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View Full Version : plx m-300 wideband question?

94z6ex
06-03-2007, 09:30 PM
http://cgi.ebay.com/ebaymotors/PLX-M-300-Wideband-O2-Controller-w-Sensor-and-Display_W0QQcmdZViewItemQQcategoryZ107063QQihZ019Q QitemZ290113721973QQrdZ1QQsspagenameZWD1V

I know it says that it will run into the ecu as a narrowband and take the place of the factory sensor readings. But, i want to verify to make sure im understanding it correctly.

The sensor will plug into the o2 bung.......the narrow band and wideband selection can both be used at the same time correct? I want to be able to get a digital readout from the gauge provided with the unit in wideband mode, and i also want the ecu to recieve the narrowband mode so i can run in closed loop. And i want to make sure that these can both happen at the same time..

i dont want the m-300 to only be able to give me the afr readout through the digital display in the wideband mode but not be able to give the ecu the narrowband reading.....and vise versa.

thanks
inh
06-03-2007, 09:35 PM
I think thats how it works.. 99% sure..

I bought this (http://cgi.ebay.com/ebaymotors/Innovate-XD-16-Wideband-O2-Standalone-Gauge-Kit-LC-1_W0QQitemZ220118411534QQihZ012QQcategoryZ43989QQr dZ1QQcmdZViewItem) and could not be any happier with it. It's a bit more expensive, but the guage and the wideband are totally programmable from a computer. It's awesome man. i would spend the extra $70 and get that
CrazyConscious
06-03-2007, 09:35 PM
Yes you can do it exactly how you are thinking. I dont even use the narrow band output though...My car is tuned and thats just the way it is. The stock o2 is disabled in my s300 so I dont have to worry about it. I've always heard this was the best way of doing things anyway...
94z6ex
06-03-2007, 09:45 PM
I think thats how it works.. 99% sure..

I bought this (http://cgi.ebay.com/ebaymotors/Innovate-XD-16-Wideband-O2-Standalone-Gauge-Kit-LC-1_W0QQitemZ220118411534QQihZ012QQcategoryZ43989QQr dZ1QQcmdZViewItem) and could not be any happier with it. It's a bit more expensive, but the guage and the wideband are totally programmable from a computer. It's awesome man. i would spend the extra $70 and get that

Looks like a nice kit.....i really like the lc-1's. not sure what the difference is in the lc-1 and the lm-1, but i was really wanting just the square digital readout that i could mount on my steering column....i think it will look better with my current setup.

Has anyone heard or had any negative things about the plx m-300 or is it a pretty solid and accurate unit?

Yes you can do it exactly how you are thinking. I dont even use the narrow band output though...My car is tuned and thats just the way it is. The stock o2 is disabled in my s300 so I dont have to worry about it. I've always heard this was the best way of doing things anyway...

so your just running open loop and calling it a day? Im doing that cureently and not having any problems what so ever so i might just stay like that.......
but thanks for the input on what i was needing to know.
CrazyConscious
06-03-2007, 10:01 PM
so your just running open loop and calling it a day? Im doing that cureently and not having any problems what so ever so i might just stay like that.......
but thanks for the input on what i was needing to know.

Yea, no problems whatsoever...climate change doesn't affect it either...I live in MI so we've got plenty of it too...
SOHCinWA
06-03-2007, 10:04 PM
Not sure how that works but I am sure its the same as my Innovative LM-1 wideband. I love the fact that I can download my runs on my computer. Retail on the LM-1 is $349.00 PM me for a D-series price...
Don
94z6ex
06-03-2007, 10:12 PM
ive got crome pro with datalogging and will have an ostrich as well....i dont really need the wideband to have datlogging readouts i dont believe.....i am looking to spend $300 max on a wideband that has narrowband as well and gauge.
mikeD16Z6
06-03-2007, 10:16 PM
yep it should be fine. I'd mount the sensor as far away from the turbine as possible. The sensors dont like heat. Mine's about 4 inches before the cat.

Yeah, I run in open loop all the time too. The AFRs change a bit. With my tune it seems to run richer in the winter, not by much though. Weird I know, it should be the opposite.

I really like the unit because its compact and I can mount it right below the gauges on my pillar pods. Once I had to replace the sensor because I bottomed out and just kept reading 14.7. You can get replacment sensors from VW for less than PLX sells them for.
PianoMan
06-05-2007, 02:07 PM
Yes, you can wire narrow/wideband on the PLX sensors simultaneously.

I've got the SM-AFR (but haven't installed it yet). Will post once I get it in.

PM
ryan89crx
06-05-2007, 02:09 PM
Yeah, I run in open loop all the time too.+1 :wink:

the M300 will work just as you described in the first post :TU:
miro_gt
06-08-2007, 10:00 AM
running open loop all the time is just stupid ... cause you already have a narrow band oxigen sensor that works perfect for driving in vacuum at 14.7 A/F (either the stock one, or the one from the wideband)

putting your wideband sensor on the stock O2 sensor location is not very smart either, cause the exhaust temperatures rise with turbo, and that shortens the wideband sensor's life.

having a digital gauge for the wideband is a very good idea .. I have one and I love it.

good luck
ryan89crx
06-08-2007, 10:07 AM
running open loop all the time is just stupid ... cause you already have a narrow band oxigen sensor that works perfect for driving in vacuum at 14.7 A/F (either the stock one, or the one from the wideband)i still manage 30+mpg around town in open loop, good enough for me...
94z6ex
06-08-2007, 10:11 AM
i still manage 30+mpg around town in open loop, good enough for me...

im running open loop currently and managing 31mpg....

hey ryan, what do you have your partial throttle afrs at? WOT afrs as well?

mine are at 13.5:1 partial and a steady 12.5 at WOT....
ryan89crx
06-08-2007, 10:13 AM
im running open loop currently and managing 31mpg....

hey ryan, what do you have your partial throttle afrs at? WOT afrs as well?

mine are at 13.5:1 partial and a steady 12.5 at WOT....i run mine a bit lean when there isnt much load on the motor. cruising around town im about 14.5-14.7. highway is in the high 13s

WOT i run about 11.5-11.8
Richie_A_19
06-08-2007, 10:14 AM
So the car running the exact way you want the car to run at all times is dumber than having the ECU trying to lean it out during times that you hit boost at part throttle? :hammer:
miro_gt
06-08-2007, 10:16 AM
i still manage 30+mpg around town in open loop, good enough for me...

it's not about MPG, it's about steady A/F when the weather changes
ryan89crx
06-08-2007, 10:19 AM
it's not about MPG, it's about steady A/F when the weather changesweather change? i only drive mine about 6 months out of the year, so i dont worry about that. i have a truck and a jeep for the winter or when the weather is shitty
mikeD16Z6
06-08-2007, 11:16 AM
you hit boost at part throttle? :hammer:


exactly
94z6ex
06-08-2007, 11:35 AM
are my afrs to lean at WOT? too rich at partial?

thanks
shifty35
06-08-2007, 11:44 AM
So the car running the exact way you want the car to run at all times is dumber than having the ECU trying to lean it out during times that you hit boost at part throttle? :hammer:

... ECU won't touch maps in boost. Closed loop only operates under low load, which is definitively, not boost.

My boosted EJ1 got 33-35 mpg around town, and I used closed loop. And it's been running almost 3 years at 15 psi, and compression tests as good as the day I put it on.

Closed loop + LTFT FTW...
mikeD16Z6
06-08-2007, 12:22 PM
it's not about MPG, it's about steady A/F when the weather changes

IAT sensor compensates for this
shifty35
06-08-2007, 12:24 PM
IAT sensor compensates for this

IAT, atmospheric pressure sensor... all these things help compensate for weather and altitude. Combined with closed loop response, the ECU keeps idle and cruising A/F excellent, assuming the maps are close enough to start with. Closed loop can only adjust the maps within a certain % before it gives up.
miro_gt
06-12-2007, 03:42 PM
IAT sensor compensates for this


however, that's not the case in the real life.

if it was true, then nobody would run oxygen sensors to begin with.

I run IAT compensation, water temperature compensation, and gear compensation, and all those still cant make the A/F as good as running closed loop
mikeD16Z6
06-12-2007, 04:29 PM
I guess it depends on how anal you want to get with your vacuum maps. Yes, using the oxygen sensor cleans up the AFR perfectly, but my car has been running fine for the past 3 years with out one. Gas milage is still pretty good too.
RandysSOHC
06-12-2007, 04:41 PM
I guess it depends on how anal you want to get with your vacuum maps. Yes, using the oxygen sensor cleans up the AFR perfectly, but my car has been running fine for the past 3 years with out one. Gas milage is still pretty good too.

see,
not to get another subject goin' but I heard that to place the wideband about 12 inches from the turbo,
but I think I'll go with what your doing,
placing it right before the flex/converter

3 years is good enough for me to take that step

edit: 12-18 inches
mikeD16Z6
06-12-2007, 05:17 PM
edit: 12-18 inches


correct. mine is ~4" from the cat
94z6ex
06-13-2007, 09:43 AM
see,
not to get another subject goin' but I heard that to place the wideband about 12 inches from the turbo,
but I think I'll go with what your doing,
placing it right before the flex/converter

3 years is good enough for me to take that step

edit: 12-18 inches

i had mine about 14" from the turbo.......wideband sensor got too hot and we had to stop tuning for the night.

i now have it between mhy firewall and oil pan.....work great :TU: