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Old 07-13-2015, 11:38 AM
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Jeep CRD grand Cherokee performance data

Hello members, I thought I would fill you in on some numbers of my 4000 mile towing trip. Hopefully some of you will find value in the data and answer any questions about your vehicle. First of all I had no issues the vehicle performed flawlessly, Yeah!
Fuel Mileage: In one flat and up and down hill section between Banff and Lake Louise I got 32.5MPG no towing of course. That was over about 55 miles. Some flat freeway and up and down some large hills to Moraine Lake and Lake Louise. So it can get some great mileage with no wind.
Towing: I had 2500lb trailer. Got 22mpg flat road 65mph. About 18-19 at 75mph.
When I had a head wind, bad news. Mileage dropped to 15-16mpg. Wanted to drop into 7th gear just to keep at freeway speed.

Cooling: Well this is a disappointed. My comparison is to my 99 Expedition. It could be 100deg going up a hill with AC on pulling same weight and my coolant needle never moved. It was working. I do not know how sensitive that gauge was to change. Now the Jeep. Lets describe the temperature gauge in 4ths. The first 4th when it's cold. 2nd 4th is normal running range, 3rd 4th and 4th 4th is, oh no too hot. When towing driving on flat road with no head wind it was always in the 2nd 4th, which is normal. If I had any head wind or even a small grade it went to 3/4's. But recovered quickly to 2/4's going back down a hill or back to flat or the head wind stopped. Don't know if our Jeep gauges are more accurate and sensitive. Seems like cooling system is undersized! I was towing a small load I expected not to see much extra heating.

Oil temperature: Normal flat towing or no towing seems to be about 215-220. When going up a hill towing I saw 253deg. But again cooled back down to 220 so as I was on flat road again. Head wind would cause a rise also.

Trans Temp: Really consistant. 197-203. The 203 coincided with the 253 oil temp.

I hope this was helpful to you members out there,
Mike

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Old 07-13-2015, 01:47 PM
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Re: Jeep CRD grand Cherokee performance data

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Originally Posted by mbaessler View Post
Cooling: Well this is a disappointed. My comparison is to my 99 Expedition. It could be 100deg going up a hill with AC on pulling same weight and my coolant needle never moved. It was working. I do not know how sensitive that gauge was to change. Now the Jeep. Lets describe the temperature gauge in 4ths. The first 4th when it's cold. 2nd 4th is normal running range, 3rd 4th and 4th 4th is, oh no too hot. When towing driving on flat road with no head wind it was always in the 2nd 4th, which is normal. If I had any head wind or even a small grade it went to 3/4's. But recovered quickly to 2/4's going back down a hill or back to flat or the head wind stopped. Don't know if our Jeep gauges are more accurate and sensitive. Seems like cooling system is undersized! I was towing a small load I expected not to see much extra heating.
I don't tow so I haven't paid too close attention, but the consensus is the Jeep temp gauge is linear and honest. If you're not in the red zone, you're not in trouble. Your Ford's temp went up too, but the needle was "dumbed down" so it didn't move. It's not just Ford, it's almost everyone. Those gauges are almost no better than an idiot light. And you can see why they've done that. People get nervous when the gauge moves too much.

The Ecodiesel runs warmer than many engines, that's true...the thermostat doesn't even open all the way until the coolant temps get to 225 deg F (107 C), starts to open at 207 F (97 C). But I don't know of ANYONE who has overheated towing with the Ecodiesel. Especially when it first came out, there were a lot of posts like yours though with owners thinking they were running too hot because of the "honesty" of the temp gauge.
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Old 07-15-2015, 12:55 AM
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Re: Jeep CRD grand Cherokee performance data

In good repair, the ecodiesel is very unlikely to overheat because it will pull power if it runs into predefined temps.

On a side note, I had a "dumb" needle on my VW TDI but the coolant on that thing didn't move as much as the ecodiesel.
For example, the TDI has a 192 tstat and stays there, might go up 5 degrees if your approaching triple digit speeds up a 7% grade in the summer. The ecodiesel has a 225 and goes to 245 maintaining 75mph up a grade in the summer. I think the radiator could be bigger. Granted, the GC is a 5000lb vehicle and works much harder to move around than a 3000lb car but I was surprised to see the temp swing still. Diesels have much higher thermodynamic efficiency than gassers.
One time I had a fully warmed TDI and saw the temp drop from 192 to 135 while idling in 5 degree temps for 15 minutes due to a vehicle accident.

I guess the VM Motori is just a hot motor!
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Old 07-15-2015, 02:35 AM
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Re: Jeep CRD grand Cherokee performance data

My view was always that when the GC diesel is under load, the EGR valve closes to increase combustion temps and provide more power. And when the temps hit a threshold the thermo fans kick in to prevent it overheating. So all is good.

I know some diesel owners are getting tunes done with the option to disable the EGR, I'm hoping for some feedback on temps.
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Old 07-15-2015, 07:29 AM
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Re: Jeep CRD grand Cherokee performance data

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Originally Posted by Benn0 View Post
My view was always that when the GC diesel is under load, the EGR valve closes to increase combustion temps and provide more power. And when the temps hit a threshold the thermo fans kick in to prevent it overheating. So all is good.

I know some diesel owners are getting tunes done with the option to disable the EGR, I'm hoping for some feedback on temps.

Mine was tuned with GDE from new. 245 degree coolant going up grade with no extra load in summer.
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