Loosening it (turning it left/out) will decompress the spring, lowering the spring energy. Tightening it (turning it right/in) will compress the spring, increasing the spring energy. The screw screws directly into this plate, compressing the spring. BOV's have a small metal plate on top of the spring. If you hear a different sound from adjusting this screw, it means you are getting compressor surge which could destroy your turbo.Īll this screw does is adjust the preload on your BOV spring. The secondary purpose is to prevent waves of high pressure from slamming into the compressor wheel on your turbo when your throttle plate slams shut, extending turbo longevity.īOV Myth #1: The adjustment screw on top of an aftermarket BOV adjusts the sound that the BOV makes. Please read this article in its entirety prior to installation of any aftermarket BOV your turbochargers life may depend on it!Īs you know, the purpose of a BOV is to make that cool "PSSSSHHHH" sound when you let off the accelerator. The goal of this article is to clear up some of the common myths about BOVs and explain how blow off valves really work and how to adjust them properly. The Blow Off Valve (BOV) is one of the most misunderstood products in the automotive aftermarket. Check out our new website, custom designed just for AN Fittings and Stainless Steel Lines!Īluminum Pipes, Stainless Steel Pipes, and Exhaust Parts - Categorized by size instead of shape.īlow Off Valves - Myths, Installation, and Quality
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