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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 Thu, Sep-14-2017, 07:51:04 PM   #11
bigjae1976
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Default Re: S54 stubbornly high oil temps, thoughts?

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Originally Posted by MasterC17 View Post
I found that my AIM Pista interpreted coolant and oil temperatures consistently about 5-10% higher than the actual temp.



Maybe that's the only issue you are having?


Actual temp compared to an aftermarket oil temp sender on the oil pan?


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Old Thu, Sep-14-2017, 08:29:48 PM   #12
MasterC17
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Default Re: S54 stubbornly high oil temps, thoughts?

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Originally Posted by bigjae1976 View Post
Actual temp compared to an aftermarket oil temp sender on the oil pan?


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The AIM Pista takes the signal from the factory sending unit and converts the signal into a temperature. What is interesting is the temperature the AIM displays and the temperature the stock instrument cluster displays are quite a bit different. This would lead me to believe my car was overheating when in fact it was not.
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Old Thu, Sep-14-2017, 08:53:13 PM   #13
Bimmerman325i
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Default Re: S54 stubbornly high oil temps, thoughts?

It's definitely possible that sensor calibration is a factor. I don't have a factory gauge to compare with, but comparing my Canbus data and cooler exit-mounted sensor data to others with the same setup shows I have a much narrower delta between the sensing locations. My water gauge sensor (in water pipe) is within 2 degrees of the reported Canbus data (the sensors are about an inch apart, so this is good!), so my inclination is to believe the gauge and the canbus are reading correctly. Both gauges are Stack Pro-Control units.

That said, I am tempted to pull the gauge sensor, pull out a coleman stove, and boil a pot of water right next to the car with the sensor measuring water temp. If it doesn't show ~212F then the sensor's reading wrong.

I'm much less worried about the ~275-280F avg oil pan temps (per canbus) than I am the ~265-270F avg oil cooler exit temps (gauge). The fact there's very little delta between the average value of the two measurements, when you disregard oil temp spikes up to 290/300, suggests to me that either the cooler isn't cooling, the thermostat is barely allowing oil to flow (though, I have confirmed it has non-zero flow), or the gauge(s) is/are reading wrong. Hopefully the latter, as the others are a lot harder to verify and solve.

Any ideas on how to check whether the thermostat is flowing the proper amount of oil to the cooler?
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Last edited by Bimmerman325i; Thu, Sep-14-2017 at 08:59:15 PM.
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Old Wed, Sep-20-2017, 02:53:21 PM   #14
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Default Re: S54 stubbornly high oil temps, thoughts?

Subscribed for more ideas/info my car suffers the same high oil temps after 2-3 laps while others are able to run whole sessions.

Although I know the supercharger does't help in my case either but I'm thinking I'll have to add an auxiliary oil cooler in a non stock location for track use.
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Old Wed, Nov-08-2017, 07:46:18 PM   #15
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Default Re: S54 stubbornly high oil temps, thoughts?

My 2p. I have just completed an S54 swap in my (now) Nasa ST-2 E36.

First test day I got ONE lap in at Autoclub Speedway and was hitting 270F in 90 ambient....not good. I know the S54 runs high but I religiously want to keep my oil temps below 250, 260 absolute tops.

No matter how much air routing I was going to do, it clearly wasn't going to work. My previous oil cooler was mounted up high right behind the kidney grills with stock shroud guiding the air through the cooler and rad. It was 9" x 7", Setrab

I switch to a 18" x 9.5" Setrab Cooler that is almost as big as the Radiator itself, but I have plenty of coolant capacity to spare so was not concerned with Water Temps.

I just completed a test day at Big Willow last week in a unusually very 70F ambient. Did not see Oil Temps above 225F. I imagine under "usual" SoCal conditions (90-105 ambient) I will be right on the money at around 240-250 hot.

It is worth noting I have a diverter valve in my housing.

Pic showing how large the new cooler is...



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Old Wed, Nov-08-2017, 08:51:46 PM   #16
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Default Re: S54 stubbornly high oil temps, thoughts?

Interesting, I have a feeling a bigger oil cooler is going to be my next / last step. Your cooler is HUGE!

Since my last post I've done a few things-- confirmed my gauge sensor is reading correctly (hot plate + thermometer + beaker o' oil), confirmed there are no blockages within the cooler, lines, and OFH, and just yesterday, installed the oil diverter delete kit.

I've got an HPDE this upcoming weekend so I'll get some more data with the ODV delete. Temps are looking to be 65F instead of 100F, so I'm hoping for temps around 220-230 hot since I doubt the oil will get summer-hot.
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Old Wed, Nov-08-2017, 09:03:49 PM   #17
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Default Re: S54 stubbornly high oil temps, thoughts?

Sounds good, let us know how you got on!

Lots of people run their S54's at 270F and higher, I just always want my oil below 250....
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Old Wed, Nov-08-2017, 09:06:44 PM   #18
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Default Re: S54 stubbornly high oil temps, thoughts?

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Sounds good, let us know how you got on!

Lots of people run their S54's at 270F and higher, I just always want my oil below 250....
Will do!

I'd be happy with pan temps in the 270F range. I'm seeing 270F at the oil cooler output-- that's what I'd loooove to reduce a bit down into the 250F range.
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Old Wed, Nov-08-2017, 09:26:07 PM   #19
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Default Re: S54 stubbornly high oil temps, thoughts?

i see 280-290 regularly during a race, i however am on a stock cooler. i havent switched to somehting aftermarket because im finding exactly what you are seeing, everyone i know with a cr cooler are running at teh same temps i am. so to me i see no point. in a draft i can see as high as 300.

i do change the oil every race weekend with redline. i will be doing rod bearings this winter and see if there is any extra wear on them but i suspect not. ive run the whole season this way
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Old Wed, Nov-08-2017, 09:30:20 PM   #20
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Default Re: S54 stubbornly high oil temps, thoughts?

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Originally Posted by f.millan View Post
i see 280-290 regularly during a race, i however am on a stock cooler. i havent switched to somehting aftermarket because im finding exactly what you are seeing, everyone i know with a cr cooler are running at teh same temps i am. so to me i see no point. in a draft i can see as high as 300.

i do change the oil every race weekend with redline. i will be doing rod bearings this winter and see if there is any extra wear on them but i suspect not. ive run the whole season this way
Stock/factory oil temp gauge readings?
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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)