MotorTrend takes the new 2014 BMW i8 and compares it against “the reigning green-car champ” high-performance, fully electric Tesla Model S P85+.
The top-of-the-line P85 comes with with 416 hp, 443 lb-ft of torque at 0 rpm, some handling tweaks, a jumbo 85 kilowatt-hour battery pack rated at 265 miles of range per charge, and a starting price $95,740.
*Editor's Note: This post appears on BMWBLOG. Check it out here.
BMW i8 uses a plug-in hybrid system consisting of a turbocharged three-cylinder BMW TwinPower Turbo petrol engine and BMW eDrive technology in the form of an electric drive system. The 1.5-liter combustion engine develops 170 kW/231 hp and drives the rear wheels of the BMW i8, while the 96 kW/131 hp electric drive sends its power to the front wheels and allows an all-electric range of up to 35 kilometers (22 miles) and a top speed of 120 km/h (75 mph).
Let’s find out which one is a better car:
We’ll grant you that comparing an upright 5-7-seater with a low-slung 2+2 is unconventional, but then so are the cars. And with as-tested prices that fall within 10 percent of each other, these green-tech marvels are aimed at customers with similar demographic and psychographic profiles. Mind you, the base prices are further separated — $94,570 for the Tesla, $136,650 for the i8. But by the time a Motor Trend-grade car enthusiast runs through the Tesla options list speccing must-haves such as the $8750 performance-tuned air suspension, the $4500 21-inch gray performance-plus wheels shod in Michelin Pilot Sport PS2 tires, $2500 worth of performance seats, and a few more sybaritic options, the price can escalate quickly, as ours did, to $126,520. The i8 comes pretty fully loaded with only three option packages — Giga World ($2000 — our test sample), Terra World ($3000), and Pure Impulse World ($10,800). Each package upgrades the width of the staggered-fitment 20-inch wheels and ups the interior opulence.
It’s hard to believe that a low-slung, 3378-pound carbon-fiber car with a turbo engine, all-wheel drive, and two electric motors lugging just 9.3 pounds per total system horsepower plus six gears’ worth of torque multiplication couldn’t just run away and hide from a big, upright, 4633-pound (11.1 pounds per horse), rear-drive electric hatchback with a one-speed transmission — but in fact it can’t.
The Tesla’s peak torque at 0 rpm makes for a great hole-shot, and it travels just 20 inches farther than the i8 to reach 30 mph. It actually reaches 60 mph 8 inches ahead of the i8, though 0.1 second slower than the i8′s 3.8-second time. By the quarter mile, the Tesla is running out of leverage from the one-speed, so its trap speed trails the i8′s, but the time is still close: 12.5 seconds at 108.4 mph compared with the i8′s 12.4 at 112.1. In the grip department, the Tesla continues to amaze, managing to halt from a 60-mph clip 1 foot shorter than the BMW (102 feet versus 103).
Bend them into a turn, however, and the lighter (more evenly weight-balanced) i8 takes the lead, generating 0.94 g of lateral grip to the Tesla’s 0.91. That cornering advantage allowed the BMW to carry a bit more speed through the ends of our figure-eight course, while the AWD helped it claw its way out more quickly, carrying a 4-5 mph advantage on the Model S at corner exits. This added up to a scant 0.2-second advantage (24.6 to 24.8) with a tie in overall average lat/long g at 0.80. Again, unimaginably close performance for such disparate vehicle types. Let’s give the advantage to BMW, by the slimmest of margins.
Model S Wins
You're definitely going to enjoy reading the full comparison...