Hello Delta1,
my IS220 (also long gear ratio) runs very well for a IS D-CAT. But he takes also 7 - 8 seconds in third gear. When the temperature is about 27°C, then the ECU reduce the power and the "flat spot" will be bigger, you can feel it until 1700rpm and about 4000rpm. It´s normaly and a "wish" from the engineers of TOYOTA.
Hi
Lexus Teesside,who are very good by the way, have changed the EGR valve and the VSV there is a slight improvement but I guess as your info suggests that this is something we have to live with. Thanks for the response