Dual O2 Sensors & A/F Readings @ WOT
#1263438
07/07/12 12:39 PM
07/07/12 12:39 PM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
OP
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OP
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For those of you who run the dual O2 sensors (one per engine side), how close are you getting your WOT A/F readings from one side to the other?
I am currenty reading .4 difference from the drivers side to the passenger side with a RPM dual plane intake. After some stagger jetting on the secondary jets, I have closed up this spread from .8 to .4 from one side of the engine to the other. How close do you try to tune your A/F readings from one side to the other at WOT?
Thanks allot!!
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Dual O2 Sensors & A/F Readings @ WOT
[Re: YO7_A66]
#1263439
07/07/12 12:58 PM
07/07/12 12:58 PM
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Joined: Jan 2003
Posts: 3,831 N.E. Ohio
6bblFLASH
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I`m curious too. I plan on doing this in the 68`.
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas 9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ! 2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Dual O2 Sensors & A/F Readings @ WOT
[Re: AndyF]
#1263443
07/07/12 05:37 PM
07/07/12 05:37 PM
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Posts: 3,300 Northern Indiana
Dunnuck Racing
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Andy made a good point, I have seen some different headers on the same engine make big changes on cylinder to cylinder readings. Keith
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Re: Dual O2 Sensors & A/F Readings @ WOT
[Re: nz383man]
#1263445
07/07/12 08:56 PM
07/07/12 08:56 PM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
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My passenger side was showing richer on the O2 gage so I pulled the plugs and they confirmed that side was definately richer. I know what my safe limit is on my WOT reading, now I am trying to determine how close I can get each side to each other with a dual plane intake on my sb. Is .4 good to you racers or do you like to see both sides a little closer to each other than that? Thanks for the replies.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Dual O2 Sensors & A/F Readings @ WOT
[Re: Cab_Burge]
#1263447
07/08/12 09:53 AM
07/08/12 09:53 AM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
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OP
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""OP, it wouldn't suprise me that you may need to have staggered jetting on the primary side of the carb also with the dual plane intake Don't be afraid to experiment and learn some more"" I made another secondary jet change this morning which staggers the rear side to side by 6 jets. I should be able to test it later on today. I am trying to stay away from staggering the primary side since my A/F numbers up to 3500rpms are within .2-.3 from side to side. I have thought about staggering the pvcr's though if the secondary jetting gets out of hand. Thanks CAB
Back to the original question. How close are you guys trying to get from one side of the motor to the other at the end of the track? Thanks to all!!
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Dual O2 Sensors & A/F Readings @ WOT
[Re: Cab_Burge]
#1263451
07/11/12 09:24 PM
07/11/12 09:24 PM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
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I tested a six jet stagger in the rear of the carb with the leaner jet on the passenger side. Since this is a street car, I made three test runs from a 50mph cruise to WOT shift point. All three times each sensor read 0 or .2 different from the other sensor. I went from a .5/.6 difference per side when jetted evenly in the rear to tonight's 0/.2 difference with a six jet stagger. Note: My primaries stayed even.
I'm happy with that!!
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Dual O2 Sensors & A/F Readings @ WOT
[Re: davenc]
#1263454
07/12/12 08:55 AM
07/12/12 08:55 AM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
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Before I staggered the jetting, the performance at the WOT was lazy especially when the hotter Summer air set in. Then when I noticed the A/F difference in the sensors, I figured that is was just too rich for my combo. If I leaned out both rear jets at the same time, then I lost power and I got detonation at WOT. Then when I jetted back up, there was no detonation but the performance was down. So once I leaned out the side that was rich, the seat of the pants performance came back. I was very happy with the reaction of the car. I am not close enough to a track to do any testing. My car is a street car and fortunately I have some areas that I can hit WOT without bothering others for my testing. I have not done an idle to WOT (shift point) test but maybe in the near future I can try that out.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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