One of the hardest to grasp aspects of Borderlands 1 was the Tech pool. It was a pool of points that elemental "procs" cost. Confusingly this gameplay feature was never directly referred to in the game and it made understanding elemental weapons very complicated (and hard to explain). A key point was that there were different levels of procs; 2x,3x and 4x, each of which did more damage, had larger visual effects and depleted more of your tech pool.
I realized when writing What element types are good against which enemies? I don't actually know if Borderlands 2 has this. BL 2 appears to have ditched this for a simpler "X% chance of elemental effect"; that makes sense, it makes elemental weapons a lot easier to wrap your head around. Best I can tell, the tech pool no longer exists; there don't appear to be different levels of procs; either a shot causes a DOT effect or it doesn't. Throwing lots of elemental effects down range doesn't appear to drain my ability to cause further elemental hits.
I haven't seen the noticable 4x procs that deal crazy damage and leave blindingly large visual effects. But the tech pool was so opaque I can't really be sure; I may simply not have noticed, or my guns may not be good enough to cause higher level procs.
Does the elemental tech pool exist in Borderlands 2? If it's still around, what are it's mechanics?