Turbo cooling..

[TRDcelica90]

My car overheats a little since i changed turbos to an aftermarket garrett.. just goes over the normal temp range. but i know why. i opened up the hood and see one of my turbo coolant hoses shaking.. so i assume its just air in the system.. i worked out that i havent really set it up properly because the top is spose to be gravity fed.. so i just changed it around turned some hoses around and now the top should be feed with coolant properly..

BUT the coolant exit side has to travel upwards to go back into the stock return location.. would this mean that coolant is getting trapped inside the turbo and just sitting there?? so it has to use gravity to exit the turbo or would the water pump be pushing the coolant out??

[TRD-12A]

The water pump should be pushing the water through easily it must have air in the system is it still shaking or you hav'nt tried it since you swapped the hoses around??

[thechuckster]

do you still have access to one of the bypass connections (that fed the original turbo) on the metal hoses wrapping around the block? And the hot inlet (from the turbo) on the metal hose going to the radiator? then use them as they're the ideal spots for cooling the turbo.

The cooling system relies on hot stuff rising and cooler staff falling. (aka convection). Simple rule of thumb: Cool coolant from below and hot coolant out the top. The spud is not 'gravity fed'

You will get bubbles forming as super-heated water from the turbo encounters cooler water or an expansion point (e.g. small hole meets larger ID hose, etc). That may explain the shaking hoses.

If you have somehow managed to turn the the turbo cooling loop into a giant bypass around the thermostat (and thus the engine), the engine cooling system will get stressed..

[TRDcelica90]

chuckster great info mate.. yes im still using the original turbo cooling points.. the OD of the garrett cooler inlet/outlet is 14mm. the stock turbo ones are around 10mm.. i gor round this by using 10mm then putting the 14mm over it and clamp..

i went rad top hose to top of garrett, bottom of garrett to pipes, so you think i should swap them around??

thanks mate

[Norbie]

The cooling system relies on hot stuff rising and cooler staff falling. (aka convection).

Que? The water pump moves the coolant around the system, not convection.

[MWP]

I have read turbo setup docs that do state the coolant return line should be higher than the feed for this reason.
But IIRC it was mainly for cooling after the engine is turned off.
Im not sure if it has the same effect, or needs it when running.

[thechuckster]

Que? The water pump moves the coolant around the system, not convection.

you're right - it needs clarification - when motor is off, convection (based on thermal differentials) will move fluid around.

TRDcelica90: no - i read your original post as you doing the opposite.