6MT vs Dual Clutch

[MCarsFan]

I was in traffic for a total of 2.5 hours yesterday with the M5 (in Manhattan bumper to bumper).

- The car has 3 shift settings, 1,2, and 3. 1 is the least aggressive one and 3 is the most aggressive one. Aggressive being upshifting quickly and not downshifting easily. So in setting 1, it will upshift in 1500 rpm and hold the highest gear possible.

- The problem is, in setting 1, you got no power. None. Car is in borderline stalling territory. In setting 3, this thing never shifts to higher gear even in 4000 rpm causing extremely jerky driving.

- So as a result I use setting 2. This is what the car does: say I can only accelerate 100 yards before stopping again. It will go from first to second and then right away to third. At third, it has no torque. I slow down now it shifts down to 2nd and when I slow down further down back to first. So the entire fucking time it goes 1,2,3 and 3,2,1. Whereas in my mustang I would be in the first most of the time and only yse 2nd when I know for sure I will keep my speed higher for longer periods of time. The computer cannot read my mind and doesnt know that.

- There were cases where it went from 1 to 2 to 3, then I had to make a sudden lane change, but guess what because the idiotic transmission is on 3rd gear at 1100 rpm, i had no power. I could depress the pedal more resulting in a jerky quick shift. You see my point? Not smooth. A human driver would have never shifted to 3rd in this case. And would have held 2nd gear.

- I could use the manual mode but guess what because of the uber anti lag technology (which is amazing when you are WOT), this car above 1500 rpm has so much instant torque (all 516 ft/lb of it), a slight tap of the gas results in very jerky movement (not the case in the shelby).

The conclusion is naturally aspirated and manual transmission is far smoother combination. When technology gets involved and we humans start complicating things, we usually screw things up. Older is always better

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[MCarsFan]

One thing to add, and this is a problem more in the traditional torque converter automatics. The "release clutch with no gas" method of moving the car in slow traffic of a manual car is far superior to anything else out there. The creeping mode of DCT is definitely better than the regular torque converter as I believe torque converter goes way too fast resulting in you having to apply brakes all the time, however, even DCT is way too fast and jerky. I could survive by simply using the 3rd pedal, no gas and no brake, in bumper to bumper traffic.

 

[Norm Peterson]

Can we all at least agree that a CVT is the worst transmission of them all?:cheers:

Yes. Although I will note that it does have some potential advantage as long as the drive pulley doesn't have to be too small (and require aggressive torque management in order to survive).

But I really don't want any shifting - whether as a continuous ratio variation or in discrete steps - to happen based on what my right foot is/is not doing. That body part is for controlling what's going on in front of the transmission or way after it (at the brakes). Not inside it.


Norm

 

[J_Maher_AMG]

Can we all at least agree that a CVT is the worst transmission of them all?:cheers:

While I agree because of the garbage CVT's that manufacturers have designed based on the silly wants of consumers with simulated gearing, a true CVT in theory and one built with performance in mind would actually be the best transmission if it could deal with higher power levels

Never a drop off in power, with the transmission constantly holding at peak hp output! I hate the idea because it's lame as hell but it would be quite efficient at going fast if done right

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