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      06-24-2015, 03:15 PM   #11
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Borg Warner Turbo. Thing is an animal!
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      06-25-2015, 10:39 AM   #12
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Quote:
Originally Posted by Got_Diesel View Post
Borg Warner Turbo. Thing is an animal!
Forgive my ignorance but is being "an animal" a good thing or a bad thing?

Fwiw, the only difference I notice when cold is that the tranny holds gears a little longer.
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      06-25-2015, 05:39 PM   #13
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Quote:
Originally Posted by charlie fairmont View Post
Forgive my ignorance but is being "an animal" a good thing or a bad thing?

Fwiw, the only difference I notice when cold is that the tranny holds gears a little longer.
a good thing! it is very robust and durable. To be completely honest, it does suck and it sucks rather well! to the tune over 26.5psi!
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      06-26-2015, 12:52 AM   #14
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Quote:
Originally Posted by dixy2k View Post
With the EGR blocked warm up will take a little longer.

Monitor the car with torque and see exactly how long it takes. It is also dependent upon the ambient temperature.

Cool down is totally different story. It takes a looong time.

There is no need for a turbo cool down unless you are in the middle of the regeneration or are racing on the streets.
The EGT will let you know haw hot the exhaust is and what the turbos get. If you are below 400F when you park the car, you're golden.
Yep 400F or under is a good rule of the thumb. I have always done that with my diesel trucks as that is what most dieselheads recommend for longevity. Watching your EGT's is key to turbo and engine life along with a gentle warm up when starting off. Monitoring EGT and boost also keeps you in tune with what is going on with your engine along with coolant and oil temp.
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      06-26-2015, 01:02 AM   #15
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Fwiw, the only difference I notice when cold is that the tranny holds gears a little longer.[/quote]

In the programming of all modern vehicles to get the cats to "light-off" quicker to decrease emissions and also warmup time when cold. Promotes a leaner burn
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      07-09-2015, 01:57 AM   #16
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Quote:
Originally Posted by fsd350 View Post
Yep 400F or under is a good rule of the thumb. I have always done that with my diesel trucks as that is what most dieselheads recommend for longevity. Watching your EGT's is key to turbo and engine life along with a gentle warm up when starting off. Monitoring EGT and boost also keeps you in tune with what is going on with your engine along with coolant and oil temp.
How can you monitor the EGT and boost?
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      07-09-2015, 09:19 AM   #17
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Coolant temp can be monitored by temporarily unlocking the feature on your dash, search is your friend

Torque app with a BT OBD2 adapter if you have an Android phone, custom PID's from DWR here:http://www.e90post.com/forums/showth...ght=TORQUE+pid

If you have an iphone, Dashcommand is a decent app. You will need a Wifi OBD2 adapter. Not positive about EGT monitoring with this one, I'll check tonight and let you know

Also, Carly for BMW which can do coding as well
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      07-09-2015, 09:25 AM   #18
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No sure about diesel but standard gasoline engines do not need a warm up prior to driving. Just start the car, give it a few seconds for the initial RPM surge to settle and drive MODERATELY; meaning keep the shifts between 3-3.5k RPMs. Do this till you reach proper operating temps. If you did a lot of spirited driving then again drive moderately the last mile or two so that the car can cool down a bit. Don't worry about the turbos too much because the water pump will keep cooling them even when you turn the car off.
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      07-09-2015, 10:41 AM   #19
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Quote:
Originally Posted by Delta0311 View Post
No sure about diesel but standard gasoline engines do not need a warm up prior to driving. Just start the car, give it a few seconds for the initial RPM surge to settle and drive MODERATELY; meaning keep the shifts between 3-3.5k RPMs. Do this till you reach proper operating temps. If you did a lot of spirited driving then again drive moderately the last mile or two so that the car can cool down a bit. Don't worry about the turbos too much because the water pump will keep cooling them even when you turn the car off.
still no water to the turbos on the diesel
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      07-09-2015, 07:31 PM   #20
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As Hooper stated no water to the turbos on the diesel
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      07-09-2015, 11:13 PM   #21
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Quote:
Originally Posted by fsd350 View Post
Coolant temp can be monitored by temporarily unlocking the feature on your dash, search is your friend

Torque app with a BT OBD2 adapter if you have an Android phone, custom PID's from DWR here:http://www.e90post.com/forums/showth...ght=TORQUE+pid

If you have an iphone, Dashcommand is a decent app. You will need a Wifi OBD2 adapter. Not positive about EGT monitoring with this one, I'll check tonight and let you know

Also, Carly for BMW which can do coding as well
Thanks fsd350. I have started a list to start searching as I am new to the forum.
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      07-09-2015, 11:26 PM   #22
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Originally Posted by kg4kdn View Post
Thanks fsd350. I have started a list to start searching as I am new to the forum.
You bet. BTW dashcommand does not appear to have EGT functionality. Torque has many more PID's and customizations for our cars.
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