Power-train and Chassis

The XK 2010MY introduces 2 new engines, the AJ-V8 Gen IIIS 5.0litre V8 and AJ-V8 Gen
IIIR 5.0litre V8 Supercharged. New to Jaguar, the XK is the lead programme for these
engines.  The new engines offer significantly increased performance with no detrimental
impact on emissions, economy, driveability or refinement.
Both engines are new, with only 2 components carried over from the previous generation
of V8 engine

• AJ-V8 Gen IIIS, 5.0litre Naturally Aspirated
• 5,000cc, 385PS EEC, 385hp SAE +29.2% vs 09MY
• 515 Nm of torque EEC (376lb/ft SAE) +25% vs 09MY
• 0-60mph 5.2secs (0-100kph 5.5secs)  +11.9% (+11.3%) vs 09MY
• Top speed limited to 155mph (250kph)
• Fuel economy – 25.2mpg (11.2 l/100km), US 24.6mpg
• CO2   264g/km  +1.9% vs 09MY
• AJ-V8 Gen IIIR, 5.0litre Supercharged
• 5000cc, 510PS EEC, 510hp SAE  +22.6% vs 09MY
• 625 Nm of torque EEC (461lb/ft SAE)  +12% vs 09MY
• 0-60 mph 4.6secs (0-100kph 4.8secs)  +6.1% (+7.7%) vs 09MY
• Top speed limited to 155mph (250kph)
• Fuel economy – 23.0mpg (12.3 l/100km), US 23.2mpg
• CO2   292g/km  +0.7% vs 09MY  

XK vs competition           
                                                                                

Fig 4.1b XKR vs competition

Technical Feature

Key features of the AJ-V8 are;

• SGDI : Spray Guided Direct Injection – enables the air to fuel ratio mix to be
  optimised, providing improvements to both performance and economy
• DIVCT : Dual Independent Variable Cam Timing – improves fuel economy
  and emissions by optimising residual exhaust gases. This is an industry first.
• CPS : Cam Profile Switching – power and torque optimisation. 2 stage valve
  lift enables cam periods to be optimised for volumetric efficiency giving up
  to 10% improvements in mid range torque – XK Naturally Aspirated
• VIM : Variable Intake Manifold – 2 stage intake manifold offers power and
  torque optimisation through the engine speed range – 1st stage enhances
  low down torque, whilst the 2nd stage enhances high end power –
  XK Naturally Aspirated
• Sixth generation Easton supercharger on the XKR offers an improvement
  to front entry air intake and rotor geometry benefitting NVH and efficiency
• Split cooling – fuel economy is improved through detailed optimisation of
  cooling system which reduces oil and coolant warm-up times 

Other new features supporting the new AJ-V8 installation are;

• Auto transmission upgrade to ZF 6HP28, including 350Nm torque converter
• The all new 6HP28 electronically controlled, six speed transmission
• represents the latest in automatic transmission technology and
  incorporates new features to enhance the transmission functionality
• The hydraulic and electronic control elements of the transmission
  are now incorporated in a single unit located inside the transmission
  and is known as "Mechatronic"
• A fully adaptive shift system gives the smoothest gear shifts and
  optimum performance all the time. This system provides continuous
  adaptation of shift changes to suit the driving style of the driver, which
  can vary from sporting to economical.
• Adaptive Dynamics replaces CATS suspension.
• Conventional passive damper tuning must choose a suitable
  compromise between ride (soft damping) and handling (firm damping)
• Adaptive Dynamics continuously varies the damping to suit the driving
  conditions, therefore breaking the compromise

 Primary Function

• Body control – calculates road induced body motions 100 times a
  second and sets each damper to the appropriate level to maintain
  a flat and level body – benefit is improved body control without loss
  of ride.
• Roll rate control – predicts vehicle roll rate due to driver steering
  inputs 100 times a second and increases damping to reduce roll
  rate – benefit is improved handling and driver confidence
• Pitch rate control – predicts vehicle pitch rate due to driver throttle
  and braking inputs  100 times a second and increases damping
  to reduce pitch rate – benefits improved handling and driver confidence

Additional Function

• Bump rebound control – monitors the wheel position 500 times a
  second and increases the damping rate as the damper approaches
  it's travel – benefit is improved ride
• Wheel hop control - monitors the wheel position 500 times a second
  and detects when the wheel is at it's natural frequency and increases
  the damping - benefit is improved ride

• Jaguar Drive Control has overriding control of the engine throttle map,
  gearshift severity, Adaptive Dynamics, DSC, Active Differential Control
  and modifies exhaust character. 
•  Dynamic mode
• Adaptive Dynamics increases the body control for a more
  connected ride - benefits sporty dynamics
• More aggressive accelerator pedal map and gearbox shift
  maps for a more involved drive.
• Modified DSC parameters revert to Trac mode
• Winter mode
• Damped accelerator pedal map for more progressive and
  controlled performance to maximise composure.
• Bespoke gearbox calibration for early upshifts and later
  downshifts to increase driver confidence on low friction
  surfaces.
• Modified DSC parameters set for Winter mode (not accessible
  via DSC button). Tuned to be safe yet inspire confidence in
  slippery / adverse road conditions. It includes an all new Hill
  recognition feature which increases the traction performance
  in a wintry environment.
• Active Differential Control is a new technically controlled differential for XKR
  only
• ADC offers superior asphalt and loose surface traction, resulting in
  better vehicle performance (eg. accelerating hard out of a T-junction
  or encountering a patchy road surface)
• As it is fully automated it can vary its locking torque dependent on the
  prevailing surface conditions, thus potentially improving stability when
  required – removes the disadvantages of limited slip differential.
• It is integrated to work in harmony with other systems such as traction
  control and ABS, further improving overall vehicle performance
• An all new differential is fitted for XK Naturally Aspirated models
• Dynamic Stability Control is tuned to offer 3 modes – Normal, Trac and DSC
  off – for all models
• Normal – for everyday scenarios. Activated automatically on vehicle
  start up
• Trac – optimised for making swift progress. Allows for greater driver
  involvement
• DSC Off – the system can be switched off with a 10 second press of
  the DSC button.

• All  XK models gain upgraded brakes to accompany the increased performance
  and power of the AJ-V8 engines
• Naturally Aspirated models are now fitted with the brakes from the
  existing XKR to manage the additional power of the 5.0 AJ-V8
• The new XKR gains the all new R Performance brakes which have
  380mm front brake discs with a new aluminium calliper, which significantly
  increases the stopping power.
• A revised bespoke exhaust system is fitted to all models with active exhaust valve
  technology featured on the XKR, offering a duality of character – quiet cruiser or
  sports performer. 
• The air intake system and inlet manifold are optimised on all XK models to enhance
  the induction noise and add character to the engine sound quality. The further
  incorporation of semi active mufflers and acoustic tailpipes (XKR only) brings
  out the distinctive sound of the AJ-V8 engine.
• All new rear sub-frame to accommodate the latest four point mounted differentials
  for all XK models allows for improvements in refinement.

Service Interval Strategy
Co-incident with the introduction of these new powertrains, the routine service intervals will
be increased from 10,000miles /One Year to 15,000 miles/One Year
The enablers for these increases are;

• An oil level sensor and warning in message centre
• A brake pad wear indicator in message centre

The benefit of these improvements is lower cost of ownership as a result of the reduction
in the number of services required in a 60k mile/3 Year period from six to four.

Performance & Economy versus Key Competition