does anybody have an idea on what's the normal running temp for the stock trannys? Well, when i drive it normal without hitting boost it slowly gets to 195-200, but if i'm running it hard it gets to 210 and some times a little over. I have a b@m tranny cooler coming to me on monday and how well is it going to cool the tranny, by 10 degrees or something like that, just wanted to know. Thanks, guys, MIC.

 

I remember 176 degrees for some reason. I think that was the low end of the range.

 

what size is the cooler that you are putting in?

 

it's one size bigger then the smallest b@m supercooler, i think thats what it's called?

 

Any update on your temps?

 

sounds on the high side, hight temps is a biggest enemy of auto trannys i'm sure you heard this one before. So that said get the one from Jeggs with a fan on it cheap $200 insurance.

 

From what I understand, he has one already. I'm curious to see what his temps are with the 13,000btu cooler in place. Should be a good reference point for everyone. I have a larger cooler in my garage, but for the majority of my driving, I'm thinking it will be oversized. Especially when the temperature drops in a couple of months.

 

According to the service manual:

Normal A/T fluid operating temp is 122 to 176. Seems really low, glad I already have a cooler.

 

yeah, i have the tranny cooler in place with a fan, for the temp, it sits around 190-195 on hot days(90-up), besides that it slowly gets to 180-185. Also, i have the tranny cooler sitting in front of the radiator, sort of by the grill.

 

Would you say it knocked off about 15-20 degrees then?

Did you put this inline with your stock cooler, or did you remove the little stock cooler?

Is this under WOT/cruise or idle that the temps are going up?

 

no, maybe about 10 degrees improvement under normal driving, but when i get on it, it still heats up pretty good, around 210, but with the fan, the tranny temp. cools down fairly quick and it goes in line with the stock tranny cooler. the tranny cooler helps a little, but i think the reason for the improvement is the placement of the cooler and the fan pushing air through it.

 

Thanks for the update. Some auto Supras add several coolers inline, but I can't recall anyone of those guys actually providing temps. It's always nicer to have threads that people can go back to and pull out useful information from. I ended up buying a temp guage last week because I wanted to see some comparison numbers on the Aristo. Unfortunately, I went to put the gauge in without the cooler, but the fittings with the kit were the wrong size. So, I ended up putting the cooler in without the gauge. Unfortunately I won't be able to provide anyone with 'before' temps, but I'll come back and post some after temps when I can (which line do you have your temp sensor on?).

What I've installed now - 20,500 btu universal B&M cooler. This cooler can be used for oil, trans fluid, dif, etc.. It doesn't have a bypass when the fluid is cool, so it should be partially or just covered on cooler days. Just like any cooler, it will give the transmission slightly more fluid capacity, and depending on which way you plumb the hoses, it should take a little heat load off of the radiator.

Initial impression without the gauge is that the fluid takes a lot longer to warm up. I was trying to check 'hot' fluid level after a quick trip down the highway, and I had to add a couple of WOT runs to get it to warm up enough.

As for acceptable temps, the normal operating temp in the factory manual won't be the same as the peak temps you'll likely see on the road. Low 200Fs it should survive, but it won't make it 200,000 miles at that temp. 230-250F is causing wear on more components/seals and anywhere in the 250-300 range I think you're probably looking at emminent failure fairly quickly.

 

my tranny temp. never has gone pass 210-215 at all, well thats what my tranny temp gauge tells me(i installed temp sensor onto the tranny pan). Are you running a fan with your cooler, cause that really does help.