How Much Horsepower Do TGV Deletes Add?

TGV delete, or Tumble Generator Valve delete, has become a popular modification amongst car enthusiasts looking to enhance their engine's performance. The TGV assembly, found in certain vehicles, includes a divider bar and butterfly valve that can restrict the airflow to the engine. By eliminating these components through a TGV delete, enthusiasts aim to optimize the air intake, allowing for a smoother and more efficient combustion process. While a TGV delete offers several benefits, including improved throttle response and reduced turbo lag, one of the most significant advantages is the potential increase in horsepower. This modification has been well-received in the automotive community, as it offers a relatively simple and affordable way to unlock extra performance from your engine. However, it’s important to note that the actual horsepower gain may vary depending on the specific vehicle, it’s setup, and other modifications. As with any modification, it’s recommended to consult with professionals and conduct thorough research before proceeding with a TGV delete or any other engine modification.

How Much Power Does TGV Delete Add?

The TGV delete kit is designed to remove the restrictive components in the intake system of a vehicle equipped with a Tumble Generator Valve (TGV). The purpose of the TGV is to improve low-end torque and reduce emissions at lower RPMs. However, this design comes at the cost of restricting airflow and power potential at higher RPMs.

In dyno testing, vehicles with the TGV delete kit have shown impressive gains of up to 23 wheel horsepower (whp) and nearly 21 wheel torque (wtq). These gains can make a significant difference in the overall performance and driving experience of the vehicle.

It’s important to note that the actual power gains may vary depending on other modifications made to the vehicle and it’s tuning. Additionally, the TGV delete kit is most effective on turbocharged or forced induction engines that rely heavily on efficient and unrestricted airflow.

By removing the restrictive TGVs and allowing for improved airflow, vehicles can experience significant gains in horsepower and torque. However, it’s recommended to consult with a knowledgeable tuner or mechanic to ensure proper installation and tuning for optimal results.

Watch this video on YouTube:

Removing the divider bar and butterfly valve inside the TGV assembly through a TGV delete enhances airflow to your engine, resulting in a notable horsepower gain of approximately 12 HP.

How Much HP Does TGV Delete Add?

A TGV delete is an aftermarket modification that entails the removal of the divider bar and butterfly valve within the TGV assembly, ultimately enhancing the airflow to your engine. What sets this modification apart is it’s ability to significantly uplift your engines performance. One of the significant advantages of a TGV delete is the horsepower gain it offers.

When the divider bar and butterfly valve are eliminated, it allows for smoother and more efficient air flow, which in turn results in improved combustion. This improved combustion process ultimately leads to more power being generated by your engine.

It’s worth noting that alongside the horsepower increase, you can also expect improved throttle response and overall engine response.

As with any modification, it’s essential to consider the potential impacts on your vehicles warranty and emissions compliance.

This modification typically yields a horsepower gain of 12 HP, though actual results will vary depending on the vehicle and other modifications. While considering a TGV delete, it’s crucial to weigh the potential impacts on your vehicles warranty and compliance with emissions regulations.

TGV Delete vs. Other Airflow Modifications: Which Is Better?

  • TGV delete
  • Other airflow modifications

Source: TGV deletes – IGOTA~STi

The TGV delete Subaru WRX modification aims to enhance airflow by removing the factory’s restrictive butterfly valves found in the intake runners. With the TGV delete kit in place, these valves are eliminated, allowing for increased and unrestricted intake air flow to each cylinder. This modification can improve performance and overall engine efficiency.

What Is a TGV Delete Subaru WRX?

A TGV delete Subaru WRX refers to a modification done to the vehicle, specifically to the intake system. The TGV delete kit is installed to remove the factorys butterfly valves, which are situated in the intake runners. These valves have a restrictive nature and can hinder the flow of intake air.

By eliminating the TGV, the intake air flow becomes unrestricted and allows for increased airflow to each cylinder. This can lead to improved engine efficiency and power output.

This allows the engine to receive a more consistent and smooth supply of air, which can contribute to better throttle response and overall drivability.

However, it’s important to note that modifications such as the TGV delete may have legal implications and can void the warranty on a vehicle. It’s always recommended to consult with experts or professionals in the field before proceeding with any modifications to ensure compliance with local regulations and to avoid any unwanted consequences.

This modification aims to improve overall engine performance by allowing for increased and unrestricted airflow to each cylinder, resulting in enhanced power, throttle response, and potential for higher boost levels. Nonetheless, it’s crucial to consider the legal and warranty implications before undertaking any modifications.

Alternatives to TGV Delete Modifications for Improving Intake Airflow in a Subaru WRX.

  • Install a high-flow air intake system
  • Replace the stock air filter with a performance air filter
  • Upgrade the intercooler to improve cooling efficiency
  • Opt for a larger diameter aftermarket downpipe
  • Invest in a turbo inlet hose for smoother airflow
  • Consider a professional tune to optimize the air-fuel mixture
  • Upgrade the blow-off valve for better boost control
  • Install a cat-back exhaust system for improved exhaust flow
  • Upgrade the stock turbocharger for higher airflow capacity
  • Consider a front-mount intercooler for enhanced cooling


In conclusion, the implementation of a TGV delete serves to enhance the airflow within the engine by eliminating the divider bar and butterfly valve found in the TGV assembly. This modification results in a considerable increase in horsepower, with a gain of 12 HP being observed.

Scroll to Top