O2 Sensor location? Collector or primary pipe

chevy620 · 03-09-2013, 04:01 PM

I have a data recorder that will record two O2 sensor readings. '
Would the collectors be the best spot since it has an open plenum intake I don' think you can really change it cylinder by cylinder.
Just interested in WOT air/fuel ratios.

Looks like we have to weld the collectors on anyway so there will be no air leaks from pipes to collectors.

Trying to decide whether to weld 8 bungs in primary pipes and two in collectors and switch the sensors around or just go with the collector??

Thanks,
Jok

Alan Roehrich · 03-09-2013, 04:10 PM

With stagger jetting and other methods you can change the cylinder to cylinder mixture distribution.

However, most people are better off using EGT sensors in the individual primary tubes, and putting the O2 sensor in the collector.

Altronics · 03-12-2013, 03:52 PM

Installing in the collector will give an average A/F reading for side of the motor. Typically when installed in the collector you will only get an accurate reading at higher rpm 3-4k plus, due to reversion effects at idle. Installing in header will give accurate reading from idle up, but only for that cylinder.

EGT's are not as accurate for precise tuning as wideband O2 sensors, but are more cost effective for matching cylinder to cylinder performance.

Be sure to click on our banner at the top of the page for ClassRacer member discounts!

chevy620 · 03-14-2013, 08:47 PM

Thanks guys, appreciate it.

Jok

03-09-2013, 04:01 PM	#1
chevy620 Banned Join Date: Mar 2009 Posts: 188 Likes: 0 Liked 0 Times in 0 Posts	O2 Sensor location? Collector or primary pipe I have a data recorder that will record two O2 sensor readings. ' Would the collectors be the best spot since it has an open plenum intake I don' think you can really change it cylinder by cylinder. Just interested in WOT air/fuel ratios. Looks like we have to weld the collectors on anyway so there will be no air leaks from pipes to collectors. Trying to decide whether to weld 8 bungs in primary pipes and two in collectors and switch the sensors around or just go with the collector?? Thanks, Jok

03-09-2013, 04:10 PM	#2
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,913 Likes: 995 Liked 1,037 Times in 272 Posts	Re: O2 Sensor location? Collector or primary pipe With stagger jetting and other methods you can change the cylinder to cylinder mixture distribution. However, most people are better off using EGT sensors in the individual primary tubes, and putting the O2 sensor in the collector. __________________ Alan Roehrich 212A G/S

03-12-2013, 03:52 PM	#3
Altronics Sponsor Join Date: Dec 2010 Posts: 89 Likes: 0 Liked 58 Times in 9 Posts	Re: O2 Sensor location? Collector or primary pipe Installing in the collector will give an average A/F reading for side of the motor. Typically when installed in the collector you will only get an accurate reading at higher rpm 3-4k plus, due to reversion effects at idle. Installing in header will give accurate reading from idle up, but only for that cylinder. EGT's are not as accurate for precise tuning as wideband O2 sensors, but are more cost effective for matching cylinder to cylinder performance. Be sure to click on our banner at the top of the page for ClassRacer member discounts! __________________ Fred Bartoli 847-923-0002

03-14-2013, 08:47 PM	#4
chevy620 Banned Join Date: Mar 2009 Posts: 188 Likes: 0 Liked 0 Times in 0 Posts	Re: O2 Sensor location? Collector or primary pipe Thanks guys, appreciate it. Jok