De-catted and now decel popping help
Thread Starter
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Cruiser
Joined: Jun 2009
Posts: 132
Likes: 0
From: Silicon Valley, Ca
De-catted and now decel popping help
11 SG, VH twin slash and de-catted stock pipe. It has popping at decel and between shifts and it seems to be getting a little worse with time. It still has the stock ECM cal, any thoughts on possible issues? Maybe an exhaust leak?
Any help is appreciated.
Any help is appreciated.
Tourer
Joined: Jul 2009
Posts: 493
Likes: 1
From: SoCal
It may be an exhaust leak. Here is a way to find it:
Get a 2-3 ft piece of plastic hose (water hose or smaller diameter clear hose from home depot). Put one end by your ear. Move the other end all around the exhaust joints/connections while the engine is running. You will hear the difference where there is a leak.
It is my experience that if you follow the manual instructions on how to install the exhaust, you have a pretty good chance of not having an exhaust leak. I just installed my exhaust after the 255 cam upgrade and it is leak-free.
Some other items... Do not re-use exhaust gaskets or clamps (they tend to become oval if over tightened). Use a bead of high temp RTV Silicon on the inside of the mufflers before installing them on the headers (to seal better, this is from the Rinehart manual). Use a tube spreader (cheap from Harbor Freight, medium size) to expand header/muffler end points that have the cuts.
Good luck.
Get a 2-3 ft piece of plastic hose (water hose or smaller diameter clear hose from home depot). Put one end by your ear. Move the other end all around the exhaust joints/connections while the engine is running. You will hear the difference where there is a leak.
It is my experience that if you follow the manual instructions on how to install the exhaust, you have a pretty good chance of not having an exhaust leak. I just installed my exhaust after the 255 cam upgrade and it is leak-free.
Some other items... Do not re-use exhaust gaskets or clamps (they tend to become oval if over tightened). Use a bead of high temp RTV Silicon on the inside of the mufflers before installing them on the headers (to seal better, this is from the Rinehart manual). Use a tube spreader (cheap from Harbor Freight, medium size) to expand header/muffler end points that have the cuts.
Good luck.
Last edited by boom23; Mar 3, 2012 at 11:18 AM.
Thread Starter
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Cruiser
Joined: Jun 2009
Posts: 132
Likes: 0
From: Silicon Valley, Ca
Boom23: yeah you are probably right on the money, was fiddling with the clamps (re-used) today and sure enough the crossover is not clamping solid. I will get new clamps and gaskets when I put in my SE 255's in the coming couple weeks.
Thx for the input.
Thx for the input.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
when you tighten the new torca clamps, go to the lower end of the torque spec, that may allow them to be reused a time or 2.
torca clamps deform when tightened and are considered one-use
mike
torca clamps deform when tightened and are considered one-use
mike
Extreme HDF Member
Joined: Jun 2007
Posts: 12,653
Likes: 18
From: Broken Arrow, Oklahoma
It may just be your bike. Mine was the same way when I put on the American Custom slip-ons without any baffles in them. I still have my CAT though. I put their "mid rumble" baffles in them and the decel popping stopped completely, and the bike ran much better. Gotta have some back pressure and the CAT wasn't enough apparently. In my opinion, the only option for my situation, or yours, may be a tune even if it's just a simple reflash by the dealer.
Road Master
Joined: Sep 2011
Posts: 867
Likes: 224
From: Pa
you either need to have a stg 1 download done or buy a good tuner to remap bike. your leaning it out from its already lean EPA mandated settings.
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Road Warrior
Joined: Nov 2006
Posts: 1,462
Likes: 121
From: Northern Illinois
+1. You need a new tune.
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Road Master
Joined: Sep 2010
Posts: 803
Likes: 1
From: Port St. Lucie FL
+1 on basically what others have said. When you de-catted your header pipe, you freed up the air restriction caused by the cat. Your letting in more air into the system without the corresponding addition of fuel by changing up your AFR, so what was a lean situation to begin with is now even more lean.
You already have the V&H twin slashes....if it were me I would go ahead and change the a/c over to something like an Arlen Ness Big Sucker or SE high flow a/c and and get yourself some kind of tuning device (Power Commander, Power Vision, SERT, TTS, etc) with a map designed for your set-up. Our friends at FuelMoto can help you out with this or there are lots of other sources as well. Once you get the tuning device you can also have the bike dyno'd if you want to dial it in exactly, but I think you will find that a custom map from someone like a FuelMoto will get you 90% of the way there without the added expense of a dyno tune.
You already have the V&H twin slashes....if it were me I would go ahead and change the a/c over to something like an Arlen Ness Big Sucker or SE high flow a/c and and get yourself some kind of tuning device (Power Commander, Power Vision, SERT, TTS, etc) with a map designed for your set-up. Our friends at FuelMoto can help you out with this or there are lots of other sources as well. Once you get the tuning device you can also have the bike dyno'd if you want to dial it in exactly, but I think you will find that a custom map from someone like a FuelMoto will get you 90% of the way there without the added expense of a dyno tune.
Intermediate
Joined: Mar 2010
Posts: 42
Likes: 0
I Have De-Catted several pipes now, here is the story of mine and my brother-in-laws save you from dropping $150.00 or more for remap. I decatted and debaffled the mufflers on my brother in laws bike first (he got his first) sounded great ran fine no popping on decel. so when I got mine 2 days after bringing it home I decatted the pipe I spent "SMART" money Screaming Eagle slip ons (Dumb Move They sucked) so I took it down the road Shift POW WTF decel popping, went to dealer "oh you need a Remap" OK here is $150.00 pick up bike take off Shift POW WTF long story short changed Exhaust gaskets no more POW no more WTF no more decel pop HUH $14.00 would have fixed it. Take it as you will but this is my experience.