Ditched the autotune
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Tourer
Joined: Apr 2013
Posts: 432
Likes: 63
From: Savage
You're right. I've run several sessions of AT. My CFR's snap crackle & pops all of the time. I called FM and the guy said people call all the time with the same issue with our beloved CFR's. The only way to stop the popping sound is to get a new muffler.
CFR's don't tune well. But that's the cost we pay...
CFR's don't tune well. But that's the cost we pay...
Ultimate HDF Member
Joined: Nov 2005
Posts: 5,926
Likes: 138
From: NE Ohio
There are a lot of people running the streets with partially tunes bikes. Sure setting the AFR will make a huge improvement, but a whole lot more could be left sitting on the table by not addressing timing and possibly other areas of the map.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
Likes: 11,212
From: San Diego, CA
He didn't say how he tuned it, but Auto Tune Pro will also adjust the timing. FM suggests tuning the VE tables and then tuning the timing tables w/ PowerVision & AT Pro.
If you start with a tune for your mods, from a reputable tuner, the timing tables should be real close. These tunes are usually based on dyno tunes of the same bike with same or similar mods.
My experience (although limited to tuning just 4 different bikes), the basic auto tune will do a good job of adjusting the tune for the difference in your VE table v the bike actually dyno tuned...
With a close map, the AT Pro (using wideband O2 sensors) should be able to really dial in the map.... the difference between AT pro on a good map, and a dyno tune is the knowledge/experience of the tuner v the PV/AT software. Sadly, in a lot of cases, the tuner isn't as good.....
I was surprised that AT Pro on an FM map wouldn't be awesome....!!
I missed that the OP had CFRs.... I've read they can be "hard" (PIA) to tune on other forums...
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Tourer
Joined: Apr 2013
Posts: 432
Likes: 63
From: Savage
I'm considering borrowing a set of different mufflers just to see if my tables above 3500 RPM change. It appears that my bike is lazy staring around that point. I know this isn't ideal, but it may get me more accurate readings while auto-tuning. I have the stock mufflers, but I think they would be too restrictive to get close VE tables.
Just to stress, I like playing with this stuff and learning on my own, which is why I haven't had it professionally dyno'd........yet!
Just to stress, I like playing with this stuff and learning on my own, which is why I haven't had it professionally dyno'd........yet!
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General Harley Davidson Chat
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May 25, 2013 10:16 AM
