MT Then and Now: Tesla Roadster, Model S, Model X Prototype
When Tesla Motors was founded in the early 2000s, many would never have guessed the company would last long enough to produce a car like the Model S. The first car to arrive was the Tesla Roadster, followed by the just-released Model S and, before long, the Model X. As we share the results of our exclusive range test of the Model S, WOT is taking a look back at the Tesla models we’ve driven and tested over the years.
Based on the Lotus Elise chassis, the Tesla Roadster replaced the Toyota-sourced four-cylinder gasoline engine with a 248-hp AC motor that generated 211 lb-ft of torque at 0 rpm. Juice supplied by a 6831-cell lithium-ion battery pack powered the electric motor that sent power to the rear wheels via a two-speed dual-clutch transmission. We were impressed during our First Drive of the Tesla Roadster in 2008.
“I’m almost grimacing as I release the brake and pound the accelerator to the floor. Whrrrrrrr…30 mph, 40 mph, 50…in the four seconds it’s taken to read this sentence, the Roadster has shrieked to 60 mph (Tesla’s claimed 3.9 seconds would seem entirely plausible in a controlled setting). There’s no wheelspin, axle tramp, shutter, jutter, smoke whiff, cowl shake, nothing. I’m being eerily teleported down the barrel of a rail gun, head pulled back by a hard, steady acceleration. Bizarre.”
During the following months, Tesla failed to deliver the first Roadsters on time and the car began to look like vaporware. After a long delay, deliveries began. The Roadster now used a one-speed transmission, which cured the ills that plagued the two-speed unit – that along with financial difficulties slowed development. Though horsepower remained the same, torque grew to 278 lb-ft of torque. The battery pack gave the Roadster a 227-mile range.
“Yeah, OK and driving it as intended, as a true sports car, ain’t great for range either. But boy does it lift the spirits. You know the drill: aluminum chassis, double wishbones, carbon fiber body, about 2750 pounds, excellent mass distribution and — oh joy! — unassisted rack and pinion steering. The Roadster delivers on the promises of its spec.”
In 2010, we finally tested a Tesla Roadster. Our tester came in Sport form, which bumped power to 288 hp and 295 lb-ft of torque. “…its acceleration is breathtaking. Make that breath-extracting. At the track, we confirmed the car’s 3.7-second scream to 60 mph — but, that’s just a number. Three-point-seven — what’s that mean? Felt, it’s such an unnatural thrust that it actually brings to mind that hokey Star Trek star-smear of warp-speed. The quick, linear accumulation of velocity makes you smile and hold on, shake your head, and eventually learn to carve unimaginable moves through traffic that’s populated by completely flat-footed internal-combustion cars.”
We compared that same Tesla Roadster against the 2011 Porsche Boxster S. In the end, we handed the win to the Boxster, but noted that “the Tesla is now a genuine car to reckon with on the world stage, despite its extraordinary price and limited range. Now if only it could better communicate its handling intentions.”
Unlike the Lotus-derived Roadster, the Model S four-door was fully developed by Tesla. The flat battery pack sits below the floor and the 306-hp electric motor powers the rear wheels. With no combustion engine or transmission to worry about, the design allows a small front trunk and a large rear hatch area. Optional rear-facing jump seats increase passenger seating to seven.
“The car’s acceleration — claimed to be 5.6 seconds to 60 mph — is a continuous press-the-seat-back surge that only a single-speed, big electric motor can provide. Interestingly, while the motor is quiet, its growly roar is a very different acoustic signature than the frenetic whine in the Roadster. Tesla claims that’s just how it sounds, and no acoustic modifications have been attempted. Bumps were nicely absorbed amid muted tire-impact noises, and the lateral grip seemed considerable for a car over 4000 pounds. That low battery location and compact powertrain are very helpful.”
Recently, we got another drive in the Model S. Horsepower has climbed since our first drive in the Model S, now at 362 hp and 325 lb-ft of torque while Performance versions make 416 hp and 443 lb-ft of torque. Depending on the size of the battery pack, the Model S’ driving range is said to be 160, 230, and 300 miles, the last of which was EPA-rated at 265 miles. “I’d advocate for a bit more rear seat space, comfort, and lateral support, and of course more range for less money would be nice,” Frank Markus concluded after his stint in the car. “But the dynamic performance, equipment level, and style nearly justify the price — even if you don’t care about the electric drivetrain. I don’t. And I want one.”
We traveled 233.7 miles during a recent trip in a Tesla Model S from Los Angeles to San Diego and back before stopping to recharge when the onboard range meter said we would be 1.7 miles short of reaching the office. Despite that, we were impressed by the energy cost to make the journey, “During our drive, we used 78.2 kW-hrs of electricity (93 percent of the battery’s rated capacity). What does that mean? It’s the energy equivalent of 2.32 gasoline gallons, or 100.7 mpg-e before charging losses. That BMW 528i following us consumed 7.9 gallons of gas for a rate of 30.1 mpg. The Tesla’s electrical energy cost for the trip was $10.17; the BMW’s drive cost $34.55. The 528i emitted 152 lbs of CO2; the Model S, 52 — from the state’s power plants.”
In our latest real-world range test of the Model S, we drove the electric car from the edge of Los Angeles to Las Vegas, then back to our El Segundo office. After these tests – which used Musk’s personal car, we developed some conclusions about the Model S.
“The take home message isn’t whether or not the Model S meets the EPA’s range rating of 265 miles. We’ve proven that it does and does not. The takeaway is that the Tesla Model S is not a real electric car, it’s a real car that just happens to be electric.”
Model X Prototype
If all goes well with the Model S, a production version of the Model X prototype — a three-row, seven-passenger SUV with gullwing style doors — is next from Tesla. Before volume delivery of that car begins in the 2014 calendar year, though, Tesla will depend on the sales of the Model S, a car that’s progressed quite a bit from the company’s beginnings with the Roadster.
By Jason Udy