The cooling point is good. Oil does burn higher but it does still break down due to heat. It may not burn while sitting by the bearing but it will breakdown thus causing lmore friction. If the oil is moving it will not have as much time to breakdown in the high heat turbo area.

 

Take a look at this link again (it has been mentioned before) convinced me that a TT is not needed, but if one wants to buy piece of mind go right ahead, it's your money and you can spend it any way you want.

http://www33.brinkster.com/cammiecam/turbo.htm#


Jason

 

That is a good link. It is very well done. It does show the boiling point of oil's although it does mnot have any discussion of viscosity breakdown at different temps. It is a 55degree difference at 15 minutes and any less than 4 minutes is also a waste. My timer is always set for 5 minutes. Eitehr for cooling the car down or warming it up in the winter. I have learned through gas mileage that 5minutes uses almost no more fuel than 1 or two minutes. I did try 10 minutes but i seemed not to be able to hit 300 miles per tank in town. I think that it definately an opinion and a preference just like the cai debate. Do what you want.

 

What about aftermarket turbo's such as the VF, PE, APS and bigger turbos that we commonly use for street use. Are the same cooling fundamentals present in those also or is that when a turbo timer would come into play?

Brandon

 

I asked this question before and got no response from anyone on the boards. I think that you may want to ask the manufacturer about this before buying the turbo, that is what I plan on asking before I buy a new turbo.

Jason

 

One of the reasons I use synth oil is because of the turbo. I have a feeling that the oil will be a heck of lot more stressed when the turbo is spinning (they can spin upwards of 125K RPM) than when it's not moving after you shut the car off and there is no more exhaust going through it but coolant is there to carry away the heat.

some detail on the coolant / oil flow:

 

Peaty, do you know anyone with an aftermarket turbo? If so does their turbo have the same cooling and oiling setup as Subaru? I think Jason and Brandon bring up good points. We have seen that other than preference a turbo timer may not be needed on stock turbo, but what a bout an aftermarket one? Just curious. I am thinking of getting a vf34 down the road.

 

I don't know the answer to that having not seen that tubo myself, sorry. I suspect it will have the coolant cooling too but that's only a guess and wishful thinking.

Peaty