Diff/Diff/fixed - 4 wheel braking - not as sharp on turn in - does not hold onto the corners as well when on power - very safe
Diff/Diff/centre-one-way - only rear wheels brake - fronts are still connected by a diff so it has more turn in than a fixed 4WD, but less than a one-way - same as diff/diff/fixed on power - safe but with the ability to move the rear end around under braking
Diff/one-way - only rear wheels brake - fronts have independant rolling so you get the most amount of turn in of all the setups - on-power its is a fixed front axel so it drags the car around the corner by the front, lots of on-power steering - not safe to drive, on very bumpy tracks it can make the car 'snatch' from side to side as there is no diff action so cusion the effect of getting a wheel in the air.
the fastest one is the one that gives you the best 5 minute run.
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