How to Choose a Bov Spring

8 mins read

Last Updated on September 16, 2022

If you’ve ever wondered how to choose a new Bov spring for your car, you’ve come to the right place. The basic principles of bov springs are simple, but understanding the differences between the different types can help you select the best one. These springs are also known as High rate springs, Adjustable springs, Diaphragm, or Valving. The next time you need to replace your Bov, be sure to keep these simple tips in mind.

High rate spring

Spring rate is the amount of force required to compress the spring a certain distance. It is measured in metric kilograms per millimetre or standard pounds per inch. A 500lb spring will compress one mm if a ten kilogram weight is applied to it. Conversely, a nine kilogram spring will compress 0.5 mm if a ten kilogram weight is applied to it. These two measures are often used to compare spring rates.

The angle of the spring is important when calculating the required rate. It must be within a certain window in the wheel travel. In other words, the spring should have a 60-40 compression ratio for street driving. Generally, a five inch spring is used for street driving. When customizing a vehicle, it is important to measure the corner weight and determine the proper spring rate. This will determine the height of the ride, and a higher rate spring will give your vehicle a lowered ride.

The second way is to graph the rate of the spring. A spring with large variation is a progressive one. Using a spreadsheet, you can plot the spring’s rate at various points in the displacement range. This is more accurate than an equation. It is best to use the graph instead of the equation. You will get a better idea of how much spring force you need by plotting the rates on graphs. If you want to make sure that your spring is high-rate enough for your application, it’s recommended that you check out the physics behind the rates.

A dual rate spring system has two different springs with different compression rates. A dual spring system will produce the softest ride quality and is most flexible, but will cost more than a single spring. However, this type of spring is a lot cheaper than a dual spring system. The accountants who developed it have done a thorough job of calculating the cost of a dual spring system. If you’re looking for a dual rate spring kit, check out the specifications.

Adjustable spring

Selecting the right spring for your BOV can be difficult. Selecting the right spring for your car should not be based on boost level, but instead on how the BOV closes under vacuum conditions. Selecting a spring with less energy will allow the BOV to close with minimal force and snap open easily under high boost. Here are some tips to help you choose the right spring for your vehicle. It may surprise you! Weigh the spring before modifying your car’s performance.

First, look at the preload of the spring on your BOV. If your car is fluttering or backfiring excessively, there is a problem with the connection to the BOV. The spring should be adjusted to reduce or eliminate flutter. Excessive backfiring or stalling can indicate improper connections or increased spring tension. In some cases, a heavy-duty spring may be required.


The diaphragm of the BOV spring acts as a seal that keeps the valve closed during vacuum operation. The pressure applied to the spring keeps the diaphragm closed. Without a check valve, the spring is unable to keep the valve closed. If the valve is not kept closed, the spring may be too tight, or there may be a hole in the diaphragm.

GReddy Type-R: This blow off valve is the ultimate in blow off valve performance. The valve has two springs: a stiff one for extreme power figures, and a standard one for street use. Greddy is a JDM tuning legend, and their Type-R is the most powerful blow off valve available. In case you’re on a budget, the TurboSmart Vee Port Pro Blow Off Valve might be a good option.

OEM and SSQV: SSQV models work on differential pressure, while OEM valves work on pressure versus spring principles. While the OEM valve gives a better response time, the diaphragm in a SSQV operates on the same principle. The difference is the diaphragm size and the mass of the piston. These three main components of a blow off valve determine its performance.

In a vacuum valve, the pressure on the top of the diaphragm pushes the valve closed, while the air hitting the face of the valve works against it. These differences are attributed to the design of the diaphragm and the way it functions. Depending on the configuration of the diaphragm, the valve can be configured to close or open, sequentially or synchronically.


When choosing a bov spring valve, you need to make sure you select the right one for your needs. There are several factors that determine which type of spring will work best for you. First, you must determine how much vacuum you need in your system. If you need to open and close the valve more often, you will need a higher-stiffness spring. A lower-stiffness spring will work fine in a journal bearing turbo and vice versa.

Next, you should look at the size and type of springs. The springs control the pre-load and spring rate, as well as the piston mass. These are important considerations, but consumers often do not have access to these details. Another factor to consider when choosing a valve is the port size, length, and signal line from the manifold, which moves the diaphragm. Many blow off valves are adjustable, and some can be set for different pressure levels, allowing you to find the perfect fit for your application.

About The Author

Wendy Lee is a pop culture ninja who knows all the latest trends and gossip. She's also an animal lover, and will be friends with any creature that crosses her path. Wendy is an expert writer and can tackle any subject with ease. But most of all, she loves to travel - and she's not afraid to evangelize about it to anyone who'll listen! Wendy enjoys all kinds of Asian food and cultures, and she considers herself a bit of a ninja when it comes to eating spicy foods.