How Hot Is Too Hot?

In my experience they can be off by as much as 20f

 

I do have the Ultra Gauge that monitors the trans temp. But mine doesn't, I'll have to research threads on here to see if i'm programming it wrong. I program things for a living, I cant believe I don't have it programmed right. I will keep trying

 

Yep. Have to get the right version and have it pre-programmed for Toyota.

 

This is the pretty much the same numbers I've always referred to. Somewhere around 200 is about ideal, I'm not convinced lower than 200 actually helps and may hurt. Getting up to 225-250 or so for brief periods won't lead to transmission failure. It will lead to the AT fluid failure. If you reach those temps then you should service the transmission more often. If not and you continue to drive with bad AT fluid that will damage your transmission.

 

my atf is always staying a good 20-30 degrees lower than my rad temp
and when stomping it, it quickly rises 15~20 degrees but then also
quickly drops back down...atf stays cooler than water practically 100% the time

 

We pull a ~5000lbs RV around in the summer, if the ATF goes above 100C (212F) we give it a break.





I've seen Coolant temps to 110C (230F) but it goes back down pretty quick once airflow increases and you stop climbing.

 

Here's what worked for me: Ultragauge transmission temp

FWIW, the 'preprogramming' did not work for my truck so I had to change the settings to get it to work.

 

It's not the Heat in the humidity

 

Hey OP, when was the last time you have serviced your cooling system? A good flush and new fluid can increase the cooling efficiency.

 

I was just about to ask about that 2.7 when I noticed that its an 02. My 2TR-FE 2.7 very consistently reads 92^C when running, I've never seen it above 93, and never below 91. 91=195.8, 92=197.6, 93=199.4

One of the reasons why the temperature could be swinging more on a V6, is because it is closer to the radiator's capacity. The 4-cyl obviously doesn't generate as much heat, but has the same radiator. That gives the thermostat a better control over the temperature fluctuation.

I've moved ridiculously heavy loads with my 2TR-FE, and it is still very consistently sitting at 92C.

 

I've been running a ScanGuage 2 for 3 years. I programmed the trans temp about 2 1/2 years ago. When working the transmission and when the converter is unlocked, the temp rises. When cruising down the highway locked up in 5th gear it drops back down. 3 months ago I programmed the alt. trans temp. and I now run them both as 2 of the 4 gauges I can see all the time. I now realize the first one is the converter temp (or close enough) and that is why it fluctuates as it does. I named this one CTT. The second is the pan temp. (or close enough) and it doesn't fluctuate at all - only slowly rises as I drive. I named this one PTT. When working the tranny the 2 can get 30 degrees F. apart. When cruising locked up they equalize. This is very useful when towing so I can keep a close eye on temps - and yes, even when towing the 2 temps run the same when running on the level locked up in 5th. We climb from 750 meters elevation at home to 1350 where we camp regularly with most of the climb in the last 50 km. and the highest I saw was 203 CTT and 178 PTT (both read in degees F. only - no celcius option) at 22 degrees C. ambient. FYI - the highest coolant temp I've ever seen is 88 degrees C. (190 F.)on a 35 degree C. day, but I put a black metal window screen behind my grill right away after purchase and my rad looks like it did from the factory - not a mark on it or a bug in it (truck bought new in March of 2012). In August we will be towing 800 km one way over some 2000 meter passes. It will be interesting to watch temps then.

 

Hotter than hot is too hot.

 

Curious, what Alt. trans temp is? Reading your post, i'm guessing it is the "Pan Temp". Interesting, what is the setting for this "Alt. Tans Temp". I do a lot of towing, and next week I am taking a 500mile trip to Niagara Falls, from RI. I currently monitor what you describe as Converter Temp. This is very interesting

 

I tied programming this and it doesn't work on my 2013, I used 3808 and that works, but 2808 for the pan temp does not work. Do you have another RXD# that you are using

GAUGE TXD RXF RXD MTH NAME Notes
Transmission Temperature 07E02182 046105820000 3808 00090005FFD8 TFT Degrees F
Transmission Temperature (Alternative) 07E12182 046105820000 2808 00090005FFD8 TFT Degrees F

 

Not the same when your talking about metal. Humidity effects the ability for water to avaporate on human skin. Engines don't work off of evaporative cooling.

 

I know that. What just try to lighten it up a little.

 

I let the people at ScanGuage know that the TXD for the Alt. temp should be the same as the first temp but they still haven't changed the website ...
The only number that is different between the 2 is the RXD - 3808 to 2808. The TXD, RXF, and MHT should be the same - use 07E02182 for the TXD.
You will have to name them differently as well. I used CTT (converter trans. temp.) and PTT (pan trans. temp.).
You will see the converter temp fluctuate depending on how hard your working the transmission, whereas the pan temp does not.
I find watching the 2 while towing to be very useful and interesting.

 

I'm going to contact scangauge and check with them. I thought that maybe my 13 Taco doesn't support the Alt Temp?...IDK. I gotta get to the bottom of it. I set the programming up the same way as you described, and named them the same way. Odd,

 

1 - Make sure you are using a different slot for each. I only have 2 X-gauges so I'm using slot 0 for CTT and slot 1 for PTT.
2 - Make sure you are using the same TXD number for both - the website calls for 07E12182 but you need to use 07E02182.
3 - double check all your numbers - it's easier to copy the first to a different slot and then go in and change the RXD and name (since the TXD, RXF, and MHT are the same for both).

 

I upgraded my stock trans cooler with a more efficient stacked-plate style from B&M. During a recent five-hour tow (~4000# plus four passengers and gear) through ambient temps in the high 90s and some pretty good hillclimbs my trans pan temp peaked at 230 briefly, usually running closer to 190-200. Monitored both engine and trans pan temps the whole time with an Ultragauge.