Mob aggro range help?

I had another post about changing mob speeds, I managed to get one mob working with some peoples help in it, and frankenstiening together peices from other threads and it working now.

But it seems what I THINK is the aggro range doesn't effect anything.

its these 2 lines: (I did the approach of making my own Zombie class that extends EntityZombie)
this.targetSelector.a(2, new PathfinderGoalNearestAttackableTarget(this, EntityHuman.class, 46.0F, 0, true));
this.targetSelector.a(2, new PathfinderGoalNearestAttackableTarget(this, EntityVillager.class, 46.0F, 0, false));

I have set them to 46, but you still need to be almost next to the mob for them to target you, and I assuming the wrong place to change it?

 

what is this, what is this.targetSelector?

 

its part of the EntityZombie.class I'm duplicating to make my zombies, then replaceing the spawn event entity with mine.

its the one in Craftbukkit.
https://github.com/Bukkit/CraftBukk...n/java/net/minecraft/server/EntityZombie.java

edit: using a combo of what help I got from my other thread, and this..to tweak them some:
http://forums.bukkit.org/threads/best-way-of-changing-mobs-move-speed.65378/#post-1118928