How to immediately enable motor after armed

question: how to immediately enable motor after armed.

detail: ardupilot copter enable motor after armed need some time(about 3 seconds ). I want to enable motor immediately. what can i do?

english is not my first langue. maybe have some error in langue, sorry.

I finded. The function need to change ARMING_DELAY_SEC in ./ArduCopter/config.h