[torsen] Re: [s-cars] RE: Rear Stabilizer or Sway Bar
QSHIPQ at aol.com
QSHIPQ at aol.com
Wed Nov 22 05:39:02 EST 2000
In a message dated 11/22/00 12:04:33 AM Central Standard Time,
tedebearp at yahoo.com writes:
> > Many have intimately ;). Teddy, you should join the torsen list. IME
> > (summarizing a lengthy discourse) that center device isn't 'limited
> > it's a "no slip" device, which means it's biggest flaw is torque
> > based on turning radius *or* traction (documented in several papers).
> > doesn't always operate in the drivers favor.
> by the way, this discussion applies to acceleration. the torsen
> won't change handling balance in throttle-off conditions (such as
> when trailbraking). so you get a car that oversteers with light
> throttle and under braking, and understeers on the throttle. sounds
> like a mustang (heavy V8 in the front, not much weight in the back).
Be careful saying this, teddy, it's not quite right. A torsen has a
different bias ratio on acceleration torque, deceleration torque, and coast
mode. Coast mode (no torque/reverse torque applied = 50f/50r = U) is the
only one that is a constant. Don't forget, if you turn the wheel, you change
the bias ratio with torque (reverse torque) applied. The matrix is pretty
complicated, and would include a BR up to but not including a traction
argument. Once you have started to exceed traction, BR will quickly change
"again" to the slower spinning axle, which immediately causes a shift of
torque, regardless of slip angle input. The easiest way to remember this is
that this device is by definition it's an absolute traction device. Torque
Sensing absolute traction devices can be fooled into allocating torque based
on slip angle differences.
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