Besides breaking the law, is there any reason why I couldn't run without mufflers? I am thinking I could fabricate a set of straight pipes to connect to the stock header.
The only thing I can foresee is that the fuel mapping wouldn't be perfect. Is there a way to tune it with a dyno and make my own map?
Just an idea.
Matt
as far as straight pipes go, its possible. most of the aftermarket slip ons have no baffling in them anyway. The problem you run into is like you said, the fueling. on a simple scale, with any straight pipe/aftermarket pipe, you are essentially leaning out the motor. without a re-map to accomodate the new airflow, the bike will not run to its full potential. as of right now i havnt seen anyone such as power commander come out with a box to remap the shiver.
You wont be able to dyno tune it either since a dyno operator needs to write the new map on some kind of medium i.e a power comander or something to that effect. but give it some time im sure power commander will be on it soon.
First, it usually sounds terrible. The people that put the Boz exhaust on their ZX10's almost all took them back off. Second, our system is a closed loop system, requiring an O2 sensor. Of course you could put that into your pipe, but I'm not sure that it would work in a situation like that.Originally Posted by eeMattS
Just a few thoughts.
i dont have my bike here but im 99% sure the 02 sensor is before the cat. so it wouldnt matter anyway. sound quality is person to person also. its usually not the lack of baffling but the lack of tubing. if you hack your exhaust off where they meet under the bike, ya it will probably sound terrible, but if you hack it off then ran tubing all the way up to where the stock exhaust goes now, it probably wont sound too bad.
He had mentioned running it off the header, so I assumed no cat. Also, the last I heard, power commander hasn't produced anything to work with closed loop systems, because they can't interface, given the lack of the power commander to actually respond to the O2 sensor.
MV has been running closed loop for a while now, and as of last check there isn't anything (power commander, bazzaz, other) that works with it.
I do agree about the sound being personal, but I just haven't heard any open pipes that I liked (for more than the first or second rev).
Steve
I was thinking of just replacing the slip-on. Or gutting and plumbing the stock exhaust. I believe the o2 sensor is on the header.
Two interesting tests would be to dyno a shiver without a slip-on at all and with a small section of piping.
I recently found an interesting post about exhaust design.
http://www.hayabusa.org/forums/?act=ST;f=47;t=30981
Are there maps for any of the after market exhaust? I thought I read somewhere that people where getting new maps after installing slip-ons.
And if so, is that something the dealer can do?
Sike: if the 02 sensor is before the cat, the cat can be removed with no ill effects to the 02 sensor. i am pretty sure the sensor is before it. thus they can sell a cat eliminator pipe without any kind of map or chip.
interesting about the closed loop system. didnt know that power commander never did closed loop stuff.
doesnt aprilia sell a "Race chip" or soemthing for the milles or something?
Matt: as of right now i havnt seen any maps or chips or anything for this bike.
There are lots of different chips for Milles. I think at least one from Aprilia
Nothing for Shiver yet as far as I know. But it wouldn't need it, a new map will do the job. On the Mille a new chip is the only way to a new map.
No doubt someone somewhere will eventually start writing new maps. But this system is new and more complex than most.
Ex-owner: 2007 Shiver, Aprilia screen, Tuono forks and Brembos, Hyperpro Springs F&R, 46T rear sprocket (supersprox), DNA Filter, Akrapovics, Gold wheels, Michelin Pilot Road IIs
I would love to look at my bike to see where the O2/Cat are relative to each other, but that might be a few more days. I believe Aprilia's Race Chip is like Ducati's, where the system is built with it as a component that can be changed (I'm guessing like a storage chip). But, I don't know.
Steve
AF1 was nice enough to have a pretty good picture. It looks like the cat eliminator pipe has the mount for the O2 sensor.
http://www.af1racing.com/store/Scrip...idproduct=5526
Not that that helps to understand everything????
Steve
sure it does. good pic there. it helps us understand that the 02 sensor is examining exhaust gasses before it heads into the cat and mufflers. So if one decides to take off the cat and mufflers, the 02 sensor is still reading the same "pre cat, pre muffled" exhaust gasses. so put 2 and 2 together and we see that getting rid of the cat wont mess with any 02 sensor readings.
Matt if you wanted to just gut the muffler for better sound, id say go for it. it sure as hell would be chaeper then buying a set of leo slip ons. and since its all stainless, you can weld the baffles back in it if you dont like the sound.
i say go for it and take lots of pictures as you go along. remember measure twice cut once.
Burty, so most likely the shiver will need to get a chip in order to get a new map. if not, how do you get the new map into the bike without a fueling box such as a power commander?
It's a programmable system.
That's how Aprilia can download new maps. No need for chips.
A Power commander will just modify a number of different settings to fool the ECU into doing things it wouldn't do without the PCIII. Consequently it can make the ECU supply more fuel or whatever than it would otherwise.
Ex-owner: 2007 Shiver, Aprilia screen, Tuono forks and Brembos, Hyperpro Springs F&R, 46T rear sprocket (supersprox), DNA Filter, Akrapovics, Gold wheels, Michelin Pilot Road IIs
Current powercommanders don't work with closed loop systems. PCIII's are a set program (that can be changed via your laptop) without ability to respond (to the bike's computer, which is responding to the O2 sensor), which is necessary for a closed loop system.
Steve
Personally I find really loud bikes incredibly annoying and want to shoot the people who have them.
They just make the normals hate us more and thus more likely to run us off the road.
And that means all of us, not just the noise fans.
Makka the lurker
When the going gets weird
the weird turn pro
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