XR observations

[Plumbean]

Your build sheet will tell you which springs. My JLUHT with XR has 5900# springs. A friend’s JLURXR with steel bumpers has 6100# springs.
Another observation, at 37 psi cold in the tires, after 4,000 miles I was thinking I needed a new lift. Stiff sidewalks meant rapid initial compression and seemed to overload compression damping of the front shocks. Light steering and poor feel. I dropped to 30psi cold to allow the 35s to work properly and it is like a different Jeep. Steers better, better traction, better ride and the 35s are now doing their part in initial compression. Why have the big sidewalls of the 35s and not use them? I don’t notice the bump stops now. Simple change. Big impact on the stock XR suspension. Easier on the suspension and definitely on the shocks, easier on your tires. Try it for a week. I still see 24 mpg at 60 mph over 100 miles loop with eTorque V-6, 850re trans and 4.56 gears. That is great. Push to 75 and watch that drop by 25%(!)(aerodynamics of a brick). I have not been able to measure a difference with 30psi versus 37 psi in mpg at 60 mph.

Where do your numbers come from? I know what springs I have (0191AB) but don't know how those line up with the figures you have above. Does the 6100# figure line up with the 0191AB springs? In any event, that post you are quoting is from back in September but I am still not sure we have determined consistency regarding which springs were shipped with which configuration of the XR.

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[Apexcars]

Another observation, at 37 psi cold in the tires, after 4,000 miles I was thinking I needed a new lift. Stiff sidewalks meant rapid initial compression and seemed to overload compression damping of the front shocks.

Might help if you started driving on the roads more and the sidewalks less.

 

[Capt. Don]

Might help if you started driving on the roads more and the sidewalks less.

HaHa! OK, edited to "sidewalls." I still think that stiff sidewalls at 37 psi make a JLUXR pretty miserable to drive. There is a better handling, better riding, better traction Jeep Xtreme Recon hiding in there and you can find it at 30 psi. Amazing how much better the 1.5 inch lift and the XR specific shocks work with 30 psi in the 35s and allowing those big sidewalls to do their normal job, easing the initial impact absorbtion/harshness on shocks and springs, and the tires. I do not like to recommend something other than actual Jeep specifications, I really don't, but this is a big deal on a 2022 JLUXRHT. I am actually happy now with my XR suspension, lift, wheels and tires. I'm really dumb and hard-headed, I stuck with the Jeep specifications for inflation pressure for four months. Until my Colorado Jeep buddies shamed me (and so enjoyed doing it, "Don, are you dumb?") into remembering how 35s work on the road and off, and what inflation pressures each require. Even the Colorado ZR2 Bison with their electro-magnetic continuously adjustable shocks that improve this initial shock absorbtion and then adjust for increased damping later in the stroke (pretty cool), and allow higher inflation pressures, are not the answer. Nearly $1,500 each and then Chevrolet hangs their lower mount way below the axle (vulnerable) is no kind of off-road solution. So, working with the nice equipment that we have in a JLUXR or JLURXR, I recommend 30 psi.

 

[Capt. Don]

Where do your numbers come from? I know what springs I have (0191AB) but don't know how those line up with the figures you have above. Does the 6100# figure line up with the 0191AB springs? In any event, that post you are quoting is from back in September but I am still not sure we have determined consistency regarding which springs were shipped with which configuration of the XR.

Don't care what everybody else has. Pull up your specific build sheet and it will tell you in pounds (#) what your Jeep has installed for springs.

 

[Capt. Don]

HaHa! OK, edited to "sidewalls." I still think that stiff sidewalls at 37 psi make a JLUXR pretty miserable to drive. There is a better handling, better riding, better traction Jeep Xtreme Recon hiding in there and you can find it at 30 psi. Amazing how much better the 1.5 inch lift and the XR specific shocks work with 30 psi in the 35s and allowing those big sidewalls to do their normal job, easing the initial impact absorbtion/harshness on shocks and springs, and the tires. I do not like to recommend something other than actual Jeep specifications, I really don't, but this is a big deal on a 2022 JLUXRHT. I am actually happy now with my XR suspension, lift, wheels and tires. I'm really dumb and hard-headed, I stuck with the Jeep specifications for inflation pressure for four months. Until my Colorado Jeep buddies shamed me (and so enjoyed doing it, "Don, are you dumb?") into remembering how 35s work on the road and off, and what inflation pressures each require. Even the Colorado ZR2 Bison with their electro-magnetic continuously adjustable shocks that improve this initial shock absorbtion and then adjust for increased damping later in the stroke (pretty cool), and allow higher inflation pressures, are not the answer. Nearly $1,500 each and then Chevrolet hangs their lower mount way below the axle (vulnerable) is no kind of off-road solution. So, working with the nice equipment that we have in a JLUXR or JLURXR, I recommend 30 psi.

And 16-18 psi off-road without beadlocks. If I could get my hands on a set of beadlock rings compatible with my Mopar XR wheels, I would go lower.

 

[Apexcars]

I agree with running lower pressure. I run my stock tires at 30 psi

 

[Plumbean]

Don't care what everybody else has. Pull up your specific build sheet and it will tell you in pounds (#) what your Jeep has installed for springs.

My build sheet tells me in pounds (6100 by the way) what the gross vehicular weight is of my XR. Whether or not they matched that up with the correct springs is a different matter. In my case, the answer appears to be "yes" but others have had issues.

 

[nyglt56]

My build sheet tells me in pounds (6100 by the way) what the gross vehicular weight is of my XR. Whether or not they matched that up with the correct springs is a different matter. In my case, the answer appears to be "yes" but others have had issues.

My build sheet also said this. However, when I weighed my Jeep for a PCS move it came in at 5643 with a 1/2 tank of gas and 40s. Just a note

 

[Plumbean]

My build sheet also said this. However, when I weighed my Jeep for a PCS move it came in at 5643 with a 1/2 tank of gas and 40s. Just a note

Gross Vehicular Weight includes the maximum payload you are supposed to load into the vehicle. So the actual weight being less than the GVW is not unusual.

 

[wanderer]

The only reason you need to increase up travel is if you put on flat fenders. Again the reason for the bumpstops is to protect your factory fenders from tires ripping them off. The XR is factory bumpstopped for 37s.

So help me to understand if it is bumpstopped for. 37 s couldn’t you run a shorter bump stop if you were sticking with the 35 In theory there should be ~1 inch more up travel available with the shorter. Tire before it hits the fenders. ? Do I have that. Correct? And if that is true a you also added. 1 inch spacer or slightly taller. Spring. Would you not have an additional 1 inch of up travel ? Given those 2 guesses. What would you have to do with the shocks if anything?

 

[Zandcwhite]

So help me to understand if it is bumpstopped for. 37 s couldn’t you run a shorter bump stop if you were sticking with the 35 In theory there should be ~1 inch more up travel available with the shorter. Tire before it hits the fenders. ? Do I have that. Correct? And if that is true a you also added. 1 inch spacer or slightly taller. Spring. Would you not have an additional 1 inch of up travel ? Given those 2 guesses. What would you have to do with the shocks if anything?

Correct, however the front bump towers are welded in. Removing the spacer in the rear is absolutely doable. The front would require cutting and either welding in new stock style bumps or swapping to hydraulic bumps. Adding a 1" spacer is the easiest way to gain uptravel. As far as shocks, in my opinion the stock ones are already too short, adding a spacer only further limits down travel. Aftermarket shocks and a 1-2" spacer are the easiest way to get the suspension really working on an XR. $600 in parts and now she flexes.

 

[Jtphoto]

So help me to understand if it is bumpstopped for. 37 s couldn’t you run a shorter bump stop if you were sticking with the 35 In theory there should be ~1 inch more up travel available with the shorter. Tire before it hits the fenders. ? Do I have that. Correct? And if that is true a you also added. 1 inch spacer or slightly taller. Spring. Would you not have an additional 1 inch of up travel ? Given those 2 guesses. What would you have to do with the shocks if anything?

Yes, you could shorten the bumpstop to get more uptravel. The next step is making sure the shocks you have also have a short enough compressed length. The bumpstops also protect the shocks from bottoming out.
In the big picture if you put a longer shock on and increase the lift 1” you have effectively increased your uptravel by 1” from your new ride height and with longer shocks also increased your droop.

Your flex is ultimately limited by your shock travel.

 

[Capt. Don]

That’s from the Jeep spec sheet.

My input is from a table of brake specifications for Wrangler models published by AnnDee4444 on the forum here. I have come to trust his technical input though I do not know how he/she comes up with it.

 

[SaintNick]

HaHa! OK, edited to "sidewalls." I still think that stiff sidewalls at 37 psi make a JLUXR pretty miserable to drive. There is a better handling, better riding, better traction Jeep Xtreme Recon hiding in there and you can find it at 30 psi. Amazing how much better the 1.5 inch lift and the XR specific shocks work with 30 psi in the 35s and allowing those big sidewalls to do their normal job, easing the initial impact absorbtion/harshness on shocks and springs, and the tires. I do not like to recommend something other than actual Jeep specifications, I really don't, but this is a big deal on a 2022 JLUXRHT. I am actually happy now with my XR suspension, lift, wheels and tires. I'm really dumb and hard-headed, I stuck with the Jeep specifications for inflation pressure for four months. Until my Colorado Jeep buddies shamed me (and so enjoyed doing it, "Don, are you dumb?") into remembering how 35s work on the road and off, and what inflation pressures each require. Even the Colorado ZR2 Bison with their electro-magnetic continuously adjustable shocks that improve this initial shock absorbtion and then adjust for increased damping later in the stroke (pretty cool), and allow higher inflation pressures, are not the answer. Nearly $1,500 each and then Chevrolet hangs their lower mount way below the axle (vulnerable) is no kind of off-road solution. So, working with the nice equipment that we have in a JLUXR or JLURXR, I recommend 30 psi.

Yeah Don, you are dumb. Kidding, but I lowered from 40 to 37 and was disappointed. Later on first day I dropped to 30 which since its been cooler its actually 28-29 cold. Much happier except the tpms light is annoying.

 

[Jtphoto]

Ive been running 24-26 psi in my 35s and 37s for the last 15 years with no issues and I put on 35,000-40,000klm a year. Chalk tests and inflation formulas will show you where you need to be.

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