2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Turbo 2 coolant routing for efr turbo

Old Nov 10, 2018 | 07:28 PM
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From: chino,CA,USA
Turbo 2 coolant routing for efr turbo


Here
Is the A the feed for the turbo and B the return is this correct? Thank you
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Old Nov 11, 2018 | 02:16 AM
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A (back of the water pump) is for the thermowax through a barb on the rear iron through the throttle body to A. The turbo is circulates through a hardline on the lower intake manifold through the turbo to "B" on the lower section of the water pump.
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Old Nov 11, 2018 | 12:18 PM
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Can i use A as a coolant feed and B as a return?
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Old Nov 11, 2018 | 08:19 PM
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This is how I understand it so anyone can correct me if I'm mistaken. This is the way coolant circulates once the thermostat opens and it can draw water from the lower part of the pump housing that's attached to the lower part of the radiator.


flow path
The bottom barb is for the stock return from the turbo and coolant is drawn through it since it's on the "cool" side. the top barb is the thermowax coolant return.

barbs on back
You can see the top barb ends right before the thermostat so once that opens coolant should circulate out this upper part if you use them to water cool a turbo since one on the "hot" side and the other is on the "cool" side it should circulate around fine.


inside upper part of housing

Last edited by Mlammert; Nov 11, 2018 at 09:19 PM. Reason: grammar
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Old Nov 11, 2018 | 10:36 PM
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Thank you. I guess what confused me is that the turbo coolant return is on the cold side so wouldnt that make the temp of the coolant hotter going into the engine ? the turbo inlet side is the hot coolant coming from the engine?
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