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Old 07-12-2016, 06:11 PM   #1
Titter
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Member#: 416107
Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default 4EAT Transmission Cooler Install

This is on a 2002 WRX Wagon with a JDM Lightweight Front Bumper Beam, but should apply to any GD chassis equipped with a 4EAT.

My Radiator went and I decided to get an all aluminum racing rad but most of them do not have the transmission oil cooler built in for the 4EAT Automatic Transmission.

So what do you do? Well... add one! It is quite simple. Here let me show you. There are a few of these write-ups out there but most have expired pictures and whatnot. Plus i did something a little different with the cooler core placement.

Any old oil cooler core will do. Pick your favorite brand & model. I won't clutter anything up debating Tube & Fin VS Stacked Plate cores, there is a ton of that out there on the interweb.

I chose a B&M Super Cooler. I have one currently on my engine oil cooler and it seems to do the job nicely and was only $100 so i grabbed another one.


You will also need fittings. These are Aeroquip brand. I used 90 -8AN Fittings and 1/2 NPT to -8AN Adapters, and of course grab yourself some braided hose. -8AN Braided Hose is the same internal diameter as the OEM soft rubber trans lines and will slide perfectly right over the stock transmission hard lines under the battery.


So here is where we are going to mount the cooler, behind the fog light on the driver's side. I will explain why along the way.


Cut away the plastic to reveal the transmission cooler lines.


Make yourself some brackets out of whatever scrap metal you have laying around. I used some left over bits of aluminum. The bracket at the back needs to be bent 90 to properly support the cooler core. The other one can be whatever shape you need to fit.


Now here is where we get fancy. Some of you are probably thinking that you will not get proper airflow to the cooler core with it stuffed into the fender well like this. Well, thankfully, Subaru has you covered. The OEM Brake duct that Subaru engineers for your brakes needs to be modified into a sort of "Air-Ramp" (also called a louver).


As you see, there is plenty of space for air to pass to the brakes but still have some air re-directed up above to the cooler core. The plastic "ramp" is held down by pop rivets (i put a zip-tie and a few more rivets in there after i took the pic)


Mount the cooler. Pre-install the 1/2 NPT to -8AN fittings. Make sure you mount it far back enough that it clears the bumper when you put it back on. Also ensure it is on enough of an angle to have clearance between the cooler and the wheel well.


Install your new freshly made lines. You can measure to length before hand or you can measure on the car, which ever you find easiest. If you need to know how to make AN lines, just google it. Summit Racing has a nice how-to on the topic.


Slide the hose on to the ends of the OEM transmission cooler lines and clamp them down. I used two clamps just because I am paranoid. As mentioned, the -8AN braided line is a perfect fit.
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Last edited by Titter; 08-03-2016 at 08:19 AM.
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Old 07-12-2016, 06:11 PM   #2
Titter
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Member#: 416107
Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default 4EAT Transmission Cooler Install

And that's it! You're all done! Don't forget to wrap the braided line anywhere it is rubbing against the frame. Just cut up an old bicycle inner tube and zip-tie the rubber tube around the braided line.

The best part to this install is this special trick. Whenever you are at the track, just pop out the fog light for a full on ram scoop.


i might even try to make some velocity stacks to bolt in place of the fog lights for extra track awesomeness.

Last edited by Titter; 07-20-2016 at 08:48 AM.
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Old 07-12-2016, 08:03 PM   #3
Strider327
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Nice. I used the same core
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Old 07-13-2016, 06:48 AM   #4
Titter
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EJ207 Spec C 4EAT

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yea B&M makes pretty good stuff. and good prices too!
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Old 11-23-2016, 10:54 AM   #5
PrinceVegeta
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I recently installed a Derale 13402 Series 10000 Stacked Plate Transmission Oil Cooler on my 2008 JDM 4EAT WRX!

Went on a road trip up the mountains and my previous tube and fin Hayden couldnt cool it sufficiently, my AT Oil Temp light came up several times while going up the steep hills.

Hopefully the Derale unit will work better now
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Old 11-24-2016, 10:04 AM   #6
Titter
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EJ207 Spec C 4EAT

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just took a look at the Derale unit. it looks decent; similar to a Setrab core. the B&M unit i have is 23 row compared to that 16 row unit. i will be installing a temp gauge soon as i am rebuilting the transmission over the winter. it will be nice to get some actual numbers from this cooler.

you have a V7 STI bottom end on that right? or is that installed on another car? dunno what turbo you got but if you are pushing 300+hp you might want a bigger cooler core than 16row.
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Old 12-26-2016, 01:34 AM   #7
PrinceVegeta
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Yes I have the V7 STI EJ207 Bottom End

Im pushing close to 350AWHP .

My Derale 13402 16row Stacked Plate cooler is rated at 32,000BTU per hour according to the manufacturer.

The B&M 70273 is rated at 15,000 BTU per hour according to the description I found online.

Other than the trans cooler, I have ZERO modifications to my 4EAT. I was advised by my tuner, NOT to put in a Blouch 1.5XTR Twin Scroll as that much power might break my tranny lol.
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Old 12-26-2016, 02:43 AM   #8
Strider327
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Quote:
Originally Posted by PrinceVegeta View Post
Yes I have the V7 STI EJ207 Bottom End

Im pushing close to 350AWHP .

My Derale 13402 16row Stacked Plate cooler is rated at 32,000BTU per hour according to the manufacturer.

The B&M 70273 is rated at 15,000 BTU per hour according to the description I found online.

Other than the trans cooler, I have ZERO modifications to my 4EAT. I was advised by my tuner, NOT to put in a Blouch 1.5XTR Twin Scroll as that much power might break my tranny lol.
Your torque converter will fail yes most likely. Not right away, but after a few strong runs.
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Old 12-29-2016, 07:17 AM   #9
Titter
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Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default 4EAT Transmission Cooler Install

32000 BTU's is more than sufficient.

that little thing packs a punch for a 16row stacked plate.

lets us know how it holds up!

Last edited by Titter; 12-29-2016 at 06:36 PM.
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Old 12-29-2016, 06:46 PM   #10
Titter
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2002 WRX Wagon
EJ207 Spec C 4EAT

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i did a bit more digging and found GVW ratings which is how coolers cores are rated on the OEM level.

the Derale 13402 - 22,500lbs GVW confirmed by Derale.

the B&M 70273 is listed on the Jegs website as 20,500lbs GVW but that conflicts with this info i found.


B&M Cooler Cores
70255 12,000 BTU - 25 Row - 11 x 5.75 x 0.75
70268 13,000 BTU - 35 Row - 11 x 7.25 x 0.75
70264 14,400 BTU - 24 Row - 11 x 5.75 x 1.5
70273 15,000 BTU - 25 Row - 11 x 5.75 x 1.5
70266 20,500 BTU - 40 Row - 11 x 8 x 1.5
70274 29,200 BTU - 45 Row - 11 x 11 x 1.5

all B&M SuperCoolers are stacked plate aluminum.

http://transmissionrepairguy.com/transmission-cooler/

this site list the 70264 @ 24,000 GVW and the 70266 @ 28,000 GVW.

since the 70273 is in between the 70264 and 70266 then wouldn't it sit somewhere between 24,000-28,000 GVW rating? not down at 20,500 GVW like Jegs rates it at.

i cannot find confirmation from B&M on the cooler core GVW rating. there is no conversion between BTU and GVW, so you cant just plug numbers into a math formula.

Last edited by Titter; 12-29-2016 at 07:15 PM.
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Old 01-02-2017, 04:35 AM   #11
whiterabbitrexy
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any one know where to drill holes for a 4eat transmission that never came with hard oil trans lines ?
i need to find out where in the transmission has the most pressure oil point and drill a hole for oil to shot out towards the oil cooler then back into the transmission again....also for the return i need to find out witch has the least oil pressure......

im sure it can be done...how do people add oil coolers on old 80s cars ?
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Old 01-02-2017, 07:36 AM   #12
Titter
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Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default

you dont drill anywhere.

http://parts.subaru.com/a/Subaru_200...11-154-02.html

PIPE COMPLETE - OIL COOLER, INLET - 21619AA030
PIPE COMPLETE - OIL COOLER, OUTLET - 21620AA060

they mount on the case as seen in the picture in the above link.
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Old 01-02-2017, 08:15 AM   #13
whiterabbitrexy
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Quote:
Originally Posted by Titter View Post
you dont drill anywhere.

http://parts.subaru.com/a/Subaru_200...11-154-02.html

PIPE COMPLETE - OIL COOLER, INLET - 21619AA030
PIPE COMPLETE - OIL COOLER, OUTLET - 21620AA060

they mount on the case as seen in the picture in the above link.
OMG OMG OMG Titter I want to give u a BIG FAT HUG MAN thank you soo soo much ....this is too good to be true.... im looking at the link but it looks like a completely different transmission case to mine ? what model number is your Transmission ? my model number is 4c-ty754vbbaa ill have to check them out to see if there similar
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Old 01-02-2017, 08:30 AM   #14
Titter
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2002 WRX Wagon
EJ207 Spec C 4EAT

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mine is TV1A4YN1AA

the link is bookmarked to my 2002 wagon. just goto the homepage of that link and input your make and model (or even input your vin). if should be in the same section. Transmission - Automatic. AT, TRANSMISSION CASE. FITTING.

they might look different on your case, and might be in a different location. but to my recolection, every automatic transmission since the 60's has had some sort of oil cooler, and there has to be some sort of pump to flow that oil.

Last edited by Titter; 01-02-2017 at 08:40 AM.
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Old 01-02-2017, 10:45 AM   #15
Titter
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EJ207 Spec C 4EAT

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i just noticed your other thread and you're trying to put an oil cooler on a manual transmission.

this information i posted is for automatic transmissions only. gear oil is incredibly viscous compared to atf oil and would even be difficult to move through an oiling system. you would need some custom made heavy duty pump for the oil system. im not even sure they exist outside of motorsport applications.

Last edited by Titter; 01-02-2017 at 11:22 AM.
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Old 01-03-2017, 12:36 AM   #16
whiterabbitrexy
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Titter Thanks for pointing that out about Trans coolers only for Autos..... i guess i better Bite the Bullet and just change my gearbox oil every 10 thousand km ..... thanks Titter heaps for pointing that out.... much thanks to you brother
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Old 01-03-2017, 07:14 AM   #17
Titter
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2002 WRX Wagon
EJ207 Spec C 4EAT

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np dude! just helping ppl the same way i have been helped in the past.
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Old 11-05-2017, 10:39 PM   #18
Standish
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Join Date: Nov 2017
Subaru Stars Forester

Quote:
Originally Posted by Titter View Post
This is on a 2002 WRX Wagon with a JDM Lightweight Front Bumper Beam, but should apply to any GD chassis equipped with a 4EAT.

My Radiator went and I decided to get an all aluminum racing rad but most of them do not have the transmission oil cooler built in for the 4EAT Automatic Transmission.

So what do you do? Well... add one! It is quite simple. Here let me show you. There are a few of these write-ups out there but most have expired pictures and whatnot. Plus i did something a little different with the cooler core placement.

Any old oil cooler core will do. Pick your favorite brand & model. I won't clutter anything up debating Tube & Fin VS Stacked Plate cores, there is a ton of that out there on the interweb.

I chose a B&M Super Cooler. I have one currently on my engine oil cooler and it seems to do the job nicely and was only $100 so i grabbed another one.


You will also need fittings. These are Aeroquip brand. I used 90 -8AN Fittings and 1/2 NPT to -8AN Adapters, and of course grab yourself some braided hose. -8AN Braided Hose is the same internal diameter as the OEM soft rubber trans lines and will slide perfectly right over the stock transmission hard lines under the battery.


So here is where we are going to mount the cooler, behind the fog light on the driver's side. I will explain why along the way.


Cut away the plastic to reveal the transmission cooler lines.


Make yourself some brackets out of whatever scrap metal you have laying around. I used some left over bits of aluminum. The bracket at the back needs to be bent 90 to properly support the cooler core. The other one can be whatever shape you need to fit.


Now here is where we get fancy. Some of you are probably thinking that you will not get proper airflow to the cooler core with it stuffed into the fender well like this. Well, thankfully, Subaru has you covered. The OEM Brake duct that Subaru engineers for your brakes needs to be modified into a sort of "Air-Ramp" (also called a louver).


As you see, there is plenty of space for air to pass to the brakes but still have some air re-directed up above to the cooler core. The plastic "ramp" is held down by pop rivets (i put a zip-tie and a few more rivets in there after i took the pic)


Mount the cooler. Pre-install the 1/2 NPT to -8AN fittings. Make sure you mount it far back enough that it clears the bumper when you put it back on. Also ensure it is on enough of an angle to have clearance between the cooler and the wheel well.


Install your new freshly made lines. You can measure to length before hand or you can measure on the car, which ever you find easiest. If you need to know how to make AN lines, just google it. Summit Racing has a nice how-to on the topic.


Slide the hose on to the ends of the OEM transmission cooler lines and clamp them down. I used two clamps just because I am paranoid. As mentioned, the -8AN braided line is a perfect fit.

Newbie here...

I'm Building a trail/camping rig and I was wondering if this would help me out climbing through the mountains and would this placement work on an 08 forester?


Thanks
Miles
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Old 11-06-2017, 06:43 AM   #19
Titter
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Member#: 416107
Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default 4EAT Transmission Cooler Install

definitely will help in the mountains. but sorry, no idea about fitment in a forester. you could always pull the car apart and check for yourself.

good luck!
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Old 11-07-2017, 11:50 PM   #20
Standish
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Quote:
Originally Posted by Titter View Post
definitely will help in the mountains. but sorry, no idea about fitment in a forester. you could always pull the car apart and check for yourself.

good luck!
thanks Titter, just thought i would ask before i dug around.
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Old 02-15-2019, 05:17 PM   #21
CBDslappy
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bump
what happened to the install pictures?
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Old 02-15-2019, 09:38 PM   #22
Fierysun
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2003 EJ207 S204 Wagon

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Quote:
Originally Posted by CBDslappy View Post
bump
what happened to the install pictures?
Don't be lazy, you can figure it out.
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Old 02-16-2019, 07:06 PM   #23
CBDslappy
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Quote:
Originally Posted by Fierysun View Post
Don't be lazy, you can figure it out.
I feel that on a spiritual level butttt id like to have a good idea how to do it and what exactly ill be looking for before I dive into it. can't find any post with pictures in 2019 thus I asked

Last edited by CBDslappy; 02-16-2019 at 07:09 PM. Reason: typo
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