Water direction for cooling in GT30: is there a specific direction?

[180bfj20det]

Is there a specific inlet and outlet for the GT30 turbocharger??

I have installed the turbo, just need to know if there is a water cooling direction for the cartride or can I just run it is any direction I want?

Cheers

[GunMetalR33]

I have the same question, I cant see why it would have to run in a certain direction but I dont know for sure. Did you get anywhere with this 180bfj20det???

[discopotato03]

If the cartridge is horizontal meaning the water fittings are at the same height its not important . If one is slightly higher I would make it the outlet or hot water return to the cooling system as it will probably thermosyphon better when the engine is shut down . The critical thing with water cooling is having the plumping rising to , through and beyond the turbo to preferably the highest point in the cooling system . Do not make the turbo a high point as steam bubbles will get trapped and where there's no water there's no cooling .

When the engine is shut down at running temperature the water pump stops and there is no forced feed . The turbos exhaust housing and manifold being iron can store a lot of heat energy , when water cooled the water will boil in the bearing housing and the steam bubbles rise out the higher pipe and return to the radiator top tank preferably . The boiling water is replaced by cooler water from the lower pipe and on it goes - thermosyphoning .

On the Bluebird I had with the other FJ20 the turbo would gurgle away for about 2-3 minites , you could feel the bubbles rattle their way up the top pipe into the head behind the thermostat and via the top hose to the radiator and overflow tank . Obviously this short but critical time is when the turbo is hot enough to bake the oil to the bearings and damage them over time .

Note that the manufacturers only tend to use 5/16" or 8mm plumbing as it provides adequate water flow .

Cheers A .

[GunMetalR33]

On a RB25 DET block which turbo water line is the "In" line and which is the "drain" line?

The too lines I am talking about are the one on the side of the block under the turbo and the one behind the block in between the block and the firewall.

[r33_racer]

I think the one from behind the block actually goes around to a hose and it gets its flow from the exit of the plenum coolant line...i think. Can someone verify that? Cant recall exactly when i removed the plenum.

Not positive but i think the drain line is the one going to the side of the block??? Someone might wanna check that too.

Edited August 16, 2005 by r33_racer