Can I switch from open loop back to closed loop?
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Cruiser
Joined: Mar 2012
Posts: 177
Likes: 52
From: Chicago
Can I switch from open loop back to closed loop?
2015 Road Glide
107
Headwork
Reaper cams
Shorty 2-1
Power Vision
Years ago I had my bike tuned by a reputable tuner in my area, when I got it back the 02 sensors were off. He told me he likes to tune bikes in Open loop. Bike ran great, rode it all over the country. Never an issue with the tune.
Last year I had a 107, headwork and new cams put it by another tuner. He asked why it was in open loop. I told him about the previous tuner and added do what you think is best, I dont care if its open or closed loop. He left it in open loop. The bike ran better then before.
Over the last few months Ive noticed a noticeable decrease in power and popping on decel. Narrowed it down to an exhaust leak at the flange. Fixed it and now the bike is happy again and back to normal.
But it got me thinking, if I were in closed loop the bike might run better when things are a bit off. Can I just install my 02 sensors, flip the button in PV to closed loop and run it as is? Or would I need to re tune it?
Thanks
107
Headwork
Reaper cams
Shorty 2-1
Power Vision
Years ago I had my bike tuned by a reputable tuner in my area, when I got it back the 02 sensors were off. He told me he likes to tune bikes in Open loop. Bike ran great, rode it all over the country. Never an issue with the tune.
Last year I had a 107, headwork and new cams put it by another tuner. He asked why it was in open loop. I told him about the previous tuner and added do what you think is best, I dont care if its open or closed loop. He left it in open loop. The bike ran better then before.
Over the last few months Ive noticed a noticeable decrease in power and popping on decel. Narrowed it down to an exhaust leak at the flange. Fixed it and now the bike is happy again and back to normal.
But it got me thinking, if I were in closed loop the bike might run better when things are a bit off. Can I just install my 02 sensors, flip the button in PV to closed loop and run it as is? Or would I need to re tune it?
Thanks
Supporter
Joined: Oct 2022
Posts: 916
Likes: 840
From: Texas
You'll also need to change the AFR table to 14.6 in the area you want to run closed loop...cruise range. I like open loop. It seems to be smoother and more responsive.
I think canned tunes are closed loop so the ecu can compensate for differences in similar bikes and maybe to keep the EPA off the vendor's back.
There's a reason the new Power Core software for PV3 and PV4 limit what the typical user can see and modify. The old software may be an update away from getting neutered.
I think canned tunes are closed loop so the ecu can compensate for differences in similar bikes and maybe to keep the EPA off the vendor's back.
There's a reason the new Power Core software for PV3 and PV4 limit what the typical user can see and modify. The old software may be an update away from getting neutered.
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