Gen 2 Hayabusa STP Fuel Trims

josh@ftecu.com

This post is to address the use of the STP fuel trim maps. These maps control the fuel from the secondary injectors. This is used by Suzuki as a emissions control system. If you open the maps, there are only changes in the ranges needed for emissions testing. All the numbers are negative, this is leaning the mixture.

For performance tuning, these maps should be all set to zero. Fueling changes should be made in the TPS and MAP tables when needed.