Re: Trans temp
[Re: A727Tflite]
#2511340
06/21/18 02:59 PM
06/21/18 02:59 PM
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Joined: Dec 2005
Posts: 11,706 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,706
Fulton County, PA
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The hottest fluid is the line from the converter to the cooler. The cooler fluid is the return line.
Think turbo intercooler.
The trans sees the return line fluid temp - not the converter to cooler temp. Very little fluid from the converter gets pumped directly in to the trans.
True. Oil returns to the trans from the cooler and is routed through the lube circuit in the rear of the trans, then falls to the sump along with oil being shed by internal components. Oil in the cooler lines has either been heated by the converter or cooled by the cooler. Oil in the sump has been returned from internal use and is being picked back up by the pump. Just like an engine with the sensor in the pan or dry sump tank, I want to know the temperature of that oil in the trans.
If the results don't match the theory, change the theory.
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Re: Trans temp
[Re: DusterKid]
#2511376
06/21/18 04:06 PM
06/21/18 04:06 PM
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Joined: Jan 2003
Posts: 19,384 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,384
Las Vegas
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I'll stick with knowing what the actual oil temp is in the pan. Afterall that's where the fluid being circulated is coming from.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Trans temp
[Re: Al_Alguire]
#2511408
06/21/18 05:07 PM
06/21/18 05:07 PM
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Joined: Jan 2003
Posts: 25,988 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,988
Rio Linda, CA
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A guy I know, with a Chevy 454 TH400 dualie pickup, placed numerous temp senders in various parts of the system and hooked them to s single gauge through a rotary switch to monitor the temps while towing; wish I woulda written down the numbers cause now I have CRS.
The INTERNET, the MISinformation superhighway
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Re: Trans temp
[Re: moparx]
#2511749
06/22/18 02:23 PM
06/22/18 02:23 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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My thinking is the tranny operates on the fluid that is sucked up from the filter correct? Not from the converter If you want to know the fluid temp coming out of the converter and then when it comes out of the cooler measure both
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Trans temp
[Re: DusterKid]
#2511782
06/22/18 03:37 PM
06/22/18 03:37 PM
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Joined: Dec 2005
Posts: 11,706 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,706
Fulton County, PA
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Most of the heat in a transmission is from the converter. Converter design, stall speed and slippage, sprag or not, etc. effects it. How you run the car, foot or transbrake, 2-step or not, etc.,is the biggest influence.
Why monitor trans temp? Just to try to avoid or detect damage? Change the dial according to how hot the oil is? Or to try to maintain a specific temperature for consistency?
The oil coming from the converter is what it is and usually spikes on the starting line when it's slipping the most. I don't know anyone who monitors just that. Bracket racers may monitor the trans temps with a sensor in the pan and adjust the dial or throttle stop accordingly. But some of the guys who bracket and .90 race seriously, monitor oil temps in the engine and the trans, and have heaters and coolers for both so they go into the water at the same temp - or as close as possible - from the first run of the day to the last.
Last edited by CMcAllister; 06/22/18 03:43 PM.
If the results don't match the theory, change the theory.
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Re: Trans temp
[Re: DusterKid]
#2511799
06/22/18 04:10 PM
06/22/18 04:10 PM
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Joined: Oct 2007
Posts: 4,212 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,212
New York
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Slightly O/T: is the ATF pick-up uncovered when the front wheels are airborn? It's certainly a concern for engine oil.
Boffin Emeritus
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Re: Trans temp
[Re: DusterKid]
#2512051
06/23/18 07:45 AM
06/23/18 07:45 AM
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Joined: Jan 2003
Posts: 2,937 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,937
A shed in England
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Since my deep pan didn't have provision for a temp sensor I monitor the line temp from the converter. At first I wasn't sure this was the best place for it. It sure goes up quick making a pass and the 8 in converter makes for more heat than the 9 1/2 in converter that I've tried in my current 580 combo. Obviously this is due to more slippage. I'm guessing if the converter started to go bad, temps would increase 60ft would drop off, trap rpm would increase etc. If one were to log such data it's just another tool in the arsenal for comparison and would help to identify any issues occuring in the entire package we call a race car
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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