Slipping Torque Converter?
 

Hi All,

My 2012 IS F does something kind of strange. When it is not fully warmed up, driving down the road in 8 gear the rpms seem to be a bit higher than once it reaches a certain temp. because it then seems to shift again to a lower rpm. It seems that the torque converter is possibly slipping a bit until it reaches a certain temp. and then locks up thus reducing the rpms. I don't recall this happening in my '09 F. It's not a problem but I am wondering if anyone else has experienced this.

Same with my 2010.

normal. Also, try to shift manually when the car is cold at WOT and watch what happens :-D.

yep.. normal.. i thought something was wrong with my car when it first did that, but once i test drove my buddy isf, its acted the same...