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11-26-2011, 03:51 PM | #1 |
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Best place to shift-dct
So I realized I am just not good at being able to take it all the way to 8400 without having fuel cutoff engage. I try to shift around when the needle passes 8k and usually that works but sometimes it is a bit to late and its hard to guess how much before 8400 to shift, in order for it to actually hit 8400 in manual mode? Same with the shift lights-sometimes I get it sometimes not. I am probably just inept but any tips may help!
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11-26-2011, 04:09 PM | #2 | |
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Don't the shift lights help with this issue at all? Maybe shift while it's amber? |
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11-26-2011, 04:43 PM | #3 |
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its all about feel and practice...i can shift at 8400 without looking
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11-26-2011, 04:50 PM | #4 |
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11-26-2011, 04:54 PM | #5 |
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I have seen videos and my friends have told me.
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11-26-2011, 05:05 PM | #6 |
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Except as a purely academic exercise, I'm not sure I understand the focus on shifting at 8400. If you look at the hp/torque characteristics of the engine, it just doesn't make much practical difference. On the typical road course, you're usually much more appropriately focused on what you should be doing with the other controls, in order to have the car where it needs to be at about the time it needs to be there.
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11-26-2011, 05:12 PM | #7 | |
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11-26-2011, 05:18 PM | #8 |
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good advice. Shifting at 8k or so sounds like a good goal and then you are likely to truly shift around 8200-8400 by the time it shifts. That is a good target to shoot for thanks
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11-30-2011, 05:24 AM | #9 |
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Isn't this what the Shift Lights are for?
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11-30-2011, 05:41 AM | #10 | |
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I make mistakes, but I'm getting there. |
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11-30-2011, 08:08 AM | #12 |
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This car revs so freely and quickly it's easy to just bounce off the limiter. Also, I believe you can adjust the sensitivity of the shift lights, ie. they come on earlier or later in the rev range. Don't think bouncing off the limiter is going to kill this car, at least hasn't killed mine yet I think you'll find seat time will cure all problems. The more I drive the more I love it
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11-30-2011, 08:22 AM | #13 |
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Why would you want to take it all the way to 8400? By the time the engine has spooled up to that level, the torque has basically long been acheived, and waiting to shift will likely have the negative effect you are attempting to avoid. Try and use your other senses (not smarts) to determine when to shift. Feel and sound should be key, and use your lights to assist in your alert to shift. As the christmas tree begins to light up, shift. Don't wait until it reaches the end, if you do, you have missed your shifting point.
vz
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11-30-2011, 08:44 AM | #14 |
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Well, D5 will shift at red, and if you do the math (or search the forum - its been posted before as I recall) you will see the car is fastest when shifted at max RPM.
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11-30-2011, 09:34 AM | #15 | |
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11-30-2011, 12:47 PM | #16 | |
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You're pushed back in your seat at the shift not by power or torque, but by rotational inertia. The engine is forced to slow down in an instant by, say, 3000 rpm or more on the one-two shift (less as you go up through the gears), and that energy is transferred through the driveline to the rear tires. If the auto has a setting that will shift at the rev limiter, that's the one to use. Otherwise, use the one that shifts at red line. Bruce |
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11-30-2011, 04:28 PM | #17 |
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Guys, the simplest way to think about this is when an engine has a very linear power curve like the M3 the power you are producing is directly proportional to the rpm. Shift always at 8k instead of 8400 and you are only using
8000/8400 x 414 hp = 394 hp This is a very rough calculation but shows even an 8k shift is leaving about 20 hp off the table! Not a huge difference (5%) but if you are counting 10th's or simply want to be insured you are moving out as best a possible you have to shift at redline.
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11-30-2011, 04:57 PM | #18 | |
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11-30-2011, 06:37 PM | #20 |
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That's what's great about raising the rev limiter to 8600rpm. I did this with the ESS tune and now I can shift at 8400 RPM without hitting the limiter. I don't even have to look at the rev gauge, just shift when the lights turn red and I get a perfect shift every time.
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11-30-2011, 06:48 PM | #21 | |
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Of course, it might blow up, but that's a small price to pay for another tenth or two, isn't it? Bruce |
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11-30-2011, 07:01 PM | #22 | |
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