Straightshot Slip-ons...now decel popping...
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Road Master
Joined: Apr 2009
Posts: 772
Likes: 101
From: Oxford MI
Straightshot Slip-ons...now decel popping...
I installed some Straightshot Slip-ons and man does it sound better. I do however get some decel popping and that doesn't sound so great. I have the standard baffles in and was wondering if the quiet baffles will help any as I plan on giving them a shot to get the deeper tone I hear they produce. I am running a stock AC and no after market fuel management. Would those be my next step? It also seems I lost some of the pull the bike had on acceleration at higher RPM's. Would the quiets or AC and fuel management help with that at all?
Any help would be great. Thanks for your time.
Any help would be great. Thanks for your time.
Road Captain
Joined: May 2007
Posts: 596
Likes: 7
From: Illinois
I've tried everything to get rid of the decel popping on mine, and am convinced it is just the nature of the crossover tube on the stock headers.
As for the pull on top end, get a TFI or DFO (same thing). If you plan on getting cams or headwork later, something like power commander, harley race tuner, or TTS tuner would be the way to go.
As for the pull on top end, get a TFI or DFO (same thing). If you plan on getting cams or headwork later, something like power commander, harley race tuner, or TTS tuner would be the way to go.
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,282
Likes: 1,139
From: southeast PA
The quiet baffles may help the popping since they are not straight-through and can give you more back pressure. It's possible that you had decel pop with the stock pipes but couldn't hear it. It seems that every bike is different and responds differently to mods. Your popping is most likely due to a lean condition which is how HD has to set them up to meet EPA standards. Going to a high flow AC means you will need fuel management to get it richer. It also means you will see a definite power gain.
Try the quiet baffles first and see what happens, then go from there if it persists.
Try the quiet baffles first and see what happens, then go from there if it persists.
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Road Master
Joined: Apr 2009
Posts: 772
Likes: 101
From: Oxford MI
thanks, i will start with the baffles...
ok great, thanks for the help fellas.
now...lol...why can't i get this new mustang wide solo to slide forward enough to let the eyelet on the back of the seat drop in to where it needs to so i can put the screw in...ggrrrrr
now...lol...why can't i get this new mustang wide solo to slide forward enough to let the eyelet on the back of the seat drop in to where it needs to so i can put the screw in...ggrrrrr
Road Warrior
Joined: May 2008
Posts: 1,774
Likes: 3
From: Chattanooga, TN
Greetings,
A cheap fix for the decel popping would be the Stage 1 download that can be done at the dealer. It's a canned map that doesn't do a whole lot, but in your case would probably work.
A cheap fix for the decel popping would be the Stage 1 download that can be done at the dealer. It's a canned map that doesn't do a whole lot, but in your case would probably work.
Road Warrior
Joined: Apr 2009
Posts: 1,360
Likes: 4
You may be lucky and one of the bandaids suggested here may work. The only sure way to tune decel pop out of even the most stubborn bike is with the TTS Mastertune tool or better. If you search here, there are dozens of stories just in the last six months of fellers trying everything, and failing. Decel pop is a fuel that did not burn completely in the cylinder mixing with air coming up the short pipes and lighting off. Could be too lean, too rich, or late timing.
Stage one download is a waste of $$ its not so cheap and does nothing for most pops, from what I've read here. A free flow intake may hurt more than help. A baffle will reduce the amount of air backing up, but the pipes are very short. An anti reversion cone may also help.
Again the only thing I found that will always get rid of the decel pop it is using the roughly $400 TTS tool or something better. The TTS allows you to find the sweet spot AFR and timing that burns all the fuel before leaving the cylinder, nothing left there to pop off. A side benefit of using the tool is that the tune you get is very good, better than many pro tuners, without the stress of a dyno tune.
The only way to get sound without losing torque is with a tuned 2-1 exhaust system like a thunderheader. Nothing wrong with wanting sound, but you should have expected that you give up some torque in the process. The bike's intake and exhaust from the factory is tuned for peak and reliable torque and messing with either will upset the bike's tune.
Stage one download is a waste of $$ its not so cheap and does nothing for most pops, from what I've read here. A free flow intake may hurt more than help. A baffle will reduce the amount of air backing up, but the pipes are very short. An anti reversion cone may also help.
Again the only thing I found that will always get rid of the decel pop it is using the roughly $400 TTS tool or something better. The TTS allows you to find the sweet spot AFR and timing that burns all the fuel before leaving the cylinder, nothing left there to pop off. A side benefit of using the tool is that the tune you get is very good, better than many pro tuners, without the stress of a dyno tune.
The only way to get sound without losing torque is with a tuned 2-1 exhaust system like a thunderheader. Nothing wrong with wanting sound, but you should have expected that you give up some torque in the process. The bike's intake and exhaust from the factory is tuned for peak and reliable torque and messing with either will upset the bike's tune.
Last edited by ColdCase; Nov 14, 2009 at 01:42 PM.
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Ultimate HDF Member
Joined: Apr 2008
Posts: 5,384
Likes: 12
From: Out on Deranged
At first I thought it was a bad thing , but now I kinda like that pop i get after winding a gear pretty high up and shifting!You will only get popping on zero throttle,so you can control it by keeping the throttle open just a bit,and as stated this is only due to un-burnt fuel in the pipes getting air and exploding which causes no damage. When I went to the quiet baffle the popping was almost completely gone,and I sorta miss it ! To spend extra money to get rid of it is a total waste of time, $, effort and worry.
@ donny i have no crossover tube and popping still happens
@ rack'nrail stage 1 is not a total waste of money, there may not be a huge power gain but it is enough that I wouldn't want to go back to stock. Plus it is the first step in building a more powerful engine,hence the name!
@ donny i have no crossover tube and popping still happens
@ rack'nrail stage 1 is not a total waste of money, there may not be a huge power gain but it is enough that I wouldn't want to go back to stock. Plus it is the first step in building a more powerful engine,hence the name!
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Road Warrior
Joined: Aug 2008
Posts: 1,500
Likes: 0
From: Brunswick, OH
I had some decel popping recently, so I tried a new PCIII map from Power Commander's website. I was using a map that came with my PCIII (you tell them your setup, they load you a map) and I also noticed some missing when the bike was cold. I loaded a map for a Dyna with V&H full system, stock ECU and stage 1 a/c, and all's well now.
