Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
Apex Paul
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Tuning / Diagnostics -- engine and transmission


Reply
 
Thread Tools
Old 02-23-2013, 02:20 PM   #1
StreetSS
 
Drives: 2011 Camaro SS
Join Date: Jan 2013
Location: VA
Posts: 160
Measuring AFR w/ Wideband

I plan to install an AFR wideband. Car has headers w/cats and x-pipe. Where is the best place to install the sensors, and do I need two sensors to measure AFR on each bank? Or, is measurement at only one side sufficient?
StreetSS is offline   Reply With Quote
Old 02-23-2013, 02:43 PM   #2
FrankT
400HP used to be enough..
 
FrankT's Avatar
 
Drives: 2010 2SS rs manual
Join Date: Aug 2009
Location: Central NC
Posts: 698
One side will do, although both is better. Make sure you install the sensor(s) BEFORE the cats.
__________________
Currently in the fleet... 2010 ZR1 Corvette, 2014 Cadillac CTS-V, 2010 Camaro SS single turbo, 2014 GMC Sierra Denali crew cab, 1967 Camaro SS350, 1969 Camaro SS427.

Build thread: http://www.camaro5.com/forums/showthread.php?t=47925
FrankT is offline   Reply With Quote
Old 02-24-2013, 07:54 PM   #3
StreetSS
 
Drives: 2011 Camaro SS
Join Date: Jan 2013
Location: VA
Posts: 160
Thanks! I ordered 2 since there seems to be some value added.
StreetSS is offline   Reply With Quote
Old 02-25-2013, 09:47 AM   #4
Iam Broke
PHAT B33
 
Iam Broke's Avatar
 
Drives: 2012 TF3 Camaro 2SS/RS M6
Join Date: Jun 2012
Location: Dark of the Moon
Posts: 1,437
Usually the DS bank runs a bit leaner so I put one there. Let us know what you see on the dual setup.
__________________
Another 1 of 371 '12 T3 LS3 M6's built.
Iam Broke is offline   Reply With Quote
Old 02-25-2013, 05:11 PM   #5
StreetSS
 
Drives: 2011 Camaro SS
Join Date: Jan 2013
Location: VA
Posts: 160
Quote:
Originally Posted by Iam Broke View Post
Usually the DS bank runs a bit leaner so I put one there. Let us know what you see on the dual setup.
Will do. I'll post some logs. May end up not being a good use of funds, but at this point, what's a few extra bucks... Plus I had a few beers by the time I got around to ordering.
StreetSS is offline   Reply With Quote
Old 03-02-2013, 10:21 PM   #6
Tampa Tuning
Account Suspended
 
Drives: TAMPA TUNING FACEBOOK & INSTAGRAM
Join Date: Oct 2010
Location: Tampa, Fl
Posts: 3,047
Make sure the wideband is at like the 3 o'clock position so the head doesn't get wet.
Tampa Tuning is offline   Reply With Quote
Old 03-21-2013, 08:19 PM   #7
StreetSS
 
Drives: 2011 Camaro SS
Join Date: Jan 2013
Location: VA
Posts: 160
As promised, if anyone is interested here are the datalogging results with 2 Aeroforce widebands. There are differences in readings in both the logs and on the gauge while driving normally, usually slight. Not sure if the info on both sides was useful to the tuner or not...
Attached Images
 

Last edited by StreetSS; 03-22-2013 at 07:58 AM.
StreetSS is offline   Reply With Quote
Old 03-21-2013, 08:40 PM   #8
Rhino79



 
Rhino79's Avatar
 
Drives: 2010 Camaro SS L99/Auto
Join Date: Jul 2011
Location: Cabot, AR
Posts: 2,514
Pretty rich, but that should be good data for an updated tune!
__________________

Specializing in LS performance and calibrations.
Custom Grind LS 3 bolt and VVT Camshaft packages.shop.Gwatneyperformance.com
Ryan@gogwatney.com Aaron@gogwatney.com
Rhino79 is offline   Reply With Quote
Old 03-21-2013, 10:09 PM   #9
StreetSS
 
Drives: 2011 Camaro SS
Join Date: Jan 2013
Location: VA
Posts: 160
Already got the retune and ready to upload it tomorrow. Quick turn around at JRE!
StreetSS is offline   Reply With Quote
Old 03-22-2013, 12:30 AM   #10
newb

 
newb's Avatar
 
Drives: 2013 1LE
Join Date: Feb 2012
Location: DMV
Posts: 1,401
Did you install the O2's before the cats? If so, do you have a pic of them installed? I am considering the same setup. Just curious about the positioning because I will have to get the bungs welded onto the mid pipe. I have been told that you can just use the downstream (post cat) bungs since you tune out the second set of 02s anyway.
__________________
Delivered 21 Jan 2013

newb is offline   Reply With Quote
Old 03-22-2013, 08:21 AM   #11
StreetSS
 
Drives: 2011 Camaro SS
Join Date: Jan 2013
Location: VA
Posts: 160
I installed before the cats just after the collector. There is not much real estate in this area on my car. I used the do-it-yourself AEM clamps with the bung pre-welded. I got tired of taking my car to shops and having them ding or scratch it. Easy install using a stepped drill bit. Not the best picture...
Attached Images
 
StreetSS is offline   Reply With Quote
Old 03-22-2013, 08:30 AM   #12
Can't_C_Me
Don't Sleep on My V6
 
Can't_C_Me's Avatar
 
Drives: 2016 C7 1LT
Join Date: Dec 2010
Location: Oxford, GA
Posts: 3,594
I thought about adding a 2nd wideband sensor also but was told the reading would be off a little. But it doesn't look to off. May try this later on also. What meter are you using?

Sent from my Samsung Galaxy S III
__________________
Can't_C_Me is offline   Reply With Quote
Old 03-22-2013, 09:00 AM   #13
StreetSS
 
Drives: 2011 Camaro SS
Join Date: Jan 2013
Location: VA
Posts: 160
Quote:
Originally Posted by Can't_C_Me View Post
I thought about adding a 2nd wideband sensor also but was told the reading would be off a little. But it doesn't look to off. May try this later on also. What meter are you using?

Sent from my Samsung Galaxy S III
Using an Aeroforce Interceptor w/ their AFR kit. Also using SCT handheld to log.
StreetSS is offline   Reply With Quote
Old 03-25-2013, 08:09 AM   #14
newb

 
newb's Avatar
 
Drives: 2013 1LE
Join Date: Feb 2012
Location: DMV
Posts: 1,401
I am not sure why its so important to go in before the cats? On the dyno. The probe is inserted at the tail pipe. Obviously well after the cats. Why can't the now useless post cat bungs be used? Since the secondaries are tuned out... Hopefully someone can help answer my question


Sent from my iPad using Tapatalk HD
__________________
Delivered 21 Jan 2013

newb is offline   Reply With Quote
Old 03-25-2013, 10:08 AM   #15
white ZL1

 
Drives: none
Join Date: Aug 2011
Location: DFW area
Posts: 1,835
Post cat readings will typically be a bit leaner than readings taken before the cats.
I've seen anywhere from 1 tenth to 5 tenths leaner at the tailpipe vs before the cats on different cars at different points in time.
white ZL1 is offline   Reply With Quote
Old 03-25-2013, 03:53 PM   #16
Iam Broke
PHAT B33
 
Iam Broke's Avatar
 
Drives: 2012 TF3 Camaro 2SS/RS M6
Join Date: Jun 2012
Location: Dark of the Moon
Posts: 1,437
On my '02 WS6 the post HFC reading was ~0.1 AFR leaner at WOT. At cruise (stoich) they were equal. Not enough to worry about. Only place I had to put the sensor in, no room pre cat on that setup for a second bung on the DS. Same tune same day with the same sensor replacing the pre and then post cat one in SD mode. YMMV.
__________________
Another 1 of 371 '12 T3 LS3 M6's built.

Last edited by Iam Broke; 03-25-2013 at 04:13 PM.
Iam Broke is offline   Reply With Quote
Old 03-25-2013, 04:44 PM   #17
JANNETTYRACING
PRESIDENT CALIBRATOR JRE

 
JANNETTYRACING's Avatar
 
Drives: YELLOW 2013 ZL1 AUTO
Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 10,854
Quote:
Originally Posted by newb View Post
I am not sure why its so important to go in before the cats? On the dyno. The probe is inserted at the tail pipe. Obviously well after the cats. Why can't the now useless post cat bungs be used? Since the secondaries are tuned out... Hopefully someone can help answer my question


Sent from my iPad using Tapatalk HD
Cats will burn some of the left over Oxygen and there are always exhaust leaks along exhaust systems that will be picked up by a tail pipe sensor.

We only use a Tail Pipe sensor as a Last resort to Measure AFR.

Ted.
__________________
Technical information, Parts Sales, Professional Installation, and Custom Dyno Tuning.
Please vist our web sites for all your performance needs!
Ted Jannetty
Jannetty Racing Ent Inc.
2984 East Main St.
Waterbury Ct. 06705
203-753-7223
tedj@jannettyracing.com
www.jannettyracing.com
www.turboaddictionparts.com
Performance Parts
JANNETTYRACING is online now   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 12:01 PM.


Powered by vBulletin® Version 3.8.9 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.