AT Trans Flow/Pressure Cooler lines
01-07-2022 | 01:36 PM
#16
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Joined: Jun 2019
Posts: 2,605
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From: South Florida
25min drive to work, mostly freeway.
45F outside ambient temp
Temps all started at 63F (garage temp)
transmission had just hit 120F as I was parking after 25min drive.
Oil hit 170F today in about 12mins when Trans was at about 98F and oil hit about 185F as I was parking IIRC.
Definitely concerning especially for the added stress when making boost, wouldn't be surprised if this was a big contributing factor for all the boosted AT trans failures once boosted.
I imagine most people when boosted are monitoring oil temps and once they hit a certain desired oil temp start making pulls, but might not be monitoring trans temps, chances are the trans is still very cold. Typical ideal trans operating range is similar to most engines 170-220F, ATF fluid I believe has a slightly wider range compared to engine OIL especially on the colder side so 140F is probably a safe temp to start doing pulls.
Curious anyone else's trans temp warmup times.
45F outside ambient temp
Temps all started at 63F (garage temp)
transmission had just hit 120F as I was parking after 25min drive.
Oil hit 170F today in about 12mins when Trans was at about 98F and oil hit about 185F as I was parking IIRC.
Definitely concerning especially for the added stress when making boost, wouldn't be surprised if this was a big contributing factor for all the boosted AT trans failures once boosted.
I imagine most people when boosted are monitoring oil temps and once they hit a certain desired oil temp start making pulls, but might not be monitoring trans temps, chances are the trans is still very cold. Typical ideal trans operating range is similar to most engines 170-220F, ATF fluid I believe has a slightly wider range compared to engine OIL especially on the colder side so 140F is probably a safe temp to start doing pulls.
Curious anyone else's trans temp warmup times.
You do bring an important point on awareness of spirited driving upon start up. Most folks go off coolant operating temp however trans might take a while to get ready.
01-07-2022 | 02:25 PM
#17
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Joined: May 2021
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Last time I checked mines I believe it took 15 minutes to hit 130-140k. External cooler with tstat in 80F weather.
You do bring an important point on awareness of spirited driving upon start up. Most folks go off coolant operating temp however trans might take a while to get ready.
You do bring an important point on awareness of spirited driving upon start up. Most folks go off coolant operating temp however trans might take a while to get ready.
more acceleration, higher rpm, and frequent gear changes will speed up warm up times.
for 20 of the 25mins I was sitting at a constant 2200rpm 7th gear entire time, so doesn’t do any favors for warm up.
01-07-2022 | 02:41 PM
#18
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From: South Florida
I would say 25-30 miles of 60% highway.
02-28-2022 | 09:21 AM
#19
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Joined: May 2021
Posts: 190
Likes: 61
Finally got around to installing a heat exchanger and external pump.
Since my original posts I have continued to monitor trans temp everyday / drive.
Originally because I was in the process of tuning and post tune monitoring I was using Ecutek to monitor trans temp. I believe this is measuring temp in the trans pan and so is a bit colder.
My scangauge II's PID is for the other trans temp sensor which is post torque converter so it gets hotter faster.
Before, my commute to work in 45F ambient it would hit 120F once I parked according to ecutek so trans pan temp.
After, I drove in 27F ambient (coldest I've driven this car yet) and trans temp hit 135F when I parked according to ecutek, so trans pan temp.
I will get more data later though for more comparison in same temps.
Before, with scangauge II post torque converter temp It would hit 135F when I parked in about 45-50F ambient.
After, it hit 165F in 45F-50F ambient.
Pretty substantial improvement, considering how much more energy is required to continuously heat up the fluid as it gets hotter and hotter, IE the time it takes to go from 60F-100F happens in no time, while the time to go from 100F-140F takes a lot longer. Adding 30F of temp to the "hot" fluid is pretty good in my opinion.
The time to hit about 115-120F trans pan or 130-135F post converter seems to be about 10-12mins quicker or right around the time my Oil is hitting 170s.
Those are temps I can live with for starting to make some pulls.
Since my original posts I have continued to monitor trans temp everyday / drive.
Originally because I was in the process of tuning and post tune monitoring I was using Ecutek to monitor trans temp. I believe this is measuring temp in the trans pan and so is a bit colder.
My scangauge II's PID is for the other trans temp sensor which is post torque converter so it gets hotter faster.
Before, my commute to work in 45F ambient it would hit 120F once I parked according to ecutek so trans pan temp.
After, I drove in 27F ambient (coldest I've driven this car yet) and trans temp hit 135F when I parked according to ecutek, so trans pan temp.
I will get more data later though for more comparison in same temps.
Before, with scangauge II post torque converter temp It would hit 135F when I parked in about 45-50F ambient.
After, it hit 165F in 45F-50F ambient.
Pretty substantial improvement, considering how much more energy is required to continuously heat up the fluid as it gets hotter and hotter, IE the time it takes to go from 60F-100F happens in no time, while the time to go from 100F-140F takes a lot longer. Adding 30F of temp to the "hot" fluid is pretty good in my opinion.
The time to hit about 115-120F trans pan or 130-135F post converter seems to be about 10-12mins quicker or right around the time my Oil is hitting 170s.
Those are temps I can live with for starting to make some pulls.
02-28-2022 | 01:25 PM
#20
Moderador
Joined: Jun 2019
Posts: 2,605
Likes: 738
From: South Florida
Finally got around to installing a heat exchanger and external pump.
Since my original posts I have continued to monitor trans temp everyday / drive.
Originally because I was in the process of tuning and post tune monitoring I was using Ecutek to monitor trans temp. I believe this is measuring temp in the trans pan and so is a bit colder.
My scangauge II's PID is for the other trans temp sensor which is post torque converter so it gets hotter faster.
Before, my commute to work in 45F ambient it would hit 120F once I parked according to ecutek so trans pan temp.
After, I drove in 27F ambient (coldest I've driven this car yet) and trans temp hit 135F when I parked according to ecutek, so trans pan temp.
I will get more data later though for more comparison in same temps.
Before, with scangauge II post torque converter temp It would hit 135F when I parked in about 45-50F ambient.
After, it hit 165F in 45F-50F ambient.
Pretty substantial improvement, considering how much more energy is required to continuously heat up the fluid as it gets hotter and hotter, IE the time it takes to go from 60F-100F happens in no time, while the time to go from 100F-140F takes a lot longer. Adding 30F of temp to the "hot" fluid is pretty good in my opinion.
The time to hit about 115-120F trans pan or 130-135F post converter seems to be about 10-12mins quicker or right around the time my Oil is hitting 170s.
Those are temps I can live with for starting to make some pulls.
Since my original posts I have continued to monitor trans temp everyday / drive.
Originally because I was in the process of tuning and post tune monitoring I was using Ecutek to monitor trans temp. I believe this is measuring temp in the trans pan and so is a bit colder.
My scangauge II's PID is for the other trans temp sensor which is post torque converter so it gets hotter faster.
Before, my commute to work in 45F ambient it would hit 120F once I parked according to ecutek so trans pan temp.
After, I drove in 27F ambient (coldest I've driven this car yet) and trans temp hit 135F when I parked according to ecutek, so trans pan temp.
I will get more data later though for more comparison in same temps.
Before, with scangauge II post torque converter temp It would hit 135F when I parked in about 45-50F ambient.
After, it hit 165F in 45F-50F ambient.
Pretty substantial improvement, considering how much more energy is required to continuously heat up the fluid as it gets hotter and hotter, IE the time it takes to go from 60F-100F happens in no time, while the time to go from 100F-140F takes a lot longer. Adding 30F of temp to the "hot" fluid is pretty good in my opinion.
The time to hit about 115-120F trans pan or 130-135F post converter seems to be about 10-12mins quicker or right around the time my Oil is hitting 170s.
Those are temps I can live with for starting to make some pulls.
02-28-2022 | 01:55 PM
#21
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Registered Member
Joined: May 2021
Posts: 190
Likes: 61
I know you saw already, but its in my build page.
https://www.myg37.com/forums/build-t...ted-build.html
https://www.myg37.com/forums/build-t...ted-build.html
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