CBV or BOV?
I decided it is time to add some sort of boost pressure relief system on my charge air system. The question is do I run a BOV or CBV?
The BOV would certainly be easier to install as I would only need to drill and weld into one pipe on the charge air system so at first I was leaning towards adding one of these.
However I decided to add a CBV onto my build as I am not very fond of the "woosh" sound from using a BOV.
So I scoured the forums looking for information about adding a CBV to a kjet system and I was able to find that it is doable.
So which BOV to choose from?
I found that a few guys are using the Saab Heavy Duty Turbo Bypass Valve - Mode Inc. 770609148 so I decided to go this route. I was able to find one at a good price ( > $100) and when it arrived I was very pleased with the appearance.
I decided to mount the CBV between the Hot side of the high pressure IC piping and the cast aluminium double elbow before the turbo.
Below is what I was able to come up with
I also took the opportunity to fix a broken 8 mm nipple and upgrade the CCV input duct on the elbow as well
I welded these connections to the piping
And finally the full installation
I bought a tee which allowed me to continue to run my Hobbs pressure switch and supply the CBV the necessary vacuum it would need during operation
I haven't really been able to put the car through its paces yet but I did notice faster spool up time on the turbo and slightly improved 1st gear acceleration.
Once the weather warms up and I switch my daily from my 245 to my 242 I am sure I will have more details to share.