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  #11  
Old 02-13-2013, 10:24 PM
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I've been eyeing the Thermal Control system and looking at my 09,,,

Unlike my prior GM's, the tranny cooler is not 'inside' the radiator, but a seperate item outside/in front of the Rad,,,

The GM's had/have a tranny cooler inside the rad to cool and warm up the oil. Later units had a small 'external' cooler added in line with the 'internal' system.

RAM goes about it a bit differently (at least in the 4th Gens), as there is (up until now) no control over the Trans temp other than 'wide open / max cooling' by the large, independent cooler in front of the Rad. Folks up north would never see their tranny's reach 'warm' temp in winter,,, ever.

I experimented with covering the trans cooler in my 09 on a Xmas trip to Iowa. Just below freezing, with 80-85% of the tranny cooler covered, and I still didn't reach 170 on the freeway. (Ram claims optimum efficiency at 190 degrees) Even with ~1/2~ of it covered with temps in the low 50's, it wouldn't reach 170,,,

On that trip, I was able to easily monitor the trans temp for a couple days. Now that I am back home, with occaisional 80 degree days and 'short daily drives' into work each day, I run 100% uncovered cooler, but i can't honestly say I've monitered the temps much since then. (Generally gets up past 140ish,,, eventually,,,,)

Would / WILL be NICE to have a system that does all the temp control for you!!!!!

More about the 8 spd:

The ZF eight-speed automatic is made in several different forms, including an AWD version and a version with a built in DynaStart electric motor, with 20 horsepower (15 kW) of power, making it into a parallel-hybrid transmission. The key advantages of the transmission are not so much the eight speeds (which help to keep the engine in its optimal range, and reduces the number of tradeoffs required in tuning), but the high efficiency a claimed 98% efficiency in any gear, with an extremely rapid locking torque converter and high speed, with shifting taking place faster than a person can perceive it.

Original is at 845RE / 8R70: ZF 8-Speed Automatic Transmission for Chrysler cars http://www.allpar.com/mopar/transmis...#ixzz2KppYrmiD
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  #12  
Old 02-14-2013, 09:21 AM
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Quote:
Originally Posted by HoustonHemi View Post
I've been eyeing the Thermal Control system and looking at my 09,,,

Unlike my prior GM's, the tranny cooler is not 'inside' the radiator, but a seperate item outside/in front of the Rad,,,

The GM's had/have a tranny cooler inside the rad to cool and warm up the oil. Later units had a small 'external' cooler added in line with the 'internal' system.

RAM goes about it a bit differently (at least in the 4th Gens), as there is (up until now) no control over the Trans temp other than 'wide open / max cooling' by the large, independent cooler in front of the Rad. Folks up north would never see their tranny's reach 'warm' temp in winter,,, ever.

I experimented with covering the trans cooler in my 09 on a Xmas trip to Iowa. Just below freezing, with 80-85% of the tranny cooler covered, and I still didn't reach 170 on the freeway. (Ram claims optimum efficiency at 190 degrees) Even with ~1/2~ of it covered with temps in the low 50's, it wouldn't reach 170,,,

On that trip, I was able to easily monitor the trans temp for a couple days. Now that I am back home, with occaisional 80 degree days and 'short daily drives' into work each day, I run 100% uncovered cooler, but i can't honestly say I've monitered the temps much since then. (Generally gets up past 140ish,,, eventually,,,,)

Would / WILL be NICE to have a system that does all the temp control for you!!!!!

More about the 8 spd:

The ZF eight-speed automatic is made in several different forms, including an AWD version and a version with a built in DynaStart electric motor, with 20 horsepower (15 kW) of power, making it into a parallel-hybrid transmission. The key advantages of the transmission are not so much the eight speeds (which help to keep the engine in its optimal range, and reduces the number of tradeoffs required in tuning), but the high efficiency a claimed 98% efficiency in any gear, with an extremely rapid locking torque converter and high speed, with shifting taking place faster than a person can perceive it.

Original is at 845RE / 8R70: ZF 8-Speed Automatic Transmission for Chrysler cars http://www.allpar.com/mopar/transmis...#ixzz2KppYrmiD
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Ford does the similar thing to GM.
The raditior portion for the transmission is at the bottom of the raditor. That is the coldest portion of the raditor at all times. Hot water in the top and cold water out the bottom. RAM is taking hot water to that heat exchanger to warm it up or cold water to cool it down.
You'll notice they even talked about the shutter closing at 10 mph. If it's winter and really cold they'll be closed most of the time.

The Bra on diesel trucks was never for Aero affect. There is so much heat in a deisel the cooling package is 3-4X larger than a gas. In the winter the raditor efficency is more than needed and there isn't enough hot water for cab heat. Thus starve the radiator.
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