We have found that over-filling the DCT transmission by 1 liter will ensure proper shifting when on track. Even at the proper factory level, the higher g forces on track can prevent sufficient oil circulation inside the transmission, leading to slow shifts, mis-shifts, and transmission fault codes - something we have experienced first-hand in street and full-race M3/M4 cars.
Video: BimmerWorld DCT Overfill/Dry Break Kit
This dry-break fill system is borrowed from the factory GT4 design. Overfilling on the side of the transmission is almost impossible as the fluid trickles out when overfilled. This dry-break allows you to pump in an extra quart of DCTF and then quickly close the valve when complete. You must still follow the factory fill/level procedure using the factory diagnostic tools (ISTA, Rheinegold, etc). It's crucial to have the correct oil level before adding any additional fluid. And it's crucial to have a precise measurement of extra fluid - 1 quart = 0.95 liter.
This is an easy, must-have addition to your M2/M3/M4 track car build. No modification is required - the banjo fitting is the correct size for the DCT transmission. The plug uses a 8AN barbed fitting so you can likely connect your favorite fill pump and tubing with ease.
2 Series F87 (19-21) > M2 Competition F87 (19-21) > M2 CS Racing 3 Series E90 / E92 (08-13) > M3 3 Series F80 (15-19) > M3 4 Series F82 (15-21) > M4 F82 (15-21) > M4 GTS F82 (15-21) > M4 GT4
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$149.99BimmerWorld DCT Overfill/Dry Break Kit - E9X M3, F8X M2/M3/M4Quickly and correctly add extra fluid for consistent DCT operation on track