who got the fastest walker ??

hi guys.. im working on fast walkers atm.. anyone know the link for the fastest known walker ??
it must run without invinsibility and without mods..
i might as well make mine the fastest when im at it ;)

project so far : http://www.besiegedownloads.com/machine/25293
no mods used.
i kinda hit the wall now.. all known problems as balance and turning is solved ..
now 2 new problems occured..
its so fast it can cause game to lag if running over 150%
and now gravity start ripping it apart..

so fast i need propellars to keep it to the ground.

help and tips are more than welcome