
Driving Dynamics Lab: The Circle and the Square
Monday, January 28th, 2008
The parking lot was perfect; a thick crust of wet snow on ice, about an inch thick. Enough to show tire tracks. Walking behind my car, I see two pairs of tracks, one set smooth, perfect part circumference, and a second set. This set describes almost half a square, straight then an almost perfect right angle, then straight again to merge with the curve. Like I said, almost perfect.
The modern car is loaded with no shortage of safety features, not all of which help the proactive driver. The proactive driver uses all of the controls of the car to control it, including, as in this case, the handbrake. The handbrake turn is the cure for the common understeer, maintain momentum, press the handbrake button and hold it down, give the lever a judicious yank, and feel the car slew sideways with your inner ear. Compensate, but don’t overcompensate, to aim the car, as if you were aiming a gun, and roll into the throttle to proceed in the new direction that you have chosen.
My main concern with this Fit of mine, being the first car that I’ve own that had ABS, was whether the ABS would default to “ice mode” when I pull the handbrake? Ice mode essentially means no brakes at all, your diligent car waiting for the wheels to resume turning, i.e., the return of traction, before it even attempts to apply the brakes again. The locked rear wheels of the handbrake turn is what makes it work, but if it removes the ability to stop the car, that moots the technique for anything but sliding into a parking spot that you were barely molving into anyway. In addition to scaring girlfriends and goofing off, judicious use of the handbrake on snow and ice when in cornering situations on dry pavement lift throttle ovesteer would be more than sufficient is sometimes necessary. The Fit, by the way, barely lift throttle oversteers under the best of circumstances, so at the speeds that you can attain in winter, all you’ll do is plow, unless you use your right hand.
It take practice. I practice every year, first snow of the year, in the largest, emptiest parking lot thta I can find. Groping for the subtle shifts in C of G changes is a frangible skill, practice builds it up. So I found an especially empty lot this year, and drove in a wide circle, slowling adding speed until the car started to veer wide, I stepped on the brakes hard enough to engage the ABS, and then grabbed the other brake. To its credit, the Fit knew what to do; the ABS pulsed, I still had control of the steering, the rear wheels locked, and I tightened my turn radius, easy as pie. Or, easy as doing it six or eight times in a row and then getting the feel for it.
So, no worries, right? If you hold the handbrake too long, the car beeps at you, so it can sense you”re doing something that it doesn’t approve of. Then the ABS light went on one cold, cold morning, and it took much of the day before the ABS modulator came back on-line, so it won’t be until I get the ECU read before I know exactly what happened, and what, if anything, was the cause of it. But no problems since. And I am still making the circle and the square.
The parking lot was perfect; a thick crust of wet snow on ice, about an inch thick. Enough to show tire tracks. Walking behind my car, I see two pairs of tracks, one set smooth, perfect part circumference, and a second set. This set describes almost half a square, straight then an almost perfect right angle, then straight again to merge with the curve. Like I said, almost perfect.
The modern car is loaded with no shortage of safety features, not all of which help the proactive driver. The proactive driver uses all of the controls of the car to control it, including, as in this case, the handbrake. The handbrake turn is the cure for the common understeer, maintain momentum, press the handbrake button and hold it down, give the lever a judicious yank, and feel the car slew sideways with your inner ear. Compensate, but don’t overcompensate, to aim the car, as if you were aiming a gun, and roll into the throttle to proceed in the new direction that you have chosen.
My main concern with this Fit of mine, being the first car that I’ve own that had ABS, was whether the ABS would default to “ice mode” when I pull the handbrake? Ice mode essentially means no brakes at all, your diligent car waiting for the wheels to resume turning, i.e., the return of traction, before it even attempts to apply the brakes again. The locked rear wheels of the handbrake turn is what makes it work, but if it removes the ability to stop the car, that moots the technique for anything but sliding into a parking spot that you were barely molving into anyway. In addition to scaring girlfriends and goofing off, judicious use of the handbrake on snow and ice when in cornering situations on dry pavement lift throttle ovesteer would be more than sufficient is sometimes necessary. The Fit, by the way, barely lift throttle oversteers under the best of circumstances, so at the speeds that you can attain in winter, all you’ll do is plow, unless you use your right hand.
It take practice. I practice every year, first snow of the year, in the largest, emptiest parking lot thta I can find. Groping for the subtle shifts in C of G changes is a frangible skill, practice builds it up. So I found an especially empty lot this year, and drove in a wide circle, slowling adding speed until the car started to veer wide, I stepped on the brakes hard enough to engage the ABS, and then grabbed the other brake. To its credit, the Fit knew what to do; the ABS pulsed, I still had control of the steering, the rear wheels locked, and I tightened my turn radius, easy as pie. Or, easy as doing it six or eight times in a row and then getting the feel for it.
So, no worries, right? If you hold the handbrake too long, the car beeps at you, so it can sense you”re doing something that it doesn’t approve of. Then the ABS light went on one cold, cold morning, and it took much of the day before the ABS modulator came back on-line, so it won’t be until I get the ECU read before I know exactly what happened, and what, if anything, was the cause of it. But no problems since. And I am still making the circle and the square.
