Not jumping on update 4.12

Have this tied up to a keybind and setting the pawn location works so i know its being called but changing the velocity component doesnt work, any ideas?

On an extension of PlayerController



void ABearPC::Jump()
{
	APawn* Pawn = GetPawn();

	FVector NewV = Pawn->GetMovementComponent()->Velocity;
	NewV.Z = 800;
	Pawn->GetMovementComponent()->Velocity = NewV;
}