a/f gauge help
#3
Junior Member
Posts like a Ricer Type-R
The purple wire.
But I'd like to mention also that it'* a waste of time. A narrow-band O2 and AFR gauge won't do you any good other than dressing up the cockpit. Zero benefit.
But I'd like to mention also that it'* a waste of time. A narrow-band O2 and AFR gauge won't do you any good other than dressing up the cockpit. Zero benefit.
#4
Originally Posted by willwren
The purple wire.
But I'd like to mention also that it'* a waste of time. A narrow-band O2 and AFR gauge won't do you any good other than dressing up the cockpit. Zero benefit.
But I'd like to mention also that it'* a waste of time. A narrow-band O2 and AFR gauge won't do you any good other than dressing up the cockpit. Zero benefit.
#5
Senior Member
True Car Nut
From another old thread...
Originally Posted by willwren
...Narrow band is the bare minimum the PCM needs to set AFR. If you're out of that very narrow band, you have no idea what the car is doing.
#6
Originally Posted by lash
From another old thread...
Originally Posted by willwren
...Narrow band is the bare minimum the PCM needs to set AFR. If you're out of that very narrow band, you have no idea what the car is doing.
#7
Junior Member
Posts like a Ricer Type-R
The narow band O2 is essentially that, it has a very narrow band of which it reads accurately. In fact, that range is so small it'* almost just a switch and can essentially be thought of that way. While not getting into detail about the inner workings of engine management systems, the narrow band O2 essentially tells the ECU either to add fuel or take away fuel depending on which side of the switch it'* on. Just where does that switch point happen to be, well, it'* at the 14.7:1 as mentioned above. While this does a good job of telling you if your car is running rich or lean, it doesn't accurately tell you how rich or how lean.
This is where the wideband O2 steps into the picture. It has a broad range of measurement and can accurately tell you where you are sitting air-fuel wise. Why is this such a good thing, well, in order for a car to make good, safe power you want to run it a little on the rich side of things. For example a typical turbo car will operate best running at an air-fuel ratio of approximately 12.3:1. On the narrowband O2 you'd have a hard time finding this point, but with use of a wideband O2 you can accurately read where you are. It'* the best way to get air-fuel ratios sorted out and you'd be surprised at the difference in power a properly tuned motor will have.
This is where the wideband O2 steps into the picture. It has a broad range of measurement and can accurately tell you where you are sitting air-fuel wise. Why is this such a good thing, well, in order for a car to make good, safe power you want to run it a little on the rich side of things. For example a typical turbo car will operate best running at an air-fuel ratio of approximately 12.3:1. On the narrowband O2 you'd have a hard time finding this point, but with use of a wideband O2 you can accurately read where you are. It'* the best way to get air-fuel ratios sorted out and you'd be surprised at the difference in power a properly tuned motor will have.
#8
Senior Member
True Car Nut
Now THAT really explains it, IMO.
I hope that we haven't taken Aaron'* question too far off topic, but I know it has helped explain this to some.
I hope that we haven't taken Aaron'* question too far off topic, but I know it has helped explain this to some.
#9
Junior Member
Posts like a Ricer Type-R
The off-topic was intentional on my part. I'd rather see someone spend their money on something useful. Alot of people misunderstand the aftermarket AFR gauges. And especially in a boosted application, this gauge can give a false sense of security, no useful data, and a potentially blown motor from data that it can't provide.
In order to determine proper tuning of AF curves or fuel pressure/injector selection, you MUST have wideband O2 data.
In order to determine proper tuning of AF curves or fuel pressure/injector selection, you MUST have wideband O2 data.
Thread
Thread Starter
Forum
Replies
Last Post