Garrett Watercooling White Paper
Turbo Mini Forums

In purchasing a turbo I talked with a very helpful resource who sent along the attach white paper from Garrett regarding why the turbos should be watercooled and what you need to do to get the cooling setup properly. I'm not sure if this is possible for our engine configs as I haven't gotten my turbo or manifold mocked up yet.
I know most aren't watercooling here but I found it an interesting read.

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I have the link save in my bookmarks.

http://www.turbobygarrett.com/turbobygarre...ter_Cooling.pdf

This is FORD country, on a quiet day you can hear Vauxhalls rusting.

Not read it fully but currently mocking up my gt1752.

At present the water ports are horizontal to each other but may have a look a clocking the housing so that the outlet is higher that the input.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

The basic summary I got from Garrett and the turbo supplier is that the layout should be that the turbo is cooled after the engine is turned off. This is done by having the exit above the inlet but not so much that is messes up the oil drain. The major gain from watercooling seems to be not during operation but after.