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How many gears should the DCT kickdown?

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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sunnydays
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How many gears should the DCT kickdown?

Post by sunnydays » Sun Nov 19, 2017 9:37 pm

Hi guys,

So my 35is, under heavy acceleration (not quite pushing down the kickdown, and when pushing down the kickdown) is going down from gear 5 @ 40mph to gear 2....

Now im pretty sure it normally only goes down 1 gear, ie gear 5 to gear 4.
Can someone confirm my logic is correct and im not going bonkers?

Thanks

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How many gears should the DCT kickdown?

Post by mcbutler » Sun Nov 19, 2017 9:42 pm

Gearbox knows best - apparently!!!!
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Gaffa22
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How many gears should the DCT kickdown?

Post by Gaffa22 » Sun Nov 19, 2017 9:53 pm

Had mine go from 7 down to 3 the gear is determined by the revs
If you bury the throttle at around 65-70 it will change down to 3rd
If you use the paddles or shifter it will only go up or down 1 at a time
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How many gears should the DCT kickdown?

Post by HillWalker » Sun Nov 19, 2017 9:54 pm

It'll drop down enough gears to give maximum acceleration for the given amount of throttle regardless of initial speed.

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How many gears should the DCT kickdown?

Post by Ducklakeview » Sun Nov 19, 2017 9:55 pm

Gaffa22 wrote: Sun Nov 19, 2017 9:53 pm Had mine go from 7 down to 3 the gear is determined by the revs
If you bury the throttle at around 65-70 it will change down to 3rd
If you use the paddles or shifter it will only go up or down 1 at a time
+1 - What he said, that's the beauty of these dual clutch boxes, they can "jump" a selection of gears almost instantaneously. :)

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How many gears should the DCT kickdown?

Post by Maniac » Sun Nov 19, 2017 10:10 pm

There’s a difference between foot to the floor and kick down. The latter as above is max acceleration and the former a mix of power and economy.

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How many gears should the DCT kickdown?

Post by Busterboo » Sun Nov 19, 2017 11:56 pm

At 4,000 revs in 5th, for example, in Sport/S (i.e. gear lever to the left), hard kick-down keeps me too busy to count gears.
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sunnydays
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How many gears should the DCT kickdown?

Post by sunnydays » Mon Nov 20, 2017 12:07 am

Thanks for the confirmation everyone. So if I understood correctly in auto mode it will kick down to the lowest possible gear. In manual mode it will kick down 1 gear. Which is probably why i was thinking it only jumps down 1.... lol

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How many gears should the DCT kickdown?

Post by Lazza » Mon Nov 20, 2017 2:55 pm

Kick down will always drop down enough gears to give you max acceleration, regardless of which more you are in.
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How many gears should the DCT kickdown?

Post by Paulr » Mon Nov 20, 2017 3:03 pm

They are governed so they will not self destruct by chucking themselves into first at 80. You cannot put them into reverse whilst going forward either. If you test that and it does go into reverse, I will deny everything.
If you try and take a cat apart the first thing you have is a non working cat.

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