help! back preasure question.
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Joined: Feb 2008
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From: Pikeville, KY
help! back pressure question.
ive had my nightster for 2 years. have vance and hines short shots of course. sound good but all my buddies took their baffles out and they sound incredible. so i decided to take the baffles out tonight. sounds incredible now, but my buddy followed me on the highway and said i was shooting blue flames every time i shifted.
i can't find good results by searching on here. does this mean I'm running rich or lean, and can this do any damage to my motor
and can it be fixed by a remap?
thanks for the help.
i can't find good results by searching on here. does this mean I'm running rich or lean, and can this do any damage to my motor
and can it be fixed by a remap?
thanks for the help.
Last edited by xharleyx; Apr 22, 2009 at 10:09 PM.
Tourer
Joined: Nov 2008
Posts: 394
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From: Brooklyn, NY
i put these baffles in to replace the stock ones gives it a deeper tone than straight pipes, and maintains enough back pressure so there is no need for a remap or rejet. they are just as loud as without baffles. actually louder than all my buddies softails with straight pipes.
http://www.bigcitythunder.com/pages/...rmonsters.html
http://www.bigcitythunder.com/pages/...rmonsters.html
Last edited by congo_usmc; Apr 22, 2009 at 10:38 PM.
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Joined: Dec 2004
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From: Texas! Ya mean there's someplace else?
You started out running leaner than you were before removing the baffles. But from what I understand about the models with O2 sensors, the EFI system computer adjusted the mixture back to the stoichiometric ratio, as long as you haven't messed with the intake end of your motor. This also assumes you're running the sensors, and that the module is working as designed.
The short length of the pipes, coupled with no baffles to slow and disperse your exhaust gases, allow the flame to be seen. A mixture adjustment to richen the beast a bit would be good for your engine, and probably get you a wee bit more power, but the flames will still be there.
The short length of the pipes, coupled with no baffles to slow and disperse your exhaust gases, allow the flame to be seen. A mixture adjustment to richen the beast a bit would be good for your engine, and probably get you a wee bit more power, but the flames will still be there.
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Joined: Feb 2008
Posts: 54
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From: Pikeville, KY
i put these baffles in to replace the stock ones gives it a deeper tone than straight pipes, and maintains enough back pressure so there is no need for a remap or rejet. they are just as loud as without baffles. actually louder than all my buddies softails with straight pipes.
http://www.bigcitythunder.com/pages/...rmonsters.html
http://www.bigcitythunder.com/pages/...rmonsters.html
Banned
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From: new britain ct
Check out this web site. (harley-performance.com) It my tell you what you want to know. HOLLYWOOD
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Joined: Jan 2009
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From: Marietta, Ohio
When it's really dark, even at idle you can see some flames just coming out of mine, when I crack into it hard and shift mine does that same thing. Mines got some mods though, and it's carbureted as well.
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Joined: Mar 2008
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From: Boise, Idaho
The flames could either be caused by running too rich or too lean, depending on when they happen - do flames appear when you start to accelerate or decelerate? If it's accelerate, then it's running too lean when there is a quick twist of the throttle. If it's decelerate, then it would be running too rich right when you let off the throttle. There are portions of the ECM programing that deal with these specific areas, and compensate for them. Either way it's not very good for your bike, and may cause problems long term.
With EFI, tuning is the way to get around them, and if you have put a new intake on the bike then you should definitely look into a tuner. I have the fuel pak now (am getting ready to upgrade to a TTS tuner next month) and it helps. The PCIII or Dynojet seem to get good praise around here as well, but may require dyno time at the dealer, which is pretty expensive.
The fuel pak would be the cheapest way to go, and as long as all you've done is intake and exhaust, should help solve your problem. I won't be needing mine next month if you'd be interested in getting a deal on one...
With EFI, tuning is the way to get around them, and if you have put a new intake on the bike then you should definitely look into a tuner. I have the fuel pak now (am getting ready to upgrade to a TTS tuner next month) and it helps. The PCIII or Dynojet seem to get good praise around here as well, but may require dyno time at the dealer, which is pretty expensive.
The fuel pak would be the cheapest way to go, and as long as all you've done is intake and exhaust, should help solve your problem. I won't be needing mine next month if you'd be interested in getting a deal on one...
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