Diesel would not pull me up a curb. - Jeep Garage - Jeep Forum

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  #1  
Old 03-01-2016, 10:14 PM
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Diesel would not pull me up a curb.

The weirdest thing happened...
I dropped over the edge of a curb 6-7" down. Actually it was a driveway that dead ends into the yard and has a 6" drop to the dirt. I stopped a foot after going into the yard and put it in reverse to back up the edge of the drive. Crept up to the edge and kept applying power.
The vehicle just bogged down. I turned off the traction control and still the engine just chuffed and bogged down. I put in N and switched on the 4x4L and the truck pulled out like it was nothing. WTF is going on?

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Old 03-02-2016, 07:11 AM
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Re: Diesel would not pull me up a curb.

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Originally Posted by midsouthduckhunter View Post
The weirdest thing happened...
I dropped over the edge of a curb 6-7" down. Actually it was a driveway that dead ends into the yard and has a 6" drop to the dirt. I stopped a foot after going into the yard and put it in reverse to back up the edge of the drive. Crept up to the edge and kept applying power.
The vehicle just bogged down. I turned off the traction control and still the engine just chuffed and bogged down. I put in N and switched on the 4x4L and the truck pulled out like it was nothing. WTF is going on?
You either ran out of torques...or pressing the ESC button really only turned the electronics "Partially Off" (as actually described in the manual) and that was not enough to get you moving...or your TCS/ESC/BLD/ABS module(s) have a faulty condition.
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Old 03-02-2016, 04:21 PM
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Re: Diesel would not pull me up a curb.

That is odd...how would that be any different than starting out up hill with a loaded trailer on the back?
That certainly shouldn't be a problem for any jeep,let alone an Ecodiesel.....


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Old 03-02-2016, 08:03 PM
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Re: Diesel would not pull me up a curb.

This is a common issue that my Jeep will go anywhere. Nope. Your power is driving forward not upward. The torque has to translate from horizontal to vertical and ran out of torque as noted before. Using low which is for situations like this provides a great deal of added torque multiplication.
If you had some momentum you would have had success.
This puts a great deal of stress on the entire drivetrain by the way and will cause a rapid rise in transmission temperature as the torque converter works hard to overcome this stopped condition.
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Old 03-03-2016, 11:21 PM
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Re: Diesel would not pull me up a curb.

Quote:
Originally Posted by fun2drive View Post
This is a common issue that my Jeep will go anywhere. Nope. Your power is driving forward not upward. The torque has to translate from horizontal to vertical and ran out of torque as noted before. Using low which is for situations like this provides a great deal of added torque multiplication.
If you had some momentum you would have had success.
This puts a great deal of stress on the entire drivetrain by the way and will cause a rapid rise in transmission temperature as the torque converter works hard to overcome this stopped condition.
Ok I agree the power is reduced going up a hill fwd or rev; the equation is Pb = Pt * cos(b), where B is the angle. If I let B = 30 deg, then available power will be P*.866 or 87% of maximum, not counting other factors.
The 8sp ZF tranny gear ratios are (I think):
1st 4.714
2nd 3.143
3rd 2.106
4th 1.667
5th 1.285
6th 1.000
7th 0.839
8th 0.667
Reverse 3.295

Low range is 2.72
Axle ratio is 3.45

In reverse the final drive ratio is 3.295 x 3.45 = 11.37
In reverse with 4x4L it is 3.295 x 3.45 x 2.72 = 30.0

Hell, it seems like I can try to go up the hill in 2nd gear and still bog down! I'll try that tomorrow. Sheesh
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Old 03-04-2016, 09:40 AM
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Re: Diesel would not pull me up a curb.

You'll also have torque multiplication from the slip of the torque converter in the auto transmission.
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Old 03-04-2016, 06:18 PM
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Re: Diesel would not pull me up a curb.

Quote:
Originally Posted by midsouthduckhunter View Post
I turned off the traction control and still the engine just chuffed and bogged down.
fun2drive has it for the 3-pointer.

Quote:
Originally Posted by fun2drive
The torque has to translate from horizontal to vertical
You would have had to pull the front end up vertically over the curb before moving an inch backwards (up an incline). Even a Jeep can't fight physics...not without big tires and a low-range
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