Thursday, 25 October 2012

Weight transfer, race car driving training.

 If you want a good start then the rear weight transfer can give help. It will give you more grip so that you produce less wheelspin. A smooth throttle is important. 

Oversteering is usually caused by the rear wheels, so when you accelerate the front wheels will oversteer, and this results in weight transfer which will aid recovery. 

Oversteer is not helped by acceleration, it will leave less grip, to oppose the sideways motion.

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Monday, 8 October 2012

On Circuit Support

Race Driving Improvement

How to pull a donut

Homer's favorite food is also one of the most dramatic show boating techniques you can do in a car. It has very little use on the track other than to celebrate your fast lap times!

What kind of car do you need?

Rear wheel drive is essential to perform sustained doughnuts, and you'll need enough power to spin the rear wheels and keep them spinning. This is a technique you won't want to use too frequently unless you have a set of rear tyres which you don't mind wearing out! Make sure all stability control systems are turned off, and it you are in an auto, lock the gear in first if possible.
Do not attempt this technique on the public roads!

How to do a doughnut

You can perform a doughnut in two slightly different ways and you don't need to be too hard on the clutch to pull one off. You can either have a rolling start, or spin the wheels from a standstill...
1. Spin the wheels. It's slightly kinder to your car to have a rolling start, this will allow you to fully release the clutch before inducing wheel spin. Approach the area where you want to perform the doughnut in first gear at low speed, ensure you're completely off the clutch then turn in hard and apply full throttle rapidly.
2. If you have enough power you'll find the rear wheels start to spin. Keep the revs up high in the power band and apply a certain amount of steering lock . Alternatively you can spin the wheels from a standstill while applying some steering angle to have the same effect.
3. You should find that the rear wheels lose traction and begin to cause the car to rotate, keep the revs high (you can even remain on the limiter if fitted) and you should complete a doughnut. You can modify the direction by steering at different angles and altering the throttle.
4. If you want to drive away from a doughnut ensure you make the necessary counter-steering adjustments early as the car will have a tendency to oversteer.
In summary a doughnut is a relatively simple and dramatic technique to perform with the right car. Do you want driver training? Please visits:
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Left Foot Braking.

Left foot braking is a technique used frequently in rallying, but can be equally useful on the road or track for:
  • Reducing understeer into a corner
  • Reducing drive loss through spinning wheels
  • Removing the pedal transfer time between accelerator and brake

Reducing understeer into a corner

The theory here is that you can feather the brakes into a corner (trail braking), while transitioning to progressive throttle at the apex. This can lead to a very smooth transition between braking and acceleration and is less likely to unsettle the car through unwanted weight transfer. It also keeps the weight at the front of the vehicle for as long as possible, thus providing more grip, a better turn in and reduces the possibility of understeer.

Reducing drive loss through spinning wheels

This technique is particularly useful for a front wheel drive car without a limited slip differential. On the exit of the corner, it is a common symptom for one the unladen front wheel to spin while applying throttle. This spinning wheel is preventing all of the power from transferring to the road and thus slowing the exit speed. By feathering the brake with the left foot, this can prevent or reduce this wheelspin, and get a better exit.

Common mistake when learning to left foot brake

Left foot braking is an advanced technique, and should only be attempted after lots of practice. When learning to left foot brake, you'll initially press the pedal far too hard as you'll be used to the action of pressing a clutch all the way to the floor. It takes time to re-programme the 'muscle memory' of your foot and leg, and a bit of empty tarmac is highly recommended.

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