Custom PID
Thread Starter
Teching In
Joined: May 2003
Posts: 47
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From: Winter Park, FL
Custom PID Need a little help please. Trying to figure out for sure what the custom PID should look like that I need to enter into logging for LM-2 wideband. The manual for the LM-2 states that 0volts=7.35 AFR and 5volts=22.39AFR. I'am going to be logging through the EGR and the PID for this is[2811]. Any help would be appricated.
22.39-7.35=15.04 - AFR spread
5-0=5 - Voltage spread
5/15.04=0.332 - Volts spread/AFR spread
[PID.2811]/0.332+7.35 = AFR
You can change the wideband output to read 10 AFR @ 0 volts and 18 AFR @ 5. That gives you more resolution in the usable AFR range. Using those numbers in your LM2 would make your PID look like this: [PID.2811]/0.625+10 = AFR
5-0=5 - Voltage spread
5/15.04=0.332 - Volts spread/AFR spread
[PID.2811]/0.332+7.35 = AFR
You can change the wideband output to read 10 AFR @ 0 volts and 18 AFR @ 5. That gives you more resolution in the usable AFR range. Using those numbers in your LM2 would make your PID look like this: [PID.2811]/0.625+10 = AFR
