I've been running open loop for a few years using wideband O2 sensor and never an issue. AFV set to 103. Bike not street ridden though.
Mike check this out. Shaved 4.5 lbs off the drivetrain with this setup. You need it.
Did you guys change your timing at all from stock? I have left mine stock but Hammer Performance suggested Harley stock maps may be too aggressive for the big bore kits due to the higher compression.
What primary is that? And do the do multiple ratios?
Yes the ignition timing maps were changed. The stock and race timing maps are ok up to a certain point. What’s your compression ratio now? Did you get the 30 degree reverse dome pistons?
I am running the stock timing map right now. Looking through old posts it looks like I played around with timing about 10 years ago, wasn't satisfied with any changes I made or the race timing maps, and went back to stock. I have the 30 degree reverse dome pistons with a target compression ratio of 10.5:1. I have never actually measured it.
Running open-loop still lets the ECM correct for lean conditions. I seem to help bottom power more than anything. The bike pulls a well-running open loop.View attachment 15205