E153 Transmission Cooler Now Available - MR2 Owners Club Message Board
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post #1 of 16 (permalink) Old March 7th, 2019, 08:40 Thread Starter
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E153 Transmission Cooler Now Available

I recently finished developing a bolt-on transmission cooler kit for the e153 transmission to address high transmission temperatures that I have been seeing at track days (I have seen up to 250f personally).

This could also be used as a mounting bracket for a small engine oil cooler for those who don't want to give up their stock intercooler location.





More info on my website: https://wilhelmraceworks.com/transmission-cooler

These will be shipping in about a week, as soon as I receive an order of lines and fittings.
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post #2 of 16 (permalink) Old March 7th, 2019, 15:53
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Nice. Have you monitored how much would this unit drop the temps?
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post #3 of 16 (permalink) Old March 8th, 2019, 10:16 Thread Starter
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I don't have any data yet with it installed, but I will definitely get some this summer.


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post #4 of 16 (permalink) Old March 8th, 2019, 10:34
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Sweet stuff.

Are you using the Earl's 21000A cooler?
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post #5 of 16 (permalink) Old March 8th, 2019, 10:34
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Also - what metric size are the fittings in the trans itself? I'm assuming they're just typical straight thread metric like an M14x1.5 or something.
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post #6 of 16 (permalink) Old March 8th, 2019, 12:04 Thread Starter
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Quote:
Originally Posted by DefSport View Post
Sweet stuff.

Are you using the Earl's 21000A cooler?
Yes

Quote:
Originally Posted by DefSport View Post
Also - what metric size are the fittings in the trans itself? I'm assuming they're just typical straight thread metric like an M14x1.5 or something.
Also yes, M14x1.5. The stock fittings have an O-ring, and there is an O-ring groove in the transmission, but at the moment I'm just sealing mine with a crush washer. Probably could omit the crush washer and put a new O-ring in there instead. Unfortunately metric O-ring boss to AN adapter fittings are unobtanium as far as I can tell.


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post #7 of 16 (permalink) Old March 9th, 2019, 09:59
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Awesome! Definitely appreciate the continued development for the MR2. And that would be a slick placement for an engine oil cooler.

Apologize for the potentially dumb question but how does fluid circulate through the cooler? Just via pressure/use of the transmission itself? I would have assumed there would be a need to pump or circulate fluid around somehow?
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post #8 of 16 (permalink) Old March 9th, 2019, 10:12 Thread Starter
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Apologize for the potentially dumb question but how does fluid circulate through the cooler? Just via pressure/use of the transmission itself? I would have assumed there would be a need to pump or circulate fluid around somehow?
Not a bad question at all. The e153 is fairly unique (and awesome) in that it has a built in gerotor pump driven by the ring gear. So fluid is pumped through the cooler and the rest of the transmission whenever the car is moving, regardless of if the car is in gear or not.


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post #9 of 16 (permalink) Old March 9th, 2019, 23:09
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Not a bad question at all. The e153 is fairly unique (and awesome) in that it has a built in gerotor pump driven by the ring gear. So fluid is pumped through the cooler and the rest of the transmission whenever the car is moving, regardless of if the car is in gear or not.


Sweet, thanks! I'll add this to the to do list later down the road. Would love to see some data when you get a chance.
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post #10 of 16 (permalink) Old March 13th, 2019, 17:55
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Thats cool! How much power are you putting through your transmission and what problems are you seeing at those temperatures?
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post #11 of 16 (permalink) Old March 13th, 2019, 19:14
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Just because I borderline stalk Alex's build - he is making ~290 rwhp on an NA 2GR-FE.
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post #12 of 16 (permalink) Old March 14th, 2019, 07:26
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Yes


Unfortunately metric O-ring boss to AN adapter fittings are unobtanium as far as I can tell.
Is this what you're looking for? -6 x 14-1.5mm. This guy makes adaptors in-house so I'm sure he can fab up whatever you need. I bought a few of these for an EHPS conversion, but haven't gotten around to that so I can't speak to his quality. He's got tons of other adaptors in his store so check it out!
https://www.ebay.com/itm/6-x-14-1-5m...sAAMXQyY1TWCsq

Last edited by PizzaGuy01; March 14th, 2019 at 07:28.
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post #13 of 16 (permalink) Old March 14th, 2019, 15:00 Thread Starter
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Thats cool! How much power are you putting through your transmission and what problems are you seeing at those temperatures?
Like def said, it's about 290whp at the moment. Power is of course a factor, but it's more the usage that matters. A 500hp street car probably doesn't need a transmission cooler. A 200hp track car (road race) probably could use one.

I haven't personally seen any issues yet other than seeing temps higher than I am comfortable with, but a number of people who endurance race these cars have had issues keeping the transmission alive through an entire race (synchro failure the usual problem), and the best theory anyone has is that it's temperature related. I know Bill Strong runs a large cooler on his race car and it has improved on his transmission issues. Given the cost of the e153 these days, and the lack of availability of rebuild parts, I figure a little preventative is a good idea.

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Originally Posted by PizzaGuy01 View Post
Is this what you're looking for? -6 x 14-1.5mm. This guy makes adaptors in-house so I'm sure he can fab up whatever you need. I bought a few of these for an EHPS conversion, but haven't gotten around to that so I can't speak to his quality. He's got tons of other adaptors in his store so check it out!
https://www.ebay.com/itm/6-x-14-1-5m...sAAMXQyY1TWCsq
I buy some aluminum weld on fittings from him for 2GR intakes. He makes nice parts. Those aren't exactly what is needed for the transmission though.


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post #14 of 16 (permalink) Old July 12th, 2019, 20:22
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Just wondering how this set up has been treating you and if you've had some data before and after the install.

I was re-looking at the set up... I'm trying to see if there is a way to mount up an oil cooler and trans cooler using this bracket as a base (or something along those lines). I have a SMIC so giving that space up isn't an option for me. Any ideas there?
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post #15 of 16 (permalink) Old July 15th, 2019, 11:34
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Awesome contribution to the community!
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post #16 of 16 (permalink) Old July 25th, 2019, 19:09 Thread Starter
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Originally Posted by Rocket3004 View Post
Just wondering how this set up has been treating you and if you've had some data before and after the install.

I was re-looking at the set up... I'm trying to see if there is a way to mount up an oil cooler and trans cooler using this bracket as a base (or something along those lines). I have a SMIC so giving that space up isn't an option for me. Any ideas there?
So far so good. Temps at the last track day peaked at 227f, so that's a ~23f reduction. Also worth noting that I added a rear diffuser and an under panel under and around the transmission, so the transmission is receiving much less cooling than it did before, I imagine temps would be quite a bit lower without that. But this was part of my plan all along, and was part of the reason I wanted to add the cooler to the transmission.

Temps on the highway are higher than I feared (I forget the exact number, but I want to say I saw 160-180 last time I checked). So it doesn't seem to be over cooling either. But of course, the lack of airflow around the transmission in my case has an effect on that as well.


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