Ecodiesel power derating as temps rise?

[steelponycowboy]

Have any of you experienced derate after getting the DEF recall flash?

No change after the DEF recall flash. Still suffered high oil temps and derating on the way from Phoenix to Flagstaff and back for the Overland Expo two weeks ago. I could not get it to go above 45 mph going up the hill out of Camp Verde and my oil temps again were as high as 268, just 4 degrees before it shuts down and goes into limp mode. I do seem to be getting more DEF per mile than I used to but MPG is still dismal around 16 average and I've not towed with it.

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[terpsmandan]

Only thing I can comment on is that I have a Tazer with the boost gauge showing and I have seen lower boost as the temp gets warmer.

 

[steelponycowboy]

Only thing I can comment on is that I have a Tazer with the boost gauge showing and I have seen lower boost as the temp gets warmer.

So you too are experiencing de-rating too

 

[terpsmandan]

So you too are experiencing de-rating too

Yeah. Got the tazer and saw boost levels up to 30 psi max. Sent the computer out for a GDE tune and the max boost was just under 36 in March when I first installed it. Now we have these warmer temps and max boost seems to be just over 30 psi.

 

[steelponycowboy]

Yeah. Got the tazer and saw boost levels up to 30 psi max. Sent the computer out for a GDE tune and the max boost was just under 36 in March when I first installed it. Now we have these warmer temps and max boost seems to be just over 30 psi.

My reluctance to anything GDE is that it will void my warranty on the engine. Not willing to jeopardize that.

 

[terpsmandan]

Yolo….

 

[Jefe1018]

Well finally got to tow in the heat yesterday. I went from Vegas to Lake Mojave, roughly 75 miles each way. The temp gauage in the truck varied from 93-97 degrees.

There were two notoriously long climbs, one leaving Vegas and the other entering Searchlight.

I’d seen temps in the 240’s and low 250’s at 80mph towing the same boat to Texas and back (3,500-3,800lbs) but that was in December.

On this trip I saw temps hit high 250’s and 262 a few times. Each of those I slowed down and let the engine temps drop.

I certainly was concerned, but the engine didn’t derate. I’m used to driving up hill with cruise on and no issues in an old 12 valve Cummins my family owned. However, I did slow down from the 75mph speed limit to 60-65mph and watched the temps closely.

I was super happy with my diesel up until yesterday and quite frankly still am. However, I’m really looking and hoping for the aftermarket to come up with a solution to this problem. I’ve been reading through this thread and found a few possible solutions but nothing long term. I understand we are restricted on airflow, however, whether it’s a hood, a grill, an auxiliary cooler or a combination of all of them, I’m up for it.

 

[@californiajeeping]

I have a banks derringer with the idash and have seen 370 manifold air temprature at 30psi uphill. I wonder if a larger intercooler would help out temps? I’ve seen 260 oil temp without derate on a 99 degree day on some speed test runs to the speed limiter. These things run way too hot.

 

[PackMule]

I'm updating the thread for a link to file a compliant with the NHTSA. If we ever want this issue/repair to gain traction with FCA, we need to get an investigation started. Only takes a few mins.

Be sure to include a detailed summary of your experiences. I think it's key to include IF your vehicle overheats/derates making it impossible to merge safely at the posted speed limit since this is the safety part of the problem. The towing is a secondary issue and that issue may never be fixed if it indeed meets/exceeds the J2807 test.


https://www.nhtsa.gov/report-a-safety-problem#index

Thanks for the link.

...Filed my complaint.

 

[Jefe1018]

I have a banks derringer with the idash and have seen 370 manifold air temprature at 30psi uphill. I wonder if a larger intercooler would help out temps? I’ve seen 260 oil temp without derate on a 99 degree day on some speed test runs to the speed limiter. These things run way too hot.

I just noted that AFE came out with a charge pipe kit and claim some gains - I'd assume they help the intercooler be more efficient and keeping operating temps lower - they also claim this.

https://afepower.com/afe-power-46-2...m-hot-and-cold-charge-pipe-kit-black#overview

Anyone have any experience with it? At $554, not cheap.

 

[@californiajeeping]

I just noted that AFE came out with a charge pipe kit and claim some gains - I'd assume they help the intercooler be more efficient and keeping operating temps lower - they also claim this.

https://afepower.com/afe-power-46-2...m-hot-and-cold-charge-pipe-kit-black#overview

Anyone have any experience with it? At $554, not cheap.

One gentleman on FB has this and zero difference in anything.

 

[Jefe1018]

One gentleman on FB has this and zero difference in anything.

I figured as much, kind of like a CAI maybe? I reached out to them directly and if they come back with anything credible and if they do, what that is.

 

[kayakr2769]

Happened to me thrice yesterday on a trip to Phoenix and back. Ascending the grade out of Camp Verde, at 65 mph unloaded, it first shut cruise control down, then went into self-preservation mode. Ambient air temp was 102f. On the return trip, it depowered climbing the black canyon grade, then finally the Bell Rock grade (coolant @ 222, oil @ 244, IAT @ 245!!!!!!!!). We're working on a heat mitigation solution now. The Jeep is a special order 21 JTRD with 221 miles. There was a MIL for fuel flow higher than expected, which was wiped.

I expected you would be OK since ambient temps are so cool right now.

The wife and I just bought our New 2021 diesel gladiator a few months ago .. our intended use was to pull our 3500 lb A-frame pop-up trailer .. we live in n/w phx. .. I have been following and read every post here so far .. I have a question .. I think the specs say the diesels' most torque is at 1400 rpm's .. in theory .. If I watch my rpms and manually shift when pulling the I-17 hills do you think this might keep the jeep from building up excessive heat and derating .. thoughts Please... thanks Glenn

 

[CrazyCooter]

The wife and I just bought our New 2021 diesel gladiator a few months ago .. our intended use was to pull our 3500 lb A-frame pop-up trailer .. we live in n/w phx. .. I have been following and read every post here so far .. I have a question .. I think the specs say the diesels' most torque is at 1400 rpm's .. in theory .. If I watch my rpms and manually shift when pulling the I-17 hills do you think this might keep the jeep from building up excessive heat and derating .. thoughts Please... thanks Glenn

Like I've mentioned in this thread before.........It takes "X" hp to do "X" work. Hp is just a calculated factor of torque. That said, more fuel equals more heat. Your speed up the hill will determine how much heat has to be shed from the cooling system and ambient conditions will dictate how much heat can be shed.

Your 3500lb tent trailer has a much lower profile than my 3500lb GeoPro, so I would think you have the advantage? If you start the bottom of the hill with 10° cooler oil temp from lighter wind loads, it will take longer to reach the derate point.

At 110°. expect to me on the side of the road. At 80° you will probably be OK.

 

[Rat2Desert]

The wife and I just bought our New 2021 diesel gladiator a few months ago .. our intended use was to pull our 3500 lb A-frame pop-up trailer .. we live in n/w phx. .. I have been following and read every post here so far .. I have a question .. I think the specs say the diesels' most torque is at 1400 rpm's .. in theory .. If I watch my rpms and manually shift when pulling the I-17 hills do you think this might keep the jeep from building up excessive heat and derating .. thoughts Please... thanks Glenn

I'm very familiar with that grade, Dad lives in Scottsdale, brother in Prescott. I towed up 17 with my 20' Silver Streak trailer, about 3,500 lbs. Gladiator (Rubi) was at gross, I was on a 3 week camping trip. During that trip I towed through S. Cali and Az at 118 all the way up to mountain grades in Wyoming, close to 9,000 feet was the highest pass. My strategy was to watch EGT temps and keep them below 1200, which mostly kept my oil and water temps low enough. On really long grades at altitude I noticed the oil and water temps would creep up and I'd have to use those as my limiting factor, not EGTs

What that meant was at times I was down to 45 mph on a really long, hot, high grade. And some of those grades are really steep, especially in Wyoming. But on most grades at most altitudes and temps I was able to drive at 75-80 with AC on and not have any temp issues. I shifted manually almost all the time, 3500 mile trip, average mileage was 16.8, towing about 80% of the time.

Generally, when I was reducing speed due to heat I felt like I was close to pushing the engine as hard as I wanted. Overall I'm really pleased with this truck, towing for me is just fine. I'm coming from a V8 Grand Cherokee, which I used to tow the same trailer many 1000s of miles in mountains as well. Much more pleasant experience with the diesel. The gasser would wind up the hills at high rpm, felt like it was ready to explode. I often had to run the heater to keep temps down. And mileage . . . 8-10 mpg with the V8.

As has been mentioned before, grade, altitude and temp make a big difference in towing speed. Below 3-4000 ft, less that 90 degrees and under say a 3% grade there doesn't seem to be a limit. I maintained 65+ up the grade outside of Indio in 115 with the AC on, no temp issues. Also, seems like 5-6000 feet is critical altitude for the turbo, I notice a drop in power around there.

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