Best "Net Gain" CB11 Exhaust Option

[E11even_Hunnit]

Which one is it?

I've looked lots of places, including overseas website in other languages, trying to find THE one.

My findings are, that on this particular platform, there seems to be those who swear by either slip-ons, or full systems. The 2 top names that seem to consistently surface are Moriwaki(full) or Staintune(Slip-on)

Provided that there is a component of "engine/fuel management" involved, what's the word/thoughts on the street?

Who takes the cake for the exhaust with most gains? Sound note aside that is, since that is rather subjective

Stock vacuum lovers need not apply to this topic

Power gains are at question here, not the reminiscing chromed out beauty that came from the factory

[Bazbro_imp]

So... you're looking for 'performance', eh?

Why not just buy a performance 'bike? Then leave the CB as the beautifully-running 'retro' bike it is, with no pretensions of 'performance' (120mph not fast enough?), and enjoy the stock way that it runs. Reliability allied to a nice torquey motor - why ruin that?

I don't get why loads of you guys buy THIS 'bike and then just want "more power", totally ruining the WAY this CB delivers the type of power it does.

TORQUE... not power is the name of this game.

Each to his own, I suppose.

Mind you, the bland looks of the CB is crying out for "something" to be done to liven it up! Four exhausts would do that, a la CB750..

[Cormanus]

Plus, I'm not sure that anyone who has really approached this scientifically has got all that much of a power gain out of changing the exhaust. Powerdubs? Beardyweirdy?

[Houtman_imp]

I fully agree with Bazbro , a 4 into 4 makes it look like it should and also the sound is improved without making it too loud. You can also easily improve the ride with a seat suiting YOU and perhaps some suspension upgrades. However it is your bike and the owner can do what they want.

[E11even_Hunnit]

Been thru both an R6 as well as a crossplane R1 to know what "performance" is, but thanks for checking. Screw a 750 I got a 900F and if I wanted to build a bike from scratch I'd go 1123 kit on it or get a proper '83 11F as a slate and go from there. The goal here is to make more power on this bike, hence the thread is being posted here and not on another board. As I said, all those not on board need not apply, as I don't need discourage-rs or nay sayers, and I mean that with all due respect

Yes, I was actually hoping PowerDubs would chime in here since I know he's probably the most experienced in this topic on the CB, or at least on this forum.

Let the substance-filled discussion continue, or should I say commence?

[the Ferret]

Well since this forum started there have only been a handful that actually had dyno testing done after a pipe install. IIRC without other mods..intake, cat removal etc, most of the gains were in the +3 or +4 hp range, and weight loss was in the 5 or 6 pounds neighborhood. With a host of other mods, intake, cat removal, power commander or some such fuel delivery adjustment, they might see an 8 or 9 hp gain. With special ground cams I think Powerdubs saw about an 11 or 12 HP gain, again if memory serve me.I'm sure he will be along eventually to clear that up. Not all CB's start out exactly the same either. Some have reported 84 hp pre-mods and some 88 hp pre-mods, but I think Beirdy Weirdy and Powerdubs are the only ones that have crested the 100 hp plateau that I recall and that was just barely. On an otherwise stock CB 1100 with just a slip on I would expect a 3 HP gain and a loss of 4 pounds, with a full cat-less pipe maybe 6 hp gain and 8 or 10 pound loss.

Regardless of mfg claims no one is going to gain 10 hp and lose 20 pounds with an exhaust on the CB. At least no one has so far that I am aware of.

BTW if you type "dyno" in the search engine you can several posts from guys that dyno'd their bikes

[Ben70_imp]

I pretty much concur with the Ferret on this one. My 2013 came with a full Yoshimura exhaust thanks to the original owner. Out of curiosity I found a factory Yosh dyno compare, on their site I believe, showing a 5 hp gain at the top end with no other mods. The torque was about the same, as was hp til about 5k when it gradually gained to peak.
I really didn't care much about it either way as 98% or more of my riding is below 5k.
With a cam swap and Guhl flash, I improved peak hp, and more usefully for my purposes got a nice little torque bump at lower rpm.
Good Luck,

Ben

[E11even_Hunnit]

This is helpful. I should've stated that I'm not naively expecting to somehow get to 110HP with a single exhaust upgrade, nor do I realistically see that number as feasible, at least not without burning through thousand$ which I have no intent in spending. Primarily since I'm well aware of the engine's limitations at play here.

The objective here would be to get somewhere around the 100HP ballpark, or at least close to it. All while having an unobstructed and consistent powerband that will allow for the bike to go and feel faster, and be more enjoyable, for me. No, I don't intend on running it at a drag strip.

The mods involved to get there would include:
Air intake "snorkel" mod
PCV
Exhaust(Either a full Moriwaki system or the Staintune slip-on)

The latter being the one area I'd like some input from fellow power-seeking CB owners that have already played with this idea and explored their options to some extent

TIA

[PowerDubs_imp]

So... you're looking for 'performance', eh?

Why not just buy a performance 'bike? Then leave the CB as the beautifully-running 'retro' bike it is, with no pretensions of 'performance' (120mph not fast enough?), and enjoy the stock way that it runs. Reliability allied to a nice torquey motor - why ruin that?

I don't get why loads of you guys buy THIS 'bike and then just want "more power", totally ruining the WAY this CB delivers the type of power it does.

TORQUE... not power is the name of this game.

Each to his own, I suppose.

Mind you, the bland looks of the CB is crying out for "something" to be done to liven it up! Four exhausts would do that, a la CB750..

I find posts like this insulting, inflammatory, and most importantly- IGNORANT.


My bike makes more power, MORE TORQUE at every rpm, than stock.

It also rides smoother, more comfortable, and is awesomely cool to look at.

I wanted a classic UJM, I don’t want a sport bike. I also wanted more snot, and I’ve got it.

Your engine performance, and your attitude need improving.

I made - to the wheel - 100HP, 72.5TQ on stock ECU- so piggyback fueling, no IGN changes.

I have since added a Guhls ECU tune- need to get her back to the dyno and see what I’ve gained.


https://youtu.be/l-JUu8JBjGc





Sent from my iPhone using Tapatalk

[E11even_Hunnit]

So... you're looking for 'performance', eh?

Why not just buy a performance 'bike? Then leave the CB as the beautifully-running 'retro' bike it is, with no pretensions of 'performance' (120mph not fast enough?), and enjoy the stock way that it runs. Reliability allied to a nice torquey motor - why ruin that?

I don't get why loads of you guys buy THIS 'bike and then just want "more power", totally ruining the WAY this CB delivers the type of power it does.

TORQUE... not power is the name of this game.

Each to his own, I suppose.

Mind you, the bland looks of the CB is crying out for "something" to be done to liven it up! Four exhausts would do that, a la CB750..

I find posts like this insulting, inflammatory, and most importantly- IGNORANT.


My bike makes more power, MORE TORQUE at every rpm, than stock.

It also rides smoother, more comfortable, and is awesomely cool to look at.

I wanted a classic UJM, I don’t want a sport bike. I also wanted more snot, and I’ve got it.

Your engine performance, and your attitude need improving.

I made - to the wheel - 100HP, 72.5TQ on stock ECU- so piggyback fueling, no IGN changes.

I have since added a Guhls ECU tune- need to get her back to the dyno and see what I’ve gained.


https://youtu.be/l-JUu8JBjGc





Sent from my iPhone using Tapatalk

I find posts like this insulting, inflammatory, and most importantly- IGNORANT.


My bike makes more power, MORE TORQUE at every rpm, than stock.

It also rides smoother, more comfortable, and is awesomely cool to look at.

I wanted a classic UJM, I don’t want a sport bike. I also wanted more snot, and I’ve got it.

Your engine performance, and your attitude need improving.

I made - to the wheel - 100HP, 72.5TQ on stock ECU- so piggyback fueling, no IGN changes.

I have since added a Guhls ECU tune- need to get her back to the dyno and see what I’ve gained.


https://youtu.be/l-JUu8JBjGc





Sent from my iPhone using Tapatalk
The man himself has spoken. Thanks for chiming in, Josh

That last Dyno pull nearly got me in the mood

What exhaust are you running? I'm in a situation where basically I get to choose between either a Staintune slip-on or a Moriwaki 4-1 system(1 piece version, looks nearly identical to the Yoshi?)
Leaning towards the full Moriwaki for obvious reasons, unless you have reason to believe the Staintune with the stock headers should be the way to go, power-wise

Exhaust aside, I've been debating how or in what order I should approach the aforementioned complementary mods. Do you recommend I wire up the PCV prior to getting the ECU flash?

Also very much looking forward to seeing the results of your next Dyno run, whenever that may be