External Transmission cooler?

[Turbo_Bimmer]

fmugur, teknik_ranger, FYI, I tested my transmission last year going to work (50km) and got lower temperatures than fmugur's.
Mine is a 6spd though, so may be that is the reason for the difference.

I tested it with Inpa and got a stable reading of 86°C (187°F) after driving 40 minutes. I tested it in summer and winter and got the same readings.

I did the same test this summer towing my racecar on highway with several uphills, but I can't find the data right now. If I find it, I will edit this post.

[fmugur]

Thanks TB, If I didn't hook up the oil lines backwords than I will have to insert a tranny cooler as civdiv did.
I need somebody to clarify the inlet/outlet. The heat exchange thermostat is brand new as well.

[HPIA4v2]

Originally Posted by fmugur

Thanks TB, If I didn't hook up the oil lines backwords than I will have to insert a tranny cooler as civdiv did.
I need somebody to clarify the inlet/outlet. The heat exchange thermostat is brand new as well.

well, as long you know the direction of flow, you know which is hotter than the other, cause the trans fluid leaving the cooler suppose to be @coolant temp (or cooler than the other line).

I wonder if replacing radiator will actually doing what bigger trans cooler will do (oxidized alum as well as crud build-up inside the radiator logically conducts less heat transfer, just a thought).

[fmugur]

TB, what was your engine temperature then? I think yours should be somewhere close to what I got. I know 108 C is the optimal running temp for my 4.4 engine.

[Turbo_Bimmer]

Originally Posted by fmugur

TB, what was your engine temperature then? I think yours should be somewhere close to what I got. I know 108 C is the optimal running temp for my 4.4 engine.

From memory, my engine temperature is like 2 degrees lower than the transmission. The only time it goes to 100 or more, is on very hot summer days, or when I tow and drive 120kmh. Just going to work in normal traffic, it is around 82 - 84°C.

[fmugur]

Originally Posted by Turbo_Bimmer

From memory, my engine temperature is like 2 degrees lower than the transmission. The only time it goes to 100 or more, is on very hot summer days, or when I tow and drive 120kmh. Just going to work in normal traffic, it is around 82 - 84°C.

I am a bit confused. I know m62 and n62 have the operating temperature at about 108C. Does the 4.8 run at the same temp as the 3.0 ?

[civdiv99]

What are you confused about?

[fmugur]

Originally Posted by civdiv99

What are you confused about?

Is the 4.8 running cooler than 4.4? I was under the impression they would both run at around 108C. It looks like TB runs much lower than us.

[fmugur]

The heat exchanger controlls the tranny's temp and I guess I can figure it out which line is in and which one is return. The outer temperature from the heat Exchanger should be warmer when the engine/tranny are cold but after that it's hard to tell just a few degrees. It does matter how I connect the lines to the heat exchanger for efficiency but really that much?
I am thinking that the problem might be the heat exchanger itself. Clogged maybe? Lost efficiency?

[amacman]

There are aftermarket heat exchangers available which look similar to the original .
I found some biofuel heaters which may be an easy fit in a sort of piggy back fitment with the original .
Best do your own research as to suitability .

HEAT EXCHANGER biofuel veg vegetable cooking oil SVO | eBay