Quote:
Originally Posted by e-revs
[font=Geneva, Arial, Helvetica, san-serif][size=2]The Rear Strut Bar is particularly useful for an FF vehicle. The Understeer behavior can be corrected by stiffening the rear chassis by installing a Rear Bar.
High attention is taken during the design and development stage to ensure the rear chassis is reinforced and strengthened in a proper way that it will not cause the vehicle body to undergo too much stress.
Rear Upper Bars is designed for vehicles with high roof and high CG (Centre of Gravity) such as MPV's, mini MPV's, SUV's and Hatch Backs.
Initially, Rear Upper Bar is invented specially for the 5 Doors Hatch Back cars. The 5 Door Hatch Back cars have weaker rear upper body due to their wide opening rear door. Under extensive investigation and actual road proving, it corrected the shortcoming of the vehicle’s swaying rear upper body.
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I don't mean to start any trouble, but how could any of that be correct?
Sure, stiffening up the rear of a car "can" reduce understeer, but how is a bar running from one upper corner of the body to the other, with no triangulation going to do anything but add weight up top?
Strut tower braces were originally intended to reduce the spreading of the upper strut mounting points under cornering load. In this particular case, there is nothing that mounts to those same spots other than the seat belts - no suspension components. Are you saying that under heavy stress the roof skin stretches?
Without triangulation, this piece doesn't do a thing. Take a cardboard box, cut off the top and bottom, and lay it on it's side, so you have a big open square [ ] (much like a hatchback car). If you add re-enforcement from only one side to the other, at the same height, the box will still collapse to the side. Triangulating or cross bracing this structure ( [/] or [X] ) would stiffen the back, but not just adding one bar up top.
If you want to fix understeer, buy a rear sway bar.