BenCarreiro
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- Jan 16, 2021
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Apologies for the long post, but have an AEM wideband / SCT question. SCT hasnt been much help... I cannot for the life of me get the analog output to read correctly in the X4 as well as the livelink software.
FYI I could datalog AFR/Lambda accurately via serial connection all day in HP Tuners before switching to Lito.
Wires are:
AEM power to designated power
AEM Ground to chassis gnd (also tried direct to battery during t/s)
AEM 5vdc white analog out to SCT FireWire orange
AEM neg 5vdc brown out to SCT FireWire blue
SCT FireWire gnd to chassis GND in 2 separate locations but also piggy backed on the neg 5vdc connection
Put my multimeter on the analog output from the AEM and I get correct voltage output for AFR reading on the gauge, (2.3750*v)+7.3125... v=3.15vdc~
Volts on X4 are 2.34 at idle with AFR around 14.6-14.9 which is different than the multimeter, LM1 setting shows the gauge AFR but not sure if that's accurate due to live link and the x4 being ridiculously off.
I've changed the equation as well in livelink, but it reads in the 40s and v reads 16-18
Lito has me video recording my AFR but would like to tidy this last bit up before I really start doing pulls for him with my new V3
Any help is appreciated
FYI I could datalog AFR/Lambda accurately via serial connection all day in HP Tuners before switching to Lito.
Wires are:
AEM power to designated power
AEM Ground to chassis gnd (also tried direct to battery during t/s)
AEM 5vdc white analog out to SCT FireWire orange
AEM neg 5vdc brown out to SCT FireWire blue
SCT FireWire gnd to chassis GND in 2 separate locations but also piggy backed on the neg 5vdc connection
Put my multimeter on the analog output from the AEM and I get correct voltage output for AFR reading on the gauge, (2.3750*v)+7.3125... v=3.15vdc~
Volts on X4 are 2.34 at idle with AFR around 14.6-14.9 which is different than the multimeter, LM1 setting shows the gauge AFR but not sure if that's accurate due to live link and the x4 being ridiculously off.
I've changed the equation as well in livelink, but it reads in the 40s and v reads 16-18
Lito has me video recording my AFR but would like to tidy this last bit up before I really start doing pulls for him with my new V3
Any help is appreciated