what OD button does is it disables your 4th gear, that is why you see that RPM ups and downs. when its off it also makes tranny shift with the delay so for example in stead of switching to upper gear at 2k rpm you will switch at 3k. as to the ECT this button doesnt really do much. it gives the same effect as if you floor it. it supposed to change the shifting logic if the tranny ECU but you cant really feel it. i did some field tests on ES, LS and GS models and no1 feels a bit of a difference.