IW STi Forum banner

1 - 18 of 18 Posts

·
Registered
Joined
·
560 Posts
Discussion Starter #1 (Edited)
I've been wanting to use my Setrab oil cooler so I decided to take Process West oil cooler mount as an inspiration as I no longer like low mounting location.

I did some measurement and the 5cm thick Setrab will just fit behind the upper grill. Got to be mindful towards the hood release as it will be very close.

So on with the mock up for the mount.


Bumper on, and looks good.


So I called up a stainless steel welder and he came by to re confirm the measurement. We probably run over the measurement 5 times as it needs to be very precise or else it will hit the front upper grill duct or the bonnet release spring.

Today the welder came and he actually polished the bracket. Wow, ok I guess I won't be needing to paint it then :D

3 points mounting for strong and secure mount.


Insert the Setrab oil cooler rubber mount on each corner and insert the oil cooler. Perfect.





Moment of truth; put the bumper back on and secure the upper mount. It fits like a glove.





All good.




Next week is time to connect the oil cooler to the engine.
 

·
Registered
Joined
·
560 Posts
Discussion Starter #2 (Edited)
So got new fastener for the oil cooler and I am thinking I should cut out the middle part of the grill.

Like this (area inside the red line):
 

·
Registered
Joined
·
560 Posts
Discussion Starter #3
Installation day: success!

But not all went as planned. The oil sandwich adapter for the oil tempt sensor needs a new gasket, and the wire for the oil temperature sensor is too short also. Bummer. So unfortunately that will have to sorted at a later date.


The braided hose is from previous install where the cooler is mounted on the front left. Because I am now using twinscroll manifold, the route will have to go from the right side of the car and thankfully the hoses fits with enough slack. I Had to change the fitting from straight to 90 degree for the connection to the Mocal thermostatic sandwich plate.


I decided to use allen bolt, spring washer and lock nut to secure the oil cooler. Rubber insulator from Setrab is also fitted between the bracket and the Setrab oil cooler.


And job done. Well, not yet as I have to go back and sort out the oil temperature sensor. But other than that I am glad that the oil cooler install went very smooth. I have not cut upper grill the center piece yet, so that will have to be for another day also.

This setup will require up to 1 liter additional engine oil. Not bad.

Some may question why have the oil cooler port facing down. Well, there is no other way since not much room for fittings for port facing up. I e-mailed Setrab USA and asked if my setup will be ok and they said it is completely fine.
 

·
Registered
Joined
·
560 Posts
Discussion Starter #4
So one of the thing I look forward to seeing other than the oil temperature itself, is the coolant temperature. With the core sitting behind the upper grill duct, there may be coolant issue.

But the good news is there is no problem at all.

Hot idle, air condition switched on (hot and humid in here):


Normal driving wise, the coolant temperature is as before. Between 88 to 95 Deg C, depending if the fan is on or not.

Took the car to 160km/h+ on a single pull (air condition off, of course), on 29 Deg C ambient tempt, and the coolant tempt went down to 82 Deg C. As with my past experience, having an oil cooler made it felt like it significantly increased the car's stamina at the top end. Not that it gained power, but it doesn't easily lose power due to heat soak pull after pull.

Next is to get the Killer Bee oil pan bolt with 1/8 NPT for the oil sensor.



I figured that's the better way to measure the oil temperature and no need to run another sandwich plate just for oil temperature sensor. The temperature reading on the sandwich plate is about 220 Deg F and can easily soar to 240 Deg F when racing the engine. Not sure what the temperature is like inside the pan though I read someone here did multiple location testing and seems like the numbers are consistent be it at oil pan or sandwich plate or the rear oil galley.
 

·
Super Moderator
Joined
·
10,687 Posts
So one of the thing I look forward to seeing other than the oil temperature itself, is the coolant temperature. With the core sitting behind the upper grill duct, there may be coolant issue.

But the good news is there is no problem at all.

Hot idle, air condition switched on (hot and humid in here):
Image Link


Normal driving wise, the coolant temperature is as before. Between 88 to 95 Deg C, depending if the fan is on or not.

Took the car to 160km/h+ on a single pull (air condition off, of course), on 29 Deg C ambient tempt, and the coolant tempt went down to 82 Deg C. As with my past experience, having an oil cooler made it felt like it significantly increased the car's stamina at the top end. Not that it gained power, but it doesn't easily lose power due to heat soak pull after pull.

Next is to get the Killer Bee oil pan bolt with 1/8 NPT for the oil sensor.

Image Link


I figured that's the better way to measure the oil temperature and no need to run another sandwich plate just for oil temperature sensor. The temperature reading on the sandwich plate is about 220 Deg F and can easily soar to 240 Deg F when racing the engine. Not sure what the temperature is like inside the pan though I read someone here did multiple location testing and seems like the numbers are consistent be it at oil pan or sandwich plate or the rear oil galley.
I'm really interested to see the difference in temperature between the two locations.
 

·
Registered
Joined
·
560 Posts
Discussion Starter #6
I'm really interested to see the difference in temperature between the two locations.
Yeah me too.

But I will not be able confirm if there is any difference between the oil sandwich plate and and the oil pan, because I have not measured the current oil cooler setup’s result from the oil sandwich plate. The temperature measurement I mentioned on previous post is without oil cooler and taken from the oil sandwich plate.
 

·
Registered
Joined
·
560 Posts
Discussion Starter #7
Just a little update.

Previously the engine will lose a bit of oil when I took it to 140mph+. The engine oil is Liquimoly Leichtlauf 5w40. This is a pretty good oil as it only begin to lose oil at 140mph+.

Now there is no oil loss.

Great!
 

·
Registered
Joined
·
560 Posts
Discussion Starter #8
Well, here it is:


Oil tempt sensor attached. Need better socket but this will do for now. (I don't think is a good idea to twist the oil tempt sensor wire.)


I set my gauge's warning light to flash when oil tempt is below 176 Deg F.


Hot idle, air con on. Outside tempt around 35 Deg C.

Now here is photo of oil tempt sensor attached on the oil sandwich plate:

Hot idle, air con on. Outside tempt should be around 32 Deg C.


So I don't see any different of oil tempt during hot idle between oil tempt reading at oil pan or at oil sandwich plate. But now with oil cooler I haven't seen the oil tempt reaching 220 Deg F+ - Both in traffic and highway cruise.

Next test is hot run and I know without the oil cooler the oil temp can reach 240 Deg F.
 

·
Super Moderator
Joined
·
10,687 Posts
Thanks for sharing, good stuff.
 

·
Registered
Joined
·
560 Posts
Discussion Starter #10
At least now we know there is no difference between reading at oil pan or at oil sandwich filter.

Afterall Subaru Japan did offer oil tempt sensor kit and that too is installed on the provided oil sandwich plate.
 

·
Super Moderator
Joined
·
10,687 Posts
At least now we know there is no difference between reading at oil pan or at oil sandwich filter.

Afterall Subaru Japan did offer oil tempt sensor kit and that too is installed on the provided oil sandwich plate.
In my mind I’ve believed this from the beginning. Ok if I share your post on the Book of Faces?
 

·
Registered
Joined
·
560 Posts
Discussion Starter #13
And so I just took the car for a good exercise in the name of science.

Ambient tempt 29 Deg C:

1. Steady state fast cruise can result in oil tempt dipping to 190 Deg f
2. Race the car with acceleration, deceleration, braking and gear shifting the oil tempt stays steady between 200 to 205 deg F.
3. Single pull to 140mph+, oil tempt steady between 200 to 205 Deg F.
4. Normal drive around town, oil tempt betwee 200 to 205 Deg F.

So that is a significant reduction of oil tempt vs not using oil cooler, but not much to be below 200 Deg F. I don’t think I need to cut open the upper grill duct to try to get more air into the pil cooler.

And as previously mentioned the coolant tempt is as good as ever. I didn’t get to see what the coolant tempt was when racing the engine, but during the single pull to 140mph it was at 83 Deg C (note: I also have Dom’s 4th cylinder coolant mod and still on oem radiator).

So after the test I went to get coffee for the morning and I let the car idle with air con on, to see what the oil tempt is like. It gradually decreasing from 205 Deg f all the way to 179 Deg F before settling at around 182 Deg F.

And that concludes this oil cooler project.

Time to go back to race circuit!
 

·
Registered
Joined
·
945 Posts
Sweet gauges and diag.
I was always curious about the temp difference between a cooler or not and averaging low 200s vs 220-240 i bet thatll help during track daze.
 

·
Registered
Joined
·
560 Posts
Discussion Starter #16
Sweet gauges and diag.
I was always curious about the temp difference between a cooler or not and averaging low 200s vs 220-240 i bet thatll help during track daze.
Absolutely. The oil cooler helps because prior to converting to R205 Spec C twinscroll turbo I went for a couple of track day with oil cooler installed. The Subaru service guys didn’t believe me that I did track day because others who went without oil cooler always struggled with overheating while I don’t. The engine didn’t even lose oil or coolant and it went for many2 laps until my AD08R and brakes are gone. If I remembered correctly at that time the oil tempt stayed steady at 220 Deg F During track day.
 

·
Registered
Joined
·
560 Posts
Discussion Starter #17 (Edited)
So a friend bought Mishimoto oil cooler kit; and it don't fit UK model STI due to couple of reasons; the front bumper beam is much deeper towards the air conditioner radiator and there is a thick front lower plastic guard.

But is a good thing as low mounting location is a bad idea in my opinion.

Since the Mishimoto oil cooler is thicker the upper grill duct piece is preventing it from center mount position.



And it is mounted at a slight angle due to clearance (can only be seen if viewed from the top). Which is ok.



That protection sleeve uses sticker to wrap it together, but since I don't trust it a zip tie is recommended.


But there are more problems when installing the sandwich adapter. Due to the shape of the sandwich plate, the OEM water cooled oil cooler adapter pipe will hit the sandwich plate. Thankfully the kit includes another spacer plate adapter which provides the much needed clearance (supposedly to be used when installing on WRX...).

Start the engine, and moments later a leak was detected coming out from spacer plate sensor port. Bastards...


Well by the end of the day the kit is successfully installed - but knowing this the owner would have just piece together a better kit (Setrab core, Mocal plate etc). I also think the rubber gasket on the mishimoto sandwich plate may not be reliable.

 

·
Registered
Joined
·
560 Posts
Discussion Starter #18
Just a little update.

driving on hwy, nothing crazy just easy cruise 62mph - 80mph and the oil tempt went below 176 Deg F and the coolant went down below 80 Deg C. Not sure how far it went down to as I only saw both my gauges flashes its warning light (indicating it went below the set target). The ambient tempt was 27 Deg C.

Looks like the oil cooler is more effective that I thought.
 
1 - 18 of 18 Posts
Top