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Old 07-01-2022, 02:45 AM   #1
TriniPhantom
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Default Controlling oil and coolant temps on 2016 WRX

I recently took my 2016 WRX to Sonoma Raceway for a track day event. The day got pretty warm, but not blisteringly hot. I logged some data using my Cobb Accessport. After looking through the numbers I found the coolant temp reached a max of 205F and oil temp reached a max of 250F, which is right at that upper limit. I plan to track this car often. I have another car for my daily. As such I concerned that during the hot days of the summer, these temps can become dangerously high at the track. Here is my plan for controlling these temps:

Build list to handle coolant temps:

Build list to handle oil temps:
Here are my questions:
  1. Any thoughts on this build list?
  2. Do any of you have experience with these parts and can speak to their performance, reliability and build quality? In particular I am interested in what you have to say about the oil cooler and thermostat.
  3. Should I go with OEM Subaru Coolant or something aftermarket eg Mishimoto liquid chill?
Any advice appreciated. Thanks.
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Old 07-01-2022, 08:29 AM   #2
rtv900
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I'm sure you'll get plenty of responses about how you need to turn the car upside down to "mitigate" those temps, but IMO you are wasting your time.
205 water isn't even close to excessive nor is 250 degree oil
you want to replace all that stuff so what, you can run 10 degrees cooler?

You should save the thousands of dollars and put a 40 weight oil in for tracking, done.
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Old 07-01-2022, 08:29 AM   #3
rtv900
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I'm sure you'll get plenty of responses about how you need to turn the car upside down to "mitigate" those temps, but IMO you are wasting your time.
205 water isn't even close to excessive nor is 250 degree oil
you want to replace all that stuff so what, you can run 10 degrees cooler?

You should save the thousands of dollars and put a 40 weight oil in for tracking, done.
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Old 07-01-2022, 09:51 AM   #4
Elbert Bass
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RTV900 is correct.
FYI: the radiator fans on a 2016 turn on low speed at about 208 degrees and high speed at 214 degrees (unless the A/C is on) That is why having a the proper radiator cap is important - the cooling system needs to be able to reach 16 PSI on later models to operate safely in that range.
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Old 07-01-2022, 02:06 PM   #5
TriniPhantom
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Quote:
Originally Posted by Elbert Bass View Post
RTV900 is correct.
FYI: the radiator fans on a 2016 turn on low speed at about 208 degrees and high speed at 214 degrees (unless the A/C is on) That is why having a the proper radiator cap is important - the cooling system needs to be able to reach 16 PSI on later models to operate safely in that range.
My logged data shows the primary fan turned on at 194F.
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Old 07-01-2022, 02:12 PM   #6
TriniPhantom
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Quote:
Originally Posted by rtv900 View Post
I'm sure you'll get plenty of responses about how you need to turn the car upside down to "mitigate" those temps, but IMO you are wasting your time.
205 water isn't even close to excessive nor is 250 degree oil
you want to replace all that stuff so what, you can run 10 degrees cooler?

You should save the thousands of dollars and put a 40 weight oil in for tracking, done.
Ok, so what are considering excessive temps? And especially for the higher temps during track use, how long should those temps be sustained for? If these temps are just spikes which are corrected then I'll feel comfortable. But if these temps are sustained for a long while on track, I am concerned that it can reduce the life of the engine. I will do some plots from my data and post them here later. Fwiw, there are other forum posts where temps drop 20-30 degrees with some of these mods.
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Old 07-01-2022, 02:18 PM   #7
KillerBMotorsport
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I wouldn't change a thing on the coolant side, those temps are great. You're marginal on the oil temp, but if you go remote cooler, get the highest temp you can, to prevent overcooling.

Definitely NO on the mishy thermostat. That would be a step backwards.
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Old 07-01-2022, 02:18 PM   #8
KillerBMotorsport
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I wouldn't change a thing on the coolant side, those temps are great. You're marginal on the oil temp, but if you go remote cooler, get the highest temp you can, to prevent overcooling.

Definitely NO on the mishy thermostat. That would be a step backwards.
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Old 07-01-2022, 02:21 PM   #9
TriniPhantom
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Quote:
Originally Posted by KillerBMotorsport View Post
I wouldn't change a thing on the coolant side, those temps are great. You're marginal on the oil temp, but if you go remote cooler, get the highest temp you can, to prevent overcooling.

Definitely NO on the mishy thermostat. That would be a step backwards.
Pretty cool that KillerBMotorsports responds to my post . Btw I am also getting the Killer B Motorsport Coolant Breather Fitting Assembly so that I'll avoid that problem in the future. Can you explain why the Mishimoto thermostat is step backwards?
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Old 07-01-2022, 02:26 PM   #10
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Quote:
Originally Posted by KillerBMotorsport View Post
I wouldn't change a thing on the coolant side, those temps are great. You're marginal on the oil temp, but if you go remote cooler, get the highest temp you can, to prevent overcooling.

Definitely NO on the mishy thermostat. That would be a step backwards.
Pretty cool that KillerBMotorsports responds to my post . Btw I am also getting the Killer B Motorsport Coolant Breather Fitting Assembly so that I'll avoid that problem in the future. Can you explain why the Mishimoto thermostat is step backwards?
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Old 07-01-2022, 02:36 PM   #11
rtv900
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Quote:
Originally Posted by TriniPhantom View Post
Ok, so what are considering excessive temps? And especially for the higher temps during track use, how long should those temps be sustained for? If these temps are just spikes which are corrected then I'll feel comfortable. But if these temps are sustained for a long while on track, I am concerned that it can reduce the life of the engine. I will do some plots from my data and post them here later. Fwiw, there are other forum posts where temps drop 20-30 degrees with some of these mods.
230+ on coolant and 285+ on oil is where I'd say you are getting into trouble territory.
your 205 and 250 are totally fine sustained. Modern cars basically run right around 205 on the street and oil is 200-210 with normal street driving, so 250 on a track is nowhere close to excessive

And a 20-30 degree drop??????
That would get you down to the point of needing to complete a warm up

You're basically dead on ideal temps

Plus, worrying about reducing the life of the engine and then taking that vehicle to a track is kind of setting yourself up. There's no harsher operating than on a track, so if you are doing that then yes, you are reducing the life of that engine and it sure as hell ain't because of your temps.
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Old 07-01-2022, 03:25 PM   #12
TriniPhantom
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Quote:
Originally Posted by rtv900 View Post

Plus, worrying about reducing the life of the engine and then taking that vehicle to a track is kind of setting yourself up. There's no harsher operating than on a track, so if you are doing that then yes, you are reducing the life of that engine and it sure as hell ain't because of your temps.
Touche on that lol. Guess I can't have my cake and eat it too. Thanks for your insight.
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Old 07-02-2022, 08:38 PM   #13
KillerBMotorsport
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Quote:
Originally Posted by TriniPhantom View Post
Pretty cool that KillerBMotorsports responds to my post . Btw I am also getting the Killer B Motorsport Coolant Breather Fitting Assembly so that I'll avoid that problem in the future. Can you explain why the Mishimoto thermostat is step backwards?
No problem and thanks for using our products!

The mishy thermostat opens at a colder temperature, below ideal operating conditions. Ideally, you want temps as precisely controlled as possible, which the OEM thermostat does very well. The higher your temps are above ambient, the easier it is to control the temps. This is one of the reasons why nascar and F1 run 300 degree coolant temps, it gives them a hug bump in efficiency and control, because that temperature is significantly higher than ambient.
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Old 07-03-2022, 01:53 AM   #14
TriniPhantom
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Quote:
Originally Posted by KillerBMotorsport View Post
No problem and thanks for using our products!

The mishy thermostat opens at a colder temperature, below ideal operating conditions. Ideally, you want temps as precisely controlled as possible, which the OEM thermostat does very well. The higher your temps are above ambient, the easier it is to control the temps. This is one of the reasons why nascar and F1 run 300 degree coolant temps, it gives them a hug bump in efficiency and control, because that temperature is significantly higher than ambient.
That makes sense. Thanks for the advice! I think I'll be going for the Perrin oil cooler. It has a built in thermostat which opens at 85C. I've been reading about too much quality control issues with the Mishi, so all their products are out from my build list. It would be awesome for KillerB to make an oil cooler. *hint hint*
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Old 07-06-2022, 04:20 PM   #15
KillerBMotorsport
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Quote:
Originally Posted by TriniPhantom View Post
That makes sense. Thanks for the advice! I think I'll be going for the Perrin oil cooler. It has a built in thermostat which opens at 85C. I've been reading about too much quality control issues with the Mishi, so all their products are out from my build list. It would be awesome for KillerB to make an oil cooler. *hint hint*
We've been asked this a lot over the years, but the fact of the matter is that most kits are pieced together with off-the-shelf parts (that's what we do). So whenever we're asked, we recommend using good quality parts (Mocal or Setrab) and making your own 'kit' to suit your needs
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