Volvo do not sell the CBV springs and neither do they sell the CBV on there own, you'd need to buy a whole turbo!
Also, I don't believe the CBV springs shown on the Viva website are intended for use with a stock diaphragm. They are intended for use with cars running much higher boost than stock and alloy CBV.
The CBV is intended as an upgrade over the stock CBV with a rubber diagphragm as it is common that the diagphragm degrades over time, being rubber they can crack.
Therefore, if you just replace the CBV with an alloy type and your car is totally stock, then it's adviseable to use the green spring as this has the same rating as the stock spring.
If your car is heavily modded, tuned mapped and running higher than stock boost, then obviously, you'd need to switch to an aftermarket CBV with a stronger spring as you don't want that extra boost leeching away because the stock or green spring cannot hold the valve closed.
My car is mapped peak boost @ peak torque around 21psi and I run a yellow spring on a Forge CBV.
This is the valve with yellow spring spring that I have fitted to my car. As you can see, you'll save a fortune on import costs over the Viva version!
https://www.forgemotorsport.co.uk/Di...uct--1006.html
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