Weird DCT downshift! Help!

sahanMpower · 03-27-2024, 12:36 PM

Hey guys, I’m having this weird downshift that happen sometimes and what cause of it?

Mine is on SC and SSP clutch.

Here the video;

https://youtube.com/shorts/cnj07rC7A...5ZJFW-iEpjuYGm

sahanMpower · 03-28-2024, 04:26 PM

bump

M3SQRD · 03-29-2024, 03:35 PM

You’re basically running the motor at the lowest possible rpm in each gear to match road speed at 1k rpm between gears as you come to a stop. It seems the required throttle blips barely, if at all, raises the rpm to engage the next lower gear. It’s almost like it initially applied too little throttle and has to blip the throttle a second time to better match rpm-speed between gears. Is there a reason why you’re inching along at such slow speeds requiring repeated downshifts at 1k rpm?

Does it do this if you repeatedly pull the downshift paddle at, say, 2k rpm as you come to a normal stop? Not sure if this is a real problem or if it’s the DCT TCU having trouble matching speed and rpm between downshifts at 1k rpm?

03-27-2024, 12:36 PM	#1
sahanMpower Private First Class 19 Rep 141 Posts Drives: E92 M3 S/C STAGE 2 Join Date: Jul 2011 Location: San Clemente, CA iTrader: (0)	Weird DCT downshift! Help! Hey guys, I’m having this weird downshift that happen sometimes and what cause of it? Mine is on SC and SSP clutch. Here the video; https://youtube.com/shorts/cnj07rC7A...5ZJFW-iEpjuYGm Last edited by sahanMpower; 03-27-2024 at 12:41 PM..
	Appreciate 0 Tweet Quote

03-28-2024, 04:26 PM	#2
sahanMpower Private First Class 19 Rep 141 Posts Drives: E92 M3 S/C STAGE 2 Join Date: Jul 2011 Location: San Clemente, CA iTrader: (0)	bump
	Appreciate 0 Quote

03-29-2024, 03:35 PM	#3
M3SQRD Major General 2097 Rep 5,491 Posts Drives: E92 M3,G20 330ix,F22 240iX,F82 Join Date: Jun 2009 Location: Mid-Atlantic iTrader: (11)	You’re basically running the motor at the lowest possible rpm in each gear to match road speed at 1k rpm between gears as you come to a stop. It seems the required throttle blips barely, if at all, raises the rpm to engage the next lower gear. It’s almost like it initially applied too little throttle and has to blip the throttle a second time to better match rpm-speed between gears. Is there a reason why you’re inching along at such slow speeds requiring repeated downshifts at 1k rpm? Does it do this if you repeatedly pull the downshift paddle at, say, 2k rpm as you come to a normal stop? Not sure if this is a real problem or if it’s the DCT TCU having trouble matching speed and rpm between downshifts at 1k rpm?
	Appreciate 0 Quote