Jaguar xjs

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articles: 1980 jaguar xj-s v12 – the cat roars – 226
september 17th, 2009 by nz classic car

this replica of tom walkinshaw’s famous twr jaguar xj-s will be one of the official cars on this year’s drive nz classic tour

when the xj-s was launched in september 1975, jaguar was on a hiding to nothing. for a start, the world was reeling from a major oil crisis; not the best time to introduce a new, gas-guzzling v12-powered car. secondly, at the start of the xj-s’ development cycle it looked very much like impending federal requirements would mean the end of the convertible car in the us — and the us market, ever since the days of the xk120, took a large slice of jaguar’s production pie. in short, the xj-s would be engineered as a fixed-head coupe.

thirdly, the xj-s was intended to replace the legendary e-type — and how could jaguar replace what was arguably the best-looking sports car ever built — by any manufacturer — with a tin-top coupe that featured a droopy rear-end and a spartan (by jaguar standards) cabin.

finally, of course, the xj-s entered production during the dark days when blmc was calling the shots.

with all the above in mind, it can be seen that the xj-s didn’t exactly debut on the crest of a wave.


however, when the first examples of the xj-s began to hit the road, opinions began to change. sure, most still criticised those controversial rear sail panels; the massive battering ram bumpers (another requirement foisted on car makers by us legislation); the weird instruments — which were set in a dull and rather plain metal dashboard — and, of course, the v12’s prodigious appetite for valuable middle eastern elixir.
xj-s history

based on a shortened jaguar xj saloon floor-pan, the xj-s is really a product of the late’ 60s, for it was at that time that jaguar began seriously working on an e-type replacement. from the start, the xj-s was developed as a coupe, and an open top version would not appear until 1985.

jaguar’s v12 was always part of the xj-s equation. this engine had been seen in prototype form in the infamous xj13 and subsequently saw service in the xj12 and the last of the e-types. for fitment to the xj-s, jaguar discarded carburettors and utilised fuel injection.

the xj-s was the last jaguar design to be influenced by sir william lyons and aerodynamicist malcolm sayer, who penned the car’s infamous flying buttresses. sayer died in 1970 well before the xj-s’ debut. to many, the xj-s represented the only serious styling errors made by lyons and sayer.

however, both men had the last laugh, as the xj-s would remain in production for 20 years and seven months, the final xjs (the hyphen between xj and s having been dropped in 1991) rolled of the line on april 4, 1996, making way for the new xk8.

during its long life-cycle the xj-s went through many variations — including a cabriolet and, a few years later, a full convertible. more traditional wood trim came in 1981. in the same year, now under the reviving influence of its new boss, john egan, jaguar also introduced the xj-s he, with the v12 engine taking advantage of michael may-developed fireball combustion chambers in its cylinder heads. this relatively low-cost conversion — it cost around £500,000 for jaguar to retool for the v12 he — allowed jaguar to fit a more relaxed, higher diff ratio to the car without sacrificing overall performance.

other big changes came when tom walkinshaw’s twr company joined forces with jaguar to form jaguarsport. under walkinshaw’s guidance the xj-s was developed into a well appointed and very quick gt, while the venerable 5.3-litre v12 was stretched out to 6.0 litres for the xkr-s — this larger capacity engine becoming a standard fitment in 1993. lister, famous for the lister-jaguar racers, went one further than the factory, enlarging the v12 to a mighty 7.0 litres.

and, of course, jaguar also produced a series of lighter, more nimble six-cylinder models, at first using its 3.6-litre six, followed by a 4.0-litre unit.

all these many changes transformed the xj-s. it may have started life as something of an anachronism, but it ended it days as a very desirable — and still largely underrated — grand touring car. indeed, while many admired its eventual replacement, the xk8, there were just as many who mourned the passing of the xj-s, which cut one of jaguar’s final, physical links with sir william lyons.
the dnz xj-s

purchased from a second-hand car dealer, the present owner of this car, roger phillips — the brains behind drive nz classic — doesn’t really know a huge amount about this car’s previous history other than the fact that it was originally imported into new zealand in 1988. the jaguar’s body received major attention some time in the late ‘90s in wellington and, at that time, the then owner spent considerable cash fettling the car’s v12 — and repainting it the same colour scheme as the twr jaguar xj-s raced at bathurst in 1985 by tom walkinshaw and win percy.

outwardly, this xj-s is virtually a carbon copy of walkinshaw’s james hardie 1000 pole-setting jaguar — the only real major difference being that this car is saddled with the standard three-speed gm400 turbo auto gearbox rather than the five-speed manual used by the twr cars.

as purchased, the xj-s was showing signs of wear and tear but, a significant advantage, the big, all-alloy v12 appeared to be in rude health — something that was very evident as the car came fitted with an open exhaust which exited under the driver’s side door. to say that the exhaust was loud would be an understatement; it was deafening!

this decibel meter-bashing exhaust was the first item to be replaced, with a rather more conventional rear-exiting exhaust being fitted — although it still delivers an appropriate roar when the loud pedal is mashed into the firewall.

in order to rein in the power of the v12, roger fitted new vented and cross-drilled front brake rotors with performance pads and, to enhance the jaguar’s handling, nolathane bushes were fitted to the front suspension and a new set of shock-absorbers was also prescribed. finally, a set of dunlop r tyres was wrapped around the jaguar’s massive alloy wheels.

moving inside the car, roger tossed out the old and tired upholstery, and the interior was treated to lashings of brand new grey leather.

for its role as part of the official drive nz classic vehicle fleet, the xj-s was also fitted with a roof-mounted light bar, strobe headlights and a siren.

a thorough going over revealed leaky differential and gearbox seals — since replaced — and, as you’d expect from a jaguar of this period, roger is still chasing down the odd electrical gremlin. during our road-test of the xj-s the driver’s window decided it’d had enough of winding up and down. this was later traced to a burned-out window lift motor; fairly typical stuff for a jaguar of this vintage.

by the time you read this article, roger will have given the xj-s a bloody good shake-down at the season-opening icebreaker race meeting at pukekohe. a series of hot racing laps should reveal any other problems, with plenty of time for rectification before the running of drive nz classic.
on the road

this is not the first xj-s i’ve driven, having sampled several variations — most notably a cabriolet, a thumpingly quick jaguarsport xjr-s, and an even quicker lister-modified car. so, stepping into this xj-s was a little like getting reacquainted with an old friend.

despite this car’s new leather upholstery, early xj-s such as this have a rather plain interior. minor instruments — water, oil, fuel and volts — are a series of aircraft-style revolving barrels. they don’t look very nice but, when everything is operating at normal temperatures (and the fuel tank is half-full), the needles on the dials form a single straight line, so everything can be checked with one glance. the remainder of the instruments are highlighted with a cheap, silver-painted border, giving the xj-s interior a severe look.

ahead, the jaguar’s bonnet stretches out to the horizon and is made to look impossibly long due to low seating position, and a front ’screen that appears to be more of a viewing slit than a windscreen.

however, once you crank the mighty v12 into life, mere aesthetics disappear out through the rear tailpipes.

many years ago i was lucky enough to drive an early, four-speed manual xj-s, and the muscles in my left leg still twinge at the memory of that car’s stiff clutch, not to mention its notchy, old-fashioned cog ’box — probably why jaguar dropped the manual gearbox option on the xj-s in 1978.

the gm 400 turbo isn’t a bad transmission but, in comparison to more modern units, it feels clunky and old fashioned. as well, due to its torque convertor idiosyncrasies, it isn’t that easy to exploit the power of the jaguar’s big v12. however, there is little doubt that there is sufficient performance on offer and, once over 4000rpm, the engine delivers a lovely growl as it hurls the car over the blacktop with an effortless surge of power and torque.

the big cat’s handling and road-holding is still rather good considering its age, and tends towards mild understeer. under harder cornering the xj-s switches to easily controllable oversteer and, although it’s not hard to provoke a slide by punching the gas, the jaguar can get a little messy at the limit as the rear end lurches around a tad. anyway, on-the-limit driving isn’t really encouraged by the car’s overly light, power-assisted steering — it carries more weight than a contemporary xj6 or xj12, but it’s still too light for my taste.

as well, the huge dunlop rs fitted to roger’s xj-s take a long time to warm up during normal road driving. before they hit their best operating temperatures they tend to follow even the tiniest road irregularity and, more unnervingly, squirm under braking. indeed, it was only towards the end of our brief road-test that the dunlops began to heat up — at which stage they started to indicate their massive grip potential.

all in all, an exciting drive and, as long as you’re prepared to hold the gears manually, a seriously quick car. roger has considered dropping a five-speed ’box into this car — such an addition would turn it into a real flyer.

if you get a chance to catch up with any of the speed events that make up the drive nz classic tour, watch out for this big, snarling cat.



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