CS Transmission Flash for BMW M2 F87: A Game Changer for DCT Tuning

Having experimented with the BM3 GTS transmission tune on my Stage 2 DCT N55 M2, I encountered some drawbacks that prompted me to seek alternatives. Specifically, the low-speed jerkiness in comfort mode, less-than-ideal shift points in comfort auto mode, and the cosmetic “C” prefix on the gear indicator were persistent annoyances. Dissatisfied with these aspects, I decided to explore the M2 CS transmission flash by Kubax86. After several days of driving with this new flash, the improvements are significant and worth sharing.

One of the most immediate and welcome changes is in comfort mode. The steering feel, which I previously found excessively heavy at low speeds, is now noticeably lighter and more manageable. Navigating tight spaces like parking garages has become considerably easier and more pleasant. Beyond the steering, the low-speed smoothness is dramatically improved. The jerkiness that plagued the GTS tune is entirely gone, making daily driving in comfort mode genuinely comfortable. This enhanced smoothness alone justifies the upgrade.

Switching to Sport and Sport+ modes reveals further refinements. The exhaust note takes on a slightly more refined character, becoming a touch less deep and throaty, but not quieter. While I typically disable burbles via BM3, the CS tune allowed me to add a subtle .5-second burble at level 8 aggressiveness, resulting in occasional, satisfying pops on downshifts. Shift speeds in both directions are noticeably quicker than the stock transmission tune. Upshifts are on par with the GTS tune, but downshifts are where the CS flash truly shines, feeling faster and more responsive compared to BM3’s GTS transmission tune.

Due to inclement weather in Kansas, I haven’t had the opportunity to rigorously test the differential aspects of this tune. However, based on the improvements in other areas, I anticipate positive results.

In conclusion, if you are frustrated with the comfort mode performance of the stock transmission tune or even BM3’s GTS transmission tune, the CS transmission flash is an absolute must-try. It addresses the key issues at a fraction of the cost of alternatives like the THOR Flasher. The process is straightforward, requiring just an hour, an ENET cable, and a Windows laptop. Kubax86 provides excellent support and the transformation in driving experience is remarkable. For anyone seeking a refined and responsive DCT tune for their BMW M2 F87, the CS transmission flash is a highly recommended solution.