BLAAST

nobody said it would make your car faster.

A engine oil cooler just helps cooling down the engine oil. It is a wonderfull thing but it does nothing to eliminate hot spots that cause the temperature rise in the first place.
On a turbo car, the turbo chra is the hottest spot of the whole system that the oil sees, cooling this heat source down is the most important thing and in that regards, Watercooling is a "low hanging fruit" because it's a cheap yet very significant cooling upgrade that pays off on the turbo, the whole engine and the oil maintenance. Furthermore, rare thing, it has no real drawback performance-wise.

mielko

but from where can i take the coolant?
my idea would be,take the line that runs threw the throttle body,and back.
is that the right way?

tnks

Slo_crx1

That's how I run mine, works fine. I've seen quite a few oil-cooled turbos on regular street cars that were starting to get some nasty buildup on them. I would personally rather have an oil/water cooled turbo than just a normal oil cooled, especially for the reasons Blaast mentioned. Hot thin oil does not sound too healthy in my book, especially when seeing 8k rpm's on a daily basis (in my car). Oil temp in an n/a car can reach 400* and up, do you really want it getting any hotter?

BLAAST

on the h22'S there's a factory oil channel under the oil filter, I like to stretch on of these hoses to watercool the turbo.

I have also seen people use the heater hose and even the smaller, but still sufficient hose that is normally watercooling the intake. Good way to re-use this water channel that is most of the times disabled on most of our HMT cars.

con

this retard did

Hitchhikkr

ROFL, your theory is right, lower intake charge is more power. But you must consider 200degree F. coolant running thru the chra isnt going to cool the compressor enough to net you any real world horsepower gains. Will your turbo live longer? Yes, its been proven. Will you lower the intake charge enough to make any significant power? Doubtful.

FrozenInEdmonton

Here is an article that I found on the web.

http://www.airpowersystems.com.au/wrx/aps_turbo.htm

As far as "highroller54" calling me a retard because I said the cooler turbo would make more HP, I didn't say how much more HP. True it might be minimal but decreasing the temperature will defiantly increase the HP if it is backed up with the more fuel. If you follow the link you will see at the far left on the graph before the engine was turned off the temperature of the oil cooled turbo is 1650 deg F and the oil/water cooled turbo is 800 deg F. How much hotter will the air charge be on the output side of the compressor be I don't know but anybody with a brain would have to say at least a little.Why do we put on a intercooler turbocharged engine, or a hood scoops on our cars? Answer to get cool denser air into the engine.

Water Cooling

Whilst turbochargers began to be applied to passenger cars in the late 1970's in response to the energy crisis, the first generation passenger car turbochargers were derived directly from commercial diesel engines. Engine oil was used to provide both lubrication and cooling and whilst this was an effective compromise between cost, durability and performance, in high engine performance applications durability suffered through fouling of the turbocharger bearings through high turbine and bearing temperatures.

By encasing the turbocharger bearings in intricate water passages, engine coolant is used to significantly reduce turbocharger bearing temperatures in order to eliminate the coking and lacquering issues that fouled old fashioned turbocharger bearings. Non water cooled turbochargers have no place in a high performance gasoline engine application and should be avoided at all costs.

http://www.airpowersystems.com.au/wrx/aps_turbo.htm

The graph (follow the link) above shows the turbocharger bearing temperature leading up to engine shutdown and for 20 minutes following shutdown. The temperature is displayed relative to the coking threshold of high quality mineral based oil.

As is clearly evident, the old fashioned non water cooled turbocharger operates above the coking threshold when under high load and experiences a very high temperature increase through heat soak immediately after engine shutdown. The APS water cooled turbocharger on the other hand remains cooler than the coking threshold at all times and the bearing temperature increase through heat soak immediately after shutdown is reduced drastically.