Before the AMA allowed traction control, I've heard the Suzukis stuttering leaving corners. That's a tell-tale sign of TC. A common method in drag racing without wheel sensors is setting a limit on how fast an engine can rev. Through lots of testing a maximum engine acceleration rate can be determined, and when the engine surpasses that rate a limiter is engaged. No more spikes when the rear tire loses traction. It's all done through an engine timing computer. Pretty cool, actually.
