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Exhaust pipes with less popping

13K views 31 replies 16 participants last post by  half_crazy 
#1 ·
I took the plunge and modified the factory pipes on my bike by removing the baffles. It sounds great but had a little popping with shifting. So I was advised to have Lloyds install their fuel controller, high performance air filter and IAV and disconnect the 02 sensors. I went to Myrtle Beach when they were there and had this completed and ran across the dyno. All was good but on my trip back to NC the popping was still there. I sent Lloyds an email and have yet to hear from them. So much for their great work and customer service. Any suggestions for the problem? Maybe install baffled pipes? If so, what suggestions do any of you have. I don't want loud pipes but a good deep sound.
 
#2 ·
I had some popping but virtually eliminated it by taking everything off and running a Stg 1 flash, nascar6 pipes, Llyodz air filter and plugging in the O2s. I don't notice a change in power and, unless I add cams, this setup works very well for me.

Ride safe.
 
#3 ·
I have a 2012 xc, I put thrush glasspacks in my stock mufflers following the threads instructions here. I have pulled the rubber strip out of in front of the tank, my O2 sensors are still connected, and I have almost no popping at all. I tried unhooking my O2 sensors for one day and it popped between shifts and on decel, so I hooked them back up again.
 
#4 ·
I modified my S1's I pulled all the fiberglass out of them.
No IAV no tuner top air filter and 02's hooked up.
Yes I get popping but I have noticed is that the dew-point or humidity makes the difference if i get popping. Days when there is little moister in the air there is less.
What I'm trying to say its hard to get ride of the popping cause you tune it one day and weather changes and your tuning is gone.
So be happy your ridding
 
#5 ·
ive been wondering about the o2's myself, every one says un-hook them but even completely stock when i did i would get a pom pom on de-cel that i never got before. i haven't rode enough since i put the thrush mufflers in to know for sure, but on short rides they don't pop. my muffler guts were really sooty black too, i wonder if un-hooking the o2's were making it too rich. i'm going to run it with them un-hooked for a while longer and look at the plugs.
 
#6 ·
My plugs are pretty much black when I have pulled them out, so I am to rich for whatever reason. I haven't killed it at speed and pulled a plug yet though, mine has been after getting home, but its 25 miles of highway driving home for me.
 
#11 ·
ah, of COURSE they are black. You pulled your O2 sensors so the system simply pours in excess fuel. No mystery here, right?
 
#8 ·
You are right to a point. I did get in contact with Lloyd and we talked. They are nice people and I didn't mean to slam them too hard. Just a little. I am self employed and if I put "contact us" on my website, someone should be there answering no matter what mode of communication it is. Or, you lose business. Just sayin.
 
#9 ·
I used to have a 08 kingpin and i did all the stuff you did and to me it was the biggest waste of$$ i ever spent. I had it installed at the dealer and had it dynoed ,but the popping never went away. Now i have a cc and all i did was put rpw slip ons and stage 1 reflash runs and sounds awsome! not 1 pop ever. guys start unplugging o2 sensors, taking out the air filter strip and all that BS then they are suprised the bike runs or sounds like **** and its popping!!from my own experience that i had the fuel controller,iav valve and all the rest is a big sales gimmick.we have a 106ci motor to me its plenty of power and we talk how HD guys are always trying to make there bikes faster,but it seems that we are going down that same road. I agree with some better sound than the factory lawn mower they give us but going beyond that you are opening a can of worms. my 2cent and my own experience i had with all this stuff.:D:D
 
#10 · (Edited)
If its just popping on decal in gear its fairly normal, just probably made louder with your mods. You can tune it to reduce the amount, but its pretty normal in higher performance engines, take a notice behind a corvette or Camaro or other manual sports car and listen to their exhaust when they come off the accelerator.

That being said, usually a properly adjusted IAV valve seems to reduce popping in our bikes, and from what I understand it works best with the O2 sensors plugged in.

The popping is caused by the fuel mixture in the exhaust cycle when you come off the throttle therefore stop providing optimal AFR as well as spark, but since the bike is still in gear the transmission keeps spinning the engine. When enough gas gets sucked in during the overlap between exhaust and intake valves being open at the same time it can ignite from the heat of the engine and cause the popping. Tuning the popping out is basically making it so the amount of gas coming in is either too much or not enough produce the AFR needed for it to ignite from the heat, but theoretically I believe that means the fuel then gets burned off by your cats instead, the downside to trying to tune it out is that you will not be able to get it tuned out for every rpm under every heat condition and air density condition all at the same time. That little decal popping is not harmful to the engine, a true afterfire can be a warning of something bad, but the decal popping can be avoided by simply pulling in the clutch if you don't tune it out. Some people like the sound of it though.

And shooter, its all about getting the right combination of components to do what you want to do, I have a stage 1 flash, thunder exhaust, and high flow intake, and lloydz adjustable IAV and my bike runs exactly how I like, small amount of decal popping from high rpms but that's just because that's how I ride. Oh and I have my O2's plugged in, there's no real valid reason to unplug them in my opinion, even with a PC fuel management you can leave them plugged in to let your idle maps remain close to factory, all unplugging them really does is richen up your mixture at idle and low rpm's where it doesn't really matter for actual performance.
 
#13 ·
Very good info here. However, the popping I am having is while shifting gears up when starting out. It's annoying.
 
#12 · (Edited)
I took the plunge and modified the factory pipes on my bike by removing the baffles. It sounds great but had a little popping with shifting. So I was advised to have Lloyds install their fuel controller, high performance air filter and IAV ...
The IAV is the ONLY thing that addresses backfiring/popping. What have you done to change it's settings/adjust it so far?
 
#16 ·
I'm not sure which way to turn it. Kyle told me if I did'nt like the way it cranked up cold to adjust the valve out a half turn, but it could cause popping. So...I would assume turning it in would help with popping. Am I correct?
 
#18 ·
Thundermax

If you are serious about performance issues for your motorcycle and want a high quality tuner for your Victory motorcycle this is what we need to do.
I have contacted Zippers to find out when they will be coming out with the Thundermax Tuner (CCU) for Victory. This is what they said.

"At this time there are no plans to develop a unit for Victory Motorcycles."

This is the BEST TUNER money can buy for a HD. It is a closed loop system that works all the time. I have on on my Road King and that bike has never missed a beat in 50,000+ miles. It get rid of decel pop and does it own auto tune. It is also very adjustable via a computer linkup that you can do your self.

We all need to email Zippers at:
zippers@zippersperformance.com

and request that they produce a Thundermax for Victory Motorcycles.

This is the best possible mod you could ever do to your bike. KEN
 
#20 ·
Why not try it BOTH ways and see if one way resolves your issues?
 
#22 ·
Pulling the O2's richens up the fuel at idle and low RPM, the popping can be reduced by both richening and leaning the idle fuel, either direction it goes will make the AFR not ideal for the heat to ignite it without spark. There really is no one perfect way to set up the bike that will work for all, the engines are all slightly different and with all the different mods done make them even more different, so what works for one may not work for another.
 
#23 ·
Yes, for me with the strip removed and the mufflers I have in it now with the O2 sensors hooked up there is almost no popping.
 
#25 ·
Lem,
Thanks for the info. Have a question. Do you recommend the stage 1 flash over the Lloydz fuel controller? I need to get one or the other and they are close in price when you add in the dealer cost to program the stage 1 flash on your bike.

Thanks
John
 
#26 ·
I suppose it depends on what you are going to do with your bike. If all you think you will do engine wise is exhaust/air filter, then the flash will probably do you just fine. If you plan on doing anything further, or might, or even just want a little more customization the fuel controller is probably a better investment. You might want to call up Lloydz though if you plan on going that route as I believe they are about to release a new version of their controller.
 
#27 · (Edited)
exhaust

i mod my xr exhaust, its the loudest pipes i heard yet on the cross bikes, 02 still hooked up, k&n air filter, no pops, runs great, no flash , i took a video but it would not unload on here so i made one on you tube, hope i did it rite, never made one before lol,

spoons asmc you tube 2011 victory xr exhaust
 
#28 ·
i mod my xr exhaust, its the loudest pipes i heard yet on the cross bikes, 02 still hooked up, k&n air filter, no pops, runs great, no flash , i took a video but it would not unload on here so i made one on you tube, hope i did it rite, never made one before lol,

spoons asmc you tube 2011 victory xr exhaust
What mod's did you do?
 
#30 ·
xr exhaust

thank you , its took a while to get it rite, i have an extra set of pipes, i m doing now, i know a guy wants them, , i went through some pipes to get it rite, i was looking at pipes, 500 bucks plus remap $200, or pfc 269 bucks, i m happy with my pipes
i call them s.e. pipes ( spoons exhaust) lol

spoons asmc
 
#31 · (Edited)
thank you , its took a while to get it rite, i have an extra set of pipes, i m doing now, i know a guy wants them, , i went through some pipes to get it rite, i was looking at pipes, 500 bucks plus remap $200, or pfc 269 bucks, i m happy with my pipes
i call them s.e. pipes ( spoons exhaust) lol

spoons asmc
So;
What did you end up doing to the pipes to make them work?
 
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