I too noticed this on my wife's car and the
test car we drove. And like several people here has said the "small" delay seems more
like a "Transmission Thing" to me. (Normal)
Also like someone above said the remedy to
this is to "Quickly Ease" into the trottle.
I've tried "both" ways and believe me once
you get used to the "Quick Squeeze" of the
trottle vs the "Flooring" the trottle theres
little to "No" difference in the outcome...
ie, 0 to 60....... or Squeezing the trottle
to hit "Passing Gear".... The car "Still" has
plenty of POWER!!
So IS300, try that method. I've driven "Alot" of cars. This car isn't the first one that I've come across that has this
"personality". And Im pretty sure its the transmission thats causing the "small" delay
in downshifting to lower gear..... when you
"Floor" the trottle.
I know everyone's driving styles are different but "flooring" this car is really
unnecessary IMO. Or let me say "Flooring" the
car ALL AT ONCE is unnecessary. The method of
Squeezing the trottle quickly will ultimately
result in "Flooring The Pedal" if you don't let up........ Try it.