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Blow-off Value vs. Bypass Value: The Difference

Blow-off Value vs. Bypass Value: The Difference

Today, many different vehicles have a turbocharger. However, with the turbocharger comes much information that isn’t known to the average individual. Specifically, information regarding the different between a Blow-off Value (BOV) and a Bypass Value (BPV). This would be beneficial to understand. For a glimpse at what separates the two terms, continue reading this article titled, “Blow-off Value vs. Bypass Value: The Difference.” Hopefully, we can provide you with all the information and details you need!

Before proceeding, you need to know what exactly the job of both the BOV and POV are. Basically, when you install a forced induction system, such as the turbocharger, into a vehicle there must be a way to release the pressurized air. If this doesn’t occur, the pressure can greatly increase, forcing the turbocharger in the wrong way. Truly, this can destroy your engine. Both the BOV and the POV allow for the pressurized air to escape, eliminating this problem.

Blow-off Value (BOV)

The BOV is a release point for pressure in a turbocharger engine. When the BOV does its intended job, it vents 100 percent of the pressure into the atmosphere. When this happens, a “pssssh” noise is made as all the pressure is immediately expelled from the turbocharger.

If you have a manual transmission, this might not be the way to go considering that every time you shift, the boost pressure must start at zero—resulting in all the BOV vents to continuously release the pressure every single time.

Bypass Value (BPV)

While the BPV has the same job as the BOV—to release pressurized air—it doesn’t vent any air into the atmosphere. Instead, the air is circulated back into the intake before the turbo, but after the flow sensor. This was designed to keep it more constant and to prevent tuning issues that often occur for the BOV. This specific option can have difficulty holding up to high horsepower applications. Taking this issue into consideration can force some individuals to choose the BOV option.

Your choice ultimately depends on your vehicle and what you’re using it for. Weighing your options after reading “Blow-off Value vs. Bypass Value: The Difference,” will hopefully help you identify what option is best for you. Just having a simple understanding of the different types of turbochargers available could beneficial in the future.

Here at TurboTurbo’s we have numerous pieces and parts available for purchase depending on what you need. We want to help make your vehicle everything you want it to be and more. For example, if you’re looking for a turbo actuator replacement or a brand new or used turbocharger, we have options for you! Simply call us or visit our website today to start your purchase.


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