I wonder if the active exhaust is like V-Boost intake on the V-Max

Post #391,434 by drook 7/3/14 2:09:59 PM Reply	I wonder if the active exhaust is like V-Boost intake on the V-Max http://en.wikipedia.org/wiki/Yamaha_V-Max_and_VMAX -- Drew
Post #391,436 by folkert 7/3/14 2:16:45 PM Reply	Wrong end of the motor. VBoost is supposed to do 10%... but in reality, not really. I'm a Yamaha Cruiser aficiando. The V-4 Motor and timing and carbs being tuned properly makes all the difference in the world... and the VBoost stuff REALLY only work on the stock tune anyway... most hard core VMax owners, tune the lean out of the system (EPA regulations)and get that 10% well before 5700RPM. Now the NEW 1670cc VMax V4 motor is a wonder of engineering. Yamah needs to put that baby into the Venture and Royal Stars... though detuned. The motor with large gas tanks... you could probably eek out ~44MPG easy, cruising and then... whoosh stomp on it and get like 20MPG. Yamaha never listens to its Buyers/Consumers of there bikes. Never happen. -- greg@gregfolkert.net "No snowflake in an avalanche ever feels responsible." --Stanislaw Jerzy Lec
Post #391,440 by drook 7/3/14 2:28:13 PM Reply	Other end, but could work the same I know 2-strokes are more sensitive to exhaust tuning, but as much work as people put in to creating equal-length headers there must be some effect. -- Drew
Post #391,447 by folkert 7/3/14 4:13:19 PM Reply	There is... But it is the Ram Air effect for the VBoost and the CV carbs the VMax uses. You don't get better scavenging from doing less back pressure, the net effect of scavenging is the same with or with out the back pressure. X tubes are the big thing now a days, Since the equal length exhaust manifolds/headers to collectors are effectively a done deal. -- greg@gregfolkert.net "No snowflake in an avalanche ever feels responsible." --Stanislaw Jerzy Lec
Post #391,452 by scoenye 7/3/14 7:45:10 PM Reply	No. Look's like Scott is the winner. http://www.autoevolution.com/news/2015-dodge-challenger-srt-hellcat-brutal-exhaust-sounds-video-81680.html After lots of sucking, squeezing and banging from all 8 cylinders, the supercharged 6.2-liter HEMI V8 sends gases through a low-restriction exhaust system. It's an active one of that, featuring butterfly valves that stay closed at low rpms to limit noise levels. However, if you step on the gas pedal more firmly, those valves open to reduce back pressure and the staccato exhaust note's volume is turned all the way up to 11. Altough, these days it is likely to be closer to Yamaha's driven EXUP valve rather than being vacuum operated.

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