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      04-22-2020, 07:37 PM   #1
Speenybean
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Downshifting

Can someone possibly explain to me why sometimes when I use the paddle shifting and I down shift the car immediately shifts down and revs higher but other times when I down shift there is a delayed reaction of a couple secs before the gear drops???? It's baffling me.
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      04-22-2020, 11:19 PM   #2
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I believe that's just the nature of the beast? The computer just lags sometimes I guess. It's happened to me also.

It's just not as refined as Porsche's PDK.
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      04-23-2020, 04:40 AM   #3
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If you are on more throttle downshift is quick

Low or no thr its slow
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      04-23-2020, 04:54 AM   #4
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It depends which gear the transmission is predicting you will change to next. If you're in 3rd and it has 4th waiting on the other clutch, then you change to 2nd it will have to change the gears before switching clutches, this takes a little longer.

If the gearbox predicts you'll change to 2nd and you do then its instant.

The gearbox predicts this by using various different inputs from the vehicle, speed and load etc.
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      04-24-2020, 07:28 AM   #5
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It’s like the people above have said, it’s trying to guess what you are going to do next. If you are slightly on the brake and downshift it will downshift fast since it knows that normally you wouldn’t brake and upshift.
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      04-24-2020, 08:06 AM   #6
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When I first got my car the DCT felt strange but once I got used to how it behaves I feel like it's nearly PERFECT. I love how I can play with the accelerator and paddles to make it nearly drive like a manual or I can just chill and let it take control like a full auto, plus the fact that I can let off the brake at a light (on level ground) is really cool. Nothing like just hovering over the accelerator ready to hit "go" when the light turns green. I've had similar experience as you using the paddles and I appreciate the clear explanation...
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      04-24-2020, 10:21 AM   #7
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Quote:
Originally Posted by Dwaynos View Post
It depends which gear the transmission is predicting you will change to next. If you're in 3rd and it has 4th waiting on the other clutch, then you change to 2nd it will have to change the gears before switching clutches, this takes a little longer.

If the gearbox predicts you'll change to 2nd and you do then its instant.

The gearbox predicts this by using various different inputs from the vehicle, speed and load etc.
This sounds like additional wear and tear on the clutch plates. No?
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      04-24-2020, 10:34 AM   #8
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Quote:
Originally Posted by Blaxwil View Post
This sounds like additional wear and tear on the clutch plates. No?
Not at all no, it doesn't use the clutch to pre-select the gears, it just uses them to engage drive from the engine once it has selected the gear to be used.
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