Standard Exhaust Modified

[jack.pe]

Ok, now I hope you don't take too much offence to this, but having owned many other twins in the past I found the engine on my 1150 Gs to be a bit of a disappointment, I love the rest of the bike, but in terms of sound, smoothness, torque and power I was not too impressed.... the power is not such an issue but sound definitely was as I believe this is what gives twins their unique charachter..
I tried Remus pipes but they sounded awful, so I decided to modify the standard pIpe, found a link on the net for apartial mod which involved cutting one of the interior pipes but it still sounded crap, so I completely removed the internals inserted a perforated two inch pipe and made a standard straight through race pipe, the bike now sounds miles better, nice and bassy, is lighter and looks standard!!!! but I am am concearned if such a radical mod(plus the Y piece) has leaned the bike off too much?? I know the ECU adjusts to a degree, but will it be able to adjust enough for this??
The airbox is standard but i am to improve the inflow with a K&N and by modifying the snorkel... would the ECU cope with that AND my new pipe?

 

[StooL]

The truth is, nobody knows. Some bikes seem to be ok, some aint.......namely mine! Get it dyno'd after your done tinkering, for a bit of piece of mind.

Do a bit of reading in the technical section for some more info.

 

[petefeet]

hmmm - its all about flow

and from what i noticed being up close on saturday was that the flow hadn't significantly improved - although the sound has...

see if you can't get it done by august eh?
cheers
pete

 

[cuznbob]

exhaust mods

This really intrigues me, because I've built my own Y-pipe with an O2 bung for $20 american. Your and my experiments sound similar. Now my next step will be to modify stock muffler. I also have K&N filter. My bike pop's a little on deceleration since installing my Y. I believe the ECU can adapt if you still use your O2 sensor. I don't believe in the aftermarket chips-crap. That's about my story so far.

 

[Panzer Patrol]

Cuznbob,
Have a close look at the Remus Y-piece. You will notice that where it joins the front pipe the diameter after the curve is reduced making it a smaller diameter than the front pipes. Back-pressure is an important part of the GS exhaust system. These "reducers" help this back pressure effect. The length may also be an issue. If your Y-piece is a home-made one and is too far away from the dimensions of the Remus, you may not have the optimum for a good performance gain.
I know, I had a Y-piece made which actually increased the diameter of the pipe. I was working on the larger diameter = more flow. It actually worked against me. The bike ran well, but it ran a hell of a lot better when I fitted a Remus.
Just a thought

 

[cuznbob]

Yes, of course I noticed the different diameter and built mine that way, it's nearly identical to a Remus. Notice on the Remus and Sebrings there are differences in the 2into1 joint. The Sebring's is more of a true merge collector design. Sorry I don't have a pic of mine yet but it's definately uglier than either the Remus or Sebring. It's not stainless and not coated yet, just painted.