Just reporting what the SM for 2016+ models had written/graphed for the torque splits, it's possible it's inaccurate due to poor translation me and Avedis were discussing this a few weeks back
That was the case for the G37x models to be sure but with the Q50 it appears they've revised the AWD programming so it engages in a more pro-active manner instead
of a re-active one. As I mentioned to John the SM seems to state other-wise.
You mean "Avedis and I", don't you?
It's difficult to find detailed information regarding Infiniti's ATTESA AWD system and what it specifically does or does not do. Take SNOW mode for example. The Owner's Manual simply states that SNOW mode changes the engine characteristics to aid driving on slippery roads. The SM states that SNOW mode changes the throttle angle characteristics to control torque and selects a different shift pattern. The TCM may change shift points but there's no information I can find that says the car starts out in a higher gear in SNOW mode.
There are unsubstantiated posts in other forums which say that in SNOW mode, the car starts in a 50/50 F/R split up to 12 mph and then migrates to RWD if no slippage is detected.
As far as what AWD does when in other modes from a standing start, it's still pretty vague what's really happening. There's information on the web that says ATTESA always starts at a 25/75 F/R split and migrates to a 0/100 F/R split if no slippage is detected.
The SM refers to a "Vehicle Starts Control" as an operation characteristic of the AWD system in the Transmission and Driveline section. It states:
Vehicle Starts Control
• At the start, torque distribution for front and rear wheels is fixed by electric control and stable start is achieved.
• Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.
The question is: Is this normal operation in all driving modes or is it just in SNOW mode as it seems to allude to? I don't know. JohnInNH's statement about a short amount of rear wheel slip before AWD engages doesn't necessarily conflict with the information above. Even if there is a 25/75 F/R split on start, I could see how some initial rear wheel slip could happen before the bias shifts more to the front wheels.
So I'm not really sure what is suppose to happen given all the anecdotal information out there. If anyone has a link to technical information on Infiniti's ATTESA AWD system that goes into sufficient operational detail, I'd sure like to see it.