Turbo Coolant Question - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

James Russels · 07-10-2019, 05:26 AM

For turbos that have coolant ports (specifically the Garrett GTX 2860R), I've seen multiple people say that the coolant intake should be the lower of the two ports, and the return should be higher. I was curious as to why this is. My thought process was that you'd want the fluid to flow from high to low, so this setup is counter intuitive to me.

ATL BRZ · 07-11-2019, 10:52 AM

Quote:

Originally Posted by James Russels

For turbos that have coolant ports (specifically the Garrett GTX 2860R), I've seen multiple people say that the coolant intake should be the lower of the two ports, and the return should be higher. I was curious as to why this is. My thought process was that you'd want the fluid to flow from high to low, so this setup is counter intuitive to me.

Look up the first law of thermodynamics. You want the coolant to enter on the low side so that it enters the hot center housing and rises out of it on the high side after the heat is exchanged into the coolant, promoting flow.

James Russels · 07-11-2019, 06:29 PM

Hey, thanks for the reply. Your video has actually been one of my main references for the install and it has been a huge help, so thanks a ton for posting that. I'm not a physics guy so I'm having a hard time understanding how the first law of thermodynamics would apply to this. Regardless of the heat, wouldn't the fluid still have to flow upwards, and therefore wouldn't that impede flow since it'd have to be pumped, versus flowing down with the assistance of gravity?

07-10-2019, 05:26 AM	#1
James Russels Member Join Date: Sep 2015 Drives: 2013 FRS Location: Chicago, IL Posts: 59 Thanks: 5 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Turbo Coolant Question For turbos that have coolant ports (specifically the Garrett GTX 2860R), I've seen multiple people say that the coolant intake should be the lower of the two ports, and the return should be higher. I was curious as to why this is. My thought process was that you'd want the fluid to flow from high to low, so this setup is counter intuitive to me.

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07-11-2019, 06:29 PM	#3
James Russels Member Join Date: Sep 2015 Drives: 2013 FRS Location: Chicago, IL Posts: 59 Thanks: 5 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hey, thanks for the reply. Your video has actually been one of my main references for the install and it has been a huge help, so thanks a ton for posting that. I'm not a physics guy so I'm having a hard time understanding how the first law of thermodynamics would apply to this. Regardless of the heat, wouldn't the fluid still have to flow upwards, and therefore wouldn't that impede flow since it'd have to be pumped, versus flowing down with the assistance of gravity?

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