Originally posted by D4G
I use version 1.16 but it seems like you can only raise the torque...
Horsepower is a calculated value and not something you directly raise. HP is the result of torque X RPM / 5252. In an engine you can change the torque and you can change the RPM either of which will change the horsepower. Torque also changes with RPM but that is a physical reality of the engine and not due to the calculation method.
Also changing parts with GT6he makes you go fast.
Exercise your chemistry.