How Much Horsepower Does A Throttle Body Spacer Add?

One of the hobbies of car owners is to customize and upgrade their vehicles. It is because it gives them a more satisfying experience while driving. 

So, how much horsepower does a throttle body spacer add? It is possible to increase your throttle body spacer up to 18 horsepower. 

The throttle body spacers can add up a performance that improves the fuel economy of your car. In addition, its power capacity will bring new life to your car. 

You must understand the tool well before adding a throttle body spacer to your car. The throttle body works by giving pressure to the carbureted engine of your car. 

As you push down the gas pedal, it creates a vacuum that releases the fuel mix with air. Therefore, the effect of the throttle spacer on the fuel-injected engine will depend on how hard you push your gas pedal. 

It means that the throttle body is crucial to function in your engine. So either you install it in a carbureted or fuel-injected engine. 

Also, the style of the throttle spacer that you can install will depend on the car model. Therefore, you should first consult a professional mechanic before you plan to add your horsepower by installing a throttle spacer.

How Much Horsepower Does A Throttle Body Spacer Add

How Much HP Does A Throttle Body Spacer Add?

Using a throttle body spacer can increase your car’s torque with 25ft-lbs that contains 18 horsepower levels. 

A throttle body spacer is installed on older engines. Specifically, those old engines that have fuel-injection systems. In fuel-Injection car systems work where the fuel goes directly on the throttle body going into the car’s combustion chamber. 

The same thing happens on a car with a carburetor system. However, if your vehicle has a multiple-port fuel injection system or a top-of-the-line system, changing its air vortex with a throttle spacer will not make any difference. 

To ask first a profession before you change something inside your engine, make sure that the engine can benefit from the changes. 

What Does A Spacer Do For A Throttle Body?

A throttle body spacer is a piece of metal that can change its airflow into the intake of your car manifold. 

It is bolted on the back of the throttle body, downstream to the primary care airflow. Its central enhancement capability is to increase an old engine’s fuel economy, torque, and horsepower. 

The flow of air in the manifold of the car engine maximizes the volume that goes into the intake. It works well on an old model car engine but not on the latest one. Also, a throttle spacer is a quick and inexpensive way to get your old engine to its maximum performance. 

Do You Need A Tune For Throttle Body Spacer?

You don’t need to tune up your car if installing a throttle body spacer since throttle spacers have a slight bearing on the car’s performance.

Is A Throttle Body Spacer Legal?

Yes, installing a throttle body spacer is legal because its primary purpose is to increase the car’s fuel economy, torque, and horsepower. 

It won’t also harm the engine. Instead, it will just enhance and push it to its maximum capacity. 

Is A Throttle Body Spacer Worth It?

Yes, it is worth it to install a body spacer. However, you don’t need to spend a lot because these tools are affordable. 

Even though it’s inexpensive, it works miracles on old engines. Unfortunately, however, you can’t install the latest model car engine because this system is for the older ones only.

The latest car engine is already on boost, and you don’t need to use a throttle body to increase the horsepower inside because it is already at the highest level. 

Moreover, only old cars can benefit from this tool because only their engine needs to be enhanced and supported by throttle body spacers. 

Related: Is Throttle Body Covered Under Warranty?


The throttle body spacer can guarantee a car to increase its horsepower up to 18th level. However, this tool only works for older cars.

If you have an old engine car and want to modify its horsepower, torque, and fuel economy, you can ask a professional mechanic to install a throttle body spacer inside.



Image credits – Canva

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My name is Hank, and I've been in the automotive industry for 27 years. I've been working in my own auto repair shop for the last 13 years, and now I want to help you here, on my blog. Let me know if you have any questions. Read more