Stage 1 already on most 2016 models
Outstanding HDF Member
Joined: Aug 2012
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From: Detroit
First: Popping isn't an indication of a mixture problem. Most of the time, it's from fresh air coming in at the back of the pipe (reversion), which is more likely to happen with less restrictive or shorter pipes . Yes, you can bandaid this issue by changing the mixture to the point where is so far off on decel that it will no longer ignite, but understand that's what you're doing: You aren't fixing or correcting the mixture, but deliberately throwing it way off. The ECM won't automatically fix what isn't a mixture problem to begin with.
Second: Some of the corrective action of the ECM, such as that for open loop, isn't instantaneous. It keeps track of closed loop corrections and trims, and builds and applies adaptive tables from that. So it can take some operating time before the ECM applies its corrections. In a way, its like running "autotune" on the aftermarket tuners. These don't work instantly, but take some time to acquire and apply the needed data.
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
If "American Iron" was prioritized on pushing what Harley serves, then why would the magazine often find that a tune isn't needed, when they could be making Harley money by pushing their dealer dyno time and expensive Stage 1 downloads?
The real Koolaid is that the bikes need to be tuned for a Stage 1 mods.
The real Koolaid is that the bikes need to be tuned for a Stage 1 mods.
Road Master
Joined: Aug 2014
Posts: 1,132
Likes: 150
From: Michigan
Two things:
First: Popping isn't an indication of a mixture problem. Most of the time, it's from fresh air coming in at the back of the pipe (reversion), which is more likely to happen with less restrictive or shorter pipes . Yes, you can bandaid this issue by changing the mixture to the point where is so far off on decel that it will no longer ignite, but understand that's what you're doing: You aren't fixing or correcting the mixture, but deliberately throwing it way off. The ECM won't automatically fix what isn't a mixture problem to begin with.
Second: Some of the corrective action of the ECM, such as that for open loop, isn't instantaneous. It keeps track of closed loop corrections and trims, and builds and applies adaptive tables from that. So it can take some operating time before the ECM applies its corrections. In a way, its like running "autotune" on the aftermarket tuners. These don't work instantly, but take some time to acquire and apply the needed data.
First: Popping isn't an indication of a mixture problem. Most of the time, it's from fresh air coming in at the back of the pipe (reversion), which is more likely to happen with less restrictive or shorter pipes . Yes, you can bandaid this issue by changing the mixture to the point where is so far off on decel that it will no longer ignite, but understand that's what you're doing: You aren't fixing or correcting the mixture, but deliberately throwing it way off. The ECM won't automatically fix what isn't a mixture problem to begin with.
Second: Some of the corrective action of the ECM, such as that for open loop, isn't instantaneous. It keeps track of closed loop corrections and trims, and builds and applies adaptive tables from that. So it can take some operating time before the ECM applies its corrections. In a way, its like running "autotune" on the aftermarket tuners. These don't work instantly, but take some time to acquire and apply the needed data.
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
You could also shut off fuel on decel earlier than the factory ECM does, but that results in a more noticeable lurch between the injectors being on, shutting off, and turning back on again.
Factory systems with catalytic converters burn unburned fuel in the cats.
Another option is to reduce reversion, by using something like the Thunder Torque inserts. But again, this doesn't reduce unburned fuel in the pipes. It just makes it less likely to ignite.
Last edited by Warp Factor; Dec 27, 2015 at 06:11 AM.
Road Master
Joined: Aug 2014
Posts: 1,132
Likes: 150
From: Michigan
Kind of reminds me of the way cars smelled when I was a kid.
Last edited by rjo3491; Dec 27, 2015 at 03:48 PM.
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