Cayenne hesitation....learn to live with it
08-17-2005, 04:13 PM
#16
Super Moderator
Needs More Cowbell
Lifetime Rennlist
Member
Needs More Cowbell
Lifetime Rennlist
Member
Thread Starter
rome,
There was a recent Panorama article (996TT Tip vs 6spd) by Walter Rohrl that had a very good description of the modern Tiptronic gearbox.
IIRC, there were something like 200 software 'patterns' algorithmically available to control the transmission in response to various inputs: temperature, rpm, ABS, eGas/throttle position, DRIVING habits (yes, really), etc.
Basically the Tiptronic will adapt its shift points in reponse to what it believes wil be current driving conditions based on past inputs.
The DME works in a similar fashion, although much more strictly controlled due to the nature of controlling an engine/ emissions, etc
Since PSM is tied into the DME and Tiptronic (via CAN bus), there will be different algorithms initially applied based on the car's 'understanding' that by disabling PSM, there will be 'spirited driving'; so the transmission may start out in D1 rather than D2, the eGas curves will be altered, etc....the end result being less perceived throttle hesitation lag (throw in turbo lag and spool ups just to further complicate engine management matters if you want to).
Now, if you drive long enough with PSM off, the Tiptronic control unit will begin to 'adapt' to this as your 'normal' driving........however, if you drive very conservatively, PSM on, trying to maximize fuel economy, you will end up with a different vehicle response.
Simple, huh?
There was a recent Panorama article (996TT Tip vs 6spd) by Walter Rohrl that had a very good description of the modern Tiptronic gearbox.
IIRC, there were something like 200 software 'patterns' algorithmically available to control the transmission in response to various inputs: temperature, rpm, ABS, eGas/throttle position, DRIVING habits (yes, really), etc.
Basically the Tiptronic will adapt its shift points in reponse to what it believes wil be current driving conditions based on past inputs.
The DME works in a similar fashion, although much more strictly controlled due to the nature of controlling an engine/ emissions, etc
Since PSM is tied into the DME and Tiptronic (via CAN bus), there will be different algorithms initially applied based on the car's 'understanding' that by disabling PSM, there will be 'spirited driving'; so the transmission may start out in D1 rather than D2, the eGas curves will be altered, etc....the end result being less perceived throttle hesitation lag (throw in turbo lag and spool ups just to further complicate engine management matters if you want to).
Now, if you drive long enough with PSM off, the Tiptronic control unit will begin to 'adapt' to this as your 'normal' driving........however, if you drive very conservatively, PSM on, trying to maximize fuel economy, you will end up with a different vehicle response.
Simple, huh?
08-17-2005, 04:16 PM
#17
Super Moderator
Needs More Cowbell
Lifetime Rennlist
Member
Needs More Cowbell
Lifetime Rennlist
Member
Thread Starter
Originally Posted by mudman2
You don't need to be, its really something that is easy to live with, is it perfect ?, no, but what is ?, the "!"
Superman had Kryptonite, I get stuck with "!". Fine.
Originally Posted by mudman2
They did not have the ( ! )
Originally Posted by mudman2
Sorry rome a couple of in jokes may float over you for now.
P.S. NO, I'm NOT sharing my Purplesaurus Rex with the new guys......
08-17-2005, 04:32 PM
#19
Rennlist Member
Join Date: Aug 2005
Location: North Shore
Posts: 3,984
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ltc
rome,
There was a recent Panorama article (996TT Tip vs 6spd) by Walter Rohrl that had a very good description of the modern Tiptronic gearbox.
IIRC, there were something like 200 software 'patterns' algorithmically available to control the transmission in response to various inputs: temperature, rpm, ABS, eGas/throttle position, DRIVING habits (yes, really), etc.
Basically the Tiptronic will adapt its shift points in reponse to what it believes wil be current driving conditions based on past inputs.
The DME works in a similar fashion, although much more strictly controlled due to the nature of controlling an engine/ emissions, etc
Since PSM is tied into the DME and Tiptronic (via CAN bus), there will be different algorithms initially applied based on the car's 'understanding' that by disabling PSM, there will be 'spirited driving'; so the transmission may start out in D1 rather than D2, the eGas curves will be altered, etc....the end result being less perceived throttle hesitation lag (throw in turbo lag and spool ups just to further complicate engine management matters if you want to).
Now, if you drive long enough with PSM off, the Tiptronic control unit will begin to 'adapt' to this as your 'normal' driving........however, if you drive very conservatively, PSM on, trying to maximize fuel economy, you will end up with a different vehicle response.
Simple, huh?
There was a recent Panorama article (996TT Tip vs 6spd) by Walter Rohrl that had a very good description of the modern Tiptronic gearbox.
IIRC, there were something like 200 software 'patterns' algorithmically available to control the transmission in response to various inputs: temperature, rpm, ABS, eGas/throttle position, DRIVING habits (yes, really), etc.
Basically the Tiptronic will adapt its shift points in reponse to what it believes wil be current driving conditions based on past inputs.
The DME works in a similar fashion, although much more strictly controlled due to the nature of controlling an engine/ emissions, etc
Since PSM is tied into the DME and Tiptronic (via CAN bus), there will be different algorithms initially applied based on the car's 'understanding' that by disabling PSM, there will be 'spirited driving'; so the transmission may start out in D1 rather than D2, the eGas curves will be altered, etc....the end result being less perceived throttle hesitation lag (throw in turbo lag and spool ups just to further complicate engine management matters if you want to).
Now, if you drive long enough with PSM off, the Tiptronic control unit will begin to 'adapt' to this as your 'normal' driving........however, if you drive very conservatively, PSM on, trying to maximize fuel economy, you will end up with a different vehicle response.
Simple, huh?
Is there any good reason to keep it "on" otherwise?
08-17-2005, 04:37 PM
#20
Moderator !x4
Well there is a reason, if your commuting, you will most certainly spill your coffee, the so called "lurch".
OK if its only you (you can drive home and change) but if your significant other is the passenger thats another issue.
Then the PSM on can give pretty smooth responses.
OK if its only you (you can drive home and change) but if your significant other is the passenger thats another issue.
Then the PSM on can give pretty smooth responses.
08-17-2005, 05:30 PM
#21
Addict
Rennlist Member
Rennlist Member
Join Date: Dec 2001
Location: MA
Posts: 1,010
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ltc
rome,
There was a recent Panorama article (996TT Tip vs 6spd) by Walter Rohrl that had a very good description of the modern Tiptronic gearbox.
IIRC, there were something like 200 software 'patterns' algorithmically available to control the transmission in response to various inputs: temperature, rpm, ABS, eGas/throttle position, DRIVING habits (yes, really), etc.
Basically the Tiptronic will adapt its shift points in reponse to what it believes wil be current driving conditions based on past inputs.
The DME works in a similar fashion, although much more strictly controlled due to the nature of controlling an engine/ emissions, etc
Since PSM is tied into the DME and Tiptronic (via CAN bus), there will be different algorithms initially applied based on the car's 'understanding' that by disabling PSM, there will be 'spirited driving'; so the transmission may start out in D1 rather than D2, the eGas curves will be altered, etc....the end result being less perceived throttle hesitation lag (throw in turbo lag and spool ups just to further complicate engine management matters if you want to).
Now, if you drive long enough with PSM off, the Tiptronic control unit will begin to 'adapt' to this as your 'normal' driving........however, if you drive very conservatively, PSM on, trying to maximize fuel economy, you will end up with a different vehicle response.
Simple, huh?
There was a recent Panorama article (996TT Tip vs 6spd) by Walter Rohrl that had a very good description of the modern Tiptronic gearbox.
IIRC, there were something like 200 software 'patterns' algorithmically available to control the transmission in response to various inputs: temperature, rpm, ABS, eGas/throttle position, DRIVING habits (yes, really), etc.
Basically the Tiptronic will adapt its shift points in reponse to what it believes wil be current driving conditions based on past inputs.
The DME works in a similar fashion, although much more strictly controlled due to the nature of controlling an engine/ emissions, etc
Since PSM is tied into the DME and Tiptronic (via CAN bus), there will be different algorithms initially applied based on the car's 'understanding' that by disabling PSM, there will be 'spirited driving'; so the transmission may start out in D1 rather than D2, the eGas curves will be altered, etc....the end result being less perceived throttle hesitation lag (throw in turbo lag and spool ups just to further complicate engine management matters if you want to).
Now, if you drive long enough with PSM off, the Tiptronic control unit will begin to 'adapt' to this as your 'normal' driving........however, if you drive very conservatively, PSM on, trying to maximize fuel economy, you will end up with a different vehicle response.
Simple, huh?
08-17-2005, 05:58 PM
#23
Instructor
Join Date: Jan 2005
Location: St. Augustine, Fl
Posts: 169
Likes: 0
Received 0 Likes
on
0 Posts
Quote
"Hmmm... so what the heck happens when you add a trailer into the mix? I'm think of getting one as a tow vehicle, does this exacerbate the problem?"
Nothing to the response but you will see !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!, Just ask Lewis.
Pass the kool-aid
"Hmmm... so what the heck happens when you add a trailer into the mix? I'm think of getting one as a tow vehicle, does this exacerbate the problem?"
Nothing to the response but you will see !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!, Just ask Lewis.
Pass the kool-aid
08-17-2005, 06:23 PM
#26
Official Wednesday AM Red Bull F1 test driver
Rennlist Member
Rennlist Member
Yes, if towing you should be in manual mode. I rarely hit 6th when towing. Maybe on level ground or downhill. Lewis and I both wonder if anyone towing with an enclosed car trailer can get it to work the lights without the famous ! and the "check trailer lights" message????? I could only get it to work properly with a small single axle enclosed go-kart trailer...
08-17-2005, 06:27 PM
#27
Addict
Rennlist Member
Rennlist Member
Join Date: Dec 2001
Location: MA
Posts: 1,010
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by thecleaner
Quote
"Hmmm... so what the heck happens when you add a trailer into the mix? I'm think of getting one as a tow vehicle, does this exacerbate the problem?"
Nothing to the response but you will see !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!, Just ask Lewis.
Pass the kool-aid
"Hmmm... so what the heck happens when you add a trailer into the mix? I'm think of getting one as a tow vehicle, does this exacerbate the problem?"
Nothing to the response but you will see !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!, Just ask Lewis.
Pass the kool-aid
08-17-2005, 06:45 PM
#28
Pepper Bartender
Rennlist Member
Rennlist Member
Originally Posted by mudman2
You crack me up ! :-)
08-17-2005, 07:13 PM
#29
Nordschleife Master
hmmm, hesitation ? Don't have that. Ocassional vibration with 20's yes. Choice between the two Cayenne driving characteristics(LOL)..I will take the "good" vibrations.... 