Gauge or Obd Trans Temp ?
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Freshman User
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Gauge or Obd Trans Temp ?
Installed a 3 gauge piller mount glow shift max tow gauge set. the trans temp from the gauge is 20 deg off lower than the ecm reading. With the stock tranny being soo sensitive to temp which reading should I use. I know , but 20deg does matter, Right. or am I being to ****.
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
I have a laser thermometer for things like this. I aim around under there, looking at all the different parts of the vehicle I can access externally. I can look for temps on brake rotors, fluids, bearings, U-joints, etc....
You might be able to settle the dispute between the gauges with that third opinion, but it's still a good question on the forum for those in-the-know about transmissions. Sadly, I know next to nothing about the inner-workings of the device that takes all the oomph from a 7.3L and puts it to the wheels.
You might be able to settle the dispute between the gauges with that third opinion, but it's still a good question on the forum for those in-the-know about transmissions. Sadly, I know next to nothing about the inner-workings of the device that takes all the oomph from a 7.3L and puts it to the wheels.
Laughing Gas
Joined: Apr 2011
Posts: 851
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Installed a 3 gauge piller mount glow shift max tow gauge set. the trans temp from the gauge is 20 deg off lower than the ecm reading. With the stock tranny being soo sensitive to temp which reading should I use. I know , but 20deg does matter, Right. or am I being to ****.
My isspro evo2 gauge matches my areoforxe gauge ecm trans temp reading almost perfectly.
You might have a bad sending unit...
Post Fiend
Joined: Sep 2006
Posts: 7,426
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From: Sioux Falls, SD
It's pretty normal/common to see a difference in the two readings. I wondered the same a few years ago when I noticed it in my F-250. The gauge is reading from the test port on the passenger side of the tranny and the PCM is reading from the internal sensor.
From Mark K.
From Mark K.
Mountain Pass
Joined: Apr 2012
Posts: 142
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From: Nashville TN
I see the same
With my autometer trans temp gauge I see the same as you are reporting. When using the torque app the two are exactly 20 degrees different. my concern was that the PCM's reporting temp is always 20* higher than the analog.
Senior User
Joined: Sep 2013
Posts: 498
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From: Hagerstown, MD
My AutoMeter trans temp gauge and DP Infinity show about a 20* difference as well.
I saw a post by Mark K. in my travels where he stated that the stock sensor was very accurate, it's just the in-dash gauge that isn't. So, I usually go off of the PCM reading.
I saw a post by Mark K. in my travels where he stated that the stock sensor was very accurate, it's just the in-dash gauge that isn't. So, I usually go off of the PCM reading.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
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From: SE Florida
It's pretty normal/common to see a difference in the two readings. I wondered the same a few years ago when I noticed it in my F-250. The gauge is reading from the test port on the passenger side of the tranny and the PCM is reading from the internal sensor.
From Mark K.
From Mark K.
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So I should go with the higher temp.
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So I should go with the higher temp.
Super Moderator
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- Which gauge is easier for you to monitor and understand at a glance?
- Which gauge is easer to read/see at night?
- Which gauge is easier to read/see during the day?
- Can the Aeroforce be set to automatically inverse the LCD when the lights are turned on?
- Can the Aeroforce illumination be dimmed in concert with the rest of the IP illumination?
The decision about which gauge to use should factor in the ergonomics of being able to monitor the data in all driving conditions, with as little driver involvement as possible. The readability issues might be more important than small temperature differences, because if it is too much of a hassle to see or understand the gauge at a glance, then the length of time the transmission is operating at an elevated temperature without the operators awareness might be worse than a lower reading that is easily seen and instantaneously comprehended.
Super Moderator
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The transmission pumps fluid at about 1.2 gallons per minute.
Therefore, in less than 2 minutes, that extra 9 quarts will all get pumped thru the heat generating torque converter and get just as hot as the rest of the fluid.
By contrast, the 6.0 tranny cooler in your sig is an effective means of REMOVING heat from the fluid, not just delaying for a couple minutes how hot all the fluid gets.
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