Off road Speed limit - JeepForum.com
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post #1 of 15 Old 09-25-2021, 05:21 PM Thread Starter
WiKi2
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Off road Speed limit

Whats the purpose of the Speed limit while on OR 1 or 2? and can it be overridden?

Last week while driving with my friends I was being left behind because I cannot surpass 40mph while OR and it was pretty annoying. I know I could obviously just drive on the regular mode but it be nice if I could ride at a higher height without the speed limit.

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post #2 of 15 Old 09-25-2021, 05:36 PM
ColdCase
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Its a safety thing, along with CV joint abuse. I believe you can change the limits with a scanner and programming, like AlfaOBD, AppCar, JScan... etc. But be careful about warranties and modified software,
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post #3 of 15 Old 09-25-2021, 05:37 PM
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I know people are looking in the AlfaOBD app to disable or modify the settings, but I haven't been able to find it yet either.

Very Respectfully

Ed
Going fast is only half the fun... You get to build it first.
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post #4 of 15 Old 09-25-2021, 05:39 PM Thread Starter
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Quote:
Originally Posted by ColdCase View Post
Its a safety thing, along with CV joint abuse. I believe you can change the limits with a scanner and programming, like AlfaOBD, AppCar, JScan... etc. But be careful about warranties and modified software,
Interesting, does Jeep offer any reading material as to how speed relates to excess CV joint abuse or anything to justify the programmed speed limit?
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post #5 of 15 Old 09-25-2021, 05:43 PM
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BTW, many here add normal mode ground clearance by installing larger diameter tires and adjusting the QL links a little bit. No need to disable the speed limits on trails you can run 50mph on.

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #6 of 15 Old 09-25-2021, 05:52 PM
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Quote:
Originally Posted by WiKi2 View Post
Interesting, does Jeep offer any reading material as to how speed relates to excess CV joint abuse or anything to justify the programmed speed limit?
The faster you turn CV joints with sharper angles, the more wear and tear, is common knowledge.

I think you will find specifics and the details related to safety and stability compromises either categorized as trade secrets or, given the litigious society, proprietary.

I don't think I've seen anything published specific to Jeep.

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #7 of 15 Old 09-25-2021, 05:57 PM Thread Starter
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Originally Posted by ColdCase View Post
BTW, many here add normal mode ground clearance by installing larger diameter tires and adjusting the QL links a little bit. No need to disable the speed limits on trails you can run 50mph on.
How do you adjust the QL links? any threads you can recommend?
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post #8 of 15 Old 09-25-2021, 06:11 PM
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Dunno of any off hand, its been discussed here often. You may be able to play with the height calibration with a scanner. Most replace the fixed links on the four height sensors with adjustable links made from hardware store items or from a couple aftermarket sources popular with those that want to lower suspensions. Advice is limit adjustment to no more than inch.

The WK2 raises ride hight by effectively stiffening the springs, so your ride will be affected.
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I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #9 of 15 Old 09-25-2021, 06:30 PM
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Originally Posted by WiKi2 View Post
How do you adjust the QL links? any threads you can recommend?
The links themselves cannot be adjusted, but they can easily be replace with lifting or lowering links.

You can pick up a set at AirLinks Suspension

Very Respectfully

Ed
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Last edited by IDoMy0wnRacing; 09-25-2021 at 06:31 PM. Reason: corrected a typo
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post #10 of 15 Old 09-25-2021, 07:28 PM Thread Starter
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Originally Posted by IDoMy0wnRacing View Post
The links themselves cannot be adjusted, but they can easily be replace with lifting or lowering links.

You can pick up a set at AirLinks Suspension
Any idea if adding these would void warranty? as well, it says OR2 will not work when adding the Lift links, is it because with the links added, its already at its maximum height?
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post #11 of 15 Old 09-25-2021, 10:09 PM
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If you desire some durability, do not add more than inch to ride height with modified links. When you add more and use ORAII heights, QL will try to push your control arms through the rebound stops. Hard on compressors, will not articulate at all, and you will need to start replacing fillings.... among other things.

The ride sensors do not sense ground clearance, only how much the suspension is extended. Modified links trick the sensors into sending less than actual extension to the QL control module which in turn will extend the suspension to compensate.
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I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #12 of 15 Old 09-25-2021, 11:19 PM Thread Starter
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Originally Posted by ColdCase View Post
If you desire some durability, do not add more than inch to ride height with modified links. When you add more and use ORAII heights, QL will try to push your control arms through the rebound stops. Hard on compressors, will not articulate at all, and you will need to start replacing fillings.... among other things.

The ride sensors do not sense ground clearance, only how much the suspension is extended. Modified links trick the sensors into sending less than actual extension to the QL control module which in turn will ectend the suspension to compensate.
Cold case, thank you very much. Im impressed by your knowledge on this vehicle, you should consider working for Jeep haha. Thanks again.
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post #13 of 15 Old 09-26-2021, 07:52 PM
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Originally Posted by WiKi2 View Post
Any idea if adding these would void warranty? as well, it says OR2 will not work when adding the Lift links, is it because with the links added, its already at its maximum height?
Voiding the warranty, I am sure it would give them a reason not to honor it.

The Lift Links will, as @ColdCase said, trick the sensors in to thinking it is at normal ride height (NRH) when it is actually riding in OR1. When you select OR1 the Jeep will raise to OR2, but think it is in OR1. That is why OR2 will not work with the Lift Links.

These work great for ripping down a dirt road at a high rate of speed, with the added clearance of OR1, but very hard on the suspension and CV joints.

Very Respectfully

Ed
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post #14 of 15 Old 09-26-2021, 08:42 PM Thread Starter
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After seeing a few videos it seems very simple so if I ever wanted to maybe while going off road I can swap them in an out, but I doubt I will be doing that or the mod overall. I think I would prefer to go through the software, in regards to that voiding warranty I would think them finding out the speed limit on OR being adjusted is almost impossible to detect unless they were to go driving and choose OR for some reason. Unless when they plug in their scanners it tells them changes have been made..?
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post #15 of 15 Old 09-26-2021, 10:30 PM
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Any mods to the the modules leave a foot print (last modified data, including date and authorization code) that is stored in non volatile and protected memory. They can specifically determine what changed by downloading the revised firmware/parameters and compare to released version, if they care.
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I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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