Well boost holds the valve shut under positive manifold pressure (up to 80psi). So if it is indeed related to your BOV installation, check the things I mentioned. Is the nipple in the top of the valve tight? If it was working fine on your buddies car, what changed?
In addition, if your boost...
If you are leaking boost - you have a leak!
IF the BOV is the source, either you reference or reference line has an issue or you are missing one of the sealing o-rings. No amount of adjusting will fix a leak.
I cannot count how many times we have had "issues" with the bov that ended up being...
There are many running them.
Key thing to note - the valve re-circulates ALL vented air until the valve goes past 50% lift (heavier loads). It then uncovers the VTA port but it does NOT close off the re-circ port. The flow capacity is doubled. Air is always re-circulating when the valve is...
They work properly.
Why would we make a product that doesn't? That would be silly.
Changing springs is an option to tune for personal preference and vehicle mods.
My guess is you have an aftermarket CAI and you are hearing things you never heard before.
Put the stock airbox back on and...
I run them on my Ecoboost Mustang and they have been fantastic!
Also recently installed a set on my GT500 and they are way better than the Tokiko D-Specs I have been running for the last few years.
3" from the turbo all the way back with no areas of restriction - https://www.rallysportdirect.com/part/turbo-back-exhausts/xfo-es-fm16-tbs-x-force-twin-3in-stainless-steel-turbo-back-system
The only situation where the ECU controlling the valve would truly be beneficial (from a performance standpoint) would be where the only strategy operating it is TPS based. And by the way, their TB control strategies are also awful. This car would be SOOO much better with a cable throttle - lol...
Waiting for dyno results ;-)
If the OEM's control strategies and methodologies were the best (from a performance standpoint), a whole industry would not exist.