In preparation for getting HPTuners today, I spent some time over the weekend installing a bung for the WEGO III wideband AFR sensor I picked up. It uses a Bosch LSU 4.2 oxygen sensor.
The sensor seems pretty nice after reading about it. The device has the capability if connecting a tach signal and TPS or MAP sensor to datalog. It has it's own software to run independently which supplies data with USB. The greatest thing that made this a good option for me is it was cheap and came with a 0-5V output to connect to tuning software.
The brown wire (to tach signal) and the green wire (for MAP sensor) are not needed to connect to HPTuners. The ground wire for the sensor and device are both grounded to HPTuners. I just need to find a good spot to tap the red power wire to a switched power source. I am thinking the easiest spot is the pink wire that powers the ECU but I will need to add an inline fuse....
I finally stopped being lazy and dropped the exhaust to add the flex pipes. I found the sweet spot that allowed me to add the O2 bung about 10" downstream from the header collector. This gave the most room for the sensor to be added.
Once I made the cuts, I bolted the mid pipe and mufflers back in to the car with the flex pipes roughly added in.
This allowed me to get the exhaust tips EXACTLY in the same spot they were before. I had Katie look from the back as I got the mid pipe centered to tack it in.
Everything went fairly smooth except for running out of welding gas! I was able to pick that up Monday and finish the job last night. Before throwing the sensor in the car, I had to do a free air calibration on the sensor to dial it in.
As you can see, this left a good amount of room for the sensor.
This worked out perfect and allowed me to zip tie it to the transmission harness up and out of the way. I fed the wire through the driver side firewall and over the pedals through the center dash. Sine my radio was removed and sold, I will be making a mounting plate probably there for the device.
I wasn't able to finish up the wiring yesterday, as I want to find the best routing for the output signal, usb, and the ground. If used independently, the ground needs to be mounted to the chassis. If used with HPTuners, it needs to be connected to the handheld. So I need to find a good spot i can quickly remove. Still looking for ideas.