Different engine all together. Traditionally, Toyota engine codes tell you alot about the engine. The first few characters before the dash tell you what series and what family engine block is. the characters after the dash tell you about the head and induction. e.g 3S-FE (old celica engine 80KW) "3S" tells us that it is "3"series engine in the "S" family. FE tells us that the economy head is used (narrow valve angles. less power but better fuel economy) 3S-GE (old celica engine 100KW) the "GE" in this case tells us toyota used the GE head (steeper valve angle)....GTE means GE head with Turbo. GZE means GE head with supercharger. Most people will know the now famous GT4 celica turbo engine - 3S-GTE or the supercharged 4A-GZE so to answer your question. standard corolla used 1ZZ-FE engine and the sportivo uses 2ZZ-GE. the block is from the same family (all alloy) but has different crank, pistons and connecting rods. The head on the sportivo has more aggresive valve angles, VVTLi as apposed to VVTi (no variable valve lift). the compression ratio on the 2ZZ-GE is a whoping 11.5:1. (i.e keep i tuned once it gets old or you will get serious Pinging) All the difference including a larger exhause and revised induction system allow the 2ZZ-GE to have the same displacement as the 1ZZ-FE but gives the 2ZZ 40% more power. hope this answers your question....stay tuned for the next episode of... "QKSLVR's rant" - same bat time, same bat channel! :P