synchronic BOV:
http://videos.streetfire.net/video/6...3f0150f005.htm

synchronic wastegate:
http://videos.streetfire.net/video/e...8600ccfc68.htm

Thoughts, opinions, facts, just looking for some intelligent discussion on these parts as the only other places I see info being posted it's just bickering back and forth about tial being better, then someone saying these are better, blah blah blah.

discuss...

 

Hmmm. Looks interesting. the only points I really like are the lessening of metal on metal parts, and the elimination of a diaphragm. seems to visibly react faster too. but wouldn't that also be a bad thing? couldn't some delay actually be better for blow-off in between shifts, so it is venting just enough pressure to prevent surge or overboosting, but allow for quick spool in the next gear?

 

The main difference is that it uses a cylinder instead of a diaphragm. The BOV should be able to react as fast as the throttle can close, if it doesn't then back pressure is built up stalling the turbo. If a shift takes .5 sec and the turbo flows "X" cfm of air in that time a faster actuation should be a more efficient at expelling that air. From the video it looks like it does this quite well.
The wastegate seems like its an even better application for the system. More adjustability and less heat in the actuation mechanism. That being said the amount of physical contact that the seals have to make worries me. It seems like that would cause alot of drag and slow the actuation. I guess simple testing would show what the results are. I also worry what happens when the seals start to wear out. The cylinder body determines valve seating. The wearing of the seal could also cause it to bind. What do they lube it with? How does it hold up to the heat? It's a pneumatic cylinder, cylinders do fail, even when they aren't attached to exhaust systems. Someone needs to run em for a good long time on a rotary engine, I think that would be a just about the harshest thorough testing you could do.

 

Oh, the one solid thing they were discussing is that the BOV test isn't really fair, the synchronic one is hooked up to a vacuum and pressure source where the HKS one is only hooked up to a vacuum source, they seemed to be leaning towards that giving the synchronic an advantage and that if the HKS was being tested similarly it would react quicker.

good points on the wastegate.

 

Damn, I was hoping for some good discussion on this . Or at least someone to pop in, say that it's hogwash (and why of course) and have that be the end of it .