AutoZone Québec, le forum de Essai-Auto.com

GAdriver wrote:Belles photos! Pourtant c'est supposé être un truck de offroad. Mais ça doit etre écrit en petit caractère que ces dommages sont pas garanties. Un peu comme la GTR, qu'ils annoncent à 3.7 secondes sur le 0-100, alors que c'est seulement possible en accomplissant une manoeuvre qui void la garantie et qui casse la transmission.

Jeece wrote:J'ai justement posté ces photos dans le thread de Fail hier. J'ai même utilisé le même qualificatif que toi.







C'est de valeur, parce Ford va probablement dire aux proprios actuels d'aller se brosser et mettre le design à jour pour les prochains modèles...

klinker wrote:Ce clip en dit long sur la rigidité du chassis des Ford
http://www.youtube.com/watch?v=HFNv4n7L ... ture=share" onclick="window.open(this.href);return false;

klinker wrote:Ce clip en dit long sur la rigidité du chassis des Ford
http://www.youtube.com/watch?v=HFNv4n7L ... ture=share" onclick="window.open(this.href);return false;

Karnov wrote:

klinker wrote:Ce clip en dit long sur la rigidité du chassis des Ford
http://www.youtube.com/watch?v=HFNv4n7L ... ture=share" onclick="window.open(this.href);return false;

On n'y voit pas le RAM...

Mike wrote:Belle infopub pour GM.

Basically, the core – the root cause – is that the vehicle is traveling too fast for the obstacle, and the truck is running out of travel. By a large margin. They're going too fast for the obstacle by a large margin. The frame is not the first item to yield in that condition – despite what's been theorized, the first thing when you do exceed the vehicle's travel capability [is that] you have a certain safety zone where you will hit the bump stop and nothing will happen. If you hit that same obstacle at an even faster speed, then you will yield the jounce bumper cup – that's the little piece of steel that holds the jounce bumper. If you hit that same obstacle at an even greater speed, then the next thing to go is the frame.

That energy has to be absorbed somehow, and we actually went through a fairly detailed FMEA [Failure Mode and Effects Analysis], so if you do happen to far exceed the suspension's capability, the safest thing for that vehicle is for the frame to yield. If you had an infinitely stiff frame, then what that would do is, the rear of that vehicle – the suspension – when that axle is going up so hard, so fast, it would 'donkey kick' the rear of that truck really high into the air. That's a very undesirable condition."

[...]

The other thing that's going on... we've had some reports that there's an aftermarket company offering aftermarket springs, and instead of the two or three-leaf of the production truck, they offer a multiple stack leaf, and what that does is, it actually deletes the jounce bumper landing pad, which is kind of critical.

[...]

We were anxious to have our side of the story told because our impression of what happened is that the vehicle performed very well in that kind of extreme maneuver.

They didn't lose control – the vehicle was very stable. Some other things that could have broken – like shock mounts or spring perches or axles – those have grave, grave consequences when they fail at 80 mph off-road. [They can] potentially cause a lot of damage to the vehicle. These guys could still drive their vehicles – they weren't stranded with a busted suspension out in the middle of the desert.