How much pitch & roll is too much?

How much roll is too much?


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BillG

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Perhaps, but that's only theoretical and apparently due to the ground's atomic structure (specifically, multiple electron shells) and electromagnetic repulsion. Due to quantum mechanics and the tunneling effect, however, there is a small non-zero chance that at greater than 90 degrees, your Jeep will pass through the planet an into an interstitial void. In this case, your warranty and comprehensive insurance coverage no longer apply.
But if two people on opposite sides of the earth each drop a slice of bread on the ground at the same time, the whole world becomes a sandwich.:idea:





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Lorenc

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I was at 25 yesterday and it was feeling sketchy, but stayed shiny side up. Incidentally, I’m on 40’s with a 3.5” lift
 

freddiegs

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I've seen 31 degrees twice. The first time i thought i was going to have to pull the seat out of my @$$
 

TxJeepers

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Been up to 27 roll and 32 pitch. Not same time! But it’s when you do get into both that it starts getting even more real.
 

Chubrocker

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I hit 27 degrees this past weekend. Butt puckered up for a second when the tire slipped. Will try to push it farther next time to find your answer :rock:
30 isn’t too bad. Got a lil worse later at SMORR Jeep Jamboree today
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LUV2JEEP

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I decided to try my first hill.....

Do I get man points or stupidity points?

I have 3.5" metalcloak lift with 38" tires.

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UNC Rubicon

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I was at 27 roll last weekend. I couldn’t imagine much more, to be honest.

I’ve been at 36 pitched down. Was fairly intense but it could handle a lot more.

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MTKMAN

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Pitch, roll, but no mention of yaw anywhere? How do you make minor adjustments?? Jk... I’m surprised no one has geeked out and built a database for certain lifts, tire size, ect. I’m sure there is a physics/ math wiz on here that has a formula given “X” amount of weight, at certain ride height off the ground can tolerate “x degrees angle” before the Jeep goes tits up and we’re in the market for a new top.

This is all interesting and I’ve come to the realization I should probably pay more attention.
 

Matstery

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It is a physical fact that any object will tip over only when its center of gravity gets outside its base of support. A jeep's base of support is easy to measure -- it is simply the vehicle's track width. The center of gravity, however, is not so easy to measure. A stock, static vehicle by itself will have a very precisely located CoG, but fuel tank levels, lift kits, mounted accessories, and occupants have a huge effect on the dynamic CoG -- especially the number, placement and weight of occupants. For instance, a single occupant in the driver's seat will raise the CoG of the vehicle slightly and move it a little to the left. A driver plus two passengers in the right front and right rear will raise the CoG even more, but move it slightly to the right. Yes, placing two occupants on the uphill side of your vehicle will help significantly.

As long as you keep your CoG over your track width your are in good shape, provided no additional force is applied (like momentum) which would swing your CoG past the tipping point.

In the Wrangler diagram below, if you assume the CoG is at the center of the spare tire mount (quite conservative, even with four occupants), I calculate the rollover angle would be roughly 40-degrees. It's easy to see how lowering the CoG would increase this rollover angle.

Jeep Roll Angle.png
 

JIMBOX

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Very good info--

One bit of additional advice, is to make damn sure that any CARGO EQUIPMENT is WELL SECURED !

W.E

JIMBO
 

spaghettipie

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Loving all things cars, I go to a lot of car shows & did the "Camp Jeep" experience several times. On stock Jeeps (unbelievably all models from the Renegade to the Wrangler) they take you up and down a 35 degree pitch approach/departure 18' tall 'mountain', and a 25-30 degree wedge to experience roll & articulation.

Both the pitch and roll angles were pretty impressive... while I love watching what people can do with their wranglers on extreme trails, that little course that all the models can manage confirmed to me that stock is all I personally am willing to handle! ;-)
 

Matstery

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Loving all things cars, I go to a lot of car shows & did the "Camp Jeep" experience several times. On stock Jeeps (unbelievably all models from the Renegade to the Wrangler) they take you up and down a 35 degree pitch approach/departure 18' tall 'mountain', and a 25-30 degree wedge to experience roll & articulation.

Both the pitch and roll angles were pretty impressive... while I love watching what people can do with their wranglers on extreme trails, that little course that all the models can manage confirmed to me that stock is all I personally am willing to handle! ;-)
Agreed! A bone-stock Wrangler is capable of some pretty amazing feats of physics.
 

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