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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Tue, Nov-14-2017, 10:44:31 PM   #31
TheGenius46M
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Default Re: S54 stubbornly high oil temps, thoughts?

Anyone running an in-line thermostat with the diverter valve and happen to have AN line dimensions to mate to the factory oil cooler? Looking to do this soon. Thanks
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Old Tue, Nov-14-2017, 11:09:06 PM   #32
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Default Re: S54 stubbornly high oil temps, thoughts?

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Originally Posted by TheGenius46M View Post
Anyone running an in-line thermostat with the diverter valve and happen to have AN line dimensions to mate to the factory oil cooler? Looking to do this soon. Thanks

I posted this in a different thread. I used the standard AN line adaptor and this thermostat...

https://rover.ebay.com/rover/0/0/0?m...2F122275115738

I used -10 lines.


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Old Wed, Nov-15-2017, 03:53:20 PM   #33
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Default Re: S54 stubbornly high oil temps, thoughts?

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Originally Posted by m3elmo View Post
hood venting, especially the center one will help a lot with temps.
And will reduce high speed drag.
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Old Tue, Nov-21-2017, 12:15:20 PM   #34
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Default Re: S54 stubbornly high oil temps, thoughts?

Subscribed to see if there are any updates, I've had a similar issue with my E36, albeit with S50B30 (Japan-market S50B30 with OEM everything on the engine + CSR radiator, track days at Bahrain International Circuit). Oil temps within just a few laps get to 140*C (284*F). Either the factory oil cooler just doesn't get enough airflow down there below the radiator even with the duct, or the diverter valve claims are true (i.e. the oil thermostat just doesn't flow enough even when open). I'm installing the diverter valve this week before the track day on Friday, hopefully there will be an oil temp difference!
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Old Tue, Nov-21-2017, 06:37:34 PM   #35
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Default Re: S54 stubbornly high oil temps, thoughts?

I'm curious how yours will do in that heat. My experiment is only a partial success since the ambient conditions were way cooler after installing better ducting and the diverter valve.

I have a feeling you'll notice slightly lower temps. Your oil cooler may not be sufficient enough though. While it won't fit in the nice duct, I've heard nothing but good things about the Zionsville S54/Z3 oil cooler kit from local E36+S54 racers. It's deeper than the factory cooler and ~twice as high, so you get a lot more cooling surface area and capacity. I'm tempted to try it next if this current approach isn't enough.

Please report back!
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Old Wed, Nov-22-2017, 05:38:23 PM   #36
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Default Re: S54 stubbornly high oil temps, thoughts?

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Originally Posted by nholmes View Post
Awesome, dude!

Pics of the new duct work?
Took me a bit to upload photos.

OE Euro Oil cooler duct, totally-not-taped to the bumper



Totally not speed taped to the radiator shrouding either


You can sorta see it in the lower half of the lower grill opening


Hard to tell, but it completely seals to the oil cooler. Stock US AC and AUX fan will NOT fit.

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Old Wed, Nov-22-2017, 05:39:45 PM   #37
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Default Re: S54 stubbornly high oil temps, thoughts?

Damn. Serious business.
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Old Wed, Nov-22-2017, 05:40:39 PM   #38
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Default Re: S54 stubbornly high oil temps, thoughts?

Srs bsns bcuz razekar
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Discussing S54 stubbornly high oil temps, thoughts? in the M3 Track: Racing and DE Forum - Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)