I took this off Wikipedia, I know its not the definitive source, but what is the difference in engines. Where does the XKR-S get its extra power? It also shows there was 410 hp in the XKR-S but has speed limiter of 174?
Jim

4.2 litre V8 Petrol Supercharged (AJ34S) 2006–2008 4,196*cc (256*cu*in) V8 supercharged (86.0*mm (3.39*in)x90.3*mm (3.56*in) 426*PS (313*kW; 420*hp)@6250, 560*N·m (413*lb·ft) @ 3,500 4.9 Coupé, 5.0 Convertible 250*km/h (155*mph) (limited)

4.2 litre V8 Petrol Supercharged (XKR-S) 2008 4,196*cc (256*cu*in) V8 supercharged (86.0*mm (3.39*in)x90.3*mm (3.56*in) 420*PS (310*kW; 410*hp), 560*N·m (413*lb·ft) 5.2 280*km/h (174*mph) (limited)

 

This explains its just adjustments to the engine and design but less hp.


The XKR-S is a limited version of the base Jaguar XK that also happens to be the fastest XK in production to date. This was achieved by recalibrating the engine management, with improved aerodynamics, and modified suspension. The top speed has been limited electronically to 174 mph (280 km/h). The XKR-S stands out from the production XKs by its unique badge on the rear, slight bodywork and reduced ride height.

COMPARE WITH:
SEE ALSO: OTHER ENGINES · PHOTO GALLERY
JAGUAR XKR-S 4.2 V8 6AT (415 HP) Specs
JAGUAR XKR-S 4.2 V8 6AT (415 HP) (2008 - 2010) DIMENSIONS, GROUND CLEARANCE, FUEL, ACCELERATION



GENERAL
CYLINDERSV8 DISPLACEMENT4196 cm3POWER305 KW @ 6250 RPM
415 HP @ 6250 RPM
409 BHP @ 6250 RPMTORQUE413 lb-ft @ 4000 RPM
560 Nm @ 4000 RPMFUEL SYSTEMMultipoint Injection FUELPetrol CO2 EMISSIONS294 g/km
PERFORMANCE
TOP SPEED174 mph OR 280 km/hACCELERATION 0-62 MPH (0-100 KPH)5.2 s

 

I am looking at this because there is so much talk about pulley modifications and ECU tuning. What did Jaguar do for the XKR-S.

This suggests much more HP in the XKR-S.

Jaguar XKR-S 2008
Jaguar XKR-S 2008





The real car...



The Jaguar XK (project code X150) is the second generation of the Jaguar XK grand tourer from Jaguar Cars. The vehicle was unveiled in 2005 at the Frankfurt Motor Show with the first generation's 4.2 V8 engine. The XK convertible was unveiled in 2006 North American International Auto Show in Detroit. A facelifted XK was launched in 2009 with a new 5.0 L V8 engine.

The XKR-S includes a supercharged AJ-V8 Gen III R direct-injection engine rated 550 PS (405 kW; 542 hp) @ 6,000 to 6,500 rpm and 625 N·m (461 lbf·ft) @ 2,500 to 5,500 rpm, raised top speed of 300 km/h (186 mph), active sports exhaust, bespoke suspension changes front and rear, 16-way adjustable memory sports seats with carbon-fibre effect leather, reprogrammed Adaptive Dynamics, 20-inch Vulcan wheels and Pirelli P-Zero tyres, standard Jaguar High Performance Braking System.
Source: Wikipedia

Car specifications

Fuel
Petrol
Drive
RWD
Engine size
4.2 Litre V8
Output
542 BHP
Top Speed
186 MPH
0 to 100 km/h (0 to 62 mph)
5.2s
Price

 

I am certain that the XKR-S has the 5.0L engine.

Here is what is found in a review from Car & Driver:

The GT’s supercharged 5.0-liter V-8 is rated at 550 horsepower at 6500 rpm, and it produces 502 lb-ft of torque from 2500 rpm—identical levels of output as the mill found in the standard XKR-S. Jaguar promises a 0-to-60 sprint in 3.9 seconds, a conservative claim that we believe can easily be beaten. Top speed, somewhat curiously for a track special, is governed at 186 mph. But at that velocity, the XKR-S GT generates 320 pounds of downforce, and it probably wouldn't go much beyond this marker anyway.

Here's the link:

2014 Jaguar XKR-S GT Photos and Info – News – Car and Driver

I am sure any owner of a XKR-S will chime in on this thread.

 

Everything I found said the 08 XKR-S was a 4.2 with only 200 units sold and I believe only in Europe.
Jim

 

Jim:

I didn't even realize that Jaguar produced a XKR-S in 2008, but you are correct with the above data.

Here's what I found to back up your data supplied:

Jaguar XKR-S Coupé

I was under the impression that the XKR-S was a new model in 2012-2013-2014. Certainly these models have the new design.

Shows what I know.......

 

Rich,
The article shows they took a lot from the XKR-S to make the Portfolio, Alkon brakes, vented hubs and 20 inch wheels.
Jim

 

Yes, the first XKR-S was made in 2008. It was the precursor to the XKR-75 and the XKR Dynamic Pack. It was Euro only and is described:


The new XKR-S coupe is the fastest production XK to date, providing the Jaguar enthusiast with an even more driver-focused high speed performance experience

Limited to 200 cars – available only in Europe, in both right-hand and left-hand drive

The XKR-S is capable of 0-60mph (0-100kph) in 4.9 (5.2) seconds and has a maximum speed, electronically limited, of 174mph (280kph) – making it the fastest Jaguar since the XJ220 supercar

Revised suspension with bespoke springs, dampers, anti-roll bar and recalibrated Computer Active Technology Suspension (CATS) further improve the XKR's outstanding ride and handling balance

Exterior styling features revised front air-splitter and side sill-extensions, revised rear spoiler and rear bumper with unique diffuser panel and unique 20" lightweight Vortex alloy wheels

Ultimate Black metallic paint colour with contrasting finish to the grille, sills, side power vents and rear diffuser

Alcon R Performance braking system with red monobloc six-piston callipers and 400mm brake discs at the front, 350mm at the rear

Six-speed automatic transmission with Jaguar Sequential ShiftTM for ultra-quick manual gear shifts in milliseconds, using steering-wheel-mounted paddles

Active Exhaust System ensures refinement at cruising speed but purposeful V8 roar under hard acceleration

The easiest way to spot one is by the Vortex wheels with the red Alcon brakes:

 

Yes, the 2008 R-S was an out-of-hours & weekends project created by the same dynamics team (Mike Cross, Dave Pook and Matt O'Hara) that worked on the original 4.2 XKR. They wanted to see what the car would be like with a more performance-focussed handling setup. Management liked what they saw, and decided to release it as a limited edition. The same process lead to the XKR 75 and eventually the 5.0 R-S.