Alpina D3 S Touring

There’s life in the turbodiesel estate yet, and this reworking of BMW’S M340d is the pick of the bunch

THERE WAS A TIME WHEN A COMPACT estate car with a sizeable diesel engine was the dream ticket for those who wanted a respectable level of performance to go with their frugality requirements. And if that diesel-sipping engine happened to have six cylinders, or more, better still.

This inevitably meant that the German manufacturers did what they do best and entered into an arms race to see who could produce the most ludicrous diesel engine for a production car (step forward Volkswagen, with its 5-litre V10). But it was BMW’S straight-sixes that managed to get the balance of efficiency and performance just so, making the models they were fitted to feel less like load-lugging torque monsters and more like peppy and responsive performance cars. Pair one of those engines with an estate body and for some the combination was unbeatable.

That appeal continues today, with Alpina selling a third more D3 S Tourings than it does saloons. And despite sales of diesel cars in general dropping more sharply than an oilburning engine’s power curve, the firm is hoping that the popularity of its take on the diesel 3-series will continue with the arrival of this new, G21-based version, which starts life as an M340d xdrive, making this the first mild-hybrid Alpina.

Unlike the brilliant petrol-powered B3 (see evo 281), which benefits from a fully fledged S58 M engine, the D3 S retains the 340d’s 3-litre twin-turbo diesel unit, albeit with a new map for the ECU to lift power and torque to 350bhp and 538lb ft respectively (up 15bhp and 22lb ft). Alpina also upgrades the cooling system with two new radiators and an uprated intercooler and optimises the shift pattern and speeds of the ZF eight-speed auto.

There’s no disguising the shove the straightsix delivers. With the mild-hybrid system masking the traditional slow responses of a diesel engine waiting for its turbos to spool up, the instantaneous pick-up makes even the regular M340d feel light on its toes. The Alpina is even quicker off the line, more responsive through the mid-range and has a wider top end, too, adding the sucker punch that’s missing in the M340d.

But – here it comes – just as the standard car’s advantage over its petrol equivalent has all but been erased with the latest generations of petrol engines being so parsimonious, so too the D3 S operates in the B3’s M-powered shadow. And while it’s key to acknowledge that the petrol Alpina costs considerably more, if you were to drive the pair back-to-back you’d be hard pressed not to conclude that the petrol-engined model is worth every penny of its £12,000 premium.

Not that buying a D3 S is a poor decision, and if you have shortlisted an M340d (£52,060) or Audi S4 Avant (£50,810), you should at least consider

the Alpina (£55,950), if not ignore the others altogether, because while its powertrain isn’t as special as its M-engined brother’s, it still benefits from Alpina’s other upgrades. The driveshafts are uprated and there’s Alpina’s own torque split for the xdrive four-wheel-drive system; there are also new spring and damper rates, an upgraded brake system, recalibrated steering and revised software for the rear limited-slip differential.

The standard wheels are 19-inch items in the classic Alpina style, but 20s, as fitted to our test car, are also available for an additional £2080. They look a little overkill in terms of size and result in a ride that’s a little noisier at low speeds, but when you widen the throttle opening it settles, with more focus and a firmer grip on the body than you’d find with the M340d. The D3 has more directness to its steering, too, and more precision during the initial turn-in phase, and as you’d expect from a German manufacturer (Alpina is able to stamp, albeit rather crudely, its own chassis number on the front suspension turret) it only becomes more confidence inspiring as the speeds climb higher.

The D3 S is also a more fluid car when you begin to push and lean on its chassis, the torque split more rear biased more of the time than in the BMW, resulting in a more hookedup and engaging car to drive. As you start to peel away the layers of electronic intervention the D3 S begins to feel more organic, as per the B3, with Alpina’s more detailed dynamic set-up able to extract more, leaving you feeling more in control. Stepping over the limit allows the diff to demonstrate that a well-sorted, (predominantly) rear-drive BMW is still an engaging and fulfilling car to drive. Although it does leave you frustrated as you contemplate how much better it could be if it didn’t weigh the wrong side of 1900kg – 1935kg to be precise,

Above: twin-turbocharged 3-litre diesel straight-six gains 15bhp and 22lb ft over BMW’S M340d. Above left: Alpina-specific metallic green paint is a £1740 option

which is 70kg more than the B3 Touring and totally unacceptable and unnecessary.

Nevertheless, as fast diesel estates go, the D3 S gets our vote over an S4 or an M340d, but there would always be that nagging doubt that we should have worked harder to be able to afford the B3.

Engine In-line 6-cyl, 2993cc, twin-turbo diesel Power 350bhp @ 4000-4200rpm Torque 538lb ft @ 17502750rpm Weight 1935kg (184bhp/ton) 0-62mph 4.8sec Top speed 167mph Basic price £55.950

+ The best fast diesel you can buy; sweet chassis balance - Heavy fuel, heavy car; the B3 evo rating ★★★★ ☆