There are "some" pearls of literature to be found in the homologation forms, may be. BMC (#1201 Cooper S 1100) had a "high traction differential" recognized with no further indication I could find.
And if you're running a 3.0 litre Grp1 Capri, one homologated carb' - DFI 5 - might have a wrong venturi diameter after a certain date… Strange, no?
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