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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Oil Temperatures, Stock Oil Thermostat replacement?!?



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      07-16-2011, 10:55 PM   #1
blaknite7
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Exclamation Oil Temperatures, Stock Oil Thermostat replacement?!?

The Short story:
Has anyone modified, or does anyone sell a modified oil thermostat for the N54 motor without buying a full blow oil upgrade kit/core combo?


The Long Story:

I’m trying to find a way to lower my oil temperatures during normal driving conditions. Through doing some research I’ve found out that the stock T-Stat fully opens at around 250°F and that temps of 230-260 are somewhat normal for the N54 motor… Now, at first I was looking at upgrading the oil cooler but that does nothing for me unless the kit upgrades the T-Stat as well.

So far the only one that I have seen that does this is the STETT oil upgrade kit. Now this looks like a good kit for someone who does track days but spending $1K to get the kit and all weekend installing it seems like overkill for the "average joe" drivers…

I guess my question is; does anyone sell some sort of a modified T-Stat for the N54 motor? From what I have gather the T-Stat is just a spring/piston combo that opens and closes past two perpendicular holes… is there a way to machine the piston so that t-stat remains slightly open under lower temps and is essentially completely open at a lower-higher temp? I live in Arizona so simply by looking at a car it brings the oil temps up to 250°F. Really curious if anyone has done a simple/cheap modification of this sort.
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      07-16-2011, 11:03 PM   #2
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You can eliminate the oil cooler thermostat an d you will see 5 to 15 degrees lower, I told this to a friend and is no a big different but it helped.
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      07-16-2011, 11:07 PM   #3
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How does that change the warm up time? By eliminating the T-Stat completely the oil will always pass through the cooler. In the winter time does it take much longer to heat up?
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      07-16-2011, 11:13 PM   #4
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http://www.e90post.com/forums/showthread.php?t=541538

He is the one that did it.

Im not sure, we don't have winter in the Caribbean but I know somebody modify the spring to open sooner
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      07-16-2011, 11:13 PM   #5
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you live in AZ so temps are pretty warm , just take the t-stat out
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      07-17-2011, 02:25 AM   #6
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I guess im more worried about the winter time, it can get pretty chilly here in the winters. Someone mentioned a different spring in the stock housing to change when the T-Stat opens.... has anyone done this?
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      07-17-2011, 02:29 AM   #7
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I live somewhere where it never gets cold

anyone have any info on how to do a thermostat delete for the N54?
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      07-17-2011, 04:08 AM   #8
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Quote:
Originally Posted by blaknite7 View Post
The Short story:
Has anyone modified, or does anyone sell a modified oil thermostat for the N54 motor without buying a full blow oil upgrade kit/core combo?


The Long Story:

I’m trying to find a way to lower my oil temperatures during normal driving conditions. Through doing some research I’ve found out that the stock T-Stat fully opens at around 250°F and that temps of 230-260 are somewhat normal for the N54 motor… Now, at first I was looking at upgrading the oil cooler but that does nothing for me unless the kit upgrades the T-Stat as well.

So far the only one that I have seen that does this is the STETT oil upgrade kit. Now this looks like a good kit for someone who does track days but spending $1K to get the kit and all weekend installing it seems like overkill for the "average joe" drivers…

I guess my question is; does anyone sell some sort of a modified T-Stat for the N54 motor? From what I have gather the T-Stat is just a spring/piston combo that opens and closes past two perpendicular holes… is there a way to machine the piston so that t-stat remains slightly open under lower temps and is essentially completely open at a lower-higher temp? I live in Arizona so simply by looking at a car it brings the oil temps up to 250°F. Really curious if anyone has done a simple/cheap modification of this sort.
What is the problem that you are facing? As you said the car is actually designed to run with the warmer temps. In case the OC is too small to keep the temps at the level designed and managed by the thermostat, the problem is the OC capacity.
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      07-17-2011, 06:52 AM   #9
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I imagine that if we bought identically sized springs with a lower spring rate that would effectively lower the opening temperature. I'll bet mcmaster.com would sell the springs. We'd just have to find out how to measure the spring strength. I'd be willing to bet that we'd have far fewer temp related limps if the thing would open at 200 instead of 240-250.
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      07-17-2011, 09:51 AM   #10
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http://www.e90post.com/forums/showth...=482959&page=7

http://www.e90post.com/forums/showpost.php?p=8434488
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      07-17-2011, 04:21 PM   #11
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Quote:
Originally Posted by jippii ensio View Post
Quote:
Originally Posted by blaknite7 View Post
The Short story:
Has anyone modified, or does anyone sell a modified oil thermostat for the N54 motor without buying a full blow oil upgrade kit/core combo?


The Long Story:

I’m trying to find a way to lower my oil temperatures during normal driving conditions. Through doing some research I’ve found out that the stock T-Stat fully opens at around 250°F and that temps of 230-260 are somewhat normal for the N54 motor… Now, at first I was looking at upgrading the oil cooler but that does nothing for me unless the kit upgrades the T-Stat as well.

So far the only one that I have seen that does this is the STETT oil upgrade kit. Now this looks like a good kit for someone who does track days but spending $1K to get the kit and all weekend installing it seems like overkill for the "average joe" driversÂ…

I guess my question is; does anyone sell some sort of a modified T-Stat for the N54 motor? From what I have gather the T-Stat is just a spring/piston combo that opens and closes past two perpendicular holes… is there a way to machine the piston so that t-stat remains slightly open under lower temps and is essentially completely open at a lower-higher temp? I live in Arizona so simply by looking at a car it brings the oil temps up to 250°F. Really curious if anyone has done a simple/cheap modification of this sort.
What is the problem that you are facing? As you said the car is actually designed to run with the warmer temps. In case the OC is too small to keep the temps at the level designed and managed by the thermostat, the problem is the OC capacity.
I want the oil temps to be lower why driving normally. My issue is that the oil temps hover around 250 and when I get on it the temps spike very quickly. With the JB4 the chip turns off at 270. So it only gives me 20 degrees of leeway before the chip turns off. If the oil temps started at 210 or so it would give me a little bit more time to have fun on the road. I don't do crazy track sessions but just little stints causes the temperature to exceed the JB4 operating temp.
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      07-17-2011, 04:36 PM   #12
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Currently there is no aftermarket thermostat replacement other than the STETT kit. Your best bet is STETT OC stage 1.

Have you thought about the additional radiator from the performance package? Parts only cost $375 from www.getbmwparts.com, then get a shop to install it for $100-200. You might think that this radiator won't do much, but it runs full-time no thermostat involved.. Might be worth a shot.

http://www.e90post.com/forums/showth...1273&highlight

Last edited by JunkStory; 07-17-2011 at 04:44 PM.
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      07-17-2011, 07:13 PM   #13
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Quote:
Originally Posted by blaknite7 View Post
I want the oil temps to be lower why driving normally. My issue is that the oil temps hover around 250 and when I get on it the temps spike very quickly. With the JB4 the chip turns off at 270. So it only gives me 20 degrees of leeway before the chip turns off. If the oil temps started at 210 or so it would give me a little bit more time to have fun on the road. I don't do crazy track sessions but just little stints causes the temperature to exceed the JB4 operating temp.
The OEM thermostat opens at 230F, and is fully opened at 260F. A good way for you to have lower oil temps is to simply run a 30/70 coolant to water mixture. Then add in 2 full bottles of any watter wetter product you can find. You can keep your coolant at 30%, because you live in AZ, so no danger of freezing temps.
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      07-17-2011, 07:40 PM   #14
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Quote:
Originally Posted by WilliamE92 View Post
I live somewhere where it never gets cold

anyone have any info on how to do a thermostat delete for the N54?
here is the link to my DIY oil cooler upgrade it tells you how to take the t-stat out !!

http://www.e90post.com/forums/showthread.php?t=464276
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      07-21-2011, 08:17 AM   #15
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I found this link in a 335 page from Taiwan it is and aftermarket Oil Cooler Thermostat, using Google translator it says it can lower your temp by 10 degrees.

http://tw.page.bid.yahoo.com/tw/show...8942193692&tp=
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      07-21-2011, 11:19 AM   #16
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Shoot us a PM for some pricing options...we always offer discounts for forum members!
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      07-21-2011, 02:22 PM   #17
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Quote:
Originally Posted by taylors335 View Post
here is the link to my DIY oil cooler upgrade it tells you how to take the t-stat out !!

http://www.e90post.com/forums/showthread.php?t=464276
Thanks!

Looks simple enough.
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      12-20-2011, 02:50 PM   #18
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man, i am looking for exactly this. it only seems that you can buy either a complete bypass or an uprated oil cooler.

i too would like a thermostat that opens at about 20% lower temps than stock.

did anybody ever find a solution?
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      12-20-2011, 03:00 PM   #19
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A bigger cooler is the solution. The oil temp sensor is in the pan - the hottest point. Oil temps going back into the block need to be around 220-230F for best oil life and power. Hot oil, cool water. A lower temp thermostat is only going to lower oil temps until the cooler is saturated and can't shed any more heat - which is pretty much after a couple of hard laps on a road course. For the street or drag strip, you do not need any oil cooing upgrades.
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      12-20-2011, 03:04 PM   #20
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Do NOT remove the thermostat. The thermostat serves as a mechanical barrier between the the high and low pressure sides in the oil filter housing. If you remove the oil thermostat, you will loose the pressure differential in the oil cooler and thus no oil will flow through the oil cooler at all.
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      03-13-2012, 09:11 PM   #21
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+1


Quote:
Originally Posted by JamesM3M5 View Post
A bigger cooler is the solution. The oil temp sensor is in the pan - the hottest point. Oil temps going back into the block need to be around 220-230F for best oil life and power. Hot oil, cool water. A lower temp thermostat is only going to lower oil temps until the cooler is saturated and can't shed any more heat - which is pretty much after a couple of hard laps on a road course. For the street or drag strip, you do not need any oil cooing upgrades.
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      03-13-2012, 09:12 PM   #22
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complete opposite, oil will run through oc all the time.



Quote:
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Do NOT remove the thermostat. The thermostat serves as a mechanical barrier between the the high and low pressure sides in the oil filter housing. If you remove the oil thermostat, you will loose the pressure differential in the oil cooler and thus no oil will flow through the oil cooler at all.
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