I installed a wide band o2 sensor on the midpipe and tuned with PowerTronics.Has anyone installed a separate O2 sensor and gauge to see what the air fuel ratio is after making intake or exhaust modifications? The AFR readings at different rpm could show how well the stock ECU is adjusting to those mods and whether an ECU update is necessary.
Nearly killed myself: I always looking at the gauge. Be careful if you add a gauge.
I reconfigured map to change every 100 rpm to find and fix a lean flat spot. I also found that with stock muffler (2019), premuffler and cat delete it ran richer in top end, I leaned it out quit a bit on the top. Weird, thought it usually goes lean ? Anyway, runs like a scalded Chihuahua.
Didnt help much with the main problem: lean stuttering and jerking below 4000. For that I added 2 potentiometers and switch across wires coming from stock lamba to make it run at afr 13.5 in open loop, or I switch to other potentiometer circuit for 14.5 for highway cruising. Runs smooth.
Its just too loud now. How do I fix that without putting premuffler back on ?