Best aftermarket oil thermostat solution for N54?

BOosted 335i

Sergeant
Jun 1, 2017
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I personally like the Mosselman thermostat. It's a 185 degree opening thermostat and the hose routing is much easier (OEM like) for a dual cooler setup compared to the Improved Racing one. Not cheap though. https://www.mosselmanturbo.com/en/msl-thermostat-n54
Think its better to have for example the ImprovRacing 205F.you want the oil to be 210-220 optimal to burn off the condensation buildup.Would be better for the n54
 

BOosted 335i

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IMO, if any question whether real or China fake ... order from an FTP dealer. Just be aware - because Amazon fulfills doesn't mean it is not fake. I have yet to have anyone at Amazon make a convincing argument that they know what they are using to fulfill. Their answer - "we warranty our product". Hardly the same thing.

Filippo
Yes even though Amazon is great,they cant control the fake products still being sold there.they can only warranty it.as they say you pay for what you get.but yes sometimes you can find a good product for cheap,it just depends what it is.
 

Rob09msport

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Look at their meth kits most say improve brake like lmao that's why I stuck to twisted tunings setup.
 

gmx

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I personally like the Mosselman thermostat. It's a 185 degree opening thermostat and the hose routing is much easier (OEM like) for a dual cooler setup compared to the Improved Racing one. Not cheap though. https://www.mosselmanturbo.com/en/msl-thermostat-n54

This is actually a thermostat. The rest, are not.

Think its better to have for example the ImprovRacing 205F.you want the oil to be 210-220 optimal to burn off the condensation buildup.Would be better for the n54

Mosselman is better for packaging especially dual coolers. If anyone wants my improved racing with 185F and the other thermostat (210?), I have one for sale. Never used. I run dual oil cores, packaging nightmare more than I'm bothered with.
 

houtan

Lieutenant
Nov 2, 2017
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Quick question when installing something like the FTP thermostat. Do I need to drain the oil or can that cover for the thermostat be removed and can The thermostat be replaced while the motor has oil in it?
 

The Convert

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Jun 4, 2017
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Quick question when installing something like the FTP thermostat. Do I need to drain the oil or can that cover for the thermostat be removed and can The thermostat be replaced while the motor has oil in it?
Oil sits in the oil pan. T stat is at the top of the block. I don’t recall if I had to drain the coolant or not though.
 
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nahor

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Sep 15, 2017
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Quick question when installing something like the FTP thermostat. Do I need to drain the oil or can that cover for the thermostat be removed and can The thermostat be replaced while the motor has oil in it?
No drainage required, oil or otherwise. There was a small amount of oil that dripped out when pulling the thermostat out though, but nothing major.
 
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Cabdriver

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Nov 3, 2019
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Been running the ftp for about 13k miles, that coupled with the mhd sport cooling strategy and 3k oil changes works wonders. Rarely exceed 220 but average between 205 and 215.
This one is best if you drive in cold weather since it allows proper warm up, just engages earlier.

 
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Asbjorn

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Mar 10, 2018
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Been running the ftp for about 13k miles, that coupled with the mhd sport cooling strategy and 3k oil changes works wonders. Rarely exceed 220 but average between 205 and 215.
This one is best if you drive in cold weather since it allows proper warm up, just engages earlier.


I ran this in 2018. Ended up going back to stock because oil wouldnt come above the boiling point for water when driving at highway speeds in freezing conditions.
 
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Jeffman

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Same here. It’s now chilly in the Northeast and with the FTP Tstat my oil temps easily stay in the 200-205 range during normal highway driving.
 

birrcrin

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Jul 26, 2018
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It opens at about 220F instead of 240F.

Are you able to verify it opens at 220 instead of keeping it open all the time like the BMS piece? I messaged a few of the ebay vendors and they all told me that the ftp thermostat just keeps the oil cooler open.
 
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Jeffman

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No idea. I suppose I could compare oil warm up times FTP vs BMS and infer what’s going on in the FTP. But no time for that.
 

turbohugh

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Nov 13, 2018
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HardMotorsports low-temp Oil thermostat.

Cools oil
works as advertised. Pics were taken after a 1 hour drive mixed highway and city.
 

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George@GPerformance

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May 17, 2020
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In case of someone interested we also have a stock oil thermostat delete plate in stock. More info in our instagram: _gperformance.
By the way now we designing an upgraded oil thermostat for N54/N55/S55. What t do you want it to be full open?
photo_2020-04-25_23-25-47.jpgIMG_1355.jpg
 

typedRew

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martymil

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Sep 6, 2017
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I run a stock thermostat at the factory preset and I just pulled my built motor down for a full inspection, there is absolutely no damage or wear what so ever.

As many think running hotter oil is detrimental to performance its not always the case, i would like to see an adjustable thermostat which can be adjusted to be fully open between 210f and 230f or if not to be fully open by 220f
 
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houtan

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Nov 2, 2017
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In case of someone interested we also have a stock oil thermostat delete plate in stock. More info in our instagram: _gperformance.
By the way now we designing an upgraded oil thermostat for N54/N55/S55. What t do you want it to be full open?

very cool. There are many seasoned experts on here that would know what oil temp would be best. From what I understand, the stock thermostat temp is fine. I personally have a ftp low temp thermostat installed which has been fine in So Cal. Tbh, the main reason I installed it was for a track day. My hope was for the lower opening temp to give me a little more head room before my oil got too hot. And you know what, it worked!

But I would really like to address the main issue, which is a larger oil cooler to replace the stock unit. Problem is I don’t have time to fab one up and the prices for the ones available are high in my opinion it don’t have basic features like vibration dampening.

Are you guys planning to come up with an entire solution with an oil cooler as well? Something that
 

gmagnus7

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Dec 3, 2018
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From what I understand, the stock thermostat temp is fine.
Pretty sure I read somewhere that the stock oil thermostat opens at 230F/110C, fully open at 260F. That's pretty high. For a DD it doesn't really too much but for highly modded cars and/or people that track them it opens about 20-30 degrees to late. That's why I bought the Mosselman thermostat since it starts to open at 185F and says it'll stabilize between 200-220F. Which is perfect - I'm expecting it to hover around 200-210F with my planned dual oil coolers.
 

Asbjorn

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Mar 10, 2018
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Pretty sure I read somewhere that the stock oil thermostat opens at 230F/110C, fully open at 260F. That's pretty high. For a DD it doesn't really too much but for highly modded cars and/or people that track them it opens about 20-30 degrees to late. That's why I bought the Mosselman thermostat since it starts to open at 185F and says it'll stabilize between 200-220F. Which is perfect - I'm expecting it to hover around 200-210F with my planned dual oil coolers.

I can see a problem with 200F oil as moist isn't burned off over time?
I don't see the problem with 230-260F oil. This is oil temp measured in the oil sump remember. I mean sure, a thermostat that fully opens from 220F-230F would be better, but why 185F?
I do see a problem with coolant exceeding 212F when the DME is trying to target 176F though... This is again why I suggest focusing on adding aux radiators rather than oil stuff.

Here's a log from last weekend. Did a 20min session on a semi-wet track in 85F humid heat. I was a bit annoyed coolant got so hot (223F) considering I was barely pushing. The DME was clearly trying to target 176F, as was finally achieved at the end of the cool down lap. Oil temps on the other hand were low enough (max 270F or so) that I didn't even care to turn on the second oil cooler on my car. WI and external water spray was both turned off. AC was also on, which never helps coolant. As most of you know I run two large aux radiators, one on the side, one behind fmic.

 
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