Your steering is not loose. Rant warning.

[Oscar Indy]

This derailed.
Please delete

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[Tim]

I'm sorry but you are wrong. I drove a Sport S Max Tow owned by a close relation of mine on a multi-state trip and the steering was definitely loose. No doubt about it. Period. The steering box on that JT is either faulty or not adjust correctly. How can I say for sure? I own a Rubicon that drives normally. I've driven both normal and afflicted JTs fairly extensively and the ones with a problem have a much bigger problem than incorrect tire pressure.

That is all I have to say on the matter. Carry on.

 

[Oscar Indy]

I'm sorry but you are wrong. I drove a Sport S Max Tow owned by a close relation of mine on a multi-state trip and the steering was definitely loose. No doubt about it. Period. The steering box on that JT is either faulty or not adjust correctly. How can I say for sure? I own a Rubicon that drives normally. I've driven both normal and afflicted JTs fairly extensively and the ones with a problem have a much bigger problem than incorrect tire pressure.

That is all I have to say on the matter. Carry on.

Care to take a bet on what that family members tire pressure is set at? I got money says 42+- 3psi. Because that is what the factory sets them at for shipping so they don't get flat spots. Their dealer should have lowered the psi during check in. I have actually posted the PDI sheet in another thread. And there are tons of posts showing that the dealer didn't do a proper pdi. Call the family and ask them.

 

[Gladiator Brad 704]

In your opinion what should the cold tire pressure be on a stock 2020 Jeep Gladiator Rubicon with the factory supplied Faulken A/Ts?

 

[Oscar Indy]

In your opinion what should the cold tire pressure be on a stock 2020 Jeep Gladiator Rubicon with the factory supplied Faulken A/Ts?

I did the chalk test on mine when I got it home and came up with 31 psi.

That 36 psi is over inflated to i.prove mileage for the window sticker and C.a.f.e standards.

 

[ShadowsPapa]

I need to get something off my chest so
I'm gonna rant here a little bit. I've helped hundreds of people fix this issue of flighty steering over several generations of Jeeps. So be warned. <Rant on >

I spent way to much time trying to explain a simple concept to a guy today.

Guy is claiming he's gonna sue Jeep because his Jeep on 37s wanders to much. After LOTS of back and forth and some choice insults it turns out he's doing exactly what I told him he was doing and wouldn't accept he was wrong.

He was running 35 psi in a 37x13.5r17. the factory tire pressure on the door is 36. Well no shit it drives like crap. You are riding on rails. The concept is simple it's not the pressure you need to support the weight it's the volume of air.

Simple way of putting it you need the same amount of air on a 33 as you do on a 37. Logically if you put the same amount of air in the two sizes of tire the bigger one is going to be a lower psi. So by putting the same pressure in a 37 you have dramatically over inflated the 37.

He tried to tell me that I was wrong and that air pressure is a bandaid fix and that my tires won't last 10k being " under inflated."

You can lead a horse to water but you can't make an idiot understand simple logic. Good luck with that lawsuit buddy. Maybe stick to bro trucks.

What really chaps my ass is this guy has thousands of subscribers on YouTube and is either a moron or trying to cash in on sensationalism making a big deal out of his own mistakes. My money is on both.

So if you are reading this thinking your steering is a bit loose on over sized tires try deflating them a bit. I am sitting at 26 psi cold to keep me under 30 hot. At 30 it starts to wander. This is on 37x12.5 r17

Sorry, It's the PRESSURE that supports the vehicle.

SCIENCE - pressure against a given surface = force.

Plus, you don't MEASURE the air in volume, you measure in PRESSURE, PSI.

It's the same as hydraulics.
You are partially right - the end result is right but the explanation is not.
To give the same force on an object, if the surface is larger, you use less pressure, lower PSI.
But it's not the volume, it IS the pressure - the pressure acting on a surface -
so you are partially right, it's a larger tire, more surface on the ground so you use LESS pressure to support the same weight.
On the other hand, there are other factors at play, too - on my cars with much smaller tires, I run 28-30 and I'd never run that low in my LARGER Jeep tires. Taller doesn't mean larger footprint. You must consider the width, aspect ratio, the foot print.
So smaller tire may not run more pressure, smaller tire may run less depending on the rubber on the ground since it's PSI acting on a surface - the rubber that contacts the road, that supports the car.

Here's proof of concept -

you lay large sheets of paper in front of, behind, to the inside of, and the outside of one of the tires. The paper should overlap. Sort of form a box around the tire with the paper.
Put pencil marks on the paper where they overlap - so you can remove the paper from around the tire and reassemble your "square".
Remove the paper from around the tire, reassemble them on the floor or a table and line them up exactly as they were around the tire. Now measure the square in the middle - that's the foot print of the tire. Figure the square inches of that area.
Measure the air PSI of that tire - for example, if it's 35 psi, take 35 times the square inches of the square made by the paper.
Do this for each tire - surround the tire with the paper forming a square around the tire. Figure the tire footprint using that paper, figure the square inches, then take the pressure in THAT tire times the square inches of that footprint.
Add them all up - should be about what your car weighs.
35 psi in a tire, say the paper measure was 6" x 5" for 30 square inches. 35 x 36 is 1050
If you got that for each tire, your vehicle weighs about 4,200 pounds.
If you inflate each tire more, you decrease the tire's foot print on the floor, so you take the higher psi times a smaller square inches and end up about the same. Lower the tire pressure to 30 psi you increase the tire on the floor, more square inches, same result in the end.
The air pressure holds your car up - not the tire. Pressure per square inch applied to an area is force - force supporting the weight of the car.

You would have less pressure in a larger tire because that pressure is working on more surface.

You risk over-heating the sidewalls if run too low. If the door sticker was 36 I'd run just a bit under that. Bandaid dealing with wander by underinflating tires.
I'll bet that my tires always outlast yours. Always.

Flat spots are a thing of the past - I collect and restore classic cars. They often sit 4 to 5 months, Never have had flat spots.
o one I know in my hobby has ever had flat spots since modern radials. We have discussed it at length in the forum I operate.

 

[ShadowsPapa]

I did the chalk test on mine when I got it home and came up with 31 psi.

That 36 psi is over inflated to i.prove mileage for the window sticker and C.a.f.e standards.

Did that old chalk test on mine, too - 38 psi and the pattern came out PERFECT.

That PSI is the TIRE MAKERS recommendation - go against that and they may not help you with warranty. It's not what Jeep says, it's what the tire makers recommend for a given vehicle weight and load.
I sold and handled tires for years as a professional tech.

 

[Oscar Indy]

Sorry, It's the PRESSURE that supports the vehicle.

And that's why peoples eyes roll back in their head when people like us try to explain why. You went to complicated for normies.

K.I.S.S.
Same volume of air in two different size containers will net different psi. The pressure does hold up the wall but the quantity of pressure necessary to support the same weight is different based on volume.

 

[Oscar Indy]

Did that old chalk test on mine, too - 38 psi and the pattern came out PERFECT.

That PSI is the TIRE MAKERS recommendation - go against that and they may not help you with warranty. It's not what Jeep says, it's what the tire makers recommend for a given vehicle weight and load.
I sold and handled tires for years as a professional tech.

You are also in an overland. Smaller volume with a shorter tire and taller rim.

 

[ShadowsPapa]

And that's why peoples eyes roll back in their head when people like us try to explain why. You went to complicated for normies.

K.I.S.S.
Same volume of air in two different size containers will net different psi. The pressure does hold up the wall but the quantity of pressure necessary to support the same weight is different based on volume.

You missed the basic science concept - PSI against a given area. IT's the PRESSURE, not the volume.
PRESSURE supports the vehicle and I proved it with my deal on how to weigh your car/truck.
Volume has nothing to do with holding the vehicle up. I was straight A 4.0 in science (and college for that matter) and I have no clue where you got your stuff from.
The same volume OF AIR in a larger SPACE nets lower pressure, but it's pressure that supports the vehicle, period.
PRESSURE pushing against a surface. More pressure in PSI on the same surface means more force.
Look it up.
35 psi on a 10 square inch surface means 350 pounds of force. So 350 pounds can be supported.
Put the same 35 psi on a 5 square inch surface and 175 pounds can be supported.
Put 30 psi on that 10 square inch surface and 300 pounds can be supported.
You are using pressure in PSI working on the footprint of that tire to hold up the weight of the vehicle.
No one uses VOLUME to fill tires so I have no idea why you are talking about volume - no one else is.
Only pressure in PSI working on the foot print of the tire is needed, leave volume out of it - that is what complicates things.

 

[Oscar Indy]

You missed the basic science concept - PSI against a given area. IT's the PRESSURE, not the volume.
PRESSURE supports the vehicle and I proved it with my deal on how to weigh your car/truck.
Volume has nothing to do with holding the vehicle up. I was straight A 4.0 in science (and college for that matter) and I have no clue where you got your stuff from.
The same volume OF AIR in a larger SPACE nets lower pressure, but it's pressure that supports the vehicle, period.
PRESSURE pushing against a surface. More pressure in PSI on the same surface means more force.
Look it up.
35 psi on a 10 square inch surface means 350 pounds of force. So 350 pounds can be supported.
Put the same 35 psi on a 5 square inch surface and 175 pounds can be supported.
Put 30 psi on that 10 square inch surface and 300 pounds can be supported.
You are using pressure in PSI working on the footprint of that tire to hold up the weight of the vehicle.
No one uses VOLUME to fill tires so I have no idea why you are talking about volume - no one else is.
Only pressure in PSI working on the foot print of the tire is needed, leave volume out of it - that is what complicates things.

You are the only one struggling here bud.

 

[Scrubb84]

I get that there are a lot of stupid ppl out there, but if your trying to say that some of our steering boxes(sector shaft) do not have a problem just because one guy doesn’t know psi, then you my friend are part of the problem. Just sayin

 

[Oscar Indy]

I get that there are a lot of stupid ppl out there, but if your trying to say that some of our steering boxes(sector shaft) do not have a problem just because one guy doesn’t know psi, then you my friend are part of the problem. Just sayin

Sector shaft play is a potential issue. I'd hesitate to jump to that on a new vehicle until all other aspects had been thuroughly vetted.

 

[futzin']

a bit loose

over sized tires

deflating them a bit

seems to me that these items don't apply to almost all folks here who have a dramatic steering issue on their new, stock JT.

 

[ShadowsPapa]

You are the only one struggling here bud.

LOL - that's funny. You speak double-talk with your volume stuff while I have science and examples behind me.
You are the one struggling when you say people don't get what you say. There's a reason - it makes little sense.
Shade-tree stuff.

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