Please Advise Maximum Coolant, Oil and Trans Temps - Jeep Garage - Jeep Forum

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  #1  
Old 04-04-2016, 08:54 PM
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Please Advise Maximum Coolant, Oil and Trans Temps

Hi,

I have an OBDII code reader with the Torque Pro app. I've enabled the gauges for Coolant, Oil Temp and Trans Temp, and I've read a lot in the forums here and elsewhere, but I cannot find any specification of the Maximum limits for those. In other words, the numbers that are the danger numbers to watch for while the vehicle is in use. I've read lots of guesses and "I think it might be this or that", but really no specific definite limits.

Are the actual limit numbers known?

If not, please advise what limit numbers those of you who have Torque or a similar app are using for their maximum limits for each gauge.

Coolant
Oil Temp
Trans Temp

Oh, and one last question: Does anyone know if the "Roll Meter" and "Pitch Meter" gauges in Torque are operational for the JGC ecodiesel?
Thanks very much.

Bluegrass Picker

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  #2  
Old 04-05-2016, 01:15 PM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

I believe the roll and pitch indicators in Torque use the phone's accelerometer to calculate those values. If the PID starts with FF it's an internally generated PID.
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Old 04-05-2016, 03:27 PM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

The manufacturers will show a maximum "limit" for the synthetic oils in the engine and tranny plus an overheat (boiling!) limit for the coolant. e.g. Per Mobils website, Mobil1 5w30 synthetic can protect engine temps up to 500F.
The 8HP70 normal temp is around 200F and, I believe, Chrysler has 240/250F as an upper temp.

HOWEVER, there is an "Over Temp" setting for both the engine and gearbox. Your power train module would pop up a warning on the EVIC and then go into "Limp" mode.

If you are that concerned, it wouldn't hurt to send an Email to FCA asking what those particular settings are in their programming .
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Old 04-05-2016, 03:43 PM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

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Originally Posted by philbytx View Post
The manufacturers will show a maximum "limit" for the synthetic oils in the engine and tranny plus an overheat (boiling!) limit for the coolant. e.g. Per Mobils website, Mobil1 5w30 synthetic can protect engine temps up to 500F.
The 8HP70 normal temp is around 200F and, I believe, Chrysler has 240/250F as an upper temp.

HOWEVER, there is an "Over Temp" setting for both the engine and gearbox. Your power train module would pop up a warning on the EVIC and then go into "Limp" mode.

If you are that concerned, it wouldn't hurt to send an Email to FCA asking what those particular settings are in their programming .
Thanks for your reply.

I'm definitely concerned since I tow a travel trailer with the GC, and I don't want to be in the middle of nowhere in the desert going into "limp" mode or possibly doing damage if I can prevent it.

I thought that was the reason for having gauges that I could actively monitor - to prevent going into the "red zone", as opposed to just having some neat little dials to watch with no meaning other than knowing that it's somewhat warm in there....

I'll try the email route if no one here knows the numbers, but my experience with email to corporations is that I'll win the lottery before I ever get a reply....

Thanks again,
Bluegrass Picker
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Old 04-05-2016, 06:28 PM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

Bluegrass picker,

We've towed a Travel Trailer with our JGC diesel for over 15000 miles and we've driven over some serious passes during our travels, especially into Colorado and New Mexico.

Seen oil temps around 250 and tranny around 205 when its working hard in hot weather. The coolant gauge flirts in the upper reaches but just under the orange/red portion but it cools down very quickly.

I too have a Samsung tablet with an OBDII reader and the Torque Pro app but haven't had any reason to use it so far. Which is good news !

Our Lance 1685 TT usually weighs in about 4900lbs when loaded but our JGC hardly notices it really.....
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Old 04-05-2016, 07:04 PM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

Seriously doubt you will get any absolute values from FCA. I say that because it depends. That is why auto manufactures use buffered gages to keep the driver from worrying about temperature and pressure numbers.
When the BMW 335 can out (late 2006) there was virtual panic because the oil temps always ran north of 250F (when run hard) coolant not far behind and trans temps around 200F. So what. I say that because the engine will go into limp mode around 270F keeping it away from 300F which is were trouble lies.
FCA knows this and that is why the only way you will know you are going to overtemp is when the engine goes into limp mode by defueling the engine.
They have the safe guards already in place and unless you are going into limp mode you have no real idea what those numbers are.

I think we will eventually discover what those numbers are but I would really be surprised if we get them from the manufacturer. I have yet to see a manufacturer that has posted these and in fact that has been the purpose of buffered gages. For example showing C-N-H for cold, normal, hot and the normal is buffered to the low side of hot. All to keep the driver from freaking out seeing oil temps of 260F for example. The guys from OZ posted this years ago since they tow long distances and in very hot temps. I don't see them posting much about this now nor have I seen much in regard to added coolers to keep temps down.

Virtually all engine manufacturers are trying to run their engines as hot as possible for thermal efficiency so we can expect this in turbo engines and has been common place since 2007.

Sorry I don't have the numbers and I don't think anyone can do anything but venture a guess if there rig went into limp mode...
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Old 04-05-2016, 09:07 PM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

Synthetic motor oils such as Mobil one do not break down until 450 degrees. Redline oil which uses better synthetic base can go over 500 degrees. That being said, have attended corvette racing school outside of Las Vegas in summer time. Corvettes ran 300 degree plus oil temps, all day long without any problems.
Automatic transmissions generally you do not want to run over 240 degrees.
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Old 04-06-2016, 12:41 AM
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Quote:
Originally Posted by fun2drive View Post
That is why auto manufactures use buffered gages to keep the driver from worrying about temperature and pressure numbers.
The engine/trans temp on these EcoDiesels has been a perennial concern from forum users, and this is precisely why. Our gauges aren't nerfed by the manufacturer simply to keep drivers calm.

In all the "OMG! EcoDiesel temps seem to be too high!" threads over the years, I think I have read one user report of hitting limp mode/overheating. I've seen no reports of damage. People are just used to "normal" gauges on other vehicles that report misleadingly low relative values.

Put it this way: This vehicle model has been on the road for years now. If overheating while towing were an actual problem we would definitely see more forum reports of that. Instead, we get "I don't like the gauge reading" threads.
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Old 04-06-2016, 12:59 AM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

From reading the replies here, it sounds like there is then no purpose of having an app such as Torque to show the actual temperature numbers in real time, if there are no meaningful numbers to read and potentially react to? Might as well shut off Torque and just go along for the ride?
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Old 04-06-2016, 09:18 AM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

If FCA can put the trans temp & oil temp in the EVIC display, why not coolant temp & EGT temp also?


Important values to watch especially when towing. JGC comes with the towing package option. JMO. Wireman
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Old 04-06-2016, 10:43 AM
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Re: Please Advise Maximum Coolant, Oil and Trans Temps

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Originally Posted by wireman View Post
If FCA can put the trans temp & oil temp in the EVIC display, why not coolant temp & EGT temp also?


Important values to watch especially when towing. JGC comes with the towing package option. JMO. Wireman
I would think the temp values would be very important to watch when towing, and that's exactly my concern. But the values that are the most important are the maximum numbers that should not be exceeded. Without knowing those, it seems like it's just a guessing game....
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Old 04-06-2016, 02:50 PM
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Quote:
Originally Posted by Bluegrass Picker View Post
I would think the temp values would be very important to watch when towing, and that's exactly my concern. But the values that are the most important are the maximum numbers that should not be exceeded. Without knowing those, it seems like it's just a guessing game....
The EGT is probably the most important. If you're pushing 1500 you have issues
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