A/F Ratio Gauges
03-01-2009, 04:18 PM
#1
Thread Starter
Join Date: Jul 2006
Posts: 38
A/F Ratio Gauges
Got a boost gauge and a fuel pressure gauge at the moment but I would like to add an A/F ratio gauge to keep an eye on things. Any suggestions?
What's the difference between wide-band and narrow band O2 sensors?
I've been looking at Autometer's wide-band gauges with the peak recall and warning light features. A tad expensive but I really like the features.
On a boosted application, what's a good A/F ratio? I know 14.7 is considered stoich for gas motors, but someone told me F/I applications run a little different. And to make sure I understand the numbering correctly, 12.5 would be leaner than say 14.7 correct??
Thanks,
bigmac
What's the difference between wide-band and narrow band O2 sensors?
I've been looking at Autometer's wide-band gauges with the peak recall and warning light features. A tad expensive but I really like the features.
On a boosted application, what's a good A/F ratio? I know 14.7 is considered stoich for gas motors, but someone told me F/I applications run a little different. And to make sure I understand the numbering correctly, 12.5 would be leaner than say 14.7 correct??
Thanks,
bigmac
03-01-2009, 05:41 PM
#2
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Got a boost gauge and a fuel pressure gauge at the moment but I would like to add an A/F ratio gauge to keep an eye on things. Any suggestions?
What's the difference between wide-band and narrow band O2 sensors?
I've been looking at Autometer's wide-band gauges with the peak recall and warning light features. A tad expensive but I really like the features.
On a boosted application, what's a good A/F ratio? I know 14.7 is considered stoich for gas motors, but someone told me F/I applications run a little different. And to make sure I understand the numbering correctly, 12.5 would be leaner than say 14.7 correct??
Thanks,
bigmac
What's the difference between wide-band and narrow band O2 sensors?
I've been looking at Autometer's wide-band gauges with the peak recall and warning light features. A tad expensive but I really like the features.
On a boosted application, what's a good A/F ratio? I know 14.7 is considered stoich for gas motors, but someone told me F/I applications run a little different. And to make sure I understand the numbering correctly, 12.5 would be leaner than say 14.7 correct??
Thanks,
bigmac
With respect to AFR is is true that "...14.7 is considered stoich for gas motors", mostly because it is the only stoichiometric AFR for gasoline fueled engines.
In closed loop mode you want 14.7:1 regardless of induction method, at WOT with an f/i setup you will want to be at 11.5:1 or so--which is richer than 14.7:1...
AFR is air/fuel ratio, therefore the first part of 12.5:1 (12.5) is the number of "parts" of air and the second part (1) is the number of parts of fuel. 14.7:1 is 14.7 parts of air and 1 part of fuel, so it's leaner (more air/less fuel) than 12.5:1 (12.5 parts air and 1 part fuel).
03-07-2009, 01:11 AM
#6
3rd Gear Member
Join Date: Apr 2007
Location: MA
Posts: 901
they know have this available http://www.dynotunenitrous.com/store...?idproduct=151 sorry to jack the thread but im trying to get a better understanding. does this allows you to tune your own vehicle via laptop or device?
03-07-2009, 06:34 AM
#7
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
they know have this available http://www.dynotunenitrous.com/store...?idproduct=151 sorry to jack the thread but im trying to get a better understanding. does this allows you to tune your own vehicle via laptop or device?
It is not a tuner, just a wideband O2 sensor control system.
03-07-2009, 01:44 PM
#8
6th Gear Member
Join Date: Mar 2007
Location: Chicago, IL
Posts: 6,169
Go with the AEM Wideband from lethal. I love mine!
http://www.lethalperformance.com/03-...roller-p-18348
http://www.lethalperformance.com/03-...roller-p-18348
