Ducman82

whats the benefit of a Wide band o2 sensor over the normal and cheaper style air/fuel gauges?

RKD in OKC

The air/fuel gauge just tell you if the car is rich or lean and fluctuates irradically.
Widebands give and actual Air Fuel Ratio reading and usually have a log you can download.
If you are tuning enough to look at the AFR you need the increased accuracy of a wideband.

Giovanni

Now I have the factory o2 sensor and an o2 gauge. Can I purchase a wideband o2 sensor and continue using the same gauge or do I need to get a widebank controller?

Ducman82

from what i read, you need a different sensor

dprantl

You need a wideband sensor, a wideband controller and a wideband-compatible gauge. A narrow-band gauge will not work with a wideband sensor.

Dan
'91 928GT S/C 475hp/460lb.ft

123quattro

Spot on.

blown 87

Whole new set up.

Giovanni

That cost a whole lot more money, no thanks, I can live with my current setup . I just tell my friends the AFR is a compact equilizer.

dprantl

I got the whole setup including a very nice gauge with 4 programmable views for ~$360. It's not that much, especially in an S/C car when you really want to know what is going on with AFR.

Dan
'91 928GT S/C 475hp/460lb.ft

RKD in OKC

With that boosted stuff ya never know when some bad gas might risk damage.

Lizard928

narrow band (stock) O2 sensors work on a 0-1V with 14.7:1 AFR (stoich) being .5V They are ONLY accurate at stoich.

Wideband sensors such as the bosch LMU4, require a wideband controller, or a computer (like VEMS) which you can then do a free air calibration of it every now and then to ensure its accuracy.
All wideband sensors/controllers work on 0-5V and are accurate from 9:1 AFR to 19:1 AFR (give or take a bit).

However all wideband controllers have narrowband outputs so that you can use them with stock computers and just have the WB signal going into a datalogger like the LM-1.
So YES you can use your narrowband AFR guage with a wideband controller. And it will be more accurate than with the normal narrowband, but not nearly as accurate as a proper WB guage.

928mac

Colin, as you know I have installed the EMC system.
How can I tell which O2 sensor I have.
On my ENC laptop dash the AFR seems to move from the high teens to the high 9s.

right now (still tuning) my Idle is around 13.5