Need information about a Blow Off Valve

Hi I own a Subaru Impreza Sti 2013 I bought it new in 2013 it has 100000km on it now I have a question: Can a blow off valve 50-50 blow a engine!…. ???
I've already spoke with my local Subaru and they have told my NO its impossible then I contact the close tunning shop and they told me the exact same thing now I am looking to find out more from an expert!
Thanks
Marc
My car has a manual transmission.
Experienced mechanics share their insights in answering this question :
Hi Marc,
First, it is important to understand what a blow off valve does and what it’s function is on a turbo charged motor. The only job a blow-off valve is supposed to perform is to relieve excess turbo pressure that results from shutting the throttle rapidly under boost conditions. It is necessary to release this pressure because it will try to find a way out of the system, and the only way is back out through the turbo. The pressure side of the valve is attached to the pipe between the turbo and the throttle, and a vacuum hose on the top of the valve is hooked up to the inlet manifold after the throttle body. A spring holds the valve shut. When you are on the throttle, the pressure in the turbo piping and the inlet manifold is equal. This creates pressure on each side of the valve that is equal, thereby canceling itself out, leaving the spring holding the valve shut. When you lift off the throttle, you have high pressure in the turbo piping, and a vacuum in the inlet manifold. The pressure on the bottom of the valve and the vacuum on the top combine to lift the valve open and release the pressure in the turbo piping, since it can no longer go into the engine. For this reason, it cannot damage your motor as the excess pressure simply gets released via the exhaust.

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A: Tuning is not required for BOV`s, so you will be just fine to bolt this right up!
While blow off valves are not required for all engines, they can be a worthwhile addition for engines that are subject to high levels of stress (such as turbocharged engines). By helping to regulate pressure, blow off valves can help extend the life of your engine and keep it running at its best.
Blow off valves come in various sizes, typically from 38-60mm, and you`re unlikely to need to go over 50mm unless you`re running an insane setup above 700 hp. In this case, we recommend opting for the larger diameter options.
“It`s fine to run a BOV without a tune, it`ll just run rich between shifts and could ruin the cats over time.”
A: Tuning is usually not necessary for a turbo inlet hose and it is recommended to compare boost and air/fuel ratio before and after installation to make sure there are no significant changes.
The simple answer is NO! A Turbosmart BOV or BPV are designed and engineered to improve the performance of your turbocharger system and NOT damage your engine.
Not all turbocharged engines are made for blowoff valves. They might need a bypass (aka diverter or recirculating) valve instead. They both accomplish the same task but there`s a big difference in how they do it. The type of engine management your car runs will come into play when choosing a valve.
Subaru OEM IHI VF48 Turbocharger.
The VF42 is a roller-bearing turbo and is similar in size to the VF22 turbo, but the twin-scroll exhaust housing yields faster spool-up and a superior top-end. This is the standard equipment turbocharger used on the MY07 USDM Subaru Impreza WRX STI.
For bypass valves, you obviously don`t need a tune for them unless you were tuned with a leaking one beforehand.
Our intake system utilizes a stock size MAF housing that doesn`t require any retuning. You can bolt this on and notice immediate performance gains!
For bypass valves, you obviously don`t need a tune for them unless you were tuned with a leaking one beforehand.
Will a Turbosmart Blow-Off or Bypass Valve (BOV/BPV) damage my engine? The simple answer is NO! A Turbosmart BOV or BPV are designed and engineered to improve the performance of your turbocharger system and NOT damage your engine.
No Tune Required Intake : r/WRX.

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ANSWER : Hi Marc,
First, it is important to understand what a blow off valve does and what it’s function is on a turbo charged motor. The only job a blow-off valve is supposed to perform is to relieve excess turbo pressure that results from shutting the throttle rapidly under boost conditions. It is necessary to release this pressure because it will try to find a way out of the system, and the only way is back out through the turbo. The pressure side of the valve is attached to the pipe between the turbo and the throttle, and a vacuum hose on the top of the valve is hooked up to the inlet manifold after the throttle body. A spring holds the valve shut. When you are on the throttle, the pressure in the turbo piping and the inlet manifold is equal. This creates pressure on each side of the valve that is equal, thereby canceling itself out, leaving the spring holding the valve shut. When you lift off the throttle, you have high pressure in the turbo piping, and a vacuum in the inlet manifold. The pressure on the bottom of the valve and the vacuum on the top combine to lift the valve open and release the pressure in the turbo piping, since it can no longer go into the engine. For this reason, it cannot damage your motor as the excess pressure simply gets released via the exhaust.

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