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Old 05-23-2022, 09:49 AM   #1
TitoBandito
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Member#: 318302
Join Date: Apr 2012
Location: CT
Vehicle:
2004 Sti
WRB

Default High oil temps at track day result of sensor location?

Did a forum search first, and could not find an exact answer in existing posts.

I installed my oil temperature sensor into the galley plug on top of the engine near cylinder #3 several years ago, after doing a lot of research on NASIOC, I somehow came to the conclusion back then that this was the best spot for me instead of the oil pan (I guess I really wanted to know the oil temp at maximum, while coursing through the engine). I did my first track day on a full track after running it at several short/autocross tracks previously. After 2-3 laps, the oil temperature was reaching 235-240*F and so I would back off and run one gear higher for lower RPMs and not get into full boost as much, and that would keep it at 225*F.
Normal everyday city and highway driving is 190-205*F depending on ambient temperature, including the occasional spirited drive. Because I've located the temp sensor near the cylinder closest to the turbocharger, am I getting skewed readings due to heat soaking effect from the turbo? The coolant temperature never climbs above the mid-point, there's no coolant issues at all.
Not that this is directly related -- but after the track day I removed my TMIC and there was no oil blow by in the intercooler coupling or throttle body. I used to always have a slight wetting of oil in there. As I was checking if that condition had gotten any worse.

Background info:
Car: 2004 STi, lightly modified.
Oil system: OEM STi coolant-to-oil heater/cooler. No AOS or catch can. Oil temp sensor near cylinder #3, oil pressure sensor replacing OEM 'dummy light' sensor. KillerB oil pan baffle. Oil level was checked before/after runs, remained at full level for duration of track day. Oil is Shell Rotella T6 5w40.
Ambient conditions: 60*F, moderate humidity.
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Old 05-23-2022, 09:55 AM   #2
TitoBandito
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Member#: 318302
Join Date: Apr 2012
Location: CT
Vehicle:
2004 Sti
WRB

Default

Also, I should have noted that since I reduced the power I was demanding on the car, I don't know if the oil temperature would have climbed higher. I suspect so, and that it would have peaked a little higher. But even if it did not increase, I don't think that running the car at 240*F+ for 20 minutes would have been good for the EJ257 at all.
So before I buy an external oil cooler I wanted to see if there was anything to my thought that the location of the sensor is part of my problem and perhaps a reading from the oil pan would have been a slight amount lower, at least enough for me to not worry?
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Old 05-23-2022, 12:13 PM   #3
KillerBMotorsport
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Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

Default

Relocating to the sump may change the temp some, but not a lot.

240* isn't too high if you're running good quality oil. 250 is when you start to keep a close eye and 260* is time to ease up.

If you're only doing occasional track days, adding a high-capacity sump would knock temps down a bit, and provide additional oil supply insurance for those conditions. I hear Killer B makes a couple versions
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Old 05-23-2022, 12:14 PM   #4
KillerBMotorsport
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Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

Default

Relocating to the sump may change the temp some, but not a lot.

240* isn't too high if you're running good quality oil. 250 is when you start to keep a close eye and 260* is time to ease up.

If you're only doing occasional track days, adding a high-capacity sump would knock temps down a bit, and provide additional oil supply insurance for those conditions. I hear Killer B makes a couple versions
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Old 05-25-2022, 10:07 AM   #5
TitoBandito
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Member#: 318302
Join Date: Apr 2012
Location: CT
Vehicle:
2004 Sti
WRB

Default

Won't have to twist my arm too much to get the oil pan, KillerB, I've had it in the potential parts list in my head for a few years.
Compared to an external oil cooler, which I originally thought would be the corrective action if the sensor location wasn't at fault, I like the oil pan better as the oil cooler would have created several new potential points of failure for leakage. When I buy and install the new oil pan, I would like to leave the sensor in its current location just to see what the quantitative effect is.
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