Combination Oil Cooler

[Spartarus]

EDIT:


Don't interfere with the oil return from the turbo. /thread

[Spartarus]

EDIT:

Forget it, bad idea

[stugray]

It would work.
I would use an electric oil pump to supply the turbo.
That way you get consistent oil flow under all circumstances and you can set it up to pre/post-oil the turbo with some timer/delay circuits

And buy this oil pan:
http://www.ft86club.com/forums/showthread.php?t=78439

[steve99]

Originally Posted by Spartarus

The Explanation:

Run a standard oil-water cooler off of a filter sandwich plate. OEM forester style, or Cusco... and run an air-oil cooler off the turbo oil return line.

Possible advantages:

All-season operation at stable temperatures, oil warms up quickly in both summer and winter, minimizing engine wear.

Possible problems:


Flow??? How much oil actually passes through the turbo? Enough?

The air side of this cooling system is not thermostatic and is totally dependent on turbo oil flow. If it's not enough oil flow, this design is pointless and potentially harmful, returning very cold oil very slowly to the pan to mix with very hot oil... If it's too much, the engine runs cold and the water cooling system fights against the oil cooling system. OEM water thermostat Opening starts at 90C (194F) and is fully open at 95C - Normal Engine running temperature is 90-92C (194-198F). This only works if the oil remains at or higher than water temp.

Also, I understand the turbo oil is tapped off of a gallery plug.. Will the added resistance of an oil cooler core significantly reduce oil flow to the turbo?


This whole theory depends on how much oil flows to the turbo, and I have NO IDEA how much that is.......???????

Do as mishimoto do on 2015 wrx , double stack a oem cooler and an air\oil cooler sandwitch plate.

it should fit under bonnet i have oem cooler and still about 50 mm clearance to bonnett.

http://engineering.mishimoto.com/wp-...Oil-Cooler.jpg

http://engineering.mishimoto.com/cat...oler-kit-2015/

[P@ul]

/\ What he said; Mishimoto is already doing it with the factory OEM oil "maintainer" and the separate oil cooler on top of it with a thermostat.

There's DIYs to do the OEM style oil cooler. I haven't seen anyone try both coolers on the twins, but a friend of mine is very interested if this fits. He's got a boosted FRS, and want's his oil to heat up faster.

[Calum]

Why not take a suction from the oil pan, pass the oil through a cooler and then send it back to the pan? Use an old VW fan switch and a relay to turn on the pump. It might not be as effective as the normal setup, but for your climate and driving it could be enough. It also wouldn't introduce a pressure drop in to the engine's oil circuit. And it wouldn't cool the oil in the winter.

It wouldn't heat the oil up faster in the winter though.

[Spartarus]

Update: seems that the general consensus is the turbo oil return should be unrestricted. Restrictions in the return seem to reliably cause leaks in the turbo's oil seals... I'm working on a new idea... Most parts showed up today and yesterday, just waiting on some hose and the turbo kit. Keeping a lid on it until I have photos. Should be end of next week.

EDIT: Nope, answer is keep it simple stupid. I used a closed-when-cold tstat plate to the air-oil heat exchanger.