Open or closed loop?

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Jun 30, 2015 | 02:11 PM

#11

fordhd2005

Road Master

Joined: Apr 2006

Posts: 863

Likes: 166

From: Athens, AL

Quote:

Originally Posted by skratch

you actually have that backwards. closed loop is when the ecm will read the info from the sensors.

My bad... That's what I meant...

Jun 30, 2015 | 06:19 PM

#12

kojak

Seasoned HDF Member

Joined: Jan 2007

Posts: 5,521

Likes: 3,922

From: Virginia

Quote:

Originally Posted by ridedaddy

I was wondering what most of you guys thought about running open loop tunes? Do most people that have had there bike Dyno tuned run the tune in open loop?

Your bike only runs in closed loop in steady state once it reaches normal operating temp. And the maximum adjustments with the Harley narrow band sensors are basically +/- 0.5 to the optimum afr (around 14.7). There is no such thing as open loop tunes vs closed loop tunes, it just depends on the inputs to the ecm that tell the bike when to go into closed loop and accept input from the O2 sensors to do the needed adjustment.