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+--- Thread: Interactive exhaust valve (/showthread.php?tid=5791)
Interactive exhaust valve - VTR1000F_imp - 04-25-2014
What is it? I read in some CB1100 review that stock silencer is equipped with such valve. What is its purpose and how does it work? Education time for me! Thank you!
RE: Interactive exhaust valve - Lord Popgun - 04-25-2014
We don't have it in the US. I can't remember what its for though.
RE: Interactive exhaust valve - the Ferret - 04-25-2014
if it's like the one n my FZ it is for emissions and gives more torque at lower rpms
RE: Interactive exhaust valve - The Spaceman_imp - 04-25-2014
It's a valve that opens and closes depending on throttle opening. The idea is to increase back-pressure at lesser throttle settings and decrease it at higher settings. Generally speaking, it'll give you better performance at both settings. And by happy coincidence it keeps the bike quieter when you're putting along, and gives you more sound when you whack the throttle.
Yamaha calls it EXUP, and Suzuki has just added it to the new VStrom 1000 ABS; they call it "SET" which stands for "Suzuki Exhaust Tuning." The CB 1100 does not have the feature.
RE: Interactive exhaust valve - Deanohh_imp - 04-25-2014
I think in some markets it has one.
RE: Interactive exhaust valve - The Spaceman_imp - 04-25-2014
(04-25-2014, 07:23 AM)Deanohh_imp Wrote: I think in some markets it has one.
I'd be quite surprised, but I don't know for sure one way or the other. I do know the bike would have to have a completely different FI and exhaust setup to accommodate it.
RE: Interactive exhaust valve - Randy B - 04-25-2014
Here is a pic of it.
RE: Interactive exhaust valve - wildezt_imp - 04-25-2014
its that flippy flappy thing that opens and closes controlling the exhaust aperture..to alter the velocity of the exhaust emissions and back pressure...is what i heard.
RE: Interactive exhaust valve - Tyke57nz_imp - 04-25-2014
(04-25-2014, 07:23 AM)Deanohh_imp Wrote: I think in some markets it has one.
My machine has this fitted, a while back I took the end cover off the silencer to investigate and it is operated by cable from a servo positioned by the collector box. Not sure what will happen if an aftermarket silencer were fitted, guess you leave the servo operational without the cable. Might check with Staintune on that, as one of their silencers is on my wish list. Can take pictures if required.
RE: Interactive exhaust valve - the Ferret - 04-25-2014
(04-25-2014, 08:59 PM)Tyke57nz_imp Wrote:(04-25-2014, 07:23 AM)Deanohh_imp Wrote: I think in some markets it has one.
My machine has this fitted, a while back I took the end cover off the silencer to investigate and it is operated by cable from a servo positioned by the collector box. Not sure what will happen if an aftermarket silencer were fitted, guess you leave the servo operational without the cable. Might check with Staintune on that, as one of their silencers is on my wish list. Can take pictures if required.
Not required but pics would be appreciated so we can all see where it is and what it looks like on the CB. I don't see anything in the pic Randy posted.