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aurgathor

join:2002-12-01
Lynnwood, WA
kudos:1
Reviews:
·Frontier Communi..
reply to neonturbo

Re: Jeep Grand Cherokee almost rolls over during maneuver tests

I guess if someone tries it 'hard enough', or there are minor imperfections in the road, most anything can be rolled over with some 'luck' and persistence.
--
Wacky Races 2012!


Insight6

join:2012-08-25

1 edit
reply to Gbcue
It's mostly about the ratio of sprung vs unsprung weight. Vans and most SUVs have proportionately a lot more sprung weight.

Then the load in the vehicle, center of mass and tires can contribute to make the rollover potential or ease to rollover even greater.

Vehicles like vans and most SUVs are physically more vulnerable to rollover or lifting a tire or two. It's all about physics.

Even without an explanation one can just park a van, SUV, passenger car, and sports car side by side and intuitively tell which is most likely to lift a tire or roll in similar maneuvers.

I remember many years ago one of the TV news magazine shows like Sixty Minutes focused on the Suzuki Samurai and its propensity to roll or tip over. They were verifying test results of some testing agency. The vehicle was driven at X speed through a series of cones.

Suzuki denied the results and responded to the testers and or the news magazine. They had the chance to set the vehicle up any way they wanted. They then ran the vehicle through the same test at the same speed. The videoed their test. They then sent the unedited video to the news magazine showing the vehicle did not tip or roll over. Sixty minutes on camera showed the video to the testers for their show.

In the dealer video all though the vehicle did not tip over in the maneuver the right inside rear wheel came off the ground. The tester in watching the video for the show commented dryly and with some amazement that Suzuki would cause to be shown their vehicle lifting a wheel in reasonable turn that caused that wheel to lift off the ground.


Doctor Olds
I Need A Remedy For What's Ailing Me.
Premium,VIP
join:2001-04-19
1970 442 W30
kudos:18
reply to neonturbo
said by neonturbo:

(youtube clip)

»www.youtube.com/watch?v=ncohOWhKaAU Yes that is the one I could not find. Thanks!
--
What’s the point of owning a supercar if you can’t scare yourself stupid from time to time?


Darkfairy
Aeolus, your daughter flies.
Premium
join:2003-03-17
Tampa, FL
reply to Gbcue
This only proves the Grand Cherokee, while drivable on blacktop, is more setup and designed for offroad use. It is a proper SUV, designed to do what SUV's are supposed to be doing. 40 MPH abrupt turns on blacktop are not one of them.
--
Fairy Blessings,
Stefanie


Cho Baka
Premium,MVM
join:2000-11-23
there
kudos:2
Reviews:
·TekSavvy DSL
reply to Gbcue
Yes, I agree. All good SUVs should roll.



I guess the BMW in the video posted earlier is also designed for offroad use.
--
The talented hawk speaks French.

neonturbo

join:2009-02-27
Lansing, MI
Any car under the wrong circumstances can roll over. You have to know the threshold of what your vehicle is capable of. A Cherokee is not meant to compete with a Porsche 911 or Corvette on the track. The test drivers in both the Jeep and the BMW videos were doing extreme maneuvers.

I have driven many Corvairs over the years, they are the ultimate "roll over deathtrap". I have never rolled even one. I have done things that should have made them roll, but yet they did not. Cloverleafs at double to triple the posted speed is white-knuckle scary (but fun!) on 175-13 tires.


Darkfairy
Aeolus, your daughter flies.
Premium
join:2003-03-17
Tampa, FL
reply to Cho Baka
A vehicle designed for offroad use is more likely to have a soft suspension with greater travel. This increases its stability and maneuverability over uneven surfaces. It also increases the force of the sudden weight transfer when doing maneuvers such as the one demonstrated.

You can roll a formula 1 car given the right circumstances. The likelyhood is just reduced by the lower weight, harder suspension and low centre of gravity.
--
Fairy Blessings,
Stefanie


Cho Baka
Premium,MVM
join:2000-11-23
there
kudos:2
reply to Cho Baka
The sarcasm wasn't obvious?


Blogger
Jedi Poster
Premium
join:2012-10-18

1 edit
reply to Darkfairy
said by Darkfairy:

You can roll a formula 1 car given the right circumstances. The likelyhood is just reduced by the lower weight, harder suspension and low centre of gravity.

True, under the right circumstances even an F1 car can flip over. But on an even surface unless it struck something it would never flip or roll no matter what. You spin the wheel while going 180 down a straightaway and the car would simply spin without leaving the ground. There are many factors that keep it from flipping with unsprung weight stiff low suspension being probably the most influential.

Beezel

join:2008-12-15
Las Vegas, NV

said by Blogger See Profile
But on an even surface unless it struck something it would never flip or roll no matter what.

You need to change that up a little "on an even surface unless it struck something it would never flip no matter what".

All it takes is the right amount of air to get under the car in a lose of control and it goes flying.


Sniper3142
Slapsho3142

join:2002-01-25
Tustin, CA
reply to Gbcue
I currently own a 2012 Jeep Grand Cherokee.

This "test" was rigged and not even close to accurate.

My JGC is extremely stable. It handles corners better and has greater stability than my 2005 Toyota 4Runner had. And the 4Runner was equipped with the optional X-REAS Sport Suspension which increased its stability and corning performance.