How to read a wideband

[LotsAHotAir]

I'm looking to buy either a LC-1 or a PLX SM-AFR to use with a Maftpro.
Neither have a guage, which I won't need with the car.

However, I would like to use the wideband occasionally on my ATV.

Can you read the wideband controller using a common voltmeter instead of a guage?

Thanks.

 

[rfpowerdude]

Yes, the analog output of the PLX Devices one is directly readable if you put a digital multimeter on it. There is a graph of the output voltage vs. A/F ratio on their website. Here it is for convenience:

It's nice that it is such an easy and linear equation A/F = 2*V + 10. You could just put that in Excel and get a table of values...

I have their SM-AFR new in the box on the desk next to me. I also have the DM-5 display as I will be using this in my EFI'ed big block setup...

 

[pacecarta]

lc-1 has two programamble analog outputs
from factory:
one output to a replicate a std narrowband O2 sensor , 0-1v switching quickly across at 450mv , the other as a linear 0-2v output , the 0-2v output can be read directly with a digital volt meter and be read for what it is , 1.00v =10.0:1 AF ratio

for the maftpro you would need to program one of the outputs to 0-5v

although a bit pricey for a gauge , i went with the innovate XD-16 gauge , you still retain two outputs for logging and have an easy to read digital wideband gauge complete with reset button, led indicator ,heater warmup display and error status display

for ease of instal the plx-is probably the way to go but for flexibility and accuracy for the life of the sensor the lc1 wins out

 

[TurboDave]

lc-1 has two programamble analog outputs
from factory:
one output to a replicate a std narrowband O2 sensor , 0-1v switching quickly across at 450mv , the other as a linear 0-2v output , the 0-2v output can be read directly with a digital volt meter and be read for what it is , 1.00v =10.0:1 AF ratio

for the maftpro you would need to program one of the outputs to 0-5v

although a bit pricey for a gauge , i went with the innovate XD-16 gauge , you still retain two outputs for logging and have an easy to read digital wideband gauge complete with reset button, led indicator ,heater warmup display and error status display

for ease of instal the plx-is probably the way to go but for flexibility and accuracy for the life of the sensor the lc1 wins out

Umm, correct me if I'm wrong but the LC1's outputs are 0-1v for a narrow band simulator (or I think, can be reprogrammed to 0-5v wideband),
and the wideband output is supposed to be 0-5v for the wideband output.
I suppose the wideband output can be reprogrammed to someother output voltage, but why?

Why would you program it to be 0-2v?

As for life of sensor, they're both the same, both use LSU4.2 sensors.

 

[pacecarta]

Umm, correct me if I'm wrong but the LC1's outputs are 0-1v for a narrow band simulator (or I think, can be reprogrammed to 0-5v wideband),
and the wideband output is supposed to be 0-5v for the wideband output.
I suppose the wideband output can be reprogrammed to someother output voltage, but why?

Why would you program it to be 0-2v?

1-2v to be readable with a std voltmeter gauge

2v=20:1 , 1v =10:1 and so on anywhere inbetween

 

[pacecarta]

my bad , you are correct dave
got mixed up

the lm-1 is set that way (i run that unit for years before getting the LC-1)

the lc1 has one at narrowband simulate and one at 0-5v but either output could be reprogrammed for the output for a voltmeter