OEM Oil cooler from the 2.0 DIT Forester

[regal]

Originally Posted by Kostamojen

Anyway, some diagrams...

DIT coolant diagrams:



BRZ Coolant Diagrams:



This is what I'm thinking:

This is awesome stuff, nothing worse than an air to liquid oil cooler on a street car. The Subaru engineers chose this method because it makes most sense.

However I don't think your proposed coolant flow will work well because there isn't a pressure gradiant, you have to force the coolant thru the cooler because its a constriction. With your proposal you would want to eliminate the elbow instead of bypassing it.

[FearBoy]

Originally Posted by regal

This is awesome stuff, nothing worse than an air to liquid oil cooler on a street car. The Subaru engineers chose this method because it makes most sense.

However I don't think your proposed coolant flow will work well because there isn't a pressure gradiant, you have to force the coolant thru the cooler because its a constriction. With your proposal you would want to eliminate the elbow instead of bypassing it.

I just assumed that was what he meant with the diagram. In any case, this would be much better than an air/oil cooler for street cars. Oil operating temp would be maintained much better with this (or the Robispec).

[regal]

Originally Posted by FearBoy

I just assumed that was what he meant with the diagram. In any case, this would be much better than an air/oil cooler for street cars. Oil operating temp would be maintained much better with this (or the Robispec).

IMHO this is the ticket, someone also posted about an aftermarket coolant to oil cooler but it had oil line feeds.

What makes this so awesome is there is zero increase in a risk for a catastrophic oil leak (IMHO.)

[xwd]

New Cusco version, uses two radiator hose "taps" with banjo fittings. Old version had a block fitting for the return side. You could probably get a couple of those radiator hose taps people use for gauges with the NPT fittings.



Here is the install manual (in Japanese) but has a bunch more diagrams.

http://www.cusco.co.jp/products/pdf/...130806-%29.pdf

[ATSAaron]

What is the part number for the bolt?

Thanks,

Aaron

[regal]

Originally Posted by dwx

New Cusco version, uses two radiator hose "taps" with banjo fittings. Old version had a block fitting for the return side. You could probably get a couple of those radiator hose taps people use for gauges with the NPT fittings.



Here is the install manual (in Japanese) but has a bunch more diagrams.

http://www.cusco.co.jp/products/pdf/...130806-%29.pdf

Can you buy this in the USA ?

[xwd]

The Cusco kit? Yes at least one guy was installing it, he got it from FT86SpeedFactory? I think or maybe Rallyperformance. It costs over $700... now I'm not 100% sure the oil cooler is the OEM one but it sure looks like it.

I think you could duplicate the kit for about $200. Use the parts Kosta referenced from Subaru, buy a couple of those radiator hose to 1/8 NPT adapters off ebay for cheap (they are $10-15) and then you just need the NPT to hose fittings to connect it to the oil cooler like these:

http://www.summitracing.com/parts/ear-984004erl

Cusco uses some fancy banjo fittings, you could get those too if you really wanted to.

The upper radiator hose is 38mm, I bought an adapter to use with a water temp gauge awhile back, the lower is probably the same.

Only thing it looks like the Cusco kit has over a DIY is custom molded tubing.

[Kostamojen]

Originally Posted by dwx

Only thing it looks like the Cusco kit has over a DIY is custom molded tubing.

Which the Cusco kit apparently doesn't have...

[regal]

Originally Posted by dwx

radiator hose to 1/8 NPT adapters

I didn't see any 36mm on ebay but found this,

http://www.k2motor.com/aluminum-wate...utm_medium=cse

[xwd]

Originally Posted by Kostamojen

Which the Cusco kit apparently doesn't have...

Haha you are correct, the picture has some...but not the kit.


Edit: I'm using a 38mm Greddy radiator hose adapter for my water temp gauge. There is a chamfered lip on the radiator hose which has an ID of 40mm at the very top but the bottom and meat of the hose is 38mm. I've been using the 38mm one for probably 6 months with no issues. Lower radiator hose looks to be the same size.

[Kostamojen]

Ok, my second idea for piping... This is an attempt to route it like the actual DIT is routed. I'm just not sure if the BRZ has the correct coolant port for attaching a fitting to in order to have it outlet coolant for the cooler.

The inlet pipe is just the Forester one, which I'm not sure how expensive it is but probably not much.



The original Cusco kit uses a fitting on the back of the water crossover pipe thats actually a useful spot for MT cars, but I'm sure their custom fitting is $$$

[xwd]

Yes you get their fitting along with the rest of the kit...

I would just get a set of cheap silicone radiator hoses and connect it up like they did in v2 for the autos. Downside is there is no coolant flow until the thermostat opens if you are looking for an oil warmer as well.

[arghx7]

Originally Posted by regal

This is awesome stuff, nothing worse than an air to liquid oil cooler on a street car. The Subaru engineers chose this method because it makes most sense.

Air to oil coolers take up more space and cost more. They can potentially reject more heat than a water heat exchanger, but it depends on the design. And the heat goes into the oncoming air, not into the coolant circuit like on a water to oil heat exchanger. If you look at a lot of the highest heat rejecting sports cars, it's no coincidence that they have air to oil exchangers. Think about the R35 GT-R and even the Rx-7.

In this case though the most important thing is convenience and cost. If the Forester cooler really can be made to work easily, that would be a great solution.

[Kostamojen]

Originally Posted by dwx

Yes you get their fitting along with the rest of the kit...

I would just get a set of cheap silicone radiator hoses and connect it up like they did in v2 for the autos. Downside is there is no coolant flow until the thermostat opens if you are looking for an oil warmer as well.

That's why I think cuscos kit is a bad idea. No turbo subaru has used coolant routing like that for the oil coolers... its better to use coolant coming from the appropriate areas.