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Old 08-22-2014, 06:14 PM
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First Tow with Diesel

I traded in my 2011 Summit Hemi for a 2014 Summit Diesel at the beginning of the month and drove it a good amount to break it in. Got the car to 1k miles before towing. In those 1k miles I loved the feeling of the motor and after 2k miles today am still loving it.

I towed approximately 5,500lbs from Southern California to Las Vegas and back this week. Summertime through the 15 ranges from 80's to 100's depending where you're at on the hike. As most of your experiences have shown, mine are the same. When towing on a grade the water temp sits just below red and stays there. There were a few instances when the grade got a bit steeper that the needle crept into red territory and I backed off and drove 45mph for a while until the needle came down. Temp swings are pretty drastic with this motor, as soon as I let off or crest a hill, the temp will drop 10 degrees or so, when I get on it while on a grade the temp will raise up by the same amount.

Other than sweaty palms staring at the water temp, the Jeep performed like a champ. I felt more confident towing this load compared to my 5.7 that I traded in last month.

Lastly, the fuel economy pulling through this pass was great! Typically with the Hemi I was averaging 9MPG, this run up and down including a few miles within Vegas without a load got me 15.3MPG on taller tires, accounting for the 5% difference in rolling circumference means 16MPG towing a heavy trailer with a giant face. Unfortunately, the place I rent from only has an 8ft tall enclosed trailer in the length that I need. I am basically pulling a 5500lb sail behind me.

other notes: I'm using an Andersen WD hitch. it makes a world of difference using it versus a standard hitch. Although I have no experience using the bar method of WD, these chains are a cinch to use and install onto a rental trailer and remove without much marring of the trailer. Sway was negligible and the jeep felt rock solid through the entire route.
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Old 08-22-2014, 10:13 PM
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Re: First Tow with Diesel

Wow look at those temps. Do you remember what altitude you were at also? I wonder if a larger radiator is in order for summer tows.


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Old 08-23-2014, 12:50 PM
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Re: First Tow with Diesel

Hi,
Good info on towing. I have the new diesel GC also. How/where did you get the EGT and DPF gauges? They look great, and fit under the instrument panel. Cost? Thanks
Jim
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Old 08-23-2014, 03:47 PM
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Re: First Tow with Diesel

What did you see for peak coolant temps? I don't see any numbers on your coolant gauge...
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Old 08-23-2014, 06:34 PM
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Re: First Tow with Diesel

It's the scan gauge 2, works great and gives a lot of data.

Max water temp I saw was 235
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Old 08-23-2014, 08:02 PM
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Re: First Tow with Diesel

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Originally Posted by frydryce View Post
It's the scan gauge 2, works great and gives a lot of data.

Max water temp I saw was 235
I see why you were sweating it. Those temps are well outside of my comfort zone, synthetic oil not withstanding.

Looks like a good opportunity for a 200*F aftermarket thermostat or even a higher flow water pump.
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Old 08-25-2014, 01:06 AM
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Re: First Tow with Diesel

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Originally Posted by frydryce View Post
It's the scan gauge 2, works great and gives a lot of data. Max water temp I saw was 235
To further explain, the GC only has an analog water temp Guage but the ScanGuage2 has a digital readout (as you know). The SG2 must be programmed to display EGT, DPF, and CAT temps. For the benefit of others, I posted the info in another thread.

http://www.jeepgarage.org/f222/scanguage2-xguage-codes-for-egt-76564-post1045136.html
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Old 08-25-2014, 03:46 PM
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Re: First Tow with Diesel

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Originally Posted by Ranger1 View Post
I see why you were sweating it. Those temps are well outside of my comfort zone, synthetic oil not withstanding.

Looks like a good opportunity for a 200*F aftermarket thermostat or even a higher flow water pump.
The CRD thermostat doesn't fully open until the coolant temp reaches 225 F according to the CRD mx manual.
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Old 08-25-2014, 04:23 PM
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Re: First Tow with Diesel

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Originally Posted by talltale View Post
The CRD thermostat doesn't fully open until the coolant temp reaches 225 F according to the CRD mx manual.
yeah I could see that. The jeep would quickly get to the edge of hot, then just sit there. I only briefly crossed the line on a steep portion after a long span of time after which I backed off and it quickly came back down to the edge. seems like we're all used to seeing the needle camp in the middle of the gauge. the diesel gauge likes to dance like patrick swayze

again, I wish we could just chat with the engineers about this to see what the real tolerances were so we're not shitting our pants when towing a load well within the limits of the manual (which is pretty conservative probably for legal purposes)
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Old 08-26-2014, 06:25 AM
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Re: First Tow with Diesel

Not surprised the t-stat opens at 225. It ain't a gasser! Diesels are most efficient when warm and therefor do tend to run hotter. My cummins will jump from 190 to 220 with a load.

However, hitting red leads me to think this thing needs a bigger radiator or better cooling ducts. An SRT vented hood perhaps

What's the frontal area of that trailer?


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Old 08-26-2014, 08:34 PM
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Re: First Tow with Diesel

yeah it's odd, tstat opens at 225 and red is at 230. Spoke with the service manager today, he said he's been made aware and unless you get a CEL, then the car is well within it's tolerances and keep driving.
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Old 08-26-2014, 08:50 PM
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Re: First Tow with Diesel

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Originally Posted by frydryce View Post
yeah it's odd, tstat opens at 225 and red is at 230. Spoke with the service manager today, he said he's been made aware and unless you get a CEL, then the car is well within it's tolerances and keep driving.
Sounds like a 205 or 210 T-stat would help keep things in check and allow more thermal headroom. It wouldn't allow continuously towing more or harder but would help with short grades.
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