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Old Mar 1, 2012 | 02:14 PM
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OK so I got a thunderheader,also I have a stage one breather and PCV from fuel moto(great folks) anyway I had decel popping called Fuel Moto got a map fixed that but now its back ,plus at the muffler end collector whatever it is all black like **** so to speak. I am attaching a picture it sux but maybe you can see whats goin on. Is it normal? I have reloaded the map still same sh**

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Old Mar 1, 2012 | 02:18 PM
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the decel popping stopped after the remap and then started again? Have you checked your plugs?
 
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Old Mar 1, 2012 | 02:22 PM
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yeah I checked those first the seem to look fine
 
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Old Mar 1, 2012 | 02:48 PM
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did you check/retighten the exhaust nuts after awhile? your better off dynoing the bike, a map alone gets it close but not close enough.....
 
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Old Mar 1, 2012 | 02:51 PM
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been researching since posting this thread,and found that it is common for chrome thunderheaders turn black at the collector "There are also a lot of people run TH's and love them. It seems that every TH I see suffers from the same problems after a while though. The start to look crappy around the collector and blue, or turn a bit black if they are chrome" I am gonna put new plugs in and reload the map and try again to stop the decel I will let yall know how it turns out
 
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Old Mar 1, 2012 | 02:54 PM
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I had the same problem with mine it took a custom built on a Dyno map to get rid of it. The soot at the end of the pipe is normal for a Thunderheader.
 
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Old Mar 1, 2012 | 02:54 PM
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Originally Posted by 07bobber
did you check/retighten the exhaust nuts after awhile? your better off dynoing the bike, a map alone gets it close but not close enough.....

I just checked all that, and you are right about dynoing the only problem is the dealer where I live is like way to expensive for me 325.00 hour,maybe one day
 
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Old Mar 1, 2012 | 03:11 PM
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decel popping will not cause any damage to your pipeor bike,also when a good amount of soot builds up the popping will go away on it's own! i miss it now that it's gone!
 
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Old Mar 1, 2012 | 03:32 PM
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Decel popping may indicate a leak where the pipe meets the cylinder head.
 
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Old Mar 1, 2012 | 03:37 PM
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Originally Posted by macnab_sf
Decel popping may indicate a leak where the pipe meets the cylinder head.
Good place to start. I suggest a dyno tune. Remote tuning is fine if every motor was the same and we all lived at the same elevation but we don't. A dyno tune is custom,so any little difference or variation can be tuned for on the spot.
Amd from what I have read the thunderheader costs a bit of torque on the bottom end. Perhaps a dyno tune can help you there.
 
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