PM-Performance

I just got my PLX M300 today . I just wanna make sure i get this all right.
this is how it comes



now if im correct i just take out the stock o2 sensor and leave the plug in the engine bay if i ever wanna switch back to stock . This cable comes with a whole new harness that will run thr the firewall.
Now for the ground it says to keep it close to the ECU. can i just tap right into the ECU ground on ther harness? Also for the power? or should i take power from a diff source? if im correct the ECU should have a switched 12v?

also whats the deal mwith the wideband/narrow band outputs? i dont quite get that part?

any information would be greatly appreciated. thanks.

b18bturbo

narroband goes back to your autometer guage or whatever that needa narrowband output. wideband out put can be datalogged if you cna read the voltages that are coming out of it. that is the purpose of both those outputs

PM-Performance

if im reading the a/f on the PLX display and datalogging it on the Hondata. Do i really need to mess with these wires? Like how does it interface to the Hondata if its not really plugged into the harness in anyway. Like not using the stock o2 plug?

PM-Performance

OK i think i got it .

PM-Performance

Now in this pic i can see where the wideband signal gets its source. But i was told off line i need to also use the narrowband to get a signal becuase i unplugged my stock 02? any insight on this?

IN VTEC

iTrader: (3)

Remove your stock narrowband oxygen sensor from the exhaust. Without a heater on it, it'll foul the sensor.

Set the Hondata to run in open loop.

Output the 0-5V wideband output from the wideband controller to the stock o2 input signal wire (as shown in diagram).

If the wideband controller has a narrowband (0-1V) and wideband (0-5V) outputs, then you may want to try wiring it up so you can flip flop the system b/w narrowband/closed loop and wideband/open loop.

Altho, I think the Hondata unit might be able to run closed-loop with wideband input as well, so that you don't have to switch over to a narrowband input. I don't know for sure tho (somebody? anybody?). I only know that if you were to do that, you'd have to reset the target voltage to whatever lambda =1 is....probably around 2.25V on the wideband.

PM-Performance

i got about that far as the wideband with open and narrow with closed.
I was gonna do a switch or something , but it kinda defeats the purpose of having a wideband in the car.

also with Hondata we were told its best to run closed loop under 650mbar and above that set it to automatically switch to open loop . i think that might be where im leaning at this point, but not sure if they would both get the same signal if how it knows to flop over from narrow to wide. or if i can just keep it in wideband set up and Let Hondata do its thing in both open and closed loop.

IN VTEC

iTrader: (3)

You're starting to confuse me now.

If you're running open loop all the time, then you don't need to worry about the closed to open loop transition. You tune according to the target AFR's (stoich for closed loop and whatever the engine needs/likes for open loop) and that's it. Am I missing something here?

When you're tuning the engine, you leave it in open loop to keep the o2 sensor input from affecting the overall fuel trim.

PM-Performance

well i was stating that if it isnt ok to keep it in open loop all the time i could put it in closed loop and set it to automatically switch to open loop at a set mbar..that way the partial throttles can be affected by the 02 and amke the corrections it would need to in closed loop , then at that set number have it kick over to open loop to read the target lamda i tuned for. Hondata sugested this before/.I hope igot the right idea

dabrown

I am considering purchasing this wideband, however does anyone know if a lighter adapter can be rigged for the power source? I will be using this kit in various cars and would love an easier way to get power without taping into wires each time. Thanks

slim9300

Yeah, I could use some more info on the cigarette adaptor power source. I have the unit and I was thinking about doing this.

slim9300

Hey you bought the NB to WB converter too. I thought that you weren't going to... Good call, it won't be as bright as that red digital display in your face all the time.

dabrown

Actually I should probably rephrase the question. What voltage does the cig lighter put out?

PH_B16-VTi

This is one way to do it.

1: Remove your stock O2 sensor, and insert your wideband sensor.

2: Run the cables from your wideband sensor through the firewall and in to the PLX controller.

3: Find power, ground and O2 Signal Input from ecu harness.

4: Take red wire (power) and connect to power on harness.

5: Take black wire (ground) and connect to ground on harness.

6: Take white and grey wire and connect to a switch and then to the O2 Signal Input on harness.

Now when you tune your car you can switch to wideband (switch) and open loop (ecu). Then the ecu will get that signal. And when your done tuning you set ecu to close loop under 650 mbar and switch back to narrowband, and the ecu will use that signal when crusing like stock.
You on the other hand will allways see wideband info besauce the PLX controller has the display.

And another way is only to use white wire (Wideband) and adjust the target lambda in hondata.

hope this helps.

/PH

Mr_Bojangles

If I understood correctly (and this is not for hondata, that I do not know),

You leave the stock o2 sensor alone, drill a new hole to install the o2 sensor that comes with the plx device.

Connect the plx supplied o2 to the display unit.

Ground the black wire, connect the red to a 12v, done...

nice and easy... The grey and white wires are for other devices like the autometer gauge, or datalogging or I think ems/hondata/etc.

Correct me if I am wrong...

Chris

V-SPEC 1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dabrown &raquo;</TD></TR><TR><TD CLASS="quote">I am considering purchasing this wideband, however does anyone know if a lighter adapter can be rigged for the power source? I will be using this kit in various cars and would love an easier way to get power without taping into wires each time. Thanks
</TD></TR></TABLE>

the cigarette adapter is not a good idea for getting power source. I think it only puts out around 12 volts sometimes less. You need to find a source where 14 volts or higher can be achieved. Like directly to battery.

elpiar

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by V-SPEC 1 &raquo;</TD></TR><TR><TD CLASS="quote">the cigarette adapter is not a good idea for getting power source. I think it only puts out around 12 volts sometimes less. You need to find a source where 14 volts or higher can be achieved. Like directly to battery.</TD></TR></TABLE>

Waking thread up from the dead. Not too much plx install thread out there.

So can I or can I not tap off 12v switched power and ground from ECU? Is this good enough? ANyone knows the which wire this is on P72? I read the ECU thread, couldn't figure out which one..
With this, should I install the capacitor?

Enzo Speed

Here is how I installed mine:

1. Unplug and remove your factory o2 sensor (pre-cat).

2. Plug in the PLX sensor.

3. Find where your primary o2 sensor feeds into the ECU (pin D14 on a P28) and cut it about 6" from the harness. Strip the end that goes into the ECU.

4. Unplug the two wires/spade connectors from your cigarette lighter (requires you to undo part of the dash).

5. Run a fused wire from the 12v+ battery terminal to your interior.

6. Run an unfused wire from the 12v- battery terminal to your interior.

7. Buy a radioshack "12v Auto relay"

8. Connect the four wires to the relay.

9. Connect the two PLX output wires (white and grey) to a switch.

10. Connect the switch to the ECU o2 sensor input (e.g. D14).


Diagram:




When you are tuning, flip the switch so that the wideband signal is going into the ECU. That is so you can datalog. If you are not datalogging, flip the switch so that the narrowband signal is going into the ECU. Keep in mind that when you are feeding the wideband signal into the ECU, closed loop mode won't work.

elpiar

That's very informative. THanks!

Enzo Speed

That's the best way to install it. To answer your question, I was unable to tap into my ECU's power and use that as a 12v source. I tried and ran into problems with my PLX displaying "00.00"

I don't know why that happened, but I'm not going to mess around anymore tapping into my ECU harness. The method I listed is very accurate because the ECU and PLX both have a reference ground coming straight from the battery negative.

As for the capacitors, I didn't install mine, but I will eventually when I get around to it

elpiar

Does cigarette lighter socket has more noise for the voltage supply? hence bringging more noise into the measurement?

Any other opinion?

PM-Performance

everyone was making it alot harder then it was when I made this thread.

I took the power and ground right to the ECU and ran the Wideband Sim wire to the stock Wideband output I believe and put in the resistors and cap and that was that

I now run another M300 on the Supra as a secondary 02 for the wideband and just power and ground and good to go.

EnzoSpeed

Maybe my diagram is too confusing, but what it shows is the PLX getting power and ground directly from the battery. The cigarette lighter signal turns the relay on and lets power flow to the PLX.

And yes, the cigarette lighter signal won't be very clean. I wouldn't use it as the power source, just the relay source.

PM-Performance

Why use a relay?Why not keep it on all the time?
I keep mine in my cars for everday use. . . . well everyday I drive them.
They are permanent and stay on when the car is on.

DaveF

pete, is there an inline connector that comes with the WBO2? or does it just get hardwired in?