no lah. quite normal. if you retard the timing correctly the pick up torque is quick esp for maibi. meaning you fire the piston when its accelerating downwards at low rev, pushing along side with the momentum of the piston. most stock engine don't provide such performance due to lowering down on fuel, emission regulation as well as linearity in driving dynamics. older people have trouble controlling pedal so they need to smooth out the engine output.

ayam pasang KKT only for playing piak piak piak , but i believe we need to maintain tekan driving style since original ECU adapt with our driving pattern , most tuner are just tune using CAN copy and paste ,best is change to standalone .
VVT-I open at 4k rpm , is that real ?