I would hate to see this type of healthy debate turn into a sexist issue. I want all Infiniti drivers to know everything about their car. Congratulations to the ladies who have joined this club, this type of domain is typically known as a boys club, but keep in mind this is the EX forum we are all a bit older and more adult over here....I think.
The only flaming we usually hand out here is more than well deserved, your still fine. In the Infiniti forums there tend to be less bashing, unless there is too much spotty information. Many of the volunteer staff members here have spent years building honest content here. There are several other Infiniti forums that will spend pages screwing around with no actual facts but we strive to be a little different.
I have seen diameter measurements thrown around allot in these few threads but that is really only one measurement, and in the case of staggered wheels it is not the relevant one. The width and offset of the wheel are not being given the consideration they deserve. Altering the track of the vehicle will have an impact on the handling and mannerisms of the vehicle. Think about what would happen when you are accelerating into a corner and the offset is not what the control unit thinks it should be it will operate incorrectly.
The Atessa system was indeed designed for the Skyline, but made a little more everyday user friendly.
The GT-R uses staggered wheels but it is designed to so I am sure the traction control system can easily accommodate the difference.
As far as specifics, the best thing I can find is this segment from the service manual.
It would seem that a difference of >4mm could be enough to set a fault code and cause the light to flash (fluid over temp).
Personally I have been waiting since 2007 to see if someone will finally test the system and its capabilities. As I suspect it will act fine for a while but you will eventually notice a juttering while trying to accelerate through a turn at low speed, by the time you start to feel that though the transfer case is toast. I do really wish you the best with your test, and look forward to following this through.
This forum and other Infiniti forums are littered with threads like this. It is not really anything new. Some of the older Gs were actually picking up on even old coupe tires and those were only 17s with 225 front and 235 rears.
Why not stagger the wheels and use the same size tire?
Hopefully we can flush that strange Audi logic from your head and replace it with variable modern technology.