Rush Slip-ons installed...ehh
Tourer
Joined: Apr 2012
Posts: 262
Likes: 0
From: Goodyear, Az
I was running 2" baffles when I called Rush. They suggested a 1-3/4 better suited a stock bike. I got less popping (although not entirely gone), and a bit lower tone. Still sounded great, at idle.
Road Warrior
Joined: Jun 2010
Posts: 1,368
Likes: 27
From: Australia
Hi,
Good post Kevin, you know a guy put up a post in the general section I think where he had a dyno run with afr reading on a bike with slip ons, non-stock air cleaner, cam change and xieds
The afr only hit 14.6 at the start and trended between 13 to 14!! His tuner/dyno man advised him you running lean better get a tuner
I think this is the fear s.mullen talks about
Thanks
Mirrmu
Good post Kevin, you know a guy put up a post in the general section I think where he had a dyno run with afr reading on a bike with slip ons, non-stock air cleaner, cam change and xieds
The afr only hit 14.6 at the start and trended between 13 to 14!! His tuner/dyno man advised him you running lean better get a tuner
I think this is the fear s.mullen talks about
Thanks
Mirrmu
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
Most bikes with open air and exhaust and a performance tune will have decel pop.
Decel popping occurs when one of two things are present.
1. The bike is so lean the exhaust is superheated and is burning the unburnt fuel that is in the pipes (there is always some unburnt fuel in the pipes no matter how lean). This is very rare, and does not sound like it is what you are experiencing.
2. The AFR IN THE pipes is just right to burn the unburnt fuel. This is quite a common occurrence when free flowing pipes are installed (whether or not a free flow A/C is installed). It can also occur if there is an exhaust leak that is introducing extra air into the exhaust tract.
Check for leaks...if there are none, then move on.
To get rid of decel popping a lot of people put MORE fuel than is needed into the engine/over-richening the AFR so that more unburnt fuel goes into exhaust, changing the AFR in the exhaust so that is no longer optimum for combustion in the pipes. This is just a waste of gas. And if using decel enleanment found on most tuners it is still really hard to get rid of the popping/burbling when the injectors kick back in at about 1750 rpm.
Another way to change the AFR IN THE Pipes is to install Thunder Torque Inserts.
Not only will you get a deeper tone, you will get a nice bump in low and mid range power. They also change the AFR in the pipes and can reduce or eliminate decel pop.
Most bikes with open air and exhaust and a performance tune will have decel pop.
Decel popping occurs when one of two things are present.
1. The bike is so lean the exhaust is superheated and is burning the unburnt fuel that is in the pipes (there is always some unburnt fuel in the pipes no matter how lean). This is very rare, and does not sound like it is what you are experiencing.
2. The AFR IN THE pipes is just right to burn the unburnt fuel. This is quite a common occurrence when free flowing pipes are installed (whether or not a free flow A/C is installed). It can also occur if there is an exhaust leak that is introducing extra air into the exhaust tract.
Check for leaks...if there are none, then move on.
To get rid of decel popping a lot of people put MORE fuel than is needed into the engine/over-richening the AFR so that more unburnt fuel goes into exhaust, changing the AFR in the exhaust so that is no longer optimum for combustion in the pipes. This is just a waste of gas. And if using decel enleanment found on most tuners it is still really hard to get rid of the popping/burbling when the injectors kick back in at about 1750 rpm.
Another way to change the AFR IN THE Pipes is to install Thunder Torque Inserts.
Not only will you get a deeper tone, you will get a nice bump in low and mid range power. They also change the AFR in the pipes and can reduce or eliminate decel pop.
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stormcooker
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