Sinister95Z

I am just trying to make sure that I am getting the most accurate reading possible from my autometer air/fuel ratio guage. Where is the best place to splice into the harness now that I have O2 extensions and long tubes? Should I splice as close to the PCM as possible or should I try and get it close to the actual sensor? Before or after the extension? If anyone doesn't know, my car is a 95 LT1 Z28.

FORCE_FED_Z

It shouldn't matter- once the sensor converts to a electronic signal it will be the same whether you are spliced right off the sensor or right before the PCM.

I wouldn't really use the sensor for any type of tuning, they aren't completely accurate and jump around too much to be reliable.

To have one that you can trust you need to get a wide-band, but those cost some $$.

NoRiceInside

like joe said, it doesnt matter, there shouldnt be any voltage drop from the sensor to the pcm.

and since you brought them up joe, what is the difference between a regular A/F gauge and a wideband gauge?

archemedes

from what I have been seeing, the only purpose for any of those is to have another gauge

FORCE_FED_Z

Your stock O2 sensor is trying to maintain a 14.7:1 ratio and only works with rich or lean conditions, it will either try and add fuel or take fuel out. It only samples every 50 miliseconds which sounds quick, but it isn't constantly monitoring. A wide-band constantly monitors, uses a 6-wire hook-up, and will actually monitor the mixture more closely and accurately making adjustments faster than a typical o2 sensor.

Unfortunetely, you need an engine management system that is set-up to use a wide-band, its not something you can just add on.

NoRiceInside

oh so its an entirely new sensor and everything. ok.

69z-28

yea wideband is really unnecesary except for more wild setups with lots of boost usually or huge motor modifications. but damn those widebands are around 500 bucks or so.

FORCE_FED_Z

A wideband isn't necessary for most people, but those A/F gauges aren't really much good other than some lights dancing around-

69z-28

haha, good point. they are fun to watch if your on a long trip i suppose.lol

archemedes

isn't that what I said
lol

NoRiceInside

when it comes to A/F gauges i like the digital LED ones with 0-1 volt sweep. they display the voltage in the line, and for those who know how engine electronics work, can actually be more useful. it also looks cooler cuz people think you know a ******** cuz lazy people like rich/stoich/lean.

FORCE_FED_Z

In other such words yes..haha

archemedes

just checking