What a Boost Limiter Valve (BLV) is: A BLV is an adjustable spring-loaded valve that only opens to release boost pressure when an over-boost condition exists. It requires no wiring, operates independently of all other systems, and adds both safety and performance to the supercharger installation.
Adds Safety: Our new Boost Limiter Valve (BLV) increases your engine safety in several ways. With a BLV installed, you can set your max boost level to match the maximum fuel delivery you have and prevent a dangerous lean condition during those moments of high boost and load - which will damage an expensive engine in just seconds! Plus, it can protect you from a missed shift or over-revved motor that can spike boost pressures and blow inlet tubes or damage MAF and MAP sensors.
Adds Performance: Imagine your centrifugal supercharger comes in now at 3500 rpm and your red-line is 6500 rpm. That's 3000 rpm's of usable boost. But now, with a BLV installed, you could change your drive pulleys to bring the boost in at 2500 rpm and simply bleed-off the over-boost at the top end. Now you have 4000 rpm's of usable boost!
Description: Expertly machined from 6061 aluminum billet, with a type 302 stainless steel spring, and a high-temp solid PTFE valve ball. A high-quality piece that will last for many years. Operating temperature range is -328° to +500° F. Can be polished.
Soft-Open, Soft-Close: Our BLV will not shock your supercharger system with instant pressure drops like a waste-gate does. Instead, our BLV opens slowly and gradually, just as much as needed, and closes the same way - preventing shocking pressure fluctuations that crack aluminum fittings and make smooth fuel map tuning impossible.
Capacities: When fitted to a supercharger that produces 900 CFM on an engine with 9 psi of boost back-pressure, the compact BLV has enough flow to drop 1 - 3 psi on most systems depending on the supercharger. If you need to bleed off more pressure than that, use our larger Mega-BLV.
Dimensions: The Compact BLV will be 4.0" to 5.5" long (depending on how it is adjusted); and is 1.625" wide at the body. The ID of the weld-bung provided is 1.0" NPT.
Installation: Simply install in any tube between the supercharger and the MAF or MAP sensor. Usually installed near the BOV. One aluminum weld bung is included with your BLV at no charge.
To see all of our Replacement Superchargers Parts and Pulleys, Click Here
To see all of our Supercharger Rebuild Services, Click Here