E9X M3 DCT Lauch Control Videos!
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04-05-2010 | 10:39 PM
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From: Rochester Hills, MI
E9X M3 DCT Lauch Control Videos! 
The M DCT uses two oil-cooled, wet multi-disc clutches and operates much like other transmissions of this type, such as VW/Audi’s DSG/S tronic. One clutch engages the even gears, and the other handles the odds plus reverse. Since only one clutch is engaged at any given time, the transmission anticipates and preselects the next ratio; a gearchange simply requires one clutch to release while the other engages, which means the M DCT can shift quicker than a manual transmission, and it drastically reduces the power interruption between gears. Overall, first gear with M DCT is actually slightly taller than in the manual, but the rest of the ratios are shorter.
The double-clutch arrangement also enables quicker and smoother shifting than in single-clutch automated manuals, such as BMW’s own sequential manual gearbox (SMG) found in the previous M3 and the current M5 and M6. If you’ve ever driven an SMG car, you know what we’re talking about. Even with various iterations and improvements, the current seven-speed unit found in the M5 and M6 leaves large, head-bobbing gaps in power between shifts, rendering it somewhere between annoying and unusable in full-automatic mode.
As with SMG, M DCT has a staggering 11 settings—five in automatic (D mode) and six in manual (S mode)—that determine how aggressive the shifts are, with the most brutal manual setting only available with the stability control off. A setting of four or higher means satisfying throttle blips accompany downshifts; settings one through three yield nearly imperceptible gearchanges. Manual shifting is accomplished via steering-wheel-mounted paddles (right for upshifts, left for downshifts) or the shift lever on the center console.
With stability control switched off and the transmission in the most aggressive setting, simply push and hold the shift lever forward and a checkered flag appears in the dash display to let you know you’re in launch-control mode. At that point, flat-foot the throttle, and the revs rise and hold. Using the cruise-control stalk, that rpm hold point can be adjusted between 4600 and 6100 rpm to tailor the launch to the particular surface. With your foot still flat on the floor, let go of the shift lever, and it executes a perfect clutch-dump launch every time. In this mode it also upshifts automatically through the first five gears.
4500 rpm start
YouTube - 2008 M3 DCT Launch Control test 02 @4500
5500 rpm start
YouTube - 2008 e92 M3 DCT Launch Control 1st test
Shift test
YouTube - 2008 M3 DCT Gear Shift Test
Exactly how I would order mine - I love the E90 lines!!
2008 BMW M3 With M DCT Double Clutch Transmission - Short Take Road Test - Auto Reviews - Car and Driver
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