In Water/oil Turbo.. If We Connect Only Oils?

[GreeceS13]

There are oil cooling turbos (greddy) and water/oil cooling turbos(garret)..

If we connect only oil lines in turbo like T04Z we will have any problem?

Because I hear some people to tell that the water in turbo is useless as some times is very hot.

So I want to hear proff opinions.

Ofcourse it isn't the problem the money for the pipes but my mechanic told me to don't connect water in turbo and I fear!!!

[paulR32gtr]

I have done this with a mitsubishi turbo before and had zero problems.

I would even expect with the larger surface area of the water cooled turbo core that it would dissipate heat slightly better than a non-water cooled core even without the water lines connected.

That said - I still prefer to connect them up to water as well (even though it is always such a pain getting the damn things connected!)

[GeeTR]

My experiences differ.

A good mate fried a water cooled T66 flowing about 450hp; he'd not been running water through it.

Remember, ball bearing units like the Z have restrictors that limit the oil flow... so oil alone wont be enough to cool the cartridge (unlike journal bearing units)

I would think the water jacket around the core... thats supposed to have a cool medium flowing through it?... would act as an insulator and trap heat in if not connected.

Although not 100% definitive evidence as such, the little lab monkey sitting on my shoulder wearing a lab coat, holding some verniers and a calculator screams to run the turbo in which the way it was designed to... specially when its of little expense or effort to do so.

Edited April 12, 2008 by GeeTR

[-33-]

Connect it up without a doubt. Water has a quite high specific & volumetric heat capacity; therefore it can carry quite a bit of heat energy away from the core and do a pretty effective job of cooling the turbo - by no means useless. And a larger surface area by itself, without any water flowing through, will still suffer from heat soak.

And its really not a massive job

[Adriano]

Is your mechanic prepared to wear the warranty on the turbo outside manufcturer warranty if it shits itself?

[Sydneykid]

There are oil cooling turbos (greddy)

They are plain bearing

They have no oil flow restrictors and hence flow lots of oil

and water/oil cooling turbos(garret)..

They are (generally speaking) ball bearing

They have oil flow restrictors and hence don't flow a lot of oil

So the answer is simple, there is not enough oil flow to cool them on its own, that's why they have water cooling.

Cheers

Gary