Monday, September 15, 2008

Techniques for inducing drift

The basic driving techniques used in drifting are constant, though each car and driver will employ some subset of these techniques. A similarity for all drifting techniques is to be smooth and practice. These techniques include:

1. Beginner techniques
These techniques do not use weight transition. Weight transition it’s techniques where employ a further concept of weight transition. When a vehicle has the load towards the front, the back wheels have less grip than the front, causing an oversteer condition that can initiate a drift.
), so are typically the first thing the novice drifter learns. However they are still used by the most experienced drifters, and require skill to execute properly. These techniques aim to induce a loss of traction on the rear wheels, either by locking the wheel (e-brake drift), or using enough power from the engine to break the traction force (power-oversteer and clutch kick).

2. Hand-brake drift
While the clutch is depressed, the hand brake (or Emergency brake) is pulled to induce rear traction loss. As soon as traction is lost, the driver releases the clutch, countersteers, and depresses the accelerator. This technique is used heavily in drift competitions to drift large corners, or to trim the car's line mid-drift.
When learning to drift using this technique it is important to first countersteer and wait for the car to stop rotating and face the right direction to exit the corner, and only then to press the accelerator to give the car more gas to keep it sideways. If accelerator is pressed too soon or too much, the car will spin out.

3. Power oversteer or Powerslide
It is usually done at the corner exit by stepping on the gas hard, to slide side ways out of the corner. It is most commonly employed by beginners because it teaches steering and throttle control without the danger of an actual entry oriented drift.
In low-power cars power oversteer can be achieved by applying excessive amount of throttle at the end of a shift. As you are releasing the clutch during a shift, or immediately before that while the clutch is still depressed, press accelerator all the way to send more power to the rear wheels than is necessary for a smooth upshift. If done during a turn, the car will begin to slide. This technique can be used to initiate a drift at very low speeds in an underpowered car (e.g., when shifting from 1st to 2nd gear), and to enter in a higher gear while accelerating all the way up to the turn (e.g., accelerate in 2nd on the straight and shift into 3rd as you enter the turn).
The sequence of actions is as follows:
• Accelerate in the straight line leading to the turn.
• Turn the steering wheel to begin the turn.
• Clutch in.
• Shift to the next gear.
• Floor the accelerator.
• Clutch out.
• Wait for the car to go sideways, then countersteer and proceed to exit the corner.
Depending on how much power the car is making it is possible to keep the gas pedal floored from the shift throughout the entire drift, and in a low-power car this is often necessary.



Nissan 240SX Shift Lock Drifting

4. Shift lock (compression slide)
Initiated by downshifting (usually from third to second or fourth to third, and using a very fast shift) instead of braking, without rev-matching, causing the drive wheels to lock momentarily. Helpful for very tight corners, allowing the driver to approach the corner at a slower speed and lower revs, while allowing quick acceleration when exiting the corner. This technique can be very damaging to the engine if mis-used as the ECU is unable to rev limit when the engine is oversped by the rear wheels. Premature downshifters are called "Rod Stretchers".

5. Clutch Kick
This is done by "kicking" the clutch (pushing in, then out, usually more than one time in a drift for adjustment in a very fast manner) to send a shock through the powertrain, upsetting the car's balance. This causes the rear wheels to slip. The foot should be at an angle (heel-toe) so the brake and gas may be pressed as well, this being needed to control speed and stop from spinning out in the drift.
Clutch kick can also be used during a drift to gain angle at the expense of speed. If the car is about to straighten itself out, kicking the clutch will cause it to rotate more. However since power delivery is interrupted while the clutch is depressed the car will lose some speed during the process.

6. Braking drift
This drift is performed by braking into a corner, so that the car can transfer weight to the front. This is immediately followed by throttle, which in an RWD car causes the rear wheels to lose traction. FWD cars can also use this technique as it does not depend on the rear wheels being driven. In FWD cars the front wheels are not allowed to lock due to the continuous power, the rear wheels locks easily due to weight transfer and due to the general front heavy design of FWDs. Good performance brake pads will help this technique.

7. Inertia (Feint) drift or Scandinavian flick
This is done by transferring the weight of car towards the outside of a turn by first turning away from the turn and then quickly turning back using the inertia of the rear of the car to swing into the desired drifting line. Sometimes the hand-brake will be applied while transferring the weight of the car towards the outside to lock the rear wheels and help the rear swing outwards. This type of drifting causes the car to accelerate faster afterwards, because of momentum built up while drifting.
Note that the actual scandinavian flick maneuver in rally driving is more complex than feint drifting. In scandinavian flick the tires are intentionally locked by braking hard right after turning a little away from the corner. While the wheels are locked, the driver applies steering input into the corner, adds throttle while still braking and then rapidly releases the brake pedal. This causes the car to slingshot itself through the corner.

8. Kansei, Lift off, or Taking In
By letting off the accelerator while cornering at very high speeds, cars with relatively neutral handling will begin to slide, simply from the weight transfer resulting from engine braking. The drift is controlled afterwards by steering inputs from the driver and light pedal work, similar to the Braking drift.

Other techniques

Dirt drop
This is done by dropping the rear tires off the sealed road onto dirt, or whatever low-grip surface borders the road, to maintain or gain drift angle. Also colloquially called "Dirt Turbo".

Choku-Dori/Manji (Pendulum)
Otherwise known as over-sway, this technique is done by swaying the car's weight back and forth on straightaways, using countersteer and throttle to maintain a large angle. This is a show maneuver that usually involves many cars following the same line. The car will be drifting straight and will be drifting side to side.

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