Engine operating Temperatures???

Q&A regarding engines, turbos, and intercoolers and power upgrades

Engine operating Temperatures???

Postby mickeyfinn » Tue Sep 22, 2020 3:55 pm

Can anyone please let me know what some typical engine operating temperatures they are seeing in an ST165?

I know these Celica ST165 engine bays run pretty hot. I'm wondering how mine compare to others?

For example, driving to work this morning, full operating temp after 15 minutes, grandma driving, shifting at 3,500 rpm, little boost (My ST165):

Outside Temp = 66 degrees F

Engine Coolant Temp = 185 F
Ambient Air (Inside airbox) = 93 F
Intake Air Temp = 127 F
Charge Temp = 165 F
Intercooler water temp = 68 F

Are these normal?
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Re: Engine operating Temperatures???

Postby dbucks2k » Wed Sep 23, 2020 2:25 am

I get similar temps. Granted I have a 4th gen swap with the top mount air to air intercooler. And my fans run all the time. But at ambient of 66F my engine runs between 185-190. Intake temps around around 130.
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Re: Engine operating Temperatures???

Postby mickeyfinn » Wed Sep 23, 2020 2:28 am

Thank you for that info. I appreciate it!
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Re: Engine operating Temperatures???

Postby abeans » Wed Sep 23, 2020 3:43 am

is your filter open element in the engine bay?
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Re: Engine operating Temperatures???

Postby mickeyfinn » Wed Sep 23, 2020 12:06 pm

No, stock airbox.
But I did add an additional 1.25" fresh air duct that channels air from the grill in to the factory airbox.

Ram Air vent.jpg
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Re: Engine operating Temperatures???

Postby mickeyfinn » Wed Sep 23, 2020 12:09 pm

Driving yesterday mid-afternoon, I had these temps:

Outside Temp = 83 degrees F

Engine Coolant Temp = 190 F
Ambient Air (Inside airbox) = 129 F
Intake Air Temp = 144 F
Charge Temp = 165 F
Intercooler water temp = 90 F
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Re: Engine operating Temperatures???

Postby RedCelicaTRD » Wed Sep 23, 2020 8:12 pm

Where are you measuring intercooler water temp and is your pump set to run constant?
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Re: Engine operating Temperatures???

Postby mickeyfinn » Wed Sep 23, 2020 8:53 pm

Yes, Intercooler pump is running constantly.
IC water temp measured at bottom of the IC radiator. (12” x 12” x 2”).
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Re: Engine operating Temperatures???

Postby dbucks2k » Thu Sep 24, 2020 12:16 am

You can wrap your intercooler in heat foil to help reduce heat soak from the engine bay. But your intercooler water temps will never be below ambient air. So being 83 outside and having 90 intercooler water temps are pretty good. But with how small the st165 intercooler is it can only take out so much heat.
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Re: Engine operating Temperatures???

Postby mickeyfinn » Thu Sep 24, 2020 1:24 am

I did wrap the Intercooler with 2 layers of heat shielding.
Also added “water wetter” to the IC coolant.

What’s puzzling is I’m driving grandma with almost no boost. So the intake air is jus regular under hood conditions.
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