I bought an AFR meter, in expectation of my Greddy purchase.
I know how to splice into the O2 sensor to get the reading, but do I need to use the second, simple O2 sensor, or would it be better to tap the first/wideband one? Is it possible my meter could upset the readings to the ECU ?
Can someone with experience assist?

felix

 

Any tuning 'gurus' here?

Bump

S

 

you need a bung added to the exaust before the CAT...to which the WBO2 sensor is added.
You can't wire a "meter" to the stock sensors......You Can use a CanScan or ScanAlyser to get the data to a laptop

 

why can't you wire the meter to the stock 02 wires? I did with my autometer 02 on my 99 Eclipse GST. Had the meter recalibrated for a tighter range... can't remember the spec Voltage though. i think it was from 10V to 13V. wasn't the most accurate meter in the market but was a nice light show. :-)

 

I don't know if you can splice in another meter or not. But, I do know that if you did, it would need a high input impedance (like a megaOhm). Otherwise, you draw current from the sensor and change the voltage on the line. I deal with this issue on oscilloscopes all the time. You gotta be careful. Adding another device on the line can change the value of the voltage you are trying to read.

 

This is true with any air/fuel meter for any type of sensor on any car...they're all designed to tap the signal off the O2 sensor and therefore all have a very high input impedance.

The typical narrow band O2 sensors had a different output range than the wideband sensors...I can't remember but I think the narrowband sensors were 0-1V, and the wideband sensors were maybe 0-5V? However sensors have changed a bit since I paid that much attention to them, so I don't know if this is necessarily true anymore.

jds

 

WBO2 sensor on the 8..is current based not 0-5V like most meters....therefore won't work :D

 

Doh! :D