I doubt I could find a reference* but back in the day Rod & Custom magazine had an explanation that hinged on the line between the front and rear roll centers. If the line slope one way or the other you get under- or over-steer, if the line is level it's neutral.
Is that what Grand Turismo said?
*
Roll Center Explained - FMI Knowledge Base
Quote:
Effects of Front Roll Center Adjustment
Front roll center has most effect on on-throttle steering during mid-corner and corner exit.
LOWER front roll center
* More on-throttle steering
* Car is less responsive
* Better on smooth, high grip tracks with long fast corners
HIGHER front roll center
* Less on-throttle steering
* Car is more responsive
* Use in high grip conditions to avoid traction rolling
* Use on tracks with quick direction changes (chicanes)
Effects of Rear Roll Center Adjustment
Rear roll center affects on- and off-throttle situations in all cornering stages (entry, mid, exit)
LOWER rear roll center
* More on-throttle grip
* Less grip under braking
* Use to avoid traction rolling at corner entry (increases rear grip)
* Use under low traction conditions
* Increases traction, reduces rear tire wear
HIGHER rear roll center
* Less on-throttle steering
* Car is more responsive
* Use in high grip conditions to avoid traction rolling
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