MembersPage/DavidBlades/SenTest (2006-02-25 08:41:23)

Fitting sensors

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)

sensor_cal_sml.jpg

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.

iat.jpg

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.

We need to modify the firmware for the 2nd to be supported. Until than, I get that to work, since the LSU4 sensor would be ruined due to deposits if unheated:

[Add pic of modded exhaust]


Firmware mods for 2 widebands

We have some code in the round to be backported (mostly prepared for 2 channels, but some more changes still needed)

Calibration of WBO2

This is well documented in the wiki and manual, but the q & a here is interesting to keep.

The cal resistor in the wideband sensor is NOT connected. We use the wbo2_calibration setting in firmware instead of the cal resistor. Just measure the cal resistor for verification

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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