Wideband, stock o2, questions

[jaywood]

Hi. Got a wideband o2 sensor. Need some wiring help. Here's what I know (correct me if I'm wrong)


Stock o2 connectorfdfdfdfdfdfd LC-1 wires

Yellow --------------------------- White
Black ---------------------------- Brown (bold because the brown wire is for analog 2, narrowband. analog 1 is defaulted for wideband signal.)
Brown --------------------------- Blue
Green/blue ---------------------- Red


How does that look?


Also, how would I wire it in? Do I need certain "plugs" to go into the harness, or could I just snip the wires and solder them in? Do I keep the stock o2 plugged in (at the harness) and snip the wires on that? Or how does that work...?

Thanks guys!

[einstein57]

I wired mine up independentally but that was overkill. The easiest way is to take an old O2 sensor and snip it to use the harness. That way you can easilly make changes in the future.

[MC Hammered]

You are supposed to weld in a bung and use a separate o2 sensor and leave the stock o2 sensor in the car alone.

Your LC-1 should have come with its own 02 sensor in the package.

[jaywood]

As far as I know, there is no point in keeping the stock o2 sensor in the bung when you have a wideband taking it's place. The wideband can send the ecu a narrowband signal. That's what the brown wire is for.

[einstein57]

That's one of the things I like about the LC-1 over the UEGO. Oem sensors are way overpriced on the e30.

[Jaxx_]

You are supposed to weld in a bung and use a separate o2 sensor and leave the stock o2 sensor in the car alone.

Stupid.


your wideband controller should be able to output a narrowband signal to the ECU. Use the factory bung.

[MC Hammered]

I didn't know that the e30 used a narrowband input.

My suggstion came from my experience with audi setups where you can't use the stock o2 as the ecu will throw a code.

[Jaxx_]

I didn't know that the e30 used a narrowband input

very few select cars have wideband inputs. you'd better believe that a stone age EFI system from the 80s doesn't. Yes, VAG cars can sometimes feature OEM widebands. So do some Nissans. And if I recall correctly, new fords.

If you're going to speak up please make sure you have correct info, otherwise we get stupid threads that amount to about 50% of the posts on r3v.

[MC Hammered]

Thanks for the slap on the face for trying to assist. As I stated, my post was borne from my knowledge of selling and installing LC-1's in a VAG vehicle.

I will make sure to have my info certified by an e30 guru before posting up any relevant information next time.

[jaywood]

No need to be arguing guys. If I want to keep the stock o2 in there I could. That could be my narrowband signal and the wideband wouldn't hook up to the narrowband output thingy. There would be a free wire.

Thanks for the help so far guys, just need a little clarifying on my wiring diagram.

[EthirtyIS]

hey, jay did you get your wideband 02 working with your motronic

[jaywood]

Sort of. I ended up not using the power/ground/ground from the stock o2 sensor harness. I was getting readings of 19 afr at idle so I figured there was something wrong with the wiring. I ended up using a switched +12v for the power (right next to the fuse box) and a shock tower bolt for the 2 grounds. It now works as it should. Keep in mind, I still have the yellow wire coming out of the wideband controller hooked up to the motronic (black wire in the stock o2 harness, o2 side)

[e30newbie1212]

All of my research into this, including reading the manual PDF from Innovative (which talks about this) has been for the MTX-L Wideband Controller. But it is easily possible to simulate the stock using analog 2 output from the controller. The programmable limits of the analog outputs is 0v -5v, which is customizable by you. This is perfect for us since narrow band is 0v to 1.0v. From Innovative, in stock form, the analog output 2 is 0.1v to 1.1v, with 0.1v equaling 14:1 AFR, and 1.1v equaling 15:1 AFR. I will be receiving my MTX-L tomorrow, and will be using the analog 2 output stock at first, and if there is issues I will go into the supplied software and adjust output values as needed to get the AFR looking good. I hope that helps some, if anything is wrong I apologize as I am no expert.

[EthirtyIS]

mines working but my gauge took a crap, i wired it in according to the pdf file, and spliced the yellow (lc1) to the black on the sensor side of the o2 connector, then grounded the white's coming off the sensor side of the o2 connector. that worked out well for me, the gauge was reading between 14.5-14.8 at idle, then under 5psi at 3800 rpm it hovers around 15.1, then when shifting to the next gear, it will jump to 17-19 then drop back down to 13-14 then go back up under boost.
that just about were it should be, id like to get that boost afr down, but its not bad for ebay chipped motronic, an fmu and a turbo set up.

[einstein57]

Sounds kinda lean sir. 14-15 afr readings under load are lean even for NA.