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What's up with this A/F reading? #1091342 10/09/11 05:15 PM 10/09/11 05:15 PM
Joined: Feb 2003 Posts: 3,456 Out West 4 408strokerdart OP master
408strokerdart OP master 4 Joined: Feb 2003 Posts: 3,456 Out West	I know I don't have any "real" data yet, but why would one side be so far off of the other side? I am reading from the same point on each side of the engine and am getting readings (just idle and intermediate so far) that are 5 whole numbers different from side to side. Any idea where i should start looking? Something obstructed in the carb? Air bleed plugged? Just looking for any thoughts from anyone that has gone thru this.

Re: What's up with this A/F reading? [Re: 408strokerdart] #1091343 10/09/11 05:35 PM 10/09/11 05:35 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	First make sure the headers are tight

Re: What's up with this A/F reading? [Re: MR_P_BODY] #1091344 10/09/11 05:47 PM 10/09/11 05:47 PM
Joined: Jun 2003 Posts: 9,225 Charleston S sixpackgut Drag Week Mod Champion
sixpackgut Drag Week Mod Champion S Joined: Jun 2003 Posts: 9,225 Charleston	misfiring cylinder Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs

Re: What's up with this A/F reading? [Re: sixpackgut] #1091345 10/09/11 06:18 PM 10/09/11 06:18 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	swap the sensors side to side before doing anything drastic BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: What's up with this A/F reading? [Re: bigtimeauto] #1091346 10/09/11 07:45 PM 10/09/11 07:45 PM
Joined: Aug 2003 Posts: 43,200 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,200 Bend,OR USA	Quote: swap the sensors side to side before doing anything drastic Waht intake and carb are you running? Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: What's up with this A/F reading? [Re: Cab_Burge] #1091347 10/09/11 09:43 PM 10/09/11 09:43 PM
Joined: Feb 2003 Posts: 3,456 Out West 4 408strokerdart OP master
408strokerdart OP master 4 Joined: Feb 2003 Posts: 3,456 Out West	Quote: Quote: swap the sensors side to side before doing anything drastic Waht intake and carb are you running? Quickfuel 1050 dominator on a 598 casting chapman ported intake. I kept the sensor with the controller it was calibrated for straight from Racepak. I can swap sides and re-check though. All valid points to check before tearing into anything. I will hit the exhaust tubes with the infra-red gun to check for mis-fire. Engine sounds to good to be to far out of whack. Keep the ideas coming though. Thanks.

Re: What's up with this A/F reading? [Re: 408strokerdart] #1091348 10/09/11 11:08 PM 10/09/11 11:08 PM
Joined: Apr 2006 Posts: 729 Lebanon,IN M mr2performance super stock
mr2performance super stock M Joined: Apr 2006 Posts: 729 Lebanon,IN	What's it look like going down the track. If it has open headers you'll have a tough time making sense of anything except wot. Mike MR2PERFORMANCE RACE CARS 765 483 9371

Re: What's up with this A/F reading? [Re: 408strokerdart] #1091349 10/09/11 11:37 PM 10/09/11 11:37 PM
Joined: Jan 2003 Posts: 16,928 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,928 NC	Where exactly are your sensors located, and exhaust system configuration? What are the actual readings? What fuel are you running? gas, methanol, E85, natural gas (methane), etc. You said 5 numbers, do you mean 13.0 and 8.0 AFR?

Re: What's up with this A/F reading? [Re: mr2performance] #1091350 10/10/11 06:44 AM 10/10/11 06:44 AM
Joined: Nov 2009 Posts: 520 New Zealand nz383man mopar
nz383man mopar Joined: Nov 2009 Posts: 520 New Zealand	Quote: What's it look like going down the track. If it has open headers you'll have a tough time making sense of anything except wot. Mike To get a good reading at lower RPMs you need the sensors 10 times the diameter of the pipe from the outlet, thats 35" foward of the outlet if you have 3.5" pipes. You would be amazed how much reversion you can get with big pipes at low speed.

Re: What's up with this A/F reading? [Re: nz383man] #1091351 10/10/11 12:20 PM 10/10/11 12:20 PM
Joined: Feb 2003 Posts: 3,456 Out West 4 408strokerdart OP master
408strokerdart OP master 4 Joined: Feb 2003 Posts: 3,456 Out West	Will get some WOT graphs asap. I understand that they are the most important on a drag car. This is on C14 fuel, dynotech merge collectors with the sensors in the top of the collector just past the merge. 4" open collector, about 10-12" past the sensor. Sensors are Racepak/bosch tied to a Sportsman data recorder thru individual O2 controllers. Readings are 22.X on one side and 17.X on the other side. Bring the RPM up some and they come down to 17.X and 12.X respectively. Last edited by 408strokerdart; 10/10/11 12:32 PM.

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