06-05-2017, 10:38 AM | #1 |
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DCT behavior at autocross
Does anyone here have first hand experience autocrossing with a DCT car? From what I can see, DCT gear ratios are extremely short which I imagine means using third with most courses (every course?). Are people shifting manually or does the car's auto mode downshift well enough to not think about it?
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06-06-2017, 12:35 AM | #2 |
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Sad as it is most of my best times have been using sport+ in auto mode. At the last event I tried many different combos and leaving it in 2nd using the torque was fastest.
I tried "all off" but that puts the car back in sport mode and I don't the response as well as sport plus. Tires are 265 square star specs. |
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06-06-2017, 12:37 AM | #3 |
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Sad as it is most of my best times have been using sport+ in auto mode. At the last event I tried many different combos and leaving it in 2nd using the torque was fastest.
I tried "all off" but that puts the car back in sport mode and I don't like the response as well as sport plus. Tires are 265 square star specs. |
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06-19-2017, 02:27 PM | #4 |
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I've tried both, and I have found the manual mode to be fastest for me around a given course. I have been up into 3rd, but the courses I've run (only a few so far) have been mostly 2nd gear with a pop down into first for a slow tight 180. Left-foot braking in automatic mode seems to invoke additional intervention from the engine management that results in waiting for the car to relax control.
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06-19-2017, 02:51 PM | #5 |
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I have been driving autox for 19 years (MT for 15 years). I have a friend who sometimes drives my M2 with me shotgun at autox events and track meets. He always drives in auto mode. And I'm impressed by the autosoftware. It is IMHO very good at being in the right gear at all times.
But I always always drive the DCT in manual mode (with DSC fully of or if in wet conditions sometimes in traction mode) Manual mode enables me to shift exactly where I want, even in the middle of a section. And sometimes choosing short shifting to limit the available power in low gear situations to limit risking loosing the rear. I LOVE the M2 DCT in manual mode :-) |
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06-22-2017, 05:14 AM | #6 | |
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06-25-2017, 05:49 PM | #7 |
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These are my results from today...
45.254 - MDM + Sequential 1 & 2 44.088 - MDM + Sequential 1 & 2 44.432 - DSC off + Sequential 1 & 2, I got too loose on a turn or 2 41.827 - Sport + 42.166 - Sport + 41.500 - Sport + I was running stock in B Street on stock Contis (~5K of wear)...everyday air pressures...tires held up beautifully. Oh and this was my first ax in 15 years!! For reference the B Street leader a 2016 Ford Focus RS running track tires, all wheel drive and competes nationally had a best time of 36.805. Last edited by omasou; 06-25-2017 at 07:15 PM.. |
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06-25-2017, 10:57 PM | #8 | |
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Yep. I get my fastest times in sport+ as well. It sounds like you're ready for some re71rs! |
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06-26-2017, 07:25 AM | #9 | |
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The BS leader in his RS with track tires ran a 36.805. Another RS on his "stock" Michelin Pilot Sports ran a 37.634 So if we say this course was on average 38 seconds (looking at the results for all classes). How many seconds could I reasonably expect to pickup without any other changes except tires? |
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06-26-2017, 10:37 AM | #10 | |
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