RPM near 6k after last central cluster recall and upc upgrade

[CapChimiChangas]

Hi,

I did the cluster central recall, and they also updated my upc (central compute unit) ( I may have used the wrong acronym), so I was traveling to the mountains for some break, the same trip I did before all fixes and upgrades. I’m still I stock gear ratio no changes from before ( just using Amsoil 0w-20 now instead of dealer), automatic transmission, and on a climbing it went to 6k rpm. And it has been like that for everything on my regular commute. It goes to 4K ~ 5k rpm sometimes. So ,is anyone else experiencing the same thing?

I switch to manual most of the time to avoid frying the engine.

All help is welcome. I already have a set appointment with the dealer on Tuesday to take it in for checking this.


Update:

After the Jeep had stayed with them for a week and they had used half tank, the conclusion was that:
It was alright;

There was nothing wrong - their words.

Also, since they never reached more than 60mph, it won't catch it and the acceleration from 0 to N on a light "normal" operation for them.

So I better regear this ASAP, and yes something is going on with the latest firmware update

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[Stan H]

How steep are these grades. Usually by 4k it will shift. How heavy are you loaded? Are you pulling a camper? Did you try letting off the skinny pedal and seeing if it would shift into next gear ?

 

[CapChimiChangas]

How steep are these grades. Usually by 4k it will shift. How heavy are you loaded? Are you pulling a camper? Did you try letting off the skinny pedal and seeing if it would shift into next gear ?

Thanks

Steep as 30 degrees or less, the path could have some 40degrees spots just 3 people , luggage and snowboard, that is it the load, no towing.

 

[Stan H]

Thanks

Steep as 30 degrees or less, the path could have some 40degrees spots just 3 people , luggage and snowboard, that is it the load, no towing.

The 850RE is designed on a hill to continue to deliver maximum torque and not sgift up just like it drops a gear or 2 as you climb to maximize power. The GPS and other sensors help to control this function it will stay in a gear on a steep incline. Now I have pulled 20% grade with mine and it will not shift up for that very reason and that is in the 60degree territory so steep the front wheels barely stay down when the material is loose. I was in the low side while doing this. High side will be even more restrictive about not shifting up.

You are concerned about frying your motor . My suggestion to you is just back off the skinny peddle let it pull and shift down and modulate the gas peddle easing off it so you stay 3k-4k and that is the powering torque of the V6 3.6L 220c.i.d. that is in these gladiators . If you was to regear your axles to 4.88 or something close you may find it would shift up more. But then you would have to have a tazer or flashcal to program the new gear size in the computer. If you are running bigger tires I trust you have already done this or else the computer will think it is towing all the time and not let it upshift.

 

[Flanders]

I wonder if anyone else has seen something like this. I've been holding off on the recall out of fear it will introduce additional problems.

Steep as 30 degrees or less, the path could have some 40degrees spots just 3 people , luggage and snowboard, that is it the load, no towing.

30 degrees? There are no highways that steep in the US. Nothing even close. There are some short sections of streets with grades exceeding 30% (16.7 degrees), but I think there's only one highway steeper than about 20% grade (11.3 degrees) and it's closed for the winter.

Pulling a 5000 lb weight up a 30 degree slope at just 30 mph would require 200 horsepower. That's in addition to whatever power it takes to move the thing at that speed on level ground, plus drivetrain losses as it revs to 6000 RPM which it would have to in order to produce that kind of power.

 

[CapChimiChangas]

I wonder if anyone else has seen something like this. I've been holding off on the recall out of fear it will introduce additional problems.



30 degrees? There are no highways that steep in the US. Nothing even close. There are some short sections of streets with grades exceeding 30% (16.7 degrees), but I think there's only one highway steeper than about 20% grade (11.3 degrees) and it's closed for the winter.

Pulling a 5000 lb weight up a 30-degree slope at just 30 mph would require 200 horsepower. That's in addition to whatever power it takes to move the thing at that speed on level ground, plus drivetrain losses as it revs to 6000 RPM which it would have to in order to produce that kind of power.

Quick fact: you will find the 10 Steepest Roads in the US [Update 2024]

The road I was on was in California, and you're right, it was not 30 but 27. It is the steepest spot on the road (I googled it, too) I traveled.

I'm taking it to the dealer tomorrow to see what they say. The issue since the upgrade of the center cluster (due to recall) is that my gladiator is pumping that acceleration above 3k (almost always on 4k) to start driving after the lights go green and I start accelerating. Due to that, I hear a gurgling from the engine. I checked, and it seems the rock arms, lifters, and camshaft have given due to that constant high rpm, and that jump to 6k made the engine pump really hard, at that moment, the nose began, and now every time I reached 70mph, I hear it.

 

[CapChimiChangas]

The 850RE is designed on a hill to continue to deliver maximum torque and not sgift up just like it drops a gear or 2 as you climb to maximize power. The GPS and other sensors help to control this function it will stay in a gear on a steep incline. Now I have pulled 20% grade with mine and it will not shift up for that very reason and that is in the 60degree territory so steep the front wheels barely stay down when the material is loose. I was in the low side while doing this. High side will be even more restrictive about not shifting up.

You are concerned about frying your motor . My suggestion to you is just back off the skinny peddle let it pull and shift down and modulate the gas peddle easing off it so you stay 3k-4k and that is the powering torque of the V6 3.6L 220c.i.d. that is in these gladiators . If you was to regear your axles to 4.88 or something close you may find it would shift up more. But then you would have to have a tazer or flashcal to program the new gear size in the computer. If you are running bigger tires I trust you have already done this or else the computer will think it is towing all the time and not let it upshift.

I plan to regear, but currently, I am running all stock. I need to find the correct Revolution for M220 and M210 Axles (the New Dana 44 that comes on Gladiator Sport S) and find the time. Also, I need to buy a backlash dial measurement; I just bought a pinion depth tool. So I need the tool, and then it is time to have a DYI garage that rents me the shop so I can work there. So, regear is on plans for this year before any wheel and tire changes, and to get the 8th and 7th on flats (even at 33)

 

[Flanders]

Quick fact: you will find the 10 Steepest Roads in the US [Update 2024]

Only one of them has sections over 20 degrees, and It's only open to residents of the big island of Hawaii. The others only have short sections (200 meters at most) over 10 degrees.

The road I was on was in California, and you're right, it was not 30 but 27. It is the steepest spot on the road (I googled it, too) I traveled.

You're still confusing gradient and degrees, or at least ignoring it. The road you were on might have been a maximum of 15 degrees for a few dozen meters at most. I don't care about a few dozen meters.

Steep as 30 degrees or less, the path could have some 40degrees spots

You've greatly overestimated steepness. Is there even one kilometer of more than 10 degree average slope on any US highway?

 

[Stan H]

Only one of them has sections over 20 degrees, and It's only open to residents of the big island of Hawaii. The others only have short sections (200 meters at most) over 10 degrees.



You're still confusing gradient and degrees, or at least ignoring it. The road you were on might have been a maximum of 15 degrees for a few dozen meters at most. I don't care about a few dozen meters.



You've greatly overestimated steepness. Is there even one kilometer of more than 10 degree average slope on any US highway?

No I been on about all of em. Only dirt roads. Or park roads to special sites. Only one I can think is route I- 68 in Maryland going down into and coming out of Cumberland MD or the 2 land coming out of Luke MD toward swanton,MD. Or RT. 50 on the Allegheny switch backs . WV and MD both have roads of that degree. One I can think is either state Access RD to Jennings Randolph Lake. Over 11°degrees .
No I have personally had my Jeep Many times on pipeline right of ways both dirt and rock that registered 19 & 20 ° degree which if I do my math correctly translates to 37 to 38 percent grade .

 

[Flanders]

No I been on about all of em. Only dirt roads. Or park roads to special sites. Only one I can think is route I- 68 in Maryland going down into and coming out of Cumberland MD or the 2 land coming out of Luke MD toward swanton,MD. Or RT. 50 on the Allegheny switch backs . WV and MD both have roads of that degree. One I can think is either state Access RD to Jennings Randolph Lake. Over 11°degrees .
No I have personally had my Jeep Many times on pipeline right of ways both dirt and rock that registered 19 & 20 ° degree which if I do my math correctly translates to 37 to 38 percent grade .

Close enough. Grade is just algebraic slope, ∆y/∆x, and grade from degrees is just the trigonometric tangent. If I did it right, tan(20°) = 36.4% grade.

I only just learned an interesting interpretation of grade: The grade at which an object begins to slide downhill is equal to the coefficient of friction between it and the surface.

Road tires on dry asphalt have a coefficient of friction around 0.9, according to google. So the steepest highway grade you could even hope to climb in a 4WD is 90%, around 42°.

For a 2WD it scales by the proportion of vehicle weight on the drive tires, maybe 60% for a FWD, for a 54% max grade, around 28°.

Friction is cut in half, roughy, on wet pavement, and the steepest wet grade the FWD could hope to climb is about 27% or 15°.

Sonora Pass, CA 108 northwest of Yosemite, is usually named as the steepest highway in the US, with a claimed maximum grade of 26%. That number is just for bragging rights - the 26% grade is very short. It does have two 500 meter sections of 15% average grade, 8.5°, probably about as steep as it gets on US highways for any distance.

Old Priest Grade, west of Yosemite, climbs 430 meters over a 3km drive, a sustained 14% grade = 8° climb. I had a transmission seal fail going up that about 15 years ago. Drained and destroyed the transmission before I knew anything was wrong. That was common with Fords in that spot, according to the guys at the repair shop at the top in Big Oak Flat.

 

[CapChimiChangas]

Only one of them has sections over 20 degrees, and It's only open to residents of the big island of Hawaii. The others only have short sections (200 meters at most) over 10 degrees.



You're still confusing gradient and degrees, or at least ignoring it. The road you were on might have been a maximum of 15 degrees for a few dozen meters at most. I don't care about a few dozen meters.



You've greatly overestimated steepness. Is there even one kilometer of more than 10 degree average slope on any US highway?

Hi. Sorry for the delay; I had to get the jeep back and other stuff.

To be clear, by angle, I meant angle, so from 0 to X, literally. I wasn't thinking of gradient when I said "steep as. " I meant by the angle., anything >= 30 degrees with a >=3 Ton mass would meant a steep angle.

Now, thanks to the overall feedback on steepness and gradient, I'll read more on it.

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