Quote:
Originally Posted by Old Geezer
Driver skill counts for more than DCT vs. 6MT. A DCT M2 took BS in our region last year.
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Quote:
Originally Posted by Phab
Thanks, so it's just a matter of preference then.
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No question skill is a huge component. However, just note that DCT adds 55 lbs in a 3500lbs car, so results in a 1.6% reduction in power/weight ratio from an acceleration standpoint. Note 55lbs is BMW's quote on the increase for DCT, but Car and Driver measured it at 67lbs (M2 Comp tests).
Also consider launching and trying to achieve the best 60' time (or whatever initial launch interval you want to consider), where with a 6MT you have complete control over the engagement, weight transfer rate to rear tires versus power applied to them, etc. DCT 1st gear is really short, so hooking and controlling the launch can be challenging. This is probably the reason C&D was able to time a 3.9 sec to 60mph with the 6MT and 4.0 with the DCT M2 Comp.
Given that most autox courses result in 1 upshift and then 2nd gear the whole time, DCT disadvantages have the potential to be more meaningful. DCT has a shorter 1st and 2nd gear, so that might require 2-3 shifts in a DCT car where the 6MT can hang in 2nd as it has about a 12% longer 2nd gear.
All the above is in reference to the M2C but would imagine the OG DCT is a similar comparison.