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Thread: PDK - Comments by Owners

  1. #221
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    Re: PDK - Comments by Owners

    Quote Originally Posted by AJK View Post
    What is this "Torque Boost"? Haven't heard of that before.
    +1.........
    Blessed with a sexy, very well spec'd 2014 981 Boxster S [Agate Grey, 6MT, PASM, PTV, SC, LDP, 19" Cayman S Wheels, Full Leather (black), Sport Design Wheel, White Instrument Dials, Burmester (not Burmeister), Premium Pkg, Smoking Pkg, Embossed Head Rests, Ventilated Seats, Custom Gas Cap yada] ... and disabled that f-ing 'beep' 'beep' racket.


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    Re: PDK - Comments by Owners

    When the PDK in Sports Plus shifts close to redline the thing really kicks ya in the back and the car just surges forward...it feels like you are riding a wild animal. I drove the Cayman R in manual...wonderful transmission and I enjoyed it, but to me with a car like this, the PDK was the only choice for me and it matches the incredible performance of the car.

    I absolutely love this transmission...95% of my cars were manuals before this...my trucks/SUV were automatics and I had one Lexus IS300 with "tiptronic" and I absolutely hated that transmission, it was so dull and slow I just left it in auto mode and eventually it became my wife's car. Currently I have 2 manual cars right now, an M5 and a 325 and an automatic X5. I drive the 325 often (M5 sometimes) in the bay area so I have no problem with driving a manual in traffic...and I drive 40,000 miles a year back and forth between Modesto and San Jose for my various construction projects.

    Every time I take my M5 out into the foothills, I always wish I had my PDK in that car and really any manual car I've driven since. I like the manual when I'm just tooling around and driving casually or even some more spirited driving...but the PDK is just so glorious to drive at the edge of the envelop (mostly mine) and to pop the gears down as I enter the corner...hear the FFFFFBAM sound at every gear change, and the kick in my back and snap of my neck when the PDK is racking the gears up close to redline. The 981 is about razor sharp performance in a fast, light-weight package with moderate horsepower...and I think the PDK takes all of the various separate parts and interconnects them into a cohesive and complete package...much more than a manual.

  3. #223
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    Re: PDK - Comments by Owners

    Quote Originally Posted by AJK View Post
    What is this "Torque Boost"? Haven't heard of that before.
    I believe the poster was alluding to the fact that PDK sports mode automatically puts you in the sweet spot of the torque curve at all times. No transmission or software can boost torque in a non-aspirated engine.
    type981s likes this.

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    Re: PDK - Comments by Owners

    it was all manual transmission for me..till i got my behind handed to me in time trials by a PDK...

    so my new moto is ...

    IF YOU CANT DRIVE FAST....."DISPLAY!"

    .So we ordered the next new car in the fleet to be PDK!

    2cents

    Lemon

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    Re: PDK - Comments by Owners

    I put a lot of miles on a friends various PDK Porsches and I still wasn't sold on it, not that I didn't think it rocked though. During this time I had a 986 MT and 987 MT. I decided I wanted to drive my Porsches much more and not just clean and looked at them. I'm in great shape but have a condition with my left hip that a clutch just messes up good and thus I avoided driving a lot.

    Well you can guess the rest from hear. The 987 was sold after only 6 months and in came the 981 PDK. Without PDK being offered I wouldn't have bought a Boxster again. I was inches from buying a 997 Tip and then at the last minute realized I still wanted a Roadster.

    The nice part is I still have the 986 when I want to row. When it isn't rainy I drive like a bat out of hell to the golf course. Now though she is up for sale, it's time to put some money in the house. Someone is going to get a bad as$ 986 with thousands spent on making it a sweet ride.
    2014 958 Diesel
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  6. #226
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    Re: PDK - Comments by Owners

    I discovered today that, while in auto mode & passing cars on the highway, I don't even need to go into manual mode or use the paddles (while in auto mode) to downshift. Just hit the gas pedal!! The farther I push the pedal down, the more downshifts the CPU will give me. And 90 mph seemed to be the average speed at the end of the passing maneuver. That's OK in a 55 mph zone isn't it??
    2014 981 Cayman S delivered 11JUN2013. Aqua Blue over Carrera red, mahogany trim, 20" Carrera S, PASM, PDK, Sport Design (with paddles) steering wheel, PTV, Infotainment, Convenience, Adaptive Plus seats, F&R parking sensors, yellow gauge faces.

  7. #227
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    Re: PDK - Comments by Owners

    Quote Originally Posted by Bluzpwr View Post
    I discovered today that, while in auto mode & passing cars on the highway, I don't even need to go into manual mode or use the paddles (while in auto mode) to downshift. Just hit the gas pedal!! The farther I push the pedal down, the more downshifts the CPU will give me. And 90 mph seemed to be the average speed at the end of the passing maneuver. That's OK in a 55 mph zone isn't it??
    Can't speak for a 981, but in a 987.2 there is an actual switch/button at the end of the gas pedal, if you hit the gas and this switch hits ( you can feel it ) the car will automatically drop to the lowest gear possible for your current speed. This works in auto or manual mode. Great feature that is awesome for all sorts of maneuvers.
    2015 Salsa Red Jaguar F-Type R
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  8. #228
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    Re: PDK - Comments by Owners

    Quote Originally Posted by AJK View Post
    What is this "Torque Boost"? Haven't heard of that before.
    With the optional Sport Chrono Package, PDK is enhanced by the ‘Launch Control’ and ‘motorsport-derived gearshift strategy’ functions for even faster and firmer gear changes and the best possible performance thanks to a boost in torque during upshift phases. Overrun downshifts provide extremely sporty braking and acceleration for added excitement.

    From the Porsche Website.

    2013 981 S 333HP 260 ft-lb Lime Gold, Agate Grey / Lime Gold (Ordered August 2012, Built 1/30/13, Shipped - Grand Pioneer, Arrived Dealer 4/4/13, Delivered 4/12/13 - )
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    DD: 2010 Mercedes Benz E250 CGI Elegance A207 Turbo Cabriolet - Indigo Blue. Past: 1997 986 - Arena Red, 928S 1982, Nissan 300ZX Turbo, Datsun 280 ZX, Honda Coupe 9, Honda S600

  9. #229
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    Re: PDK - Comments by Owners

    Quote Originally Posted by fast1 View Post
    I believe the poster was alluding to the fact that PDK sports mode automatically puts you in the sweet spot of the torque curve at all times. No transmission or software can boost torque in a non-aspirated engine.
    Nope, It appears that there is a ECU tweak in Sports Plus that give a temp power boost just for the change up.

    This engine is all ECU tune. We know the same motor in a 991 base is good for another 35HP and there is more room left in it for later model tweaks in HP.

    Sports mode drops you back to the same revs but the difference between sports and sports plus at the change feel like about an 80 HP difference. It really slams you back in the seat.

    Its a nice feeling.

    robbyp and bybybmw like this.
    2013 981 S 333HP 260 ft-lb Lime Gold, Agate Grey / Lime Gold (Ordered August 2012, Built 1/30/13, Shipped - Grand Pioneer, Arrived Dealer 4/4/13, Delivered 4/12/13 - )
    LG Liberace Mobile #1 Full Specification.
    DD: 2010 Mercedes Benz E250 CGI Elegance A207 Turbo Cabriolet - Indigo Blue. Past: 1997 986 - Arena Red, 928S 1982, Nissan 300ZX Turbo, Datsun 280 ZX, Honda Coupe 9, Honda S600

  10. #230
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    Re: PDK - Comments by Owners

    Interesting, albeit gimmicky.
    Blessed with a sexy, very well spec'd 2014 981 Boxster S [Agate Grey, 6MT, PASM, PTV, SC, LDP, 19" Cayman S Wheels, Full Leather (black), Sport Design Wheel, White Instrument Dials, Burmester (not Burmeister), Premium Pkg, Smoking Pkg, Embossed Head Rests, Ventilated Seats, Custom Gas Cap yada] ... and disabled that f-ing 'beep' 'beep' racket.

  11. #231
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    Re: PDK - Comments by Owners

    Quote Originally Posted by BJR View Post
    Nope, It appears that there is a ECU tweak in Sports Plus that give a temp power boost just for the change up.

    This engine is all ECU tune. We know the same motor in a 991 base is good for another 35HP and there is more room left in it for later model tweaks in HP.

    Sports mode drops you back to the same revs but the difference between sports and sports plus at the change feel like about an 80 HP difference. It really slams you back in the seat.

    Its a nice feeling.

    Increasing HP in an engine that has been detuned, isn't that difficult. You simply reset the rev limiter a few hundred rpm higher to allow the engine to reach its true max HP. Increasing torque in a turbo charged engine is not that difficult. You just increase the boost. Neither one of these methods will promote engine longevity, but they will produce more power.

    Now increasing torque in a non-aspirated engine without making a physical change like increasing the bore or storke or redesigning the head to increase engine efficiency is a lot more challenging.

    To use your term, "ECU tweak", may allow peak engine power and torque to arrive sooner than in a standard, un-remapped engine. High engine revs become unnecessary because the engine is producing the same or higher power output at a lower rpm. Since most drivers will typically use the mid rev range, they will readily see a performance improvement.

    Another method would be to remove some impediment that Porsche has introduced in the 981 engine in order to artifically diminish an engine's output. The engines used in the 991 and 981 are the same, but the one in the 991 produces 30 more HP. So the "ECU tweak" may make the output of the 981 engine the same as the 991.
    bybybmw likes this.

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    Re: PDK - Comments by Owners

    Quote Originally Posted by BJR View Post
    With the optional Sport Chrono Package, PDK is enhanced by the ‘Launch Control’ and ‘motorsport-derived gearshift strategy’ functions for even faster and firmer gear changes and the best possible performance thanks to a boost in torque during upshift phases. Overrun downshifts provide extremely sporty braking and acceleration for added excitement.

    From the Porsche Website.

    Thanks. This gives credance to the belief that the differance between the outputs of a 981 and 991 engine is simply a software change. If marketing dictates that the 991 has to have more power than the 981, an ECU remapping would be the simpliest and least expensive metod to achieve that objective.
    bybybmw likes this.

  13. #233
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    Re: PDK - Comments by Owners

    Quote Originally Posted by fast1 View Post
    Increasing HP in an engine that has been detuned, isn't that difficult. You simply reset the rev limiter a few hundred rpm higher to allow the engine to reach its true max HP. Increasing torque in a turbo charged engine is not that difficult. You just increase the boost. Neither one of these methods will promote engine longevity, but they will produce more power.

    Now increasing torque in a non-aspirated engine without making a physical change like increasing the bore or storke or redesigning the head to increase engine efficiency is a lot more challenging.

    To use your term, "ECU tweak", may allow peak engine power and torque to arrive sooner than in a standard, un-remapped engine. High engine revs become unnecessary because the engine is producing the same or higher power output at a lower rpm. Since most drivers will typically use the mid rev range, they will readily see a performance improvement.

    Another method would be to remove some impediment that Porsche has introduced in the 981 engine in order to artifically diminish an engine's output. The engines used in the 991 and 981 are the same, but the one in the 991 produces 30 more HP. So the "ECU tweak" may make the output of the 981 engine the same as the 991.
    Hmmm, I would to see where it is confirmed that the 991 and 981 engines are 'exactly' the same with only the ECU making the difference...

    I suspect that there may other physical differences at work here, I suggest that the 991 engine could have different heads (ported, possibly different valve sizes), intake tract, the cam profiles could be different, how about the compression ratio and due to the engine bay differences the exhaust headers could also be unique.

    Sure the ECU can do amazing things and as it has been mentioned, especially in a turbo charged engine, but for same displacement naturally aspirated engines to go from 315 to 350 HP you generally need to make some definitive changes like those I mention.

    I have no doubt that a 981 engine can produce 350 HP, but I doubt that an ECU tweak is the 'complete' answer.

    Just look at what BJR has changed in his engine along with some ECU work to go from 315 to 333 HP, there is a synergy required for the system to reach each new level of HP.
    Al
    2013 981-S in DMB over Agate Grey leather with 6MT, PASM,PTV,SC,PCM and more... Born March 8th in Stuttgart, embarking on the Paradise Ace in Emden March 18, arrived in Halifax March 29 delivery April 27th... now with Fabspeed V2 cat-back exhaust and smartTOP remote control.

  14. #234
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    Re: PDK - Comments by Owners

    Quote Originally Posted by Bluzpwr View Post
    I discovered today that, while in auto mode & passing cars on the highway, I don't even need to go into manual mode or use the paddles (while in auto mode) to downshift. Just hit the gas pedal!! The farther I push the pedal down, the more downshifts the CPU will give me. And 90 mph seemed to be the average speed at the end of the passing maneuver. That's OK in a 55 mph zone isn't it??
    90? 90? I always seem to see at least 3 digits when I am done passing.
    2013 Boxster S / PDK / Plat. Silver w Black Int. / 20" Carrera S Wheels

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    Re: PDK - Comments by Owners

    Quote Originally Posted by Westcoaster View Post
    Hmmm, I would to see where it is confirmed that the 991 and 981 engines are 'exactly' the same with only the ECU making the difference...

    I suspect that there may other physical differences at work here, I suggest that the 991 engine could have different heads (ported, possibly different valve sizes), intake tract, the cam profiles could be different, how about the compression ratio and due to the engine bay differences the exhaust headers could also be unique.

    Sure the ECU can do amazing things and as it has been mentioned, especially in a turbo charged engine, but for same displacement naturally aspirated engines to go from 315 to 350 HP you generally need to make some definitive changes like those I mention.

    I have no doubt that a 981 engine can produce 350 HP, but I doubt that an ECU tweak is the 'complete' answer.

    Just look at what BJR has changed in his engine along with some ECU work to go from 315 to 333 HP, there is a synergy required for the system to reach each new level of HP.
    ...Unless it's the other way around and the 981 engines are "ECU detuned" versions of the 991's...
    Just saying...


    Cheers,
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    Re: PDK - Comments by Owners

    Quote Originally Posted by numberone View Post
    ...unless it's the other way around and the 981 engines are "ecu detuned" and hardware crippled versions of the 991's...
    Blessed with a sexy, very well spec'd 2014 981 Boxster S [Agate Grey, 6MT, PASM, PTV, SC, LDP, 19" Cayman S Wheels, Full Leather (black), Sport Design Wheel, White Instrument Dials, Burmester (not Burmeister), Premium Pkg, Smoking Pkg, Embossed Head Rests, Ventilated Seats, Custom Gas Cap yada] ... and disabled that f-ing 'beep' 'beep' racket.

  17. #237
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    Re: PDK - Comments by Owners

    Hmmm, I would to see where it is confirmed that the 991 and 981 engines are 'exactly' the same with only the ECU making the difference...

    That's a closely guarded secret, but let's look at what we do know.
    1.The blocks and the displacement of the engines in the 981 and 991 are the same. The heads could be different, I don't know.
    2. 981 engines with PDK and Sports chrono can get a boost in torque according to Porsche and verified by PDK owners.

    Although Porsche doesn't specify how much the torque boost is, it certainly is enough to be noticeable by PDK owners, and quite possibly up to the level of a 991. Also, in order to keep costs down, it's likely that Porsche would offer the same engine in both cars, especially if they could keep maintain the 981/991 power differance by an ECU tune. So based on the preceeding, I think it's likely the engine hardware for the two cars are the same, and the power differance comes from an ECU tune.
    BJR likes this.

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    Re: PDK - Comments by Owners

    Torque Boost?

    Porsche says, "Porsche Doppelkupplung (PDK) is geared up for the shortest possible shift times and optimum shift points, while torque boosts during gear changes provide the maximum acceleration available. "

    It may be that "torque boosts DURING gear changes" means that Sport Plus increases the engine speed during the short interval during the gear shift when both PDK clutches are only partially engaged. This would give a feeling of acceleration (and a small bit of real acceleration) when the higher gear clutch fully engaged. It's simple, has no cost (to Porsche), and provides the driver sensation that people feel with full throttle Sport Plus upshifts.

    A bit of the "scratch in 2nd gear" that we enjoyed in high school.

    It does seem like Porsche's alternative to playing exhaust sounds through the stereo.
    fast1 likes this.

  19. #239
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    Re: PDK - Comments by Owners

    Quote Originally Posted by hansgm View Post
    It does seem like Porsche's alternative to playing exhaust sounds through the stereo.
    yep.......
    Blessed with a sexy, very well spec'd 2014 981 Boxster S [Agate Grey, 6MT, PASM, PTV, SC, LDP, 19" Cayman S Wheels, Full Leather (black), Sport Design Wheel, White Instrument Dials, Burmester (not Burmeister), Premium Pkg, Smoking Pkg, Embossed Head Rests, Ventilated Seats, Custom Gas Cap yada] ... and disabled that f-ing 'beep' 'beep' racket.

  20. #240
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    Re: PDK - Comments by Owners

    "With the optional Sport Chrono Package, PDK is enhanced by the ‘Launch Control’ and ‘motorsport-derived gearshift strategy’ functions for even faster and firmer gear changes and the best possible performance thanks to a boost in torque during upshift phases. Overrun downshifts provide extremely sporty braking and acceleration for added excitement.

    From the Porsche Website."

    I have a cayman r with pdk and sport chrono plus and their is a significant and rather extreme difference between sport and sport plus modes. I've heard others claim that the sport and sport + modes only change throttle response meaning that it takes less of a push of the throttle to get more rpms. While this is true the shifting with pdk and sport chrono plus is more than just the result of increased throttle response. I think what is happening is a combination of 3 things . 1. the engine revving to the highest possible rpm to and as close to redline as possible(something that cant be replicated using the pdk paddles and a higher rpm than sport mode)2. some type of mechanical increase of torque that the transmission provides in this mode. This is the kick in the back that is unique to pdk and sport plus modes. All of you with pdk and sport chrono plus will know what im talking about. 3. The pdk shifts gears quicker in sport plus modes. Fewer millisecond shifts . This is my opinion of what's happening .

    Anyway, I love the pdk. Shifts super fast,sounds amazing, and is more fun than anything else I've ever driven! I actually use the paddles when cruising and when going for a spirited drive use the auto sport plus mode bc it does make the car much faster and more exciting in my opinion.
    fast1 likes this.
    Shawn

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