Examine the Core – Performance - Coochascoochas.com/docs/997Mk2-PDK.pdf · 2010-01-27 · Examine the Core: Performance Explore the Core Module 2 Page 4 of 24 • high efficiency

Explore the Core Module 2 Page 1 of 24Examine the Core: Performance

Examine the Core – Performance

HighlightsEngine and EnvironmentTransmission and PDK


Transmission and PDK


1984: Worldwide first use of PDK in Porsche 956

1984: Supercup-race win on Nürburgring in Porsche 962

1986: Biggest success: First Place in world champions run of Monza in Porsche 962

2008:Improvements in computerized controls bring dual clutch technology to comfort/performance balance required in a Porsche passenger vehicle.

Transmission and PDKPorsche History: Pioneers of Dual Clutch Technology

2.10


• high efficiency• high flexibility in selection of

gear ratio for modular systems• low weight

• automatic drive off and shifting• shifting without power loss

(no traction loss on wheels)• high comfort

Automatic Transmission Manual Transmission

PDK combines the advantages of automatic and manual transmissions

Development Targets


2.10


Betterperformance

Greater comfort

Transmission and PDKDevelopment Targets

2.10


…with further increases in performance and dynamics through:

• Direct engine connection – no torque converter• Lower system weight compared to Tiptronic• Limited slip differential (Option C2/Standard C4)• Gear shifting without interruption in force on wheels• Very short gear change times, use of inertia

(rotating energy) during shifting• Improved acceleration from higher starting engine

RPM and slip-regulated Launch Control function


Better performance

Development Targets

2.10


While simultaneously improving comfort when:• Creeping• Drive-off• Shifting gears


Greater comfort

Development Targets

2.10


engine

front axle

four wheel drive models

multi-disc wet clutch 1

partial transmission 1(1, 3, 5, 7, R Gears)

multi-disc wet clutch 2

differentialrear wheel

rear

whe

el

partial transmission 2(2, 4, 6 Gears)

4 62

R 1

37 5

System Design

7 – speed configuration


2.11


Multi-disk wetclutches

Oil pump Partial transmission 2 Partial transmission 1

Main shaft

Parking lock

Pinion shaftDivided oil chambers

4.G 6.G 2.G R.G 3.G 7.G 5.G

Constant gear

1.G

System DesignTransmission and PDK

2.11


Clutch 2

Input Shaft 1

Input Shaft 2

Clutch 1Transmission and PDKDual Clutch Design

• Shift without interruption in drive force• Transfer of power flow from Clutch 1 to

Clutch 2• Two different transmissions in one – each

with its own wet clutch• Larger clutch for gears R,1,3,5,7• Smaller clutch for gears 2,4,6• Hydraulic (not mechanical) gear change• Next gear always on stand-by with low

hydraulic pressure (gear selected has high pressure)

• Two gears always engaged (Driver only feels switching of clutches)

2.11


Engine

First gear

Rear axle

Clutch 1

Transmission Operation • Power flow in first gear



Engine

Fourth gear

Rear axle

Transmission Operation• Power flow in fourth gear

Clutch 2



Aerodynamics / Thermodynamics

• Gear-set oil cooling• Convective (circulatory motion)• Optimized air intakes in underbody

paneling• Low drag• Less lift on rear axle

• Clutch oil cooling• Oil-water heat exchanger on transmission

(center radiator omitted) • PDK runs cooler than Tiptronic (thus, no

need for center radiator)

Center Radiator Eliminated

Cooling-Air Intakes

*Front apron air management improved drivetrain cooling factor by 20%


2.11


Cluster Display1. Selector-lever position2. Driving mode gear

display

Selector Lever1. Right Gate: Automatic2. Left Gate: Manual3. Back for Downshift4. Forward for Upshift

SPORT & SPORT PLUS buttons

Steering Wheel

Rocker Switches

Controls


2.12


Gea

rshi

ft C

omfo

rt

SPORT PLUS mode

EntryNormal mode

SPORTmode

Sportiness

Comfort orientedComfort oriented

Performance oriented

Performance oriented

Entry SPORT mode

Driving Experience 1. Sportier feel, overall vs. Tiptronic

2. Extreme “race track bias” in Sport Plus


2.13


- approximately 1.5 mph faster than PDK Normal Mode

In SPORT PLUS mode, utilizing Launch Control, the PDK vehicle can reach 124 mph ...

approx. 12.2 m = 2.8 vehicles

- 0.4 seconds earlier than in PDK Normal Mode

- Corresponds to a vehicle lead of:

Enhancing Performance :

Comparison of 911 Carrera PDK Normal versus SPORT PLUS (acceleration 0 – 124 mph)


2.13


- Approximately 11 mph faster than Tiptronic S

In SPORT PLUS mode, utilizing Launch Control, a PDK vehicle can reach 124 mph ...

approx. 59.6 m = 13.5 vehicles

- 3.7 seconds earlier than Tiptronic S

- Corresponds to a vehicle lead of:

Enhancing Performance :

Comparison of Tiptronic S versus PDK SPORT PLUS (acceleration 0 - 124 mph)


2.13


All transmissions• Revised redline• More responsive throttle• PASM, PSM & PTM all shifted to SPORT Mode• Sport Exhaust (if fitted) automatically on• Visual enhancements (digital/analog stopwatch, etc.)• Performance display available in PCM 3.0

PDK transmissions• Sporty shift pattern in SPORT; race track shift pattern in SPORT PLUS

• Upshift later when accelerating• Downshift sooner when decelerating

• Enables Launch Control

Sport Chrono Package Plus Option


2.14


Deceleration downshift suppression, e.g. before cornering (FAST OFF)• On sudden release of accelerator pedal, active gear is retained.

Gear retention in cornering• Relevant gear is retained according to input from lateral acceleration sensors,

gear engaged and map.

Downshifting during the braking phase (FAST BACK)• On fast switch from accelerator to brake pedal, downshift is immediately initiated.

Downshift timing depends on the sportiness characteristic and selected mode.

Special Functions


2.15


Special Functions

“Temporary Manual Function” (while selector lever is in position “D”)•When in automatic mode, manual gear-selection can be initiated via the steering wheel and the selector lever. PDK automatically switches back to automatic mode after 8 seconds.

“One Touch Hold Function”•To engage lowest or highest possible gear, hold one-touch button on steering wheel or the selector lever in downshift (“--”) or upshift direction (“+”). PDK successively engages lowest/ highest gear possible based on engine speed – however, it will engage every gear in between


2.15


Stationary Decoupling•When vehicle is stationary - clutch opens as far as possible while brake pedal is depressed. Reduces fuel consumption and prevents vibrations from the drive train.

Creeping

• Creeping functionality of traditional automatic transmission is retained

Launch Control (Race Start)

•Press the brake with your left foot•Quickly and fully press down the accelerator (kickdown activated) and hold.

- Engine speed flattens out at around 6500 rpm. - “Launch Control Active“displayed on the on-board computer.

•Release brake within a few seconds

Special Functions


2.15


Special Functions

Hot Modes - Transmission “self-protects”:

“Transmission Temperature Too High” on instrument cluster

• “Warning Hesitations” can be felt when driving off and engine power may be restricted

• Reduce engine load and run engine in P or N until warning disappears

“Transmission Emergency Run” illuminated in White on instrument cluster

• Restricted gear shift comfort

• Failure of reverse gear

• Have fault repaired at authorized Porsche dealer

“Transmission Emergency Run” illuminated in Red on instrument cluster

• Fully open clutches (“no-go”) until system cools

• Have vehicle towed to authorized Porsche dealer


2.15


Porsche Doppelkupplung (PDK) (Optional ) $4080

Performance Enhancement Realized*

• Up to 60% reduction in gear change times• 15% increase in acceleration• 19% increase in acceleration w/Sports Chrono Plus • Reduces engine speed in 7th gear by approx. 30%• Weighs 22 lb less than Tiptronic S

Enhanced…

Fuel Efficiency, Comfort and Performance


*vs. predecessor Carrera S with Tiptronic S2.16


Thank You

Documents

Examine the Core – Performance - Coochascoochas.com/docs/997Mk2-PDK.pdf · 2010-01-27 · Examine the Core: Performance Explore the Core Module 2 Page 4 of 24 • high efficiency