Deceleration Popping... Is that normal?
Decel popping...some like it, others don't.
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
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 occur with the stock map and free flowing pipes being the only change.
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.
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 get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
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 occur with the stock map and free flowing pipes being the only change.
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.
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 get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
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Road Captain
Joined: Jun 2011
Posts: 594
Likes: 10
From: Seminole County, FL
I have experienced this to varying degrees on my 07 FLHR, with stage 1 mods. One thing that made the biggest difference was changing the TPS when I was having idle issues as well.
The TPS can make mixture really squirrely when it starts to go, mine popped so hard that it nearly broke the Y in half.
TPS is about $55.00, if you start having hi or no idle especially after highway rides it would be something to think about.
I wish I changed mine a couple of years ago, live and learn
The TPS can make mixture really squirrely when it starts to go, mine popped so hard that it nearly broke the Y in half.
TPS is about $55.00, if you start having hi or no idle especially after highway rides it would be something to think about.
I wish I changed mine a couple of years ago, live and learn
Road Captain
Joined: Jul 2007
Posts: 501
Likes: 0
From: Galveston Bay Area, The Republic of Texas
I have that condition on my 07 Ultra and V&H True Duals and Oval Muffs. Runs a V&H FuelPak. Contacted tech department at V&H. I have the canned map for those pipes. Over time the Decel Pop was more pronounced. After validating I do not have a exhaust leaking in air, we remapped one value and the decal pop went away. Slight change to the VE table to add a small amount of fuel.
Cruiser
Joined: Sep 2012
Posts: 131
Likes: 12
From: Ottawa, Canada
Decel popping...some like it, others don't.
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
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 occur with the stock map and free flowing pipes being the only change.
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.
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 get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
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 occur with the stock map and free flowing pipes being the only change.
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.
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 get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
Ahhhh! A voice of reason in a long string of confusion. Thanks!!!
Road Captain
Joined: Jan 2006
Posts: 601
Likes: 5
From: Pinellas County, Florida
I have that condition on my 07 Ultra and V&H True Duals and Oval Muffs. Runs a V&H FuelPak. Contacted tech department at V&H. I have the canned map for those pipes. Over time the Decel Pop was more pronounced. After validating I do not have a exhaust leaking in air, we remapped one value and the decal pop went away. Slight change to the VE table to add a small amount of fuel.
I had the same thing with the fuelpak, I believe it is #16 that number is the rpm that the injectors open up so it will idle, mine is set at 13 which means at 1300 rpm if I'm decelerating with the throttle closed no gas is getting in. If I give it a little throttle during decel I can make it pop.
Outstanding HDF Member
Joined: May 2008
Posts: 2,543
Likes: 19
From: Ashland Ohio
Decel popping...some like it, others don't.
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
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 occur with the stock map and free flowing pipes being the only change.
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.
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 get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
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 occur with the stock map and free flowing pipes being the only change.
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.
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 get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
Last edited by wurk_truk; Mar 27, 2014 at 04:28 PM.
Thread Starter
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Road Warrior
Joined: May 2012
Posts: 1,388
Likes: 132
From: Baltimore, MD
So let's say you wanted to learn how to reprogram your system. Where would you go to learn that? Specifically, the SE race tuner. (Should I start a new thread? Lol) And how do I know what to load?
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Road Captain
Joined: Jul 2007
Posts: 501
Likes: 0
From: Galveston Bay Area, The Republic of Texas
I had the same thing with the fuelpak, I believe it is #16 that number is the rpm that the injectors open up so it will idle, mine is set at 13 which means at 1300 rpm if I'm decelerating with the throttle closed no gas is getting in. If I give it a little throttle during decel I can make it pop.
I lowered mine from 16 to 14 and that solved this issue. So I appreciate the reply since now I know that is for the rpm settings for the injectors and not an actual VE table change.
Pirate