R56 MCS Auto 0-62mph figures????

[Scrogg]

Quote: Originally Posted by londonmark (original)

But for everyday driving on our roads, you benefit from having better acceleration. The difference in the top speed is neither here nor there, as you will hardly ever need to use it.

I totally agree, but were talking about two completely different scenarios.

Dazmac13 brought up the standing quarter mile thing, so I was just responding to that part of the discussion.

For everyday use I would be very tempted with an MCS Auto for the very reason you have stated.

[Dazmac13]

mmmm.....if its faster at accelerating then why the slower 0-60mph??

[wayche]

My guess is that has to do with the gear ratios, which are different between the manual and auto boxes. These figs are for the MCS:

Getrag 6sp MT:

Gears I - VI : 3.308 / 2.130 / 1.483 / 1.139 / 0.949 / 0.816
Final Drive: 3.647

Aisin 6sp AT:

Gears I - VI: 4.044 / 2.371 / 1.556 / 1.159 / 0.852 / 0.672
Final Drive: 3.685

Looks like your answer is right there... the autobox has a MUCH taller 1st gear, and the gap gently tapers off in 2nd - 4th. I'm guessing this is what leads to your slower 0-62 time.

As for the 1/4 mile time: The autobox has an ever so slightly longer final drive ratio, and shorter 5th and 6th gears, so I'm guessing that gives it greater legs than the manual once it gets past 4th gear and closer to the 1/4 mile trap. It probably ends up with a higher trap speed as well.

[Dazmac13]

surely a longer 1st and second gear wuld mean that acceleration is theoretically facster and that the only reason its slower in terms of time is becasue you cant hang the revs and then dump the clutch?????