man the aftermarket buys are gonna have a time......That is obviously the rest of the air volume required for backpressure and whatever . Also look where the exup valve is, way up by the end can...Even a slip-ono will reiminate the cat...

 

as the post before me says.... looks like a mix of exup housing and catalitic converter.... i'm sure the O2 sensor is mixed in with all that too.....

that's one messy looking exhaust system

 

Holy shit. That's gotta be some sort of resonator/cat. That doesn't look like it flows smooth.... :dunno

 

another guess is a mix of cat/exup/and the initial silencer...or no cat...there isnt much volume in that shorty can to silence the exhaust for street legal purposes...unless the can is extremely restrictive, which is unlikely...if both the units are highly restrictive, thats great for aftermarket tuners...

 

Titanium ‘midship’ silencer
One of the most original design features on the new R6 is its midship muffler, which is positioned at the centre of the machine in both lateral and longitudinal aspects.
The silencer is manufactured from titanium, and by positioning it beneath the bike at its midway point, we have been able to lower the centre of gravity. This mid-way location also helps to achieve an idealised front wheel weight distribution, and in visual terms the ‘midship’ silencer enhances the concentration of mass that characterises the whole look and feel of new R6

found that at yamaha-motor.co.uk

 

ahh they had a picture up of the new akrapovic system for the r6 yesterday on the yamaha-racingparts website but they took it down. The system didnt have that huge box in it.

 

ahh they had a picture up of the new akrapovic system for the r6 yesterday on the yamaha-racingparts website but they took it down. The system didnt have that huge box in it.

heres the pic u r talking about:

u cant actually see if its there :dunno



here's a stock bike with firing on

also the new gixxer also got it :fact

 

the suzuki's looks worse to me... just because the bodywork dosen't cover it

 

sssr1 thats not the picture. The picture had the akrapovic system for the R6 shown. It showed the whole kit, springs, pipes, headers, etc all apart.

 

the suzuki's looks worse to me... just because the bodywork dosen't cover it

If you werent looking for it on the gixxer you wouldnt even notice it was there. I kinda like how the gixxer has it. They incorporated it into their design instead of covering it up

 

man the aftermarket buys are gonna have a time......That is obviously the rest of the air volume required for backpressure and whatever . Also look where the exup valve is, way up by the end can...Even a slip-ono will reiminate the cat...

backpressure? are you 15 and heard that from your cool friends? :2bitchsla

 

could it be the Exup unit?



:dunno

 

backpressure? are you 15 and heard that from your cool friends? :2bitchsla

Are you 40 and like picking on people?

 

no, I'm 27, and you heard it from me.

Backpressure is made by the exup at lower rpm's to increase low-midrange power. his air mass is before the exup, so it's being pressurized.

If I'm wrong, then I'm wrong. But guess what? You don't offer any reason....

 

huh? I wasn't arguing what you said as being wrong or right I just meant you were being a jerk about it.

edit: I was talking about bottlerocket.

double edit: oh you weren't talking to me. my bad rdandy .

 

i think that must be part of the silencer , that pipe is too small....

 

all good excell

 

no, I'm 27, and you heard it from me.

Backpressure is made by the exup at lower rpm's to increase low-midrange power. his air mass is before the exup, so it's being pressurized.

If I'm wrong, then I'm wrong. But guess what? You don't offer any reason....

backpressure is no good. velocity is good. backpressure doesnt work for exhaust, and thats not what the exup valve controls. the exup valve allows the exhaust to cross over thereby changing the velocity of the exhaust. I dont know who coined the term "backpressure", but anyone who wants backpressure in their exhaust is crazy. here is a longer writeup on it:

The first misconception that needs to be cleared up is that a header relieves backpressure, but a certain amount of backpressure is needed for optimum performance. Just the opposite is true. A good header not only relieves the backpressure, but goes one step further and creates a vacuum in the system. When the next cylinder's exhaust valve opens, the vacuum in the system pulls the exhaust out of the cylinder. This is what the term "Scavenging" means.


Backpressure doesnt create power at any level. Yamaha wouldnt put that other can thing on there to create "backpressure"

class dismissed.

 

Are you 40 and like picking on people?

Good come back......:thumbup

Wait a minute, I'm 40 and like picking on people.....:rant Oh well....:beer

 

Are you 40 and like picking on people?

no, im 19 and know what im talking about

 

also the new gixxer also got it :fact

i noticed that too... means that 06' will be a very interesting battle in terms of the 600 class...

suzuki has always done well in terms of power to the wheel, so I think they will be very close between the R6 and and the GSXR600..

so if you're looking at a perrformance related comparison, i'd say how well yamaha's fly-by-wire turns out will be the main feature of the bike that will or won't make it a better bike...

only time will tell...

gonna have to just buy both... oh well haha

 

akrapovic cuts that out for their evolution systems. here's a picture that i was talking about.

 

the new R6 get's the EXUP



& the Trump 675 will be using an EXUP type set up

 

backpressure is no good. velocity is good. backpressure doesnt work for exhaust, and thats not what the exup valve controls. the exup valve allows the exhaust to cross over thereby changing the velocity of the exhaust. I dont know who coined the term "backpressure", but anyone who wants backpressure in their exhaust is crazy. here is a longer writeup on it:

The first misconception that needs to be cleared up is that a header relieves backpressure, but a certain amount of backpressure is needed for optimum performance. Just the opposite is true. A good header not only relieves the backpressure, but goes one step further and creates a vacuum in the system. When the next cylinder's exhaust valve opens, the vacuum in the system pulls the exhaust out of the cylinder. This is what the term "Scavenging" means.


Backpressure doesnt create power at any level. Yamaha wouldnt put that other can thing on there to create "backpressure"

class dismissed.

First off there is a huge difference between a factory exhaust system and an aftermarket exhaust system, factory systems are made conservatively, not to the extend of the performance aspect of an unrestrictive aftermarket system....so lets just get that right out there. Secondly, yes an exhaust system DOES need backpressure for the engine to create torque, and this is what the "exup" valve in factory motorcycle exhaust systems does, and if you have ever taken yours apart you would know that, and this whole thing of the exhaust "crossing over" you have no idea what you are talking about, the factory exup valve system in the 04-and up R1 is at the very end of the header in a cast collecting piece, where after the exhaust comes in contact with the exup valve, it then is collected into a single pipe....sorry no crossing over here....and then proceeds on to the y-pipe and into the cans. You are somewhat correct when you said it changes the velocity, it does change the velocity by slowing it down and creating torque in the motor. When you remove the restrictions in the exhaust system you lower the torque in the the low-end and some mid-range areas of the torque curve, however the less resriction creates a higher flowing exhaust, which in turn creates more top-end power where the motor is spinning anywhere from 11,000 rpms and up. And lastly you are halfway correct in saying backpressure doesnt create power at any level...when talking about horsepower, however it does create torque which can be deemed power, or as a means of putting the power to the ground.

And to the gentleman who said of them fitting the R6 exhaust with the oxygen sensor....bikes dont come with oxygen sensors, thats why we have to use a power commander everytime you change the intake and exhaust aspects of a motor. They do not have an oxygen sensor to do it on their own.

 

:iamwithst

I thought Honduh's had O2 sensors? I could be wrong..... Some back pressure is good, it keeps the fuel in the cylinders. Can you imagine how rich you would have to tune your bike if you had no back pressure? You'd probably have 10 foot flames shooting out the exhaust.