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2016 GT Removed 6R80 internal thermostat

Old 06-07-2019, 04:16 AM
  #1  
R5000si
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Default 2016 GT Removed 6R80 internal thermostat

I had the 6R80ís internal thermostat removed and left nothing in place where the thermostat lives. I added the large Mishimoto tranny cooler to replace the stock cooler. This Mishimoto cooler is over double the size of the Ford cooler that is mounted in between the condenser and radiator. That means the tranny oil will immediately circulate to the cooler without restrictions on startup and full circulation until I turn off the engine. This had no effect on how the tranny shifts in other words it shifts normal through all the gears even to 6th gear with cold oil. It shifts as quickly from 1st to 2nd to 3 thru 6 when it needs to shift driving casually and the 6R80 shifts hard and fast through the gears under wide open throttle. In sport mode it shifts with the paddle shifter up and down the gears like before when the thermostat was installed. Believe it or not the tranny works exactly the same without the thermostat. Also not once did it through a code when the oil was cold or warm ever because I own a autel MX 808 I use to check for trouble codes. I say warm because no longer does the tranny oil get hot. In summer the oil got up to 220. Now driving the GT hard in summer it got up to 200. In the winter it would get up to 185 was highest but usual 180. I had this done last year to make sure what Iím saying is good so Iíve been testing while drive my 2016 GT California Special that I bought brand new. I did this because I wasnít happy with how hot the tranny oil got. Now this could be just a quirk of mine or it could be I just got bored one day and decided to see if I could help the tranny to run cooler. I not recommending anybody else do this Iím just commenting on what Iím doing to my car. By the way Iím talking about San Diego weather and itís affect on the car.
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Old 06-08-2019, 03:54 AM
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Derf00
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It won’t hurt anything to remove it. In fact you could be avoiding a catastrophic failure from the valve getting stuck closed and burning up the trans.

ive run my 08 5r55s without a thermostat for three years before I blew the trans from an unrelated item. When I got the new trans and valve body in, I again removed the thermostat and have been running it for two years like that. Again, no problems. I live in the Phoenix az area so we get a little toasty here in the summer.

I haven’t check the trans fluid temps before/after so there’s no data to say what’s changed in that regard. I just figured since I was in there adding shift enhancements to the valve body, I would update that as well to keep maximum fluid flowing at all times.
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Old 06-08-2019, 04:26 AM
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R5000si
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That’s a good point about avoiding possible damage from a stuck thermostat. Today’s cars are designed to run as hot as possible not because it’s good for the car. It’s because the EPA wants to control emissions and one way to do that is to run the running gear of a car at the ragged edge. The coolant system the combustion chamber engine oil and even the auto tranny oil as hot as possible. The EPA doesn't give a hang about longevity of the running gear which is shortened in my opinion by the high temps cars run at.
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Old 06-10-2019, 05:27 PM
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Derf00
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Originally Posted by R5000si View Post
Thatís a good point about avoiding possible damage from a stuck thermostat. Todayís cars are designed to run as hot as possible not because itís good for the car. Itís because the EPA wants to control emissions and one way to do that is to run the running gear of a car at the ragged edge. The coolant system the combustion chamber engine oil and even the auto tranny oil as hot as possible. The EPA doesn't give a hang about longevity of the running gear which is shortened in my opinion by the high temps cars run at.
Nope, EPA could care squat about longevity or any other parameters external to "reducing emissions" . Yes the hotter temps are for the sake of improving emissions nothing more, nothing less. Heat is tranny fluids #1 enemy and why the change interval for automatic and DSG fluid is between 30K-40K miles
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Old 06-10-2019, 08:00 PM
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R5000si
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I look at controlling emissions in a combustion engine very complicated. The benefit to high temps in a combustion chamber is to control nox2 ( oxides of nitrogen ). To aid the control back in the 1970ís the average coolant thermostat was 160 it was bumped up to 192 to help increase combustion temp this was the infancy period for engineering the control of smog. Back then a component of smog was a brown layer of air that you would see when the smog was back lit up by the sun. This brown layer is called oxides of nitrogen and was formed in the combustion chamber at lower temps. The EPA air standards are good but in my opinion sometimes they go a little overboard like put a thermostat in the 6R80 to make it run hotter. Thatís the biggest enemy of any transmission what it needs is to be helped to run cooler. I donít see any benefit for emissions to make it run hotter.
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Old 06-14-2019, 02:10 AM
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R5000si
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Default Deep pan

I also added a deep transmission pan that added an extra 6 qts of oil. And along with the pan an external flex housing dip stick tube was included. Which makes filling the transmission and checking the oil level a breeze. Instead of having to have access under the car and remove a miniature 6Ē dip stick. I also had drained as much Ford tranny oil when the stock pan was removed. I had in my opinion the best synthetic oil you could use in the tranny added. I like using Amsoil Iíve been using this brand for a while.
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Old 06-14-2019, 04:00 PM
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Coosawjack
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Originally Posted by R5000si View Post
I look at controlling emissions in a combustion engine very complicated. The benefit to high temps in a combustion chamber is to control nox2 ( oxides of nitrogen ). To aid the control back in the 1970ís the average coolant thermostat was 160 it was bumped up to 192 to help increase combustion temp this was the infancy period for engineering the control of smog. Back then a component of smog was a brown layer of air that you would see when the smog was back lit up by the sun. This brown layer is called oxides of nitrogen and was formed in the combustion chamber at lower temps. The EPA air standards are good but in my opinion sometimes they go a little overboard like put a thermostat in the 6R80 to make it run hotter. Thatís the biggest enemy of any transmission what it needs is to be helped to run cooler. I donít see any benefit for emissions to make it run hotter.
Hotter fluid is less viscous which should yield less Drive Train Power LOSSES and modern ATF is good to 230* F if changed fairly frequently!!
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