What Is a Soft Limiter on a Car

Is your car’s soft limiter malfunctioning? Are you looking for ways to fix it or understand what it is? Then you’ve come to the right place! In this article, we will explain to you What is a Soft Limiter on a Car, why it is important, and how to troubleshoot it.

A soft limiter is an electronic device that controls the speed of your vehicle. It prevents your car from exceeding a certain speed limit – usually set by the manufacturer. This helps protect your car’s engine and other parts from potential damage due to excessive speeds. Additionally, it can also be used to improve fuel efficiency, reduce emissions, and maintain safety on the road.

Having an understanding of what a soft limiter does and how it works can help you make sure that your car is running optimally and safely. Keep reading to find out more about this important feature of your vehicle!

A Soft Limiter on a car is an engine control unit (ECU) feature which limits the engine’s revs to a predetermined level. This is done to prevent over-revving the engine and causing excessive wear and tear.

What is a Soft Limiter?

A soft limiter is an electronic device installed in a car that restricts the engine’s maximum speed to a pre-set limit. This limit can be adjusted according to the driver’s preference. The soft limiter works by cutting off fuel supply or spark to the engine when it reaches the pre-set limit, thus preventing over speeding. It also helps reduce wear and tear of the car’s drivetrain components, improving its longevity and efficiency.

Benefits of Installing a Soft Limiter in Your Car

Installing a soft limiter in your car has several benefits, some of which are:

  • Safety: The most important benefit of installing a soft limiter is the improved safety it offers. By limiting the maximum speed of the engine, it drastically reduces risks associated with over-speeding and reckless driving.
  • Fuel Efficiency: A soft limiter helps in reducing fuel consumption by preventing over-speeding. This also leads to improved fuel economy as less fuel is used for travelling at higher speeds.
  • Less Wear and Tear: Installing a soft limiter prevents excessive wear and tear on different drivetrain components, thereby improving their longevity and overall performance.

How Does a Soft Limiter Work in a Car?

A soft limiter is a device that can be installed into a car to limit the speed it can travel. It works by using sensors in the car’s computer to detect changes in speed and adjusts the throttle accordingly. This means that the car will not exceed a certain speed, even if the driver accelerates too quickly.

The soft limiter is designed to keep drivers safe, and it is most commonly used in cars with manual transmissions. It can be set to allow the driver to accelerate up to a certain speed, then automatically limit acceleration as soon as that speed is reached. This prevents drivers from accidentally exceeding the speed limit or driving too fast for conditions.

Soft limiters are also useful for preventing damage to cars due to excessive engine revving or excessive tire wear caused by speeding. They can also help reduce fuel consumption by limiting how much fuel is used when accelerating.

The soft limiter works by monitoring the engine’s revolutions per minute (RPM). If it detects that RPMs are rising too quickly, it reduces the amount of fuel being delivered to the engine, thus slowing down acceleration and limiting maximum speed. The amount of fuel reduction depends on how quickly the RPMs are rising and how much power is being requested from the engine.

There are two main types of soft limiters: Active and Passive. Active limiters require an input from either a button or switch, while passive limiters work automatically without any input from the driver. Both types of limiters work in similar ways, but active ones allow drivers more control over their top speed.

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Soft limiters are becoming increasingly popular as they provide an easy way for drivers to stay safe on the road while still getting good performance out of their vehicles. They are relatively inexpensive and easy to install, making them an ideal choice for those who want more control over their vehicle’s performance without sacrificing safety.

Different Types of Soft Limiters Available for Cars

Soft limiters are devices that control how much power your car can deliver. They are designed to prevent drivers from taking their cars beyond the maximum speed they can handle. Soft limiters allow drivers to enjoy the performance of their vehicles while still maintaining a safe and steady speed.

The most common type of soft limiter is the vehicle speed limiter. This device limits the maximum speed of the car and prevents it from exceeding a certain predetermined speed. It is usually programmed into the computer of the car, and can be adjusted depending on the preferences of the driver. This is a great way to ensure that your car does not exceed its recommended speed limits.

Another popular type of soft limiter is the engine rev limiter. This device limits how fast your engine can rev up, preventing it from reaching dangerous levels. It also helps to ensure that your engine runs smoothly, preventing it from overheating or damaging itself. It is important to set this limiter correctly, as too low or too high a setting can cause problems with your engine’s performance.

Soft limiters are also available for brakes and steering systems. Brake limiters restrict how hard you can brake, preventing you from locking up your wheels and skidding out of control. Steering limiters reduce how much you can turn your wheel at any given time, making sure that you don’t accidentally steer off course in a tight corner.

Finally, many cars come with adjustable suspension settings which allow drivers to fine-tune their ride comfort and handling performance. These adjustable suspension settings allow drivers to tailor their cars’ ride quality and handling characteristics according to their own preferences and driving style.

Pros of Installing a Soft Limiter in Your Car

Soft limiters are a great way to increase the performance of your car. By reducing the amount of torque delivered to the wheels, they can help you achieve higher speeds, faster acceleration, and better handling. They also reduce the risk of engine damage due to over-revving or excessive torque delivery.

One major advantage of installing a soft limiter is that it will increase your car’s power output. This is because it adjusts the amount of power that is delivered to the wheels when accelerating or decelerating. This can result in improved acceleration and handling. Additionally, soft limiters can also reduce fuel consumption and provide smoother shifts between gears.

Another advantage of installing a soft limiter is that it can help protect your engine from damage due to over-revving or excessive torque delivery. By limiting the amount of power delivered to the wheels, you can prevent your engine from running at too high an RPM for too long which could lead to serious damage.

Finally, installing a soft limiter in your car can also help improve its overall performance. By reducing the amount of power delivered to the wheels, you will be able to achieve higher top speeds and quicker acceleration times which means better overall performance for your vehicle.

Cons of Installing a Soft Limiter in Your Car

Although there are many advantages to installing a soft limiter in your car, there are also some potential drawbacks as well. One potential issue is that they may reduce fuel economy by limiting how much power is being delivered to the wheels during acceleration and deceleration. Additionally, they may also cause some vibrations due to the sudden reduction in torque when shifting gears.

Furthermore, installing a soft limiter may require additional maintenance if not properly adjusted or maintained. Finally, they may not be suitable for all driving conditions as they may limit how much power can be delivered under certain conditions such as wet roads or sharp turns where more grip is needed from the tires.

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Cost of Installing a Soft Limiter in Your Car

The cost of installing a soft limiter in your car depends on the make and model of your vehicle. Generally, it will cost around $200 to $500 for the parts and labor. However, if you choose to install it yourself, you can purchase the parts for much less.

Soft limiters are electronic devices that help improve acceleration and fuel economy by limiting the amount of power that can be delivered to the wheels at any given time. They are designed to reduce wear and tear on the engine and transmission, while still providing adequate power to get the car moving quickly. Additionally, they can help extend the life of your car by reducing strain on its components.

When purchasing a soft limiter, you should consider whether or not it is compatible with your vehicle’s make and model. You should also find out if there are any special tools or modifications required for installation. Some soft limiters require additional wiring or programming in order to work properly.

It is important to note that most soft limiters do not come with an instruction manual, so it is important to find someone who has experience installing them in order to ensure proper installation. Additionally, you should always consult a professional mechanic before attempting any type of modification on your car.

In addition to the cost of the part itself, there may be additional costs associated with installing a soft limiter in your car. These include labor costs for installation and any necessary modifications that need to be made to ensure compatibility with your vehicle’s make and model.

Soft limiters can provide many benefits including improved acceleration and fuel economy as well as extended engine life. However, it is important to consider all factors before making a decision about whether or not you should install one in your car. Be sure to research all aspects thoroughly before making this decision so you can be sure you’re getting the best value for your money.

Safety Considerations When Installing a Soft Limiter in Your Car

Installing a soft limiter in your car can be an effective way to reduce the risk of accidents in your vehicle. However, it is important to take proper safety considerations when doing so. Here are some important safety tips to keep in mind when installing a soft limiter:

  • Check the Manufacturer’s Guidelines: Before installing the soft limiter, make sure you read and understand the manufacturer’s instructions and guidelines. This will help ensure that the installation process goes as smoothly as possible.
  • Use Professional Installation Services: If you are not comfortable performing the installation yourself, it is best to use professional installation services. This will help ensure that everything is installed correctly and safely.
  • Check for Proper Operation: After installing the soft limiter, check that it is working properly by testing it on a closed road or track. Make sure that all of the components are functioning correctly before using them on public roads.
  • Regularly Monitor Performance: It is important to monitor the performance of your soft limiter regularly to ensure that it is still working properly. Additionally, inspect all of its components for any signs of wear or damage.

It is also important to ensure that your vehicle has adequate braking power before installing a soft limiter. Make sure that all of your brakes are in good condition and up-to-date with their maintenance schedule. Additionally, perform regular maintenance checks on your suspension system and steering components to ensure they are operating properly.

Lastly, make sure that all other safety features such as seatbelts and airbags are working properly before driving with a soft limiter installed. This will help you stay safe on the road and minimize the risk of accidents or injury.

Types of Soft Limiters

When it comes to choosing the right soft limiter for your vehicle, there are a few different types to consider. The most common type is the mechanical soft limiter, which is a device that attaches to the accelerator pedal and limits the amount of acceleration that can be achieved. This type of limiter is often used in racing and can be adjusted to provide a certain level of performance. Another type of soft limiter is the electronic type, which uses sensors and computer software to regulate engine speed and power output. Finally, there are also hybrid soft limiters that combine both mechanical and electronic components for added control over engine performance.

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The installation process for a soft limiter will vary based on the type you choose. Mechanical limiters are typically quite easy to install and can be done by most people with basic mechanical knowledge. Electronic limiters may require professional installation, as they involve more complex wiring and programming. Hybrid limiters can also require professional installation due to their combination of components.

Safety Features

When selecting a soft limiter for your vehicle, it’s important to consider safety features as well. Most mechanical limiters have built-in safety features such as an emergency override system that allows you to override the limiter if needed. Electronic limiters usually have more advanced safety features such as temperature monitoring and shut-off systems in case of overheating or other issues. Hybrid limiters typically offer all the safety features of both mechanical and electronic types.


Price is another important factor when choosing a soft limiter for your vehicle. Mechanical limiters tend to be cheaper than electronic or hybrid limiters due to their simpler design and fewer components. Electronic limiters generally cost more than mechanical ones due to their complexity, while hybrid limiters may cost even more depending on how many components they include.


The adjustability of a soft limiter is also something you should consider when making your selection. Mechanical limiters usually offer adjustable acceleration settings so you can customize your performance according to your needs. Electronic and hybrid limiters usually have adjustable settings as well, allowing you to fine tune engine performance for maximum efficiency.


A soft limiter on a car is an important safety feature, and can be beneficial for both novice and experienced drivers. It allows the driver to have more control over the vehicle, and helps prevent dangerous situations from occurring. Soft limiters are becoming increasingly popular in modern cars, as they provide a greater degree of protection from potentially hazardous scenarios.

In addition to providing enhanced safety features, soft limiters can also help improve the overall performance of vehicles, as well as their fuel economy. It is important to understand how a soft limiter works so that you can make an informed decision about whether or not it is right for your vehicle.

Overall, a soft limiter is an important safety feature that should be considered when purchasing a vehicle. It can provide added protection in potentially hazardous situations and can also improve the performance of your car. With the right knowledge and understanding, you can make an informed decision about whether or not this feature is right for you and your vehicle.

It is important to note that while soft limiters are becoming increasingly popular in modern vehicles, they are not available on all models. Therefore, it is essential to check with the manufacturer before making any purchase decisions. This will ensure that you get the best possible product for your needs and budget.

About the author

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William Getty lives and breathes cars. He started driving cars as a 12 year old on the racetrack with his dad. Since then cars has always been a big part of Williams life.

In his garage you can find his beloved 2005 Ford Mustang, as well as a 2020 Audi A3.