Thursday, December 23, 2010

Drifting - part 1

This time we will discuss how to drift. We have talked about the brake drift technique before, but we did not talk about the basic movements, As always we try to give as much info as possible, so therefore we will discuss it today.

First of all you need a rear wheel drive car. a 4 wheel drive is also possible, if it has a function to switch to rear wheel drive. You can also remove the front axles and lock the center diff, but this will create more stress on the drive train. If you have a faster cart then its easier to drift, but its possible to drift a low powered car. It is also a good idea to have an LSD, rollcage and a bucket seat to cope more with the lateral movements and to be safe in case it goes wrong. A saying about drifting is: "Its not a matter if you crash your car, but when you crash it." Its also a good idea to sport some cheap tyres because they will be gone in a flash. 
We've split the drifting process into four main stages
A. Turning in
B. Inducing oversteer
C. Controlling and sustaining the drift
D. Exiting the drift



A. Turning In
When learning to drift, our advice is to approach a tight 30mph turn in second gear at about 3000rpm - this will give you a decent amount of torque to keep the rear wheels spinning once you've induced oversteer. Remember drifting is not the fastest way round a corner so you're not trying to set speed records here. Turn in and aim to apex about half way round at the geometric apex (the green line in Diagram 1 above). If apex too soon you can find that the car will run wide and you'll have to compensate by ending the drift early, too late and you'll be on the straight early and won't have any time to sustain the drift. With practice you'll be able to drift round the corner in a smooth arc which follows the racing line.

Once you have mastered drifting along the racing line, you'll then be able to start the drift earlier and sustain it for the entire corner, and even adjust the angle or steering simply by adjusting the throttle.

B. Inducing oversteer
At the apex of the corner you need to initiate oversteer, which sometimes is more difficult than it sounds. Drifting has developed its own unique terminology for techniques to 'get the back out' which are explained below. Remember that if you have a modern car with clever electronic stability control systems you'll need to turn these off first.


Power / Power over / Power slide

If you have a powerful car it should be possible to break traction simply by accelerating sharply mid bend - this is the preferred method of inducing oversteer as it is easy to control and repeat. If you increase the throttle too slowly it's unlikely anything other than understeer will occur, too hard and the car may spin. You're aiming for a sharp, sustained hit of power in the right gear - practice will help you get the balance right. In case your car is not that fast, then we advise you to practice in the snow

Clutch Kick

Clutch kick is a useful technique to use if you do not have a particularly powerful rear wheel drive car. The trick here is to enter the corner and dip the clutch. Raise the engine revs to near the red line, and then release the clutch at the apex. The resulting shock load of torque sent through the driveline should break traction at the rear wheels, thus invoking oversteer.

Changing down / Shift lock

"Shift lock" describes the action of locking the rear wheels momentarily by changing down a gear (or two) rapidly without rev matching. Once you're back on the gas this will give you the benefits of more torque at the wheels due to the lower gear, with high revs helping sustain the drift.

Lift off / braking
Entering a corner fast, then lifting off the accelerator at the apex can cause oversteer due to the resulting forward weight transfer which reduces grip at the rear tyres. If you drive a particularly stubborn car, a quick dab on the brakes may help.
 In this post we have more information about the Brake Drift.

Lift off/kansei
This is only possible on high speeds. When you enter a high speed corner you have to release the throttle. Because of this the car starts to oversteer a little bit. This is only possible with neutrally balanced cars and not with understeering cars. 

Handbrake / E-brake
If your car refuses to get tail happy, there is always the option of using a hydraulic handbrake. A sudden sharp application and release mid corner will break traction at the rear wheels. Get on the throttle as soon as the back steps out.


Scandinavian flick / feint
Flicking the car the opposite direction to the corner, just before turn in will generate a rapid lateral weight transfer which can unsettle the car enough to flick the back out. As soon as you turn in, get on the gas and prepare for the resulting oversteer.


Jump drift
This is probably one of the more risky methods – the trick here is to put two wheels onto the inside edge of the track while cornering, with the resulting bump unsettling car enough to break traction at the rear. Use with caution!

Maintaining the drift

Once the back starts to come round (1 in Diagram 2) you need to act quickly. Keep the power on (you might be surprised how much power is required to sustain the drift) and quickly counter-steer in the desired direction of travel (2), and balance the throttle to alter the attitude of the car.
 
To sustain the drift you need to keep the power on to keep the rear wheels spinning - about 80% throttle is the rule of thumb (although you'll need less in slippery or low traction conditions). If the back comes round too far, gently ease off the throttle and apply additional steering lock to correct the slide. If you're finding it hard to keep the slide going, you may need to use more power or take the corner slightly faster.

 
 
Ending the drift

Finishing the drift and getting the car straight again can be tricky - if you end the drift too quickly you might find the car starts to oversteer in the opposite direction, leading to 'fishtailing' and a pendulum effect which can be hard to control. The trick is to ease off the power smoothly and turn the steering rapidly and decisively back to the straight ahead position. Don't let the steering run through your hands as this won't give you the control you need.
If you have these steps under control then drifting will be a lot easier. Afterwards you can try to start the drift earlier, going faster and improve transitions. The key is to keep practicing

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