Just thought I would let you know about a non-adjustable (normally...) angle that has a LOT to do with driving sideways
Ackerman is basically toe out on turns. Meaning that as you turn harder the inside wheel points more towards the inside of the turn than the outside (inside wheel turns 20*, outside turns 15*). What this means for drifting is that with the wheels pointed in the direction you are moving, there is a massive amount of toe out happening. When that occurs the front of the car has both less traction and more drag than is ideal for trying to drive sideways (ie the front slows the car down, leading to a spin). Making the front wheels parrallel should in theory make the car easier to control when sideways.
We have made an XD falcon have zero ackerman for speedway purposes, and it made the car way easier to control. As this was the only change made, and the races were two weeks apart, it's not possible to blame anything else.
The method was simple, cut the steering arm off the hub, and weld it on so that the joint was directly behind the bottom pivot point of the hub. The steering arm is now parrallel to the wheel when viewed from the top.
It worked fine on a speedway car, you drift boys should give it a shot.
Note that this is likely to be illegal for road use (cutting and welding of a major safety component), and the car will scrub the front tires in pretty much any turning manuver that isn't taken sidways with countersteer.
Have a think, and someone try it on a drift car.
cya
Ben