Real-time Oil temperature Analysis - Pre/Post Coolant Loop Oil Cooler Install

[mit_peid]

Originally Posted by ecko04

Basically the parts you need are:

21311AA170

21317AA070

Gates 3/8" Heater Hose. Gates Part #28489

Some clamps

Total should be around $200 after shipping.

Is it better to use 3/8" heater hose or 1/2" heater hose. I thought OEM oil cooler has 1/2" inlet and outlets?


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[Kostamojen]

The OEM cooler technically has two different sized pipes.

[mit_peid]

Originally Posted by Kostamojen

The OEM cooler technically has two different sized pipes.

So I'm assuming the 1/2" oil cooler inlet would be best matched with the 3/8" inlet of the throttle body with a 1/2" hose, and the 3/8" oil cooler outlet is better matched with the 1/4" outlet of the throttle body with a 3/8" hose to avoid fitting a 1/2" hose on a 1/4" outlet. (??)

[Kostamojen]

Originally Posted by mit_peid

So I'm assuming the 1/2" oil cooler inlet would be best matched with the 3/8" inlet of the throttle body with a 1/2" hose, and the 3/8" oil cooler outlet is better matched with the 1/4" outlet of the throttle body with a 3/8" hose to avoid fitting a 1/2" hose on a 1/4" outlet. (??)

Both of them are larger than the throttle body hoses.

I don't recall the exact sizes, I did mine over a year ago, but its all in the other thread.

[mit_peid]

According to Wayno above, the throttle body is 1/4" out and 3/8" in. @Kostamojen did you tap into the coolant via the throttle body as well?

[Kostamojen]

Originally Posted by mit_peid

According to Wayno above, the throttle body is 1/4" out and 3/8" in. @Kostamojen did you tap into the coolant via the throttle body as well?

I did the full OEM setup. Tap from the block and the OEM heater hose tube from the Forester.

[mit_peid]

Originally Posted by ecko04

Basically the parts you need are:

21311AA170

21317AA070

Gates 3/8" Heater Hose. Gates Part #28489

Some clamps

Total should be around $200 after shipping.

3/8" will only fit the OEM the outlet. I think you need 1/2" for the OEM oil filter inlet. Do we need two sizes of hoses?

[steve99]

Originally Posted by mit_peid

According to Wayno above, the throttle body is 1/4" out and 3/8" in. @Kostamojen did you tap into the coolant via the throttle body as well?

If you look at @Kostamojen
video with temp here http://www.ft86club.com/forums/showp...1&postcount=82

you can see his oil temps still climb after sustained hard driving. He has routed coolant via the oem method with large coolant supply lines and large coolant supply points.

This would lead me to believe the limiting factor with this cooler is the surface are of the heat exchanger between the oil/coolant or the fact your trying to loose heat to the coolant which is already at around 200 degrees ie you dont have a large temperature differential to work with.

His coolant does not go over temp so I suspect its the surface area of the oil/coolant heat exchange thats limiting performance rarther than the flow of coolant.

[mit_peid]

Yeah I agree. The surface area of the OEM oil cooler is too small to be used for true racing applications. I think that you also have a good point that we're trying to "cool" oil with 195 degF coolant which probably won't do all that much. I'm just wondering how much a difference is it between tapping into the throttle body and the "true" Forester/WRX method using the OEM oil cooler.

[steve99]

Originally Posted by mit_peid

Yeah I agree. The surface area of the OEM oil cooler is too small to be used for true racing applications. I think that you also have a good point that we're trying to "cool" oil with 195 degF coolant which probably won't do all that much. I'm just wondering how much a difference is it between tapping into the throttle body and the "true" Forester/WRX method using the OEM oil cooler.

I suspect not much difference, probably just use the easier throttle body method as the guy above has pretty well proved out the cooler will run out of capacity even if supplied with lines same size a cooler lines as per OEM method , with sustained hard driving.

If your boosted I would give this type a miss and get a thermostatically controlled oil/air cooler.

This one probably more suited to NA cars with light track or road use as an oil temp stabiliser rarther than full blown cooler.

[jvincent]

I just installed the throttle body fed cooler yesterday. We'll see how it holds up on the track.

I'm NA and have an OFH that I'll be installing once I get it ceramic coated and all the snow and crap is gone from the roads here.

[mit_peid]

I am boosted but I don't really track my FRS. I've just noticed my oil temps being slightly higher after being boosted with regular daily driving. As others have noted this car in NA form gets relatively hot at the track without an air-to-air cooler. The combination of FI (SC not turbo) and the inter cooler blocking the radiator is likely the cause of my increase. Hopefully this little easy OEM method will help me lower/stabilize my oil temps just a tad (maybe ~4 deg F).


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[mit_peid]

@jvincent what size hose did you use? All 3/8", all 1/2", or combination of the two?


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[jvincent]

Originally Posted by mit_peid

@jvincent what size hose did you use? All 3/8", all 1/2", or combination of the two?

All 3/8".

It was a bitch to get onto the larger fitting on the cooler and is actually a little loose on the throttle body fittings but I just made sure the hose clamps were tight.