A/F Calculation using SCT Data Logging
01-18-2008, 09:38 AM
#1
2nd Gear Member
Thread Starter
Join Date: May 2007
Location: Sunny Side of Louisville
Posts: 488
A/F Calculation using SCT Data Logging
Happy Friday!
I'm interested in figuring out what my A/F ratio is by utilizing the SCT's data logger - I believe that this can be done. After looking at the properties that I can log with the device, I have a basic understanding of the general "areas" that I want to monitor, but that's about it. I was wondering if anyone on here as done this before and (assuming that it actually IS doable), can tell me what properties I need to log and what, if any, calculations need to be performed on those properties.
Thanks!
I'm interested in figuring out what my A/F ratio is by utilizing the SCT's data logger - I believe that this can be done. After looking at the properties that I can log with the device, I have a basic understanding of the general "areas" that I want to monitor, but that's about it. I was wondering if anyone on here as done this before and (assuming that it actually IS doable), can tell me what properties I need to log and what, if any, calculations need to be performed on those properties.
Thanks!
01-18-2008, 09:56 AM
#3
5th Gear Member
Join Date: Sep 2006
Posts: 3,401
RE: A/F Calculation using SCT Data Logging
I notice the stock O2 sensor info tends to be a bit bouncy during steady running but under hard throttle it steadies out and give solid readings.
I'm a bit fuzzy about what the Wide Band system offers, I believe it has finer graduations of translation but the stockers should be able to read a decent range between lean and rich so.............
Saying you can't trust a stock sensor is garbage. If the sensor wasn't doing it's jobthe car would run like A$$
I do know that an O2 output of 850mv = an A/F of 11.5
Some good info here:
http://www.unofficialbmw.com/all/eng..._o2sensor.html
I'm a bit fuzzy about what the Wide Band system offers, I believe it has finer graduations of translation but the stockers should be able to read a decent range between lean and rich so.............
Saying you can't trust a stock sensor is garbage. If the sensor wasn't doing it's jobthe car would run like A$$
I do know that an O2 output of 850mv = an A/F of 11.5
Some good info here:
http://www.unofficialbmw.com/all/eng..._o2sensor.html
01-18-2008, 10:02 AM
#4
Banned
Join Date: Dec 2007
Location:
Posts: 90
RE: A/F Calculation using SCT Data Logging
ORIGINAL: marcuskeeler
I notice the stock O2 sensor info tends to be a bit bouncy during steady running but under hard throttle it steadies out and give solid readings.
I'm a bit fuzzy about what the Wide Band system offers, I believe it has finer graduations of translation but the stockers should be able to read a decent range between lean and rich so.............
Saying you can't trust a stock sensor is garbage. If the sensor wasn't doing it's jobthe car would run like A$$
I do know that an O2 output of 850mv = an A/F of 11.5
Some good info here:
http://www.unofficialbmw.com/all/eng..._o2sensor.html
I notice the stock O2 sensor info tends to be a bit bouncy during steady running but under hard throttle it steadies out and give solid readings.
I'm a bit fuzzy about what the Wide Band system offers, I believe it has finer graduations of translation but the stockers should be able to read a decent range between lean and rich so.............
Saying you can't trust a stock sensor is garbage. If the sensor wasn't doing it's jobthe car would run like A$$
I do know that an O2 output of 850mv = an A/F of 11.5
Some good info here:
http://www.unofficialbmw.com/all/eng..._o2sensor.html
Some better info on the differences between a wide band and narrow band here:
http://www.gmtcny.com/WBO2S.htm
01-19-2008, 07:42 AM
#7
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
RE: A/F Calculation using SCT Data Logging
ORIGINAL: GrayPony
Install a wideband, connect the analog output of the widebandtoyour SCT via their cable end and log A/F with your SCT. You can find the cable end on the SCT website.
Install a wideband, connect the analog output of the widebandtoyour SCT via their cable end and log A/F with your SCT. You can find the cable end on the SCT website.
The SCT has an input for WideBand A/F.
01-19-2008, 09:26 AM
#8
Banned
Join Date: Apr 2006
Location: Goodyear, AZ
Posts: 1,631
RE: A/F Calculation using SCT Data Logging
ORIGINAL: marcuskeeler
I notice the stock O2 sensor info tends to be a bit bouncy during steady running but under hard throttle it steadies out and give solid readings.
I'm a bit fuzzy about what the Wide Band system offers, I believe it has finer graduations of translation but the stockers should be able to read a decent range between lean and rich so.............
Saying you can't trust a stock sensor is garbage. If the sensor wasn't doing it's jobthe car would run like A$$
I do know that an O2 output of 850mv = an A/F of 11.5
Some good info here:
http://www.unofficialbmw.com/all/eng..._o2sensor.html
I notice the stock O2 sensor info tends to be a bit bouncy during steady running but under hard throttle it steadies out and give solid readings.
I'm a bit fuzzy about what the Wide Band system offers, I believe it has finer graduations of translation but the stockers should be able to read a decent range between lean and rich so.............
Saying you can't trust a stock sensor is garbage. If the sensor wasn't doing it's jobthe car would run like A$$
I do know that an O2 output of 850mv = an A/F of 11.5
Some good info here:
http://www.unofficialbmw.com/all/eng..._o2sensor.html
Casey
01-19-2008, 09:31 AM
#9
4th Gear Member
Join Date: Jan 2007
Location: Minnesota
Posts: 1,292
RE: A/F Calculation using SCT Data Logging
I have a question relatingto this topic.
My O2 sensors are turned off in my tune. Does this mean they are not actually reading anything, or that the tune just makes it so the CEL doesn't come on (O/R pipe...).
[/align]
My O2 sensors are turned off in my tune. Does this mean they are not actually reading anything, or that the tune just makes it so the CEL doesn't come on (O/R pipe...).
[/align]
01-19-2008, 09:51 AM
#10
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
RE: A/F Calculation using SCT Data Logging
ORIGINAL: sailing220
I have a question relatingto this topic.
My O2 sensors are turned off in my tune. Does this mean they are not actually reading anything, or that the tune just makes it so the CEL doesn't come on (O/R pipe...).
[/align]
I have a question relatingto this topic.
My O2 sensors are turned off in my tune. Does this mean they are not actually reading anything, or that the tune just makes it so the CEL doesn't come on (O/R pipe...).
[/align]