I would like to get confirmation on the torque spec for the E9x M3 flex disc bolts. The car has M12-10.9 fasteners.
The "torque specs" thread (
https://www.m3post.com/forums/showthread.php?p=20922983) states:
(6) Giubo (aka Flex Disc) Screw and Nut (BMW TIS Link) -
55 NM (41 ft lb) plus 90 degrees
When I pull up the BMW TIS page for the E9x M3, there is no E90 entry specifically for the M3 (like there is for the E36 & E46), but there is an entry for the E90 with M12-10.9 fasteners that matches the above spec, but the description for that entry states "ZNS screws and nuts,
Shiny zinc coating, All versions". My concern with this description is the "Shiny zinc coating" part. The bolts on my E90 are
not shiny. In fact, the three that that bolt the disc to the transmission output flange are the normal dull zinc, and the three that bolt the disc to the driveshaft flange are painted black. The six new locking nuts are also a dull zinc.
Perhaps I'm being too pedantic when reading the TIS, but there are M3/M5 entries on the TIS page for M12-10.9 bolts that do not have "Shiny zinc coating" in their description. These entries list a torque spec of simply 115Nm (no angle) - see below. The E36 Bentley manual also states 115Nm for the M12-10.9 bolt in this application (matching the TIS). I realize this I am asking about an E90, not an E36, but same bolt spec in same application. However, note that E60 TIS entry has the same M12-10.9 bolt, but with the 55Nm+90 torque spec, and other models have the same bolt with simply 100Nm torque.
Can someone please confirm which flex disc torque spec is correct for the E9x M3 for the (dull) fasteners that I have? Thanks.