Notices
997 Forum 2005-2012
Sponsored by:
Sponsored by:

PDK questions re: automatic shifting and kickdown

Thread Tools
 
Search this Thread
 
Old May 5, 2011 | 11:42 AM
  #1  
JasonNY's Avatar
JasonNY
Thread Starter
Instructor
 
Joined: Jun 2004
Posts: 131
Likes: 1
Default PDK questions re: automatic shifting and kickdown

Seemed to find some answers w/ search on kickdown but not on if you can disable the computer from automatically upshifting when it reaches redline. On a C2S is there a way to override in sport or sport plus mode the computer from shifting automatically, i.e. keep it completely manual control for the driver? Also i've read here about the kickdown pedal button and curious if that always downshifts when "clicked" in all modes. Thanks.
Reply
Old May 5, 2011 | 01:33 PM
  #2  
wwest's Avatar
wwest
Drifting
 
Joined: Sep 2001
Posts: 2,467
Likes: 16
From: redmond wa
Default

"..disable the computer from automatically upshifting..."

To accomplish what, continuous rev-limiter activation...?

"..always downshifts when "clicked"..."

That would be a bit foolish, self-destructing DSG or engine..?
Reply
Old May 5, 2011 | 02:03 PM
  #3  
JasonNY's Avatar
JasonNY
Thread Starter
Instructor
 
Joined: Jun 2004
Posts: 131
Likes: 1
Default

Originally Posted by wwest
"..disable the computer from automatically upshifting..."

To accomplish what, continuous rev-limiter activation...?

So the answer then is there is no way to disable the computer from upshifting automatically?
Reply
Old May 5, 2011 | 02:35 PM
  #4  
Dr.Bill's Avatar
Dr.Bill
Race Car
 
Joined: Jan 2008
Posts: 4,689
Likes: 736
From: Scottsdale, AZ
Default

Well, you can put it in 'manual' mode. Then it won't upshift at redline. Or, just drive around in circles - I believe it won't shift in a corner. Otherwise, the computer will shift when appropriate, such as at redline.

And the whole purpose of the 'kickdown' mode is to drop down a few gears into the appropriate gear for rapid acceleration given your current speed. So yes, if you activate the 'kickdown' mode, it will downshift. (sort of what the 'down' in 'kickdown' means) In 'sport' or 'sport plus' modes, it may drop to a lower gear than it would in 'normal' mode, but it will downshift unless you are in 1st gear.
Reply
Old May 5, 2011 | 04:14 PM
  #5  
rodsky's Avatar
rodsky
Rennlist Member
15 Year Member
 
Joined: Mar 2007
Posts: 4,149
Likes: 936
From: Manhattan Beach & Truckee, CA
Default

it wont up shift if you're in manual. it just bounces off the limiter. thats why its called manual not trying to be snotty.

if you dont want kickdown - dont depress past the click which activates it.
Reply
Old May 5, 2011 | 04:32 PM
  #6  
gpjli2's Avatar
gpjli2
Three Wheelin'
 
Joined: Feb 2006
Posts: 1,412
Likes: 4
Default

Originally Posted by JasonNY
Seemed to find some answers w/ search on kickdown but not on if you can disable the computer from automatically upshifting when it reaches redline. On a C2S is there a way to override in sport or sport plus mode the computer from shifting automatically, i.e. keep it completely manual control for the driver? Also i've read here about the kickdown pedal button and curious if that always downshifts when "clicked" in all modes. Thanks.
No matter what you do it is an automatic transmission, for better or worse. One of the better features is that it will resist the drivers attempts to destroy it's engine. You should probably be grateful for that.
Reply
Old May 5, 2011 | 05:42 PM
  #7  
pcostinha's Avatar
pcostinha
Track Day
 
Joined: Apr 2011
Posts: 19
Likes: 0
Default

Originally Posted by gpjli2
No matter what you do it is an automatic transmission, for better or worse. One of the better features is that it will resist the drivers attempts to destroy it's engine. You should probably be grateful for that.
I agree. Is the way to protect the engine.
Guys you remember the problems of the carrera 996? A lot of engines have problems because the drivers exceed the max rpm.
Reply
Old May 5, 2011 | 05:56 PM
  #8  
JasonNY's Avatar
JasonNY
Thread Starter
Instructor
 
Joined: Jun 2004
Posts: 131
Likes: 1
Default

Originally Posted by rodsky
it wont up shift if you're in manual. it just bounces off the limiter. thats why its called manual not trying to be snotty.

if you dont want kickdown - dont depress past the click which activates it.
Thanks. That's what I was referring to, in manual mode. Some similar systems still upshift automatically in manual mode unless you're in some sort of sport or race mode as well, is why I asked.
Reply
Old May 5, 2011 | 06:25 PM
  #9  
sjfehr's Avatar
sjfehr
Drifting
15 Year Member
 
Joined: Jan 2009
Posts: 3,042
Likes: 84
From: Chesapeake, VA
Default

Tip will automatically upshift at the redline, which I actually quite like- saves the trouble of having to precision-time redline shifts. Why doesn't PDK do the same?
Reply
Old May 5, 2011 | 06:55 PM
  #10  
Dr.Bill's Avatar
Dr.Bill
Race Car
 
Joined: Jan 2008
Posts: 4,689
Likes: 736
From: Scottsdale, AZ
Default

Originally Posted by sjfehr
Tip will automatically upshift at the redline, which I actually quite like- saves the trouble of having to precision-time redline shifts. Why doesn't PDK do the same?
It will - in Sport Plus mode.
Reply
Old May 5, 2011 | 06:58 PM
  #11  
JasonNY's Avatar
JasonNY
Thread Starter
Instructor
 
Joined: Jun 2004
Posts: 131
Likes: 1
Default

Originally Posted by RayDBonz
It will - in Sport Plus mode.
Interesting, so in manual setting with Sport Plus on the car shifts at redline automatically with PDK? Is sport plus the mode that gives faster shift times with PDK or is that the regular sport mode?
Reply
Old May 5, 2011 | 07:13 PM
  #12  
stevepow's Avatar
stevepow
Three Wheelin'
15 Year Member
 
Joined: Jun 2009
Posts: 1,835
Likes: 17
From: ATL
Default

Originally Posted by JasonNY
Interesting, so in manual setting with Sport Plus on the car shifts at redline automatically with PDK? Is sport plus the mode that gives faster shift times with PDK or is that the regular sport mode?
No - in Manual, the only AUTO shifts are downshifts when stopping and downshift on kickdown. All this is in the Manual plus a lot more. It is really worth reading if you have a PDK car.

There's also a PDF around on the WEB you can look for called "2009_Technik_Introduction_All_997_Carrera_models" that goes into even more detail.

Sport Plus in Auto will not shift until redline or very close.
Reply
Old May 6, 2011 | 05:16 PM
  #13  
wwest's Avatar
wwest
Drifting
 
Joined: Sep 2001
Posts: 2,467
Likes: 16
From: redmond wa
Default

Originally Posted by RayDBonz
Well, you can put it in 'manual' mode. Then it won't upshift at redline. Or, just drive around in circles - I believe it won't shift in a corner. Otherwise, the computer will shift when appropriate, such as at redline.

And the whole purpose of the 'kickdown' mode is to drop down a few gears into the appropriate gear for rapid acceleration given your current speed. So yes, if you activate the 'kickdown' mode, it will downshift. (sort of what the 'down' in 'kickdown' means) In 'sport' or 'sport plus' modes, it may drop to a lower gear than it would in 'normal' mode, but it will downshift unless you are in 1st gear.
"..the whole purpose.."

No, the ECU firmware for automatic transmissions will "kick-down" if the engine begins to knock/ping due to "lugging". It will also kick down automatically if the parametric, "learned", memory indicates the region you wish to operate in, say staying in a tall gear as you begin up an incline, will be detrimental, engine or transmission
Reply
Old May 6, 2011 | 05:20 PM
  #14  
wwest's Avatar
wwest
Drifting
 
Joined: Sep 2001
Posts: 2,467
Likes: 16
From: redmond wa
Default

Again, why would anyone wish to "nuzzle" along at red-line at the rev-limiter "limit"...?

Except maybe top gear, top speed...?

What am I missing here...?
Reply
Old May 6, 2011 | 05:30 PM
  #15  
JasonNY's Avatar
JasonNY
Thread Starter
Instructor
 
Joined: Jun 2004
Posts: 131
Likes: 1
Default

Originally Posted by wwest
Again, why would anyone wish to "nuzzle" along at red-line at the rev-limiter "limit"...?

Except maybe top gear, top speed...?

What am I missing here...?
It's only to avoid double upshifting, i.e. full throttle condition, computer shifts a split second before you pull the paddle and the result is the transmission goes up two gears instead of one.
Reply



All times are GMT -3. The time now is 03:37 AM.