Vance and hines Big Shots issue - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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Old 09-24-2011, 08:52 PM   #1 (permalink)
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Vance and hines Big Shots issue

I have a 2011 street Glide 103. Bike has 2300 miles on it. Last month had V&H Big Shots, Arlen ness Big Sucker, and PC-V installed on the bike. Since the installation I have had an issue with decel popping in the 1600 to 1900 rpm range after deceleratinging from a cruising ride in 4th gear running 35-45mph. If i ride the bike hard there is no decel pop in the same rpm range. I have had the bike back to the installer 3 times with no change. I have also had the bike dyno-ed by a dyno jet authorized dealer with no change. The bike runs awesome and has plenty of get up and go while excelerating and is a beautiful ride while cruizing. I just cant seem to get rid of this popping on deceleration. Any ideas?
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Old 09-24-2011, 09:56 PM   #2 (permalink)
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I think its normal, its not a loud or hard popping, barely noticeable by any one other than you?
Don't happen all the time?
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Old 09-25-2011, 12:48 AM   #3 (permalink)
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Make sure you let all the way off on the throttle. It pops because some unburned fuel goes out the exhaust and then ignites. See if there is an adjustment on your tuner. I have the ThunderMax ECM and I can adjust for de-acceleration. But if I am not all the way off the throttle it will sometimes pop a little bit.
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Old 09-25-2011, 07:42 AM   #4 (permalink)
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I have same problem. 2008 street glide V&H big radius. seems to pop more the hotter it is
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Old 09-25-2011, 08:49 AM   #5 (permalink)
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Decel popping can be due to a leak as well as a lean condition. If your plugs look good and the AFR is good throughout the rev ranges on a dyno run, then you're fine.

People fail to realize that performance pipes have much less backpressure and are prone to making more noise on decel. It's not always an indication of something being wrong...as long as the basics are all taken care of.

1.) No leaks

2.) AFR is correct

3.) Plugs are good color.
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Old 09-25-2011, 04:16 PM   #6 (permalink)
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You can add fuel into your map at the 0% throttle setting in your PC-V. Dyno jet usually recommends leaving the 0% throttle alone, I have fuel added in that throttle setting and have almost eliminated all of the decel pop. Your pipes are popping because your bike is lean at the 0% throttle position, which is where your throttle position usually where your at while downshifting and decelerating. Don't be afraid to play with your map settings. As long as you save your original map you can always reload it if needed.
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Old 09-25-2011, 04:34 PM   #7 (permalink)
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I have close to the same setup. 2011 SG; 103, Monster Rounds, True Duals, Big Sucker and a Master Tuner. Had the same problem after the Dyno. Some is normal. Too lean at 0% throttle was the issue. A little juice at 0% throttle fixed it mostly. I am due to record my sound this evening. I will see if I can get it loaded somewhere and send a link. With a small bump, I get a little when hotter, but not too much. A few less mpg as well, but the bang for the upgrade is worth it.
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Old 09-25-2011, 08:05 PM   #8 (permalink)
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Made the kid across the street cry. Yikes. Not too good of a recording. I will start a new thread and post.
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Old 09-26-2011, 12:49 PM   #9 (permalink)
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Thank you all for the info. I will try some of this stuff out and see what happens.
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Old 09-26-2011, 12:52 PM   #10 (permalink)
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Doesn't sound like anything other then decel resonation to me..... Loud pipes revved, and expect some garbling on decel, especially if sitting still.

You could see black smoke come out of the pipe one time you revved it. That's not lean.....
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