Update on the bike

[the Ferret]

But there was no dyno machine there, no cooling fan. Isn't there usually a big machine sitting beside the bike that the rider watches?

[xNE0x_imp]

I am skeptical myself on the dyno video.

Motorcycles are setup with a factory tune, which is calibrated by what's already on a stock bike. Even in the old days, especially with the older honda's... If you modified anything, you found yourself messing with jetting, etc. You may and can get away with modifying your motorcycle without making any corrections, but it is not recommended unless you know what your doing. So, adding a slip on for 9hp gain on the CB1100 without running a modified tune of some sort, seems far fetched to me. You might gain a couple horsepower, but not that much.

[DGShannon_imp]

But there was no dyno machine there, no cooling fan. Isn't there usually a big machine sitting beside the bike that the rider watches?

Pause the video at the 8 second mark and you see two gray electric motors driving cage fans, one on each side of the bike. Also, above the rider's left shoulder, you can see wiring, and what appears to be the bottom of the monitor. Later, you can see the rear tire on the dyno wheel.

I am skeptical myself on the dyno video.

Motorcycles are setup with a factory tune, which is calibrated by what's already on a stock bike. Even in the old days, especially with the older honda's... If you modified anything, you found yourself messing with jetting, etc. You may and can get away with modifying your motorcycle without making any corrections, but it is not recommended unless you know what your doing. So, adding a slip on for 9hp gain on the CB1100 without running a modified tune of some sort, seems far fetched to me. You might gain a couple horsepower, but not that much.

The "old days" were before fuel injection. Within the limits of its map range, modern fuel injection can adjust itself. Dramatic changes will need a new map.

I am skeptical myself on the dyno video.

Motorcycles are setup with a factory tune, which is calibrated by what's already on a stock bike. Even in the old days, especially with the older honda's... If you modified anything, you found yourself messing with jetting, etc. You may and can get away with modifying your motorcycle without making any corrections, but it is not recommended unless you know what your doing. So, adding a slip on for 9hp gain on the CB1100 without running a modified tune of some sort, seems far fetched to me. You might gain a couple horsepower, but not that much.

Nowhere in the video does it say that they didn't modify the tune. If there is even the slightest truth to the video, we all know that they would have to remap the bike. I would imaging that the failure to mention that was a creative marketing oversight!

[kennyw]

But there was no dyno machine there, no cooling fan. Isn't there usually a big machine sitting beside the bike that the rider watches?

Pause the video at the 8 second mark and you see two gray electric motors driving cage fans, one on each side of the bike. Also, above the rider's left shoulder, you can see wiring, and what appears to be the bottom of the monitor. Later, you can see the rear tire on the dyno wheel.

I am skeptical myself on the dyno video.

Motorcycles are setup with a factory tune, which is calibrated by what's already on a stock bike. Even in the old days, especially with the older honda's... If you modified anything, you found yourself messing with jetting, etc. You may and can get away with modifying your motorcycle without making any corrections, but it is not recommended unless you know what your doing. So, adding a slip on for 9hp gain on the CB1100 without running a modified tune of some sort, seems far fetched to me. You might gain a couple horsepower, but not that much.

The "old days" were before fuel injection. Within the limits of its map range, modern fuel injection can adjust itself. Dramatic changes will need a new map.

I am skeptical myself on the dyno video.

Motorcycles are setup with a factory tune, which is calibrated by what's already on a stock bike. Even in the old days, especially with the older honda's... If you modified anything, you found yourself messing with jetting, etc. You may and can get away with modifying your motorcycle without making any corrections, but it is not recommended unless you know what your doing. So, adding a slip on for 9hp gain on the CB1100 without running a modified tune of some sort, seems far fetched to me. You might gain a couple horsepower, but not that much.

Nowhere in the video does it say that they didn't modify the tune. If there is even the slightest truth to the video, we all know that they would have to remap the bike. I would imaging that the failure to mention that was a creative marketing oversight!

And by creative, marketing means intentional.

[DGShannon_imp]

How is the performance of the 2 bro's exhaust? I've heard rumors it robs power.

Dyno Run: https://youtu.be/XV2N6bP33ck

Based upon the YouTube dyno run, it is one of the very few that actually adds meaningful power (9 HP & 5.5 Ft-Lbs). I just couldn't bring myself to disrupt the CBs vintage design with a modern exhaust can, much less carbon fiber. But, for those after that look, it is a winner.

Dyno Run: https://youtu.be/XV2N6bP33ck

Based upon the YouTube dyno run, it is one of the very few that actually adds meaningful power (9 HP & 5.5 Ft-Lbs). I just couldn't bring myself to disrupt the CBs vintage design with a modern exhaust can, much less carbon fiber. But, for those after that look, it is a winner.
There's no way just a slip on adds that much power. Yes, the manufacturer will quote that, but no person will ever see that on an honest dyno run.

Funny, all doubts on the Two Brothers exhaust claim, but no complaints about this little gem straight off the beloved [url=http://staintune.com.au/products/honda-cb-1100-f]Staintune exhaust site...

"Staintune has managed to capture this modern classic and produce a muffler that not only looks the part but more importantly sounds and performs as well.
With a 7Hp increase over standard the extra performance is noticeable right across the rev range."

[the Ferret]

Well for the record I don't believe that one either. I would expect up to 3 to 4 horses out of a bolt on muffler and 6 or 7 out of a full cat less system. Of course I could be wrong, but I would have to see before and after dyno charts. It has not been the experience of members on this board who have made changes and had them dyno'd.