ISSPRO trans temp gauge...
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Mountain Pass
Joined: Sep 2003
Posts: 143
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From: So Cal
ISSPRO trans temp gauge...
The ISSPRO trans temp gauge has been installed for several days and after a 40 min drive it only gets up to 160 degrees. In the afternoon it may get up to 170 degrees.
After a 5-10 min warmup at 56 degrees outside (overhead lie-o-meter) and 2500 max rpm getting on the freeway... set cruise at 65 and drive 32 miles to work with some moderate hills (North County San Diego to downtown on I15).
My question is... shouldn't I be getting higher readings? There are little tick marks around 180 and 260 so I would assume that would be normal operating range.
After a 5-10 min warmup at 56 degrees outside (overhead lie-o-meter) and 2500 max rpm getting on the freeway... set cruise at 65 and drive 32 miles to work with some moderate hills (North County San Diego to downtown on I15).
My question is... shouldn't I be getting higher readings? There are little tick marks around 180 and 260 so I would assume that would be normal operating range.
Junior User
Joined: Feb 2005
Posts: 53
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Sounds like we are in the same boat. If the guage is working properly, I am not complaining; the cooler the better. I haven't been able to drive far or hard yet since installing the tranny temp guage. The most it has read is about 155ish. It is the ISSPRO 140 degree guage. It takes about 10-15 min to get warm enough to even read.
How far were you able to thread the sending unit in? I didn't want to over tighten it, but I also want to be sure it is in far enough.
How far were you able to thread the sending unit in? I didn't want to over tighten it, but I also want to be sure it is in far enough.
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Mountain Pass
Joined: Sep 2003
Posts: 143
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From: So Cal
I do not believe that it was threaded in all that much. I do remember that I was concerned that the sensor portion was going that far in, but assumed it was engineered for that purpose and that is what the hole is there for.
I believe I had sufficient thread engagement to know it was not going to come out but I had the same thought when I tightened it up... thinking to not crank on it and screw up the case.
Anyone know what the normal operating tempurature for the 2004 PSD auto trans would be?
I believe I had sufficient thread engagement to know it was not going to come out but I had the same thought when I tightened it up... thinking to not crank on it and screw up the case.
Anyone know what the normal operating tempurature for the 2004 PSD auto trans would be?
Senior User
Joined: Aug 2003
Posts: 248
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On average, I see tranny temps about 100 degrees above outside temperature in "normal", not towing, driving conditions.
I think that the gauge is slow because it is not really in the transmission fluid when you use the port on the side of the transmission. It takes a while for the sender to "pick up" the heat in the transmission.
Perhaps some of the guys who actually welded a boss on the tranny pan and put the sender in the fluid could chime in and give their experiences.
I think that the gauge is slow because it is not really in the transmission fluid when you use the port on the side of the transmission. It takes a while for the sender to "pick up" the heat in the transmission.
Perhaps some of the guys who actually welded a boss on the tranny pan and put the sender in the fluid could chime in and give their experiences.
Elder User
Joined: Aug 2004
Posts: 586
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From: Schwenksville,Pa
Mine also runs about 160*, haven't towed with it yet. I remember somone saying there is an internal thermostat in the trans that opens about 160* and also the trans cooling system is very large, no need for aftermarket cooling accessories.
New User
Joined: Apr 2004
Posts: 8
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ok anybodyknow what the temp should be under heavy towing? and with 90 degree plus outdoor temps?? Mines running 200-215... Service tech said that was OK but no hotter.. Anyone know any different??
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Senior User
Joined: Feb 2005
Posts: 423
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At 50 degrees outside temp pulling 42 ft camper the highest trans temp I saw was 190 with an autometer guage.
Probe is located in port and mine takes a long time to reach temp.
Probe is located in port and mine takes a long time to reach temp.
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Senior User
Joined: Jul 2004
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From: north louisiana
So what about the stock tranny gauge? Mine moves to the middle of the gauge, then stops. Doesn't take but a few miles at most, doesn't seem to matter what the temp is outside, or if pulling the boat or not. Don't know the temp, because it doesn't have any degrees on it, just a red area towards the top. Guess FoMoCo could've done a better job on that one, but since they left out the boost and egt gauges, no since in them getting too technical. I guess I'm lucky there aren't just a bunch of lights and NO gauges.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by beemr
Has anyone tried using the stock sensor location with a new aftermarket guage?
Torqshift uses TOT in calculations for cold shift mode, hot lock on the torque converter, line pressure calculations and shift solenoid duty cycles. Relocating it would require calculations for the impact upon reading and corresponding changes in the PCM to work properly.
Not saying it will neccessarily cause damage, but it will screw with its brain.
Edit-
With some of the shift solenoids being on inversely proportional DC and others directly proportional, variable upon line pressure...you are going to cause some shifts to get firmer, and some to get softer. While changing the computer's temp reading won't change pressure adder and multiplier tables drastically, it will create a softer shift into direct drive- a shift which is sloppy and slow with factory parameters to begin with. Not a good idea IMO, especially if you tow.
Last edited by PSD 60L Fx4; May 28, 2005 at 08:16 PM.
Elder User
Joined: Oct 2004
Posts: 587
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Can an aftermarket guage be calibrated to work with the factory sensor, or can the factory guage be calibrated to be accurate instead of acting like an idiot light?
From your dissertation, I must assume that the sensor is reading accurately to allow the computer to calculate proper imput commands to the trans, so the guage itself must not be doing much...
From your dissertation, I must assume that the sensor is reading accurately to allow the computer to calculate proper imput commands to the trans, so the guage itself must not be doing much...
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by beemr
Can an aftermarket guage be calibrated to work with the factory sensor, or can the factory guage be calibrated to be accurate instead of acting like an idiot light?
From your dissertation, I must assume that the sensor is reading accurately to allow the computer to calculate proper imput commands to the trans, so the guage itself must not be doing much...
From your dissertation, I must assume that the sensor is reading accurately to allow the computer to calculate proper imput commands to the trans, so the guage itself must not be doing much...
As far as I know, the signal is sent straight to the PCM and the PCM sends an altered signal to the gauge. If this is the case, there will be a table telling the PCM what output voltage to give to the gauge. If this is the case, the table will most likely have been modified in order to rise to "normal" at a much lower than average temperature- assuming this is how it works, the only key to making the factory gauge work properly would be to find the memory address(es) of the table and change them accordingly.
This is, assuming that my theory is correct. I cannot confirm at this time exactly how it operates- I can take a look in the morning and see if there happens to be a direct input from the factory gauge to the sending unit or not.