O2 Sensor Question.
Tech Contributor
Joined: Sep 2005
Posts: 1,731
Likes: 82
From: New Market AL
I setup my tune to run OL from idle up to 1200 rpm. Above 1200 it switches back to closed loop. I have my idle AFR fairly lean to help with fuel economy and it gives a little more choppy idle. I do have a little surge at low rpm cruise (like through a parking lot or construction zone). It's just the trade off with having headers and a mid-size cam.
Safety Car
Joined: Aug 2011
Posts: 4,439
Likes: 405
From: Portland OR
I setup my tune to run OL from idle up to 1200 rpm. Above 1200 it switches back to closed loop. I have my idle AFR fairly lean to help with fuel economy and it gives a little more choppy idle. I do have a little surge at low rpm cruise (like through a parking lot or construction zone). It's just the trade off with having headers and a mid-size cam.
Ron
Tech Contributor
Joined: May 2008
Posts: 3,100
Likes: 17
From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
I actually think it's quite possible you can get a better tune and a smoother engine without the O2s, as the PCM is programmed to run rich/lean cycles to properly burn off hydrocarbons and CO, each of which requires different oxygen content. An excellent tuner with good data can smooth this out so the engine runs stoichiometric all the time.
Safety Car
Joined: Jul 2005
Posts: 3,572
Likes: 9
From: Jackson Tn
St. Jude Donor '06-'07-'08-'09
it's a hybrid tune. do a search on the HPTuners forum and there are lots of info on how to do thus.
I think there is some here: http://www.hptuners.com/forum/showthread.php?t=36318
I think there is some here: http://www.hptuners.com/forum/showthread.php?t=36318
Tech Contributor
Joined: Sep 2005
Posts: 1,731
Likes: 82
From: New Market AL
Thanks for providing the link Printman... it was late last night when I posted that, and I still had to install the exhaust pipe and O2 sensors on the 2004 that I am working on. I finished it around 1:15 am and got back up for work at 5:30. All I have to do when I get home is upload the startup tune and hit the key. Hopefully I'll be turning it back over to the owner this weekend, after having it in my garage for 3 weeks.
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