Originally Posted by
Blacky
Although the A/D converters in FlashScan are 0-5V, they are limited to 4.8V due to buffer protection. The protection prevents unintended voltage spikes on the A/D input wires from destroying your FlashScan unit. (i.e. dragging an exposed wire across a 12V battery terminal)
You can either:
1. reprogram your wide band O2 controller to output 0-4.8 volts
2. ignore any AFR readings above the AFR for 4.8 volts. Usually that's around 19.6:1 AFR, which you'll never be attempting to achieve if tuning for performance. (this is the preferred option)
DO NOT change the EFILive calculated PIDs to force a 4.8 volt input to display as 20:1 AFR (if 20:1 AFR is 5.0 volts on your wide band controller).
Regards
Paul