Before opening the nitrous bottle, Brian enters the PMS unit’s Nitrous Option Tables and adjusts timing settings. Timing changes for nitrous are basically stacked on top of any other active changes. For example, if a wide-open-throttle tune commands 6 degrees of timing per 5,000 rpm, and the nitrous option is to retard timing by 8 degrees at that same point when we’re on the spray, a net timing adjustment of 2 degrees will be pulled from the PCM. To use this feature, the hot (12V) side of the nitrous oxide solenoid must be linked with the PMS’s accessory plug. When the system is set up this way, the nitrous adjustments are applied every time the button is tagged.