Tuner drops diesel into BMW Z4 for 63 mpg sports car

Illustration for article titled Tuner drops diesel into BMW Z4 for 63 mpg sports car

Conundrum alert gearheads! Does your lust for diesel outweigh your desire for speed? Is a sexy BMW drop-top more or less sexy when you drop in a more powerful motor for a top-o-the-line diesel fourbanger? Would you rock AC Shnitzer's 99d concept car?

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Let's start with the facts: a brand new BMW Z4 went under the knife to have the stock six-cylinder powerplant replaced with the diesel four-cylinder from the BMW 320d. And because it's AC Schnitzer they bumped power to 190 hp and 310 lb-ft of torque. This is good for a 0-to-62 mph time of 6.9 seconds. Not great, but not awful.

Illustration for article titled Tuner drops diesel into BMW Z4 for 63 mpg sports car

If they snagged the twin-turbo 335 horsepower six-cylinder from the sDrive35is we'd consider this sacrilege, but in Europe they also offer the wimpier 201-hp six-cylinder version. If this was the swap they made they're a little lower on horsepower, but they've boosted torque by 130 lb-ft without sacrificing much in the way of acceleration.

And what of emissions? If the point is to be green, dropping emissions from 109 g of CO2 to 99 g isn't anything to sneeze diesel particulates at (99 g is roughly the equivalent of 63 mpg US). As an enthusiast there's something sexy about being able to out-mileage a Prius in something this attractive (paint aside).

Illustration for article titled Tuner drops diesel into BMW Z4 for 63 mpg sports car

Unfortunately, the conversion was a one-off vehicle and AC claims the cost of building one of your own is something like $210,000. At that price it's probably better for you wallet and the environment to buy a tuned AC Schnitzer Z4 and to sometimes take the bus.

DISCUSSION

hammerheadfistpunch
HammerheadFistpunch

please explain the conversion from grams of CO2 to mpg... I are intrigued by this interesting math.