Turbo coolant feed source
 

So i just finished up a rebuild for my TII, and i don't really see why mazda decided to run the coolant feed to the turbo straight from the actual block. Doesnt seem to make sense to send coolant through all the housings first, and then expect the temps to be low enough to cool down the turbo at all

So my question is, can you bypass the heater core and run a turbo coolant feed from the bottom of the radiator? (where the coolant temps are probably the lowest they will be)

..and are there any other options?

I think that's a very low pressure area of the cooling system, so it'll be a very inefficient system (for the turbo coolant flow).

I think Mazda desgined their system so that the turbo coolant feed line was as short as possible?

It doesn't matter if the coolant is a little over 200F versus maybe maybe 50F degrees cooler...
The turbo (CHRA) gets a LOT hotter than that.
The reason to run coolant through the turbo is to keep the oil from coking in the center.
We're talking preventing the oil from hitting 300F+.


-Ted

Nicely put Ted, but don't non water cooled turbo CHRA's see way above 300 degrees?

Are they designed differently to reduce coking?

Dry centers - CHRA's with no coolant flow - rely 100% on oil to keep it cool.
Yeah, oil is used to keep the turbo centers cool.

This is why the coolant ones are superior to prevent coking and keeping the turbo cooler.


-Ted