I was looking at the greddy electronic and mechanical A/F guages and I wanted to know how accurate they are compared to a wideband which is I think is +- .1.

MVP Motorsports website (Greddy guages)

 

As far as I've learned, regular A/F gauges are only accurate at WOT. You need a wideband 02 sensor and A/F gauge to accurately read your A/F ratio throughout the powerband.

 

Hypothetically, a carpenter could use an inexpensive measuring tool that, after a second or two delay, tells him the board he cut is either too short or too long. But it does not indicate the actual length of the board. That would be kind of like a narrow band A/F gauge.

The same carpenter could opt for an expensive measuring tool that instantly indicates the exact length of the board. That would be kind of like a wide band A/F gauge.

Given the choice of the two measuring tools described above, which would you prefer to use?

 

a nonwideband wont do you anygood.... you need a wideband otherwise your only reading like 13-15 AF... nothing more

 

Unless you get the narowband to wideband converter that PLX makes

http://www.plxdevices.com/NB_WB_GaugeConv.htm

 

I'm not sure I understand how that works. That converter is supposed to allow a narrow band gauge to interpret and display a wide band signal, I guess. But, it's not just the gauge that needs to interpret a wide-band signal. You would also need to install an aftermarket wide band O2 sensor, wouldn't you, so a wide band signal is sent in the first place...?

Help!

 

Correct. You need a wideband sensor and gage. If you intend to tune yourself, spend the money and due it right. New engines are expensive. A good gage will have a narrow band output so you can replace your regular O2 sensor.

 

As far as i know, our o2 sensors are already wideband. At least on the 2004.5 with the stricter emmision laws.

 

Your sig. would indicate that you have a 2004.5 vehicle. The pre-cat O2 sensors on 2004.5 and later vehicles ARE wideband sensors so you basically just need a gauge that taps of the signal feed.

 

So a wideband sensor can replace one of the first O2 sensors (before cats) and use the signal for the car and a wide guage?

Can one put the new '04.5 sensor in and use it in a '03 for the same purpose?

 

No, because the 2003 ECU isn't programmed to work with the information coming from the widebands.

 

I understand that, but could you put it in and connect the two standard wires to the ECU and all four wires to a wideband meter?