Narrowband to Wideband

[97gsxIA]

Ok I'm in desperate need to start tuning. I'm getting DSMlink in a month and a wideband is a necessity soooo..... I've read tons of information on installing widebands, but nothing concerning having a narrowband already installed. I bought this gsx from someone who obviously was oblivious to how these cars run and have been fixing his mistakes for the last year. He has a narrowband 'light show' gauge installed and I want to install this MTX-L WB. I have a 3"downpipe, and from what I can tell his narrowband is going to the stock O2 location (O2housing off turbo). My question is, should I splice into the same wire locations as his narrowband? Or what? I'm not sure where the wires were hooked up in the first place as I didnt install the narrowband. I can take pictures of his gauge and wiring setup if anyone would like.. I figured I'd post this first. I've got new injectors sitting next to me, a new e316g turbo in it already and im itching to get this bad boy boostin. Thanks guys.

 

[XiKeiyaZI]

A narrowband splices into the stock wiring of the Front 02 Sensor.

A Wideband is a completely different animal. It has it's own sensor which you must install into the Exhaust system. This sensor is wired into a controler/gauge. There is no need to splice into your front 02 sensor or do anything aside form hucking that narrowband into a lake. Remove the Narrowband and it's wiring. Make sure the wiring to the front 02 sensor is fine, and when you get the wideband kit ... follow it's instructions. Don't touch the front 02 unless you are doing narrowband simulations, which judging by your post, you will not be.

 

[97gsxIA]

Ok great. I guess im just not familiar with narrowbands. I didnt know if they went to the ECU for any reason or what. Time to go fishing with this kids gauge. You think itd make a good bobber? Oh and more thing. Does the Narrowband use a similar power source and ground? This is what I was kinda asking because I'll just use the same ones to get juice to the WB. I've used WB's before, but never had a narrowband as they are like we agreed on.... nothing but fishing lure.

 

[Tyeler18]

Ok great. I guess im just not familiar with narrowbands. I didnt know if they went to the ECU for any reason or what. Time to go fishing with this kids gauge. You think itd make a good bobber? Oh and more thing. Does the Narrowband use a similar power source and ground? This is what I was kinda asking because I'll just use the same ones to get juice to the WB. I've used WB's before, but never had a narrowband as they are like we agreed on.... nothing but fishing lure.

The power and ground for any gauge are going to be the same. For the MTX-L you'll need one ground (which you should have from your narrowband) and one SWITCHED power (a power wire that comes on ONLY with the key on, not one that's constantly hot). From there, there's a harness that comes out of the gauge and will connect to the supplied o2 sensor harness.

My best advice for you is to remove the front o2 sensor (factory, the one that your narrowband is spliced into right now) and put the new MTX-L o2 in it's place. Then on the back of the gauge itself you will have two wires coming out (along with the power/ground/o2 harness). There's a brown and a yellow wire. You'll then splice the brown wire into pin 76 of your ecu. The brown wire is a narrowband wire, since your ecu needs a narrowband signal to develope fuel trims you can't just unhook your front o2, or you'll get horrible mileage/performance. By splicing the brown wire into pin 76 it'll "simulate" a narrowband reading to the ecu, while still showing a wideband reading on the gauge. I like it because it eliminates an o2 sensor, plus when the o2 goes bad it's cheaper to buy innovates o2 then an oem o2.

Wow that was long, hopefully it helped. I've installed 2 mtx-l's in one of my 1g and one of my 2g.