Jaguar XJC V12 Dyno Power Tested

Classic Coupe Gets Major Boost

My Jaguar XJC V12 visits the dyno & the result is more power & it sounds even better!

Since 2021, Harry Metcalfe has documented the revival of his Jaguar XJC V12. Recently, the vehicle got a fresh fuel-injection setup along with an ECU. Of course, he’s now curious to learn what power the elegant coupe is producing, thus necessitating a dyno run. This will conclude its restoration and bring it back to life.

The XJC, which stands for ‘coupe’ in its title, is derived from the second generation of the Jaguar XJ sedan. Combustion is sourced from a big 5.3-liter V12 that is mated to a manual transmission.

Upon inspection of the V12 Jaguar unmolested, the hood reveals a disheveled sight. An abundance of hoses and tubing detract from perceiving the muscular powerplant. To effectuate a beautiful aesthetic, the restoration includes tidying up these various pipework-creating an orderly, more appealing picture.

Initially, the 5.3-liter V12 engine made 285 hp and 294 lb-ft of torque, as indicated in a booklet that Metcalfe exhibits in his video. As a result of the renovated fuel system, it is now executing 350 hp and 374 lb-ft. This symbolizes an increase of 23% more power and 28% greater torque.

Whilst travelling, the automobile has a dual character. As it cruises, the engine is hushed, yet above 4,500 rpm, it breaks into a hearty shriek. With the manual gearbox, Metcalfe can swiftly access the incredible soundscape of the car when shifting down a few gears.

The concluding portion of the video merely displays Metcalfe zooming and relishing his reanimated XJC. It appears to be an exhilarating affair.

The Jaguar XJC is an uncommon automobile as a result of its brief manufacturing sprint from 1975 to 1977. Either a 4.2L inline-six or a 5.3L V12 provides the power, as featured in Metcalfe’s version. What makes the coupe unique, when seen from the side, is the lack of a B-pillar that creates a wide passenger area. About 10,000 were produced in total with only around 1,800 housing the V12 engine, according to Metcalfe in one of his earlier reports.

Sources: Harry’s Garage via YouTube, Harry’s Garage via YouTube