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#1
05-13-2010, 11:27 PM
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Car Roll
Just doing a little research for an idea I can't get out of my head. This is a three part question.
It is my understanding that the CG of the car body is generally located above the car's suspension. On turns, the body tends to roll out of the turn, making you lose traction on the inner tires, and exerting more force on the outer tires. The more the body rolls, the more likely the outer tires are to lose traction as well. If you could make the car body roll into the turn instead of out, would you? If so, by how many degrees? Same question applies for comfort. having the car body roll into the turn would effectively roll the seat with the driver and passenger to be closer to the axis in which the force is being applied, thus reducing the lateral force felt by passengers and driver. Last but not least, would having the body of the car roll into the turn make the car look more or less aggressive on the turn? Feel free to express yourselves!
__________________
'94 325i Sedan (project/dd) '94 530i (project/dad's) ---------------------------- '97 Z3 retired :( 
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#2
05-13-2010, 11:43 PM
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In 2007, Bose developed an active suspension that could do this sort of thing. I can't find a video of the car leaning the other way in a corner but I recall writeups that suggested that it would be better in most ways.
Anyway, check out this video: YouTube - Bose active suspension
__________________
'99 Z3 2.8 Coupe - SCCA ITR race car '03 540iT M-Sport (now with 6-speed!) - daily driver '04 Suburban 2500 8.1L - ultimate tow vehicle
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#4
05-14-2010, 10:00 AM
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Several years ago Volvo was working on a system that would counter act the turn by increasing the the height of the side that was experiencing the loads.
__________________
Olivia: 97 M3 sedan 5spd actively competing in SCCA STU, BMWCCA AAA 
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#6
05-14-2010, 02:08 PM
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Quote:
__________________
'94 325i Sedan (project/dd) '94 530i (project/dad's) ---------------------------- '97 Z3 retired :(
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#8
05-14-2010, 07:40 PM
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That BOSE suspension is pretty awesome!
BMW uses a hydraulic sway bar with it's dynamic drive system to keep the car level under cornering. It does an amazing job of keeping the car flat in the turns and really makes the big cars, like the 7-series, feel nimble.
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