What car engine has the most horsepower?

This blog post will answer the question, ‘What car engine has the most horsepower?’, and cover topics like what is a turbocharged engine, how do twin-turbo engines differ from turbocharged engines, and different twin-turbo engine layouts.

What car engine has the most horsepower?

The car engine that can generate the most amount of horsepower is the Koenigsegg Regera. It is made up of a 5.0-liter twin-turbocharged V8 engine that can clock up to 1500 HP. 

What is a turbocharged engine?

A turbocharged engine is made up of a component called a turbocharger. It comprises a rotating turbine and a compressor. The compressor retains the waste exhaust gases from the engine and recirculates it back towards the cylinders thus forcing more air and producing more power.


They are made up of a shaft formed by a turbine on one end and a compressor on the other. These parts are housed by a snail-shaped casing that has an inlet port protruding out of it. It is through this inlet port that the exhaust gases gain entry at high pressures.


After the exhaust gases enter the turbine, it starts rotating along with the compressor thus drawing in a large quantity of air and compressing it. These gases are recirculated via an outlet port and into a pipe that feeds them into the cylinders for further combustion with fuel.

An intercooler is deployed before the recirculated air can enter the cylinders to cool the compressed air. Turbochargers are oil-cooled to ensure they do not get excessively hot.

Some modern turbocharging systems have a component called wastegates. They help in diverting the excess exhaust gases away from the turbocharger in case the engine produces an excessive amount of boost. This prevents damaging the turbocharger.

Merits of turbochargers

These are the following merits of using turbocharged engines:

  • Power boost
  • Economical
  • Torque boost
  • Less noise

Demerits of turbochargers

These are the following demerits of using turbocharged engines:

  • Expensive installation
  • Complex design
  • Turbo lag

Difference between twin-turbo and turbocharged engine

Turbocharged engine

A turbocharged engine as was discussed earlier retains the exhaust gases emitted from the engine and compresses it and recirculates it back to the engine cylinders after passing it through an intercooler.

More air is pumped into the engine as a result. To maintain the air-fuel mixture ratio, more fuel needs to be pumped into the cylinders for optimal combustion. The fuel-injected burns faster than a normal engine, thus allowing a boost to engine power.

Twin-turbo engine

Twin turbochargers, as the name suggests are made up of two turbochargers that provide an extra boost of power by compressing even more air. 

It is either laid out in a sequence or in series formation and it works in such a way that the second turbocharger compresses the already compressed air by the first turbocharger.

Different twin-turbo engine layouts

These are the following ways in which twin-turbo engines can be laid out.

Parallel twin-turbo engine

The two turbochargers used are of the same size and are laid out parallel to each other. This configuration allows each of these turbochargers to compress half of the total exhaust gases retained.

The benefits of this type of layout lie in the fact that they reduce turbo lag, which is a condition where the vehicle does not produce enough exhaust gases to rotate the turbine inside the turbocharger. This setup uses two small turbochargers instead of a large one.

Sequential twin-turbo engines

This type of turbocharger arrangement includes a smaller turbocharger and a larger one for lower and higher speeds respectively.

A common problem that occurs in turbocharged cars is the loss of sufficient boost in power due to lower RPMs. Using the sequential twin-turbo layout, this problem can be solved as there is a turbocharger for both high and low RPMs.

Series twin-turbo engines

This type of turbocharger layout includes the two turbochargers laid out in a sequence or series formation. The compressed air from the first turbocharger is further compressed by the second turbocharger for an even larger boost in power.

Research shows the top 10 most powerful cars producing the most horsepower.


This blog post addressed the question, ‘What car engine has the most horsepower’.

We came to know about the most powerful car engine that can produce the most horsepower and studied a breakdown of a turbocharged engine along with its merits and demerits. Furthermore, the difference between a turbocharged and a twin-turbocharged engine has been discussed along with the different layouts for a twin-turbocharged engine. Please feel free to comment on the content or ask any questions in the comments section below.

Frequently Asked Questions (FAQs): What car engine has the most horsepower?

How many horsepower is a Tesla?

According to research, the Tesla Model S roughly clocks within 350-480 horsepower.

What car has the least horsepower?

To this date, the Mitsubishi Mirage has been found to be the least powerful car with a total horsepower of a mere 78hp on a 1.2-liter 3-cylinder engine.

Is V6 faster than V8?

V8-powered cars are capable of producing more power thus allowing the cars to accelerate much faster than a V6-powered car. The number of cylinders should be taken into account as V8 has more cylinders than a V6 does.