Once again, this has all been covered before, as you would have found out if you had used the search function. E.g. http://au.toyotaownersclub.com/forums/inde...wtopic=1036&hl= and http://au.toyotaownersclub.com/forums/inde...howtopic=93&hl= etc. etc. The major difference between i-VTEC and VVTL-i is that the Toyota change point is controlled electronically and mechanically, using an oil pressure check valve and water temperature. VTEC is only controlled electronically, hence is easy to change. Also, as stated the lift change point is at 6000rpm for a reason, as that is where it is most advantageous for this particular engine and cam combination. I do find it interesting though, that the Lotus Exige will change at 5800rpm on upshifts, to more easily stay in lift. The power/torque loss this incurs may not be such a penalty in this case as their car weighs much less than ours, and would still accelerate outrageously whereas we would notice the difference... But given a supercharger or turbo though, like the Exige 240R, and dropping the lift point to 5000rpm then becomes a feasible and desirable change.