I have been trying for ages to get a definitive answer as to whether or not Lotus beefed up the 2ZR for their supercharged Elise/Cup series of cars. When I started my search for information, I initially contacted Lotus USA, only to find out that the 2ZR was never used in their cars destined for this continent. The US Toyota-based Cup series used the 2ZZ Yamaha/Toyota engine.
Next, I contacted Lotus Cars (Auto Europe). Not surprisingly, they were not forthcoming with any info, citing their policy of not disclosing proprietary knowledge.
Finally, I found and joined a forum that focused on European Lotus cars. I also spoke with an outfit that does performance upgrades on the Lotus cars and communicated with an individual who owns a couple of them. The aforementioned performance outfit identified 285 BHP as a limit not to be exceeded without the consideration of more robust internals. This, of course, assumes a very good, reliable and safe tune. All nice folks over there and, after speaking with them, I am convinced that the engine that is craftily installed into the Cup series of Lotus cars is a bone stock 2ZR engine which is then supercharged (BHP ranging from 217 BHP - 250+ BHP, throughout the Cup Series 220 - 260). I asked if there had been any mods to the heads, such as upgraded valve springs and retainers, as the Lotus cars have a higher redline. The answer to that query was also a resounding "no". Of course, Lotus engineers would have written a masterpiece of software in their tune.
The reason for my interest...I want to know what sort of longevity I can expect out of my turbocharged 2ZR-powered Yaris RS. I also want to have a sense of the structural limitations as I plan to move forward with extracting a little more 'safe' power from my setup. I fully intend to switch my car from a piggyback computer to a standalone, which, despite its moniker, will actually work in tandem with my car's factory ECU.
Some of you may have already been aware of this information, but I needed to find this out for my own peace of mind.