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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 > 335d engine coolant temperature



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      10-10-2016, 11:52 AM   #1
Owen81
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335d engine coolant temperature

Heya,

I have a 2009 335d with Jarek 2.5 tune DPF/SCR removed and Andrew's EGR delete.

Now that its getting cold up here in Canada(-1°C this morning), I noticed my instant MPGs weren't quite where they used to be.

I opened torque and started monitoring the engine coolant temps, it seems that they hover around 72°C, getting up to around 78°C with some spirited acceleration but always coming down to around 70-72°C again.

I'm under the impression that our T-stat should operate at 90°C and this is where the coolant temp should be at during steady state driving, so my T-stat could be bad. I was just wondering if this would be the case, or if anyone else with the EGR delete has noticed their coolant temps being lower than normal?

Thanks
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      10-10-2016, 12:08 PM   #2
335dM
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86 degree
Your stat needs to be replaced!
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      10-10-2016, 12:33 PM   #3
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Swap it. It's cheap and easy!
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      10-10-2016, 01:10 PM   #4
Owen81
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Will do! Any idea how much coolant I will need after the swap? I assume a lot is going to come out of the pump...
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      10-10-2016, 02:26 PM   #5
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I recall losing a couple quarts. Just go buy the jug of coolant and mix 50/50. It might be time for you to do a coolant change anyway. I have it from a reliable source (Mike Miller) that it's every 2 yrs
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      10-10-2016, 02:29 PM   #6
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I also have Jarek tune (2.0). My temps never go over 81 degrees, just hover around 74-78.
Fuel economy also down

Does anyone have a DiY writeup for thermostat change?
Any recomendations on which one to get??

Thanks
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      10-10-2016, 03:01 PM   #7
Owen81
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Quote:
Originally Posted by Poosik View Post
I also have Jarek tune (2.0). My temps never go over 81 degrees, just hover around 74-78.
Fuel economy also down

Does anyone have a DiY writeup for thermostat change?
Any recomendations on which one to get??

Thanks
Do you have the EGR cooler delete as well?
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      10-10-2016, 03:29 PM   #8
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Yeah, EGR cooler is physically off
The inlet for EGR is plugged and throttle body that EGR connected to is replaced with a "race pipe" from ebay.
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      10-10-2016, 03:43 PM   #9
Owen81
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And you completed the cooling circuit with a line where the cooler would be like in this picture?

Photo courtesy of www.fixmyvw.com
http://cdn1.bigcommerce.com/server41...g?t=1462413336

I was wondering if this maybe provides a bypass for the coolant and that is why the temperatures are low?

Last edited by Owen81; 10-10-2016 at 03:55 PM..
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      10-10-2016, 03:55 PM   #10
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Yes, my coolant line is just like that.

The egr delete & coolant bypass were done about 2 months ago

The Jarek abc delete tune is about 2 years old.

That is when i actually started to monitor things with the obd2 dongle

My temps have always been in the range of 72-80ish

Rate of temp rise did not appear to change after egr coolant line was bypassed.

Good thought though!


I vaguely recall forum members writing up a diy for thermostat change.. also about installing a "higher temp" one...
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      10-10-2016, 04:35 PM   #11
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Ah I see.
Looks like ours is very close to this DIY, and it should be much easier with the cooler out of the way!

http://www.e90post.com/forums/showthread.php?t=1008568
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      10-11-2016, 08:09 AM   #12
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Watching thread closely. Please let me know where you order t-stat from and if it solves the issue. With outside temp this am at 37F, coolant temp hovered at 76-78C.
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      10-11-2016, 01:46 PM   #13
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Quote:
Originally Posted by dmanb2b View Post
Watching thread closely. Please let me know where you order t-stat from and if it solves the issue. With outside temp this am at 37F, coolant temp hovered at 76-78C.
http://www.bmwdirectparts.com/oe-bmw/11517805811

This is where I bought replacement T/S from. The above link already has the T/S loaded up for you. They used to be called Husker but it is still same dealer in Lincoln, Nebraska. Just a little over $50.

I have found it a good practice to throw in a couple oil filters, perhaps a fuel filter and other regularly serviced items to make the most of the shipping cost. I have a order in right now but one of the items has to come from Germany so it will take an extra week or so.
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      10-11-2016, 04:26 PM   #14
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Quote:
Originally Posted by BB_cuda View Post
http://www.bmwdirectparts.com/oe-bmw/11517805811

This is where I bought replacement T/S from. The above link already has the T/S loaded up for you. They used to be called Husker but it is still same dealer in Lincoln, Nebraska. Just a little over $50.

I have found it a good practice to throw in a couple oil filters, perhaps a fuel filter and other regularly serviced items to make the most of the shipping cost. I have a order in right now but one of the items has to come from Germany so it will take an extra week or so.
Thank you!
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      10-11-2016, 04:32 PM   #15
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I got mine last month from ECS tuning for $55.95 including regular (slow boat) shipping.
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      10-11-2016, 08:54 PM   #16
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Just ordered the TS from ECSTunning. $50 ish & free shipping.

I will post update after install.

Today ambient temp in 40's and with coolant reaching MAX 74 deg after a 20mile drive. Mix driving.

Really hoping the temps improve.
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      10-11-2016, 10:56 PM   #17
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Quote:
Originally Posted by Poosik View Post
Yes, my coolant line is just like that.

The egr delete & coolant bypass were done about 2 months ago

The Jarek abc delete tune is about 2 years old.

That is when i actually started to monitor things with the obd2 dongle

My temps have always been in the range of 72-80ish

Rate of temp rise did not appear to change after egr coolant line was bypassed.

Good thought though!


I vaguely recall forum members writing up a diy for thermostat change.. also about installing a "higher temp" one...
Does anyone know about this higher temp t-stat thread? Where to find part? I'm very interested. Mine took 10 minutes of freeway driving to reach 78 Celsius today on a cool day (70's F). It would help fuel economy a lot.

Also: EGR cooler deletes always cost about 10% fuel economy hit in northern climates. Longer warm up times are also hell on engine wear.
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      10-13-2016, 05:40 PM   #18
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Quote:
Originally Posted by nicklockard View Post
...
Also: EGR cooler deletes always cost about 10% fuel economy hit in northern climates. Longer warm up times are also hell on engine wear.
I had heard this as well. However, it has not born out on my vehicles. My Cummins doesn't have EGR, takes a VERY long time to warm up (unless pulling a load), and has had great UOA's along the many years of ownership.

My 335d showed improved mpg's (tracked every single fillup since new) and less wear on UOA's since doing the EGR delete, even though it takes much longer to warm up. And it rarely gets above 174F, unless very hot weather and running A/C, or doing multiple 1/4 mile passes in succession.

Some of the UOA's can be seen here: http://www.e90post.com/forums/showthread.php?t=1045534

I keep thinking about swapping the T-stat, but haven't measured a reason to fuss with it yet.
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      10-13-2016, 05:59 PM   #19
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Quote:
Originally Posted by TDIwyse
And it rarely gets above 174F, unless very hot weather and running A/C, or doing multiple 1/4 mile passes in succession.

I keep thinking about swapping the T-stat, but haven't measured a reason to fuss with it yet.
+1
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      10-13-2016, 10:18 PM   #20
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Quote:
Originally Posted by TDIwyse View Post
I had heard this as well. However, it has not born out on my vehicles. My Cummins doesn't have EGR, takes a VERY long time to warm up (unless pulling a load), and has had great UOA's along the many years of ownership.

My 335d showed improved mpg's (tracked every single fillup since new) and less wear on UOA's since doing the EGR delete, even though it takes much longer to warm up. And it rarely gets above 174F, unless very hot weather and running A/C, or doing multiple 1/4 mile passes in succession.

Some of the UOA's can be seen here: http://www.e90post.com/forums/showthread.php?t=1045534

I keep thinking about swapping the T-stat, but haven't measured a reason to fuss with it yet.
Sounds like I should drive more and worry less, maybe tackle t-stat next year?
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      10-14-2016, 06:31 AM   #21
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Rockauto $39 plus shipping
https://www.rockauto.com/en/moreinfo...443058&jsn=276
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      10-14-2016, 07:02 AM   #22
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I'm also seeing temperatures in the 76-80 Celsius range. Should I be concerned?
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