Fred
M em b er e d
There's multiple components to the system.
There's the reeds, which are one way valves, and are necessary because the pressure in the exhaust system varies in pulses.
Then there's the main valve, which is computer controlled. This is a simple on/off valve.
So, if the computer has turned the main valve on, then the reeds come into play and will allow the low pressure pulses in the exhaust to suck fresh air into the exhaust system.
The main valve is only on when the throttles are closed, or when the bike is still warming up. I should not have said "idle" as that is confusing to some. During decel, the throttles are at idle position, even though the engine is at high revs.
I'll recap now and hope that there's no more confusion.
The AIS only operates when the bike is in one or more of the following conditions.
1. Warming up.
2. Idling.
3. Decelerating with a closed throttle.
Given that none of these are situations where you are trying to make power, the AIS is totally irrellevent to your dyno tuning.
The AIS is not linked to the cat, either. Many bikes have an AIS without a cat.
As for the popping of the exhaust, that's what AIS does. The sound is unburned fuel getting burned off in the pipe. The reason you can hear it with your aftermarket pipe is quite simple. You have an aftermarket pipe, and it doesn't muffle the bike as well as the stock pipe. So you're hearing the popping that was already happening.
On another tack, I really enjoy breathing. Can we please leave the emissions stuff in place so that the next generation can also experience the pleasure that we refer to as "air"?
Fred
There's the reeds, which are one way valves, and are necessary because the pressure in the exhaust system varies in pulses.
Then there's the main valve, which is computer controlled. This is a simple on/off valve.
So, if the computer has turned the main valve on, then the reeds come into play and will allow the low pressure pulses in the exhaust to suck fresh air into the exhaust system.
The main valve is only on when the throttles are closed, or when the bike is still warming up. I should not have said "idle" as that is confusing to some. During decel, the throttles are at idle position, even though the engine is at high revs.
I'll recap now and hope that there's no more confusion.
The AIS only operates when the bike is in one or more of the following conditions.
1. Warming up.
2. Idling.
3. Decelerating with a closed throttle.
Given that none of these are situations where you are trying to make power, the AIS is totally irrellevent to your dyno tuning.
The AIS is not linked to the cat, either. Many bikes have an AIS without a cat.
As for the popping of the exhaust, that's what AIS does. The sound is unburned fuel getting burned off in the pipe. The reason you can hear it with your aftermarket pipe is quite simple. You have an aftermarket pipe, and it doesn't muffle the bike as well as the stock pipe. So you're hearing the popping that was already happening.
On another tack, I really enjoy breathing. Can we please leave the emissions stuff in place so that the next generation can also experience the pleasure that we refer to as "air"?
Fred