Car Spoiler

A spoiler is an upside-down airfoil located in the back of a car whose objective is to provide a downward force on the moving vehicle. This downward force is in theory used to increase the stability and the maximum acceleration that the car can sustain. Imagine a car without a spoiler moving toward the left on a flat surface with an acceleration ax.


Drawing a free body diagram of the moving vehicle ( neglecting air friction for simplicity) and utilizing Newton’s second law on both the horizontal and vertical direction, one can find that the car maximum acceleration (ax) is equal to the static coefficient of friction between the tires and the road (μ) times the gravitational acceleration (g). Note that the car’s maximum acceleration does not depend on the mass of the car (m). Therefore, the only practical way to increase the vehicle  max acceleration would be to increase the friction between the tires and the road since the gravitational acceleration cannot be easily changed.


Drawing a free body diagram of a similar vehicle but this time including the aerodynamic force provided by the spoiler (Fs), one can deduced that the maximum acceleration of the car (ax) has increased compared to that of a car without a spoiler.


Two things are important to note:

1) The maximum acceleration that a car with a spoiler can have increases as the aerodynamic force provided by the spoiler increases

2) The maximum acceleration of a car with a spoiler depends on the mass of the car (as mass goes down, max acceleration goes up) while the maximum acceleration of a car without a spoiler does not depend on the mass of the vehicle.

So far, so good; however, there is a catch. Since the aerodynamic force of the spoiler (Fs) pushes down of the car on the back end, this force tends to rotate the car in such a way that the front wheels of the vehicle tend to be lifted up and the normal force on the front tires is reduced while the normal force on the back tires is increased. What does this means? For a front wheel drive vehicle, this means that the car’s maximum acceleration is actually diminished. For a back wheel drive vehicle, this means that the car’s maximum acceleration is in fact increased.


An increased maximum acceleration would also be true for a 4-wheel drive vehicle. Therefore, for a front wheel drive vehicle, a spoiler is more an accessory for looks. Nevertheless, for street legal vehicles, most of the time the max acceleration is limited by the engine’s capacity and not the friction on the road. For a formula 1 cars, a spoiler plays a very important role in stability and maximum acceleration.


  1. This proves that a spoiler on your back is useless without frontal down force, doesn't matter if you have RWD,AWD or FWD. Sure you gain traction on your rear wheels, but traction is useless without control.

    A spoiler should at least be paired with an airsplitter.

  2. The advantage of setting up a spoiler on your car is to help sustain traction at high speeds. Usually, when a car runs extremely fast the air pressure raises the car, that makes it hard to control the car with no danger of getting it spin out of control. Spoilers, like , pushes the rear of the car down to ensure the tires can grip the street much better and improve stability.

  3. If you are 55 years of age or more you may have noticed your automobile insurance rates creeping up. They don't have to remain high, however. Talk to your insurance agent and see if your company offers a discount for Visit site seniors who have successfully completed a refresher driver's course. Many companies offer a monthly premium discount of as much as 10% to qualifying seniors.

  4. Call insurance is among the leading suppliers of injury insurance round the world. In fact, Call Insurance is additionally enclosed within the results of your search and perhaps you skipped it. Car Insurance Brandon FL

  5. While far reaching car insurance covers any unintentional crisis, if there should be an occurrence of long haul wounds that call for proceeding with treatment, therapeutic insurance strategy will likewise be important. aami car insurance

  6. One answer, trust it or not, is to get an utilized auto from a closeout. Government barters happen constantly and are an extraordinary place to discover utilized vehicles. These utilized autos available to be purchased are not your keep running down old junkers. No, they rather have a tendency to be more up to date autos typically from inside the previous 10 years or less. dodge dealership in south carolina

  7. A sub-standard accessory can negatively affect your car performance and on the other hand can empty your wallet because you may have to get it replaced key shell replacement

  8. You ought to dependably approach them for quite a while to consider it.
    Acura Bolt Pattern

  9. This comment has been removed by the author.

  10. The exact opposite thing you need to need to manage is an awful auto employ organization that doesn't value your a lamborghini in italy

  11. I’m excited to uncover this page. I need to to thank you for ones time for this particularly fantastic read!! I definitely really liked every part of it and i also have you saved to fav to look at new information in your site.Elia & Ponto