BOT_ROCKET
New member
Hey all. I've been looking into what BOV I want to use when I build my intake, and I keep coming up with new questions. I don't really like the thought of having the BOV open under normal driving conditions, so a sequential seems to be out. I like the Tial valve, but it seems like there is a very fine line when it comes to spring pressure. Too much and you get surge/slow operation, too little and it will stay open too often. It seems to me like it would work better if it weren't controlled strictly by vacuum.
Then it occurred to me that the Tial wastegate I got from Steelblu has ports to operate off both boost and vacuum.
So here is my question: can I run a line from the manifold to the top of the wastegate and a line from the charge pipe to the bottom of the wastegate? In theory that would allow for a lighter spring, say 3-5 psi, so the valve only opens when there is a 3-5 psi difference across the throttle. I imagine that would make for a very fast and reliable response, and should still hold whatever boost you throw at it.
The only thing I can think might be a problem is if it would cause any tuning discrepencies, ie: commanded tip/map.
I assume if I were right this would be a far more popular mod, so what am I missing?
Here's a pic to illustrate what I mean. I added the AJP overboost mod in the drawing, too.
Then it occurred to me that the Tial wastegate I got from Steelblu has ports to operate off both boost and vacuum.
So here is my question: can I run a line from the manifold to the top of the wastegate and a line from the charge pipe to the bottom of the wastegate? In theory that would allow for a lighter spring, say 3-5 psi, so the valve only opens when there is a 3-5 psi difference across the throttle. I imagine that would make for a very fast and reliable response, and should still hold whatever boost you throw at it.
The only thing I can think might be a problem is if it would cause any tuning discrepencies, ie: commanded tip/map.
I assume if I were right this would be a far more popular mod, so what am I missing?
Here's a pic to illustrate what I mean. I added the AJP overboost mod in the drawing, too.