Fitting sensors
- The car already has usable CLT and TPS sensors.
- There's a connection on the plenum all ready for MAP
- There's no IAT sensor at the moment
- I will be removing the old MAF sensor
- Old narrowband sensors are not good as they are titania type and too expensive - they have been replaced with a pair of LSU widebands.
Testing the Sensors
I've bench tested the NTC sensors and they work in pots of water at varying temperatures. Here's a picture of my "lab" (kitchen)
I need to add a IAT sensor to the plenum somewhere. Found one in a scrappy for £1. It works nicely. Here's a shot of it installed in the plenum.
I have recompiled the firmware for the non-GM CLT & IAT sensors. Need to refine the calibration more as the IAT isn't quite right yet.
Wideband Lambdas
I have done some work on the exhaust so the widebands will fit. Two new bosses have been welded in as the LSUs are bigger than the old sensors.
I've fitted two - one for each bank. I understand I need to modify the firmware for the 2nd to be supported, so until I get that to work, I'm running with one, and the other hole blanked off with an old lambda sensor.
[Add pic of modded exhaust]
Q: What mods do I need to do to the firmware for having 2 widebands? And how does this affect the use of Megatune for configuration?
Currently reading the firmware code to see if I can work this one out for myself...
Calibration of WBO2
This is well documented in the wiki and manual, but the q & a here is interesting to keep.
Q': Should the cal resistor in the wideband sensor be connected to anything? It isn't in the diagram (it's on pin 2, and this appears N/C)
A: The calibration resistor is not used in the v3.x wideband controller implementation, calibration is done trough adjustment of the calibration constant until your free-air o2% matches 20.95%. However, measure and document Rcal (allows verification of wbo2_calibration value). Don't forget that wbo2_calibration value is sensor dependent.
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