There is plenty of opinion on Lambda sensors & prevailing knowledge from both GBS and the forums is they are not necessary once the engine has been mapped on a rolling road.
GBS also rekon the stock Power & Emissions maps are good enough to get through the IVA - although might need a little tweaking during the test.
I didn't want to invest in a wideband sensor, but like the idea of developing an emissions/economy map which 'knows' what is going down the exhaust. My ultimate plan is two maps:
- Emissions & economy running the narrow band lambda at 14.7 AFR
- Power map - initially the GBS one and maybe a rolling road tuned one later
The narrow band setup is much more reasonable & apparently longer lived than wideband, but much more limited in how it can be used - it really only measures 14.7 AFR.
Challenge #1 was to identify the Lambda plug on the GBS stock loom - its a Deutsch DTM & I found one being sold on Ebay for less than a tenner. The pins are meant to be crimped with a proprietary Deutsch tool which sells for £200 ! - instead I crimped with pliers and added a small solder end for good measure - being careful not to let the solder wick back up the cable:
Screws into the manifold & then just needs a hole & grommet through the side panel back into the engine bay. I attached the pins to the cables on the bench then passed through the side panel for the socket assembly:
For IVA the sensor and sharp edges will need a little exhaust wrap.
Connections are thus:
Belt & braces working out the wiring - I traced & tested the loom cabling back to the ECU and as expected it was correctly terminated on the default pins.
Signal Ground - Sensor: Grey - Plug: Blue - ECU: pin 18
Heater Control - Sensor: White - Plug: Green & White - ECU: pin 36
Heater 12v - Sensor: White - Plug Black - 12v switched feed
The loom routing:
