The ELEVATE Volvo C30 Dual Port Turbo Compressor Bypass Valve (CBV) Blow Off Valve is a bit of engineering and manufacturing brilliance that will help keep your turbocharger functioning to its full potential--and let it be heard when desired. Manufactured for ELEVATE by long time development partner Turbosmart, our Dual Port CBV Blow Off Valve outperforms and outlasts any other unit on the market. Our robust piston design is fast acting and designed to perform.
Around town with light throttle/low boost driving will not sound much different than stock. The reason being is that the piston only cracks open a bit when the throttle is lifted, redirecting all of the boosted air back into the turbo, just as the stock CBV does. However, when you have the throttle down/high boost and snap the throttle closed, the piston in the CBV opens more, directing some air back into the turbo and the remainder being vented to atmosphere, achieving the "whoosh" / "pshhh" sound enthusiasts appreciate.
What is a Compressor Bypass Valve (CBV)?
When your turbocharger is generating boost and you release the accelerator (closing the throttle), the boosted air essentially hits a wall (the closed throttle). The pressurized air must be redirected back into the intake of the turbo to prevent turbocharger damage (at the worst) or turbo lag (at the least). A Compressor Bypass Valve is activated by the air pressure signal from the Inlet Manifold. The CBV stays closed under boost conditions (directing all boosted air to the engine) or snaps opens when vacuum is detected, redirecting boosted air. The factory turbo system utilizes a CBV integrated into the turbocharger compressor housing.
Do I need a new CBV?
The factory CBV is a diaphragm with spring design that can rip under higher boost pressure or simply fail from fatigue and heat, even on stock engines. If your CBV fails, the turbocharger cannot make the boost pressure it was designed to as boosted air is being fed right back into the turbo inlet, and power is lost. The easiest way to see if your CBV has failed is to connect a vacuum test pump to the nipple on the CBV and apply a bit of vacuum. If the unit holds vacuum, your CBV diaphragm is still in tact and should be functioning (this test does not work on piston style aftermarket CBV's). We have seen stock CBV's fail in less than 15,000 miles.
Those with a Performance Software Tune which increases boost pressure will benefit from our CBV with more consistent boost delivery and the long lasting durability that our design offers.
What makes the ELEVATE Dual Port CBV Blow Off Valve unique?
The short answer: Design, Engineering, Materials, Manufacturing and Adjustability.
Design: Starting with a clean sheet, our Dual Port CBV Blow Off Valve was designed to achieve the desired performance. Careful consideration was given to maximum flow capability in a compact enough package to be a direct replacement for the factory CBV. A simple and elegant design with function as the driving force.
Engineering: Development partners Turbosmart have been designing and manufacturing turbo management systems and components since 1997. Their commitment to a top quality, overachieving performance goes into every component. Years of research, development and testing in motorsports has yielded a knowledge base that translates into excellent function and engineering of our CBV. Our CBV requires no additional springs or adjustments due to our unique design. Other CBV's require an assortment of springs to compensate for different boost pressures due to pressure differential imbalance within the unit and the use of o-rings to seal the piston. A change in tune or set-up could require a different spring setting, requiring removal and reinstallation of a competitor's CBV.
Materials: Any design is only as good as the materials it is made out of. Our CBV body is made of precision machined and anodized 6061 aluminum. The piston is made of a unique bronze alloy that requires no o-rings to seal and yields smooth valve movement. Designs that utilize o-rings have proven time and again to be troublesome as o-rings stick, causing erratic valve movement and do not always allow the piston to return to the same location. Other problems of o-ring sealing of the piston include high friction, fatigue, lack of lubrication, heat generation, wear, varying affects of high temperature, chemical attack, and break-away friction.
Manufacturing: The ELEVATE Turbo Compressor Bypass Valve is manufactured using state-of-the-art techniques on the latest equipment. Tight, precision machining processes and the coating of specific components create the precision tolerances required for top performance.
The ELEVATE Dual Port Turbo Compressor Bypass Valve Blow Off Valve is a direct replacement for the factory CBV. The bracket which holds the Turbo Control Valve (TCV) is not able to be reinstalled, so the TCV will need to be relocated. Relocation of the TCV away from the turbo is a favorable idea anyway due to the heat's affect on the TCV.
Installation instructions are included along with mounting hardware, thread locking compound, ties, and premium quality black silicone vacuum hose to replace the factory rubber hose between the Inlet Manifold and ELEVATE Dual Port Turbo Compressor Bypass Valve Blow Off Valve.
Sounds Cool, Keeps Turbo Spooled Review by Daniel G
The install was easy until I was about 90% done, when it became very difficult / impossible for me to get the last bolt on. The Axel can get in the way of threading the final bolt to hold it in place. When all is said and done, this modification sounds pretty awesome when shifting through gears, and there is a slight performance gain where, between shifts, the turbo remains a bit more spooled. (Posted on 5/10/2017)