Migglesworth
New member
Ahoy! I was intent on installing the Arrow dark alum and mounting it shortie style on my FZ-07, and I approached a fuel controller and exhaust vendor about this. His reply was interesting and I haven't seen much on here or other forums with regards to the performance aspects of mounting the Arrow in this manner. Below is the mail from the gentleman I had been speaking with about ordering the fuel controller and exhaust from. I am stoked he took the time to find this info out, and before I make any decisions I wanted to put this to the masses. I was curious if anyone here has anything to add about this. Thanks for your time.
We had no idea people were doing this to their exhaust.
I shared this with our head tech and asked him what he thought.
From a performance stand point, this modification is not recommended.
The added length in the tube creates a good amount of volume and is key in building back pressure which results in torque.
This is why the Akra Carbon has the twist in their exhaust header.
Removing this tube will also increase the likelihood for reversion. Reversion is when fresh air is sucked up into the exhaust in between combustion pulses.
The added fresh air results in popping and backfiring. This may be a side effect that can’t be tuned out through fueling. The shorter the exhaust, the higher likelihood for reversion.
Drag pipes are notorious for this, but drag pipes are meant for drag racing at WOT, not for cruising around town throughout the entire rpm range.
Another thing to think about; European exhaust manufacturers are forced by law to produce an exhaust that improves power. They cannot sell anything that decreases power.
This length of tubing could be essential in creating that power. If you look at the exhaust pictures in that thread, that length of tube is pretty substantial and they increase tube diameter as well to increase volume.
By taking this tube out, you could be lowering performance even below stock. It will probably perform at high rpms, but it might ruin the nice torque curve the bike currently has.
On the flip side, some motor designs are not greatly affected by the exhaust. The shortie style mount may not significantly affect performance. We have not been able to test it so we don’t know for sure.
From an exhaust design standpoint, the shortie style mount goes against the fundamentals of an exhaust with good performance.
If you want the short look but don’t want to be moving backwards, I would recommend the Akra Carbon.
Also, the fuel controller settings that we recommend for the Arrow exhaust may not be the best settings if you choose to not install that length of pipe.
You may have to adjust the settings further to get the bike tuned properly.
I don’t mean to be a debbie downer and ruin your exhaust plans, but I want you to have a good performing bike and for you to feel like your investment in the exhaust was worth the gains.
We had no idea people were doing this to their exhaust.
I shared this with our head tech and asked him what he thought.
From a performance stand point, this modification is not recommended.
The added length in the tube creates a good amount of volume and is key in building back pressure which results in torque.
This is why the Akra Carbon has the twist in their exhaust header.
Removing this tube will also increase the likelihood for reversion. Reversion is when fresh air is sucked up into the exhaust in between combustion pulses.
The added fresh air results in popping and backfiring. This may be a side effect that can’t be tuned out through fueling. The shorter the exhaust, the higher likelihood for reversion.
Drag pipes are notorious for this, but drag pipes are meant for drag racing at WOT, not for cruising around town throughout the entire rpm range.
Another thing to think about; European exhaust manufacturers are forced by law to produce an exhaust that improves power. They cannot sell anything that decreases power.
This length of tubing could be essential in creating that power. If you look at the exhaust pictures in that thread, that length of tube is pretty substantial and they increase tube diameter as well to increase volume.
By taking this tube out, you could be lowering performance even below stock. It will probably perform at high rpms, but it might ruin the nice torque curve the bike currently has.
On the flip side, some motor designs are not greatly affected by the exhaust. The shortie style mount may not significantly affect performance. We have not been able to test it so we don’t know for sure.
From an exhaust design standpoint, the shortie style mount goes against the fundamentals of an exhaust with good performance.
If you want the short look but don’t want to be moving backwards, I would recommend the Akra Carbon.
Also, the fuel controller settings that we recommend for the Arrow exhaust may not be the best settings if you choose to not install that length of pipe.
You may have to adjust the settings further to get the bike tuned properly.
I don’t mean to be a debbie downer and ruin your exhaust plans, but I want you to have a good performing bike and for you to feel like your investment in the exhaust was worth the gains.
