993 Tiptronic question
Rennlist Member
Joined: Dec 2004
Posts: 810
Likes: 16
From: North Tustin, CA
I haven't owned a tip 993 in years.
But I do remember something like that. I believe it starts in 2nd from park and stop. But if you put it in reverse just prior to drive, it will start in 1st. Some sort of weird Porsche thing.
But I do remember something like that. I believe it starts in 2nd from park and stop. But if you put it in reverse just prior to drive, it will start in 1st. Some sort of weird Porsche thing.
Rennlist Member
Joined: Jan 2005
Posts: 1,045
Likes: 20
From: SLC, Utah
Here's a quote from a post I made a few years ago.
The tip system is complex. It takes seven pages in the Factory Repair Manual to describe the operation. In the automatic program the electronic transmission control system selects among 5 different shift point maps from SC1 for "comfortable" driving to SC5 for "very sporting" driving. The inputs are shift selector, throttle position, rpm, speed, lateral acceleration, and longitudinal acceleration.
Here's some stuff plagiarized from the manual.
To go straight to SC5 the "accelerator is depressed suddenly and abruptly".
"When the accelerator is released rapidly ahead of curves (throttle control speed), the control unit detects this driving situation and prevents shifting."
"The transverse acceleration sensor sends a signal to the control unit as soon as vehicle exceeds the transverse acceleration thresholds at which no shifts should be made. The engaged gear then remains selected regardless of any accelerator movement."
The “kickdown latching” allows the max rpm shiftpoints to be used at less than full throttle. “The function is started when the kickdown switch is actuated and the accelerator is released rapidly.” “The kickdown shift speeds remain active until the accelerator is released to 50% of the full-throttle position.”
If you want to start out in first gear instead of second the throttle angle must be >35% in the “D” position or the shift selector must be in “3”, “2”, or “1”.
And on and on with “adaptive pressure control, “uphill and downhill detection”, “warm-up map”, “transmission protection at high ATF temperatures” …
Here's some stuff plagiarized from the manual.
To go straight to SC5 the "accelerator is depressed suddenly and abruptly".
"When the accelerator is released rapidly ahead of curves (throttle control speed), the control unit detects this driving situation and prevents shifting."
"The transverse acceleration sensor sends a signal to the control unit as soon as vehicle exceeds the transverse acceleration thresholds at which no shifts should be made. The engaged gear then remains selected regardless of any accelerator movement."
The “kickdown latching” allows the max rpm shiftpoints to be used at less than full throttle. “The function is started when the kickdown switch is actuated and the accelerator is released rapidly.” “The kickdown shift speeds remain active until the accelerator is released to 50% of the full-throttle position.”
If you want to start out in first gear instead of second the throttle angle must be >35% in the “D” position or the shift selector must be in “3”, “2”, or “1”.
And on and on with “adaptive pressure control, “uphill and downhill detection”, “warm-up map”, “transmission protection at high ATF temperatures” …
Trending Topics
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
2026 Porsche 911 Club Coupe is Spectacular, And Everything Wrong with the Porsche Market
Joe Kucinski
Talos Takes Your 991 Porsche 911 GT3 to the Next Level for a Cool $1.13 Million
Verdad Gallardo
9 Vehicles Porsche Helped Engineer that Aren't Porsches
Verdad Gallardo
9 Features and Characteristics That Only Porsche People Understand
Verdad Gallardo
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way
Joe Kucinski
10 Most Unnecessary Porsches Ever Built (And Why We Love Them)
Verdad Gallardo
Porsche 911 GT3 S/C vs 718 Spyder RS: 10 Categories, One Winner
Joe Kucinski
This Builder Is Turning Heads With Its Slantnose 911 Creation
Verdad Gallardo
Porsche 911 GT3 Artisan Edition Pays Homage to Japanese Culture
Verdad Gallardo
Racer
Joined: Nov 2005
Posts: 252
Likes: 1
From: Hong Kong (and Sydney, Australia)
Peter
D by default starts off in 2nd gear and when you stop it returns to 2nd gear. That is normal. As others have said, in full auto mode, if u want to the system to engage first gear, you need to select 3 or lower gear.
anyway, most of us use the manual mode even on daily drives as the kick down is quite slow.
D by default starts off in 2nd gear and when you stop it returns to 2nd gear. That is normal. As others have said, in full auto mode, if u want to the system to engage first gear, you need to select 3 or lower gear.
anyway, most of us use the manual mode even on daily drives as the kick down is quite slow.
Racer
Joined: Nov 2003
Posts: 444
Likes: 6
From: Sydney Australia
I read here somewhere that there is a way to teach the tip tranny to select 1st when you come to a stop, it involved someting like shifting back to 1st in manual mode as your speed came to 10mph or lower and doing this a number of times. I tried it several times but could never get it to learn.
Bad Porschey, No treat for you...
I have noticed that it sometimes selected 1st from first take off in winter but only a handful of times in all the time I have had it, and never once it has warmed up a little.
Bad Porschey, No treat for you...
I have noticed that it sometimes selected 1st from first take off in winter but only a handful of times in all the time I have had it, and never once it has warmed up a little.
Rennlist Member
Joined: Jan 2005
Posts: 1,045
Likes: 20
From: SLC, Utah
If you want to start out in first gear instead of second the throttle angle must be >35% in the “D” position or the shift selector must be in “3”, “2”, or “1”.
I read here somewhere that there is a way to teach the tip tranny to select 1st when you come to a stop, it involved someting like shifting back to 1st in manual mode as your speed came to 10mph or lower and doing this a number of times. I tried it several times but could never get it to learn.
Bad Porschey, No treat for you...
I have noticed that it sometimes selected 1st from first take off in winter but only a handful of times in all the time I have had it, and never once it has warmed up a little.
Bad Porschey, No treat for you...
I have noticed that it sometimes selected 1st from first take off in winter but only a handful of times in all the time I have had it, and never once it has warmed up a little.
I'll have to look it up again (in the factory repair manual) but I believe 'moving off in second gear' is enabled after 'warm-up'.
