Tesla's new entry-level 70D doesn't exactly give off an "base model" feel.

Tesla may have pushed back the planned introduction of its second model-line, but it has also been rapidly expanding the number of variants of its big Model S. Only a few months after adding its first all-wheel-drive version, as well as the fastest Model S yet, the Silicon Valley start-up is adding a new base model to the Model S mix.

To be more precise, it is dropping the old base version in favor of a faster, longer-range spin-off, the Tesla Model S 70D. At $76,200 before the applicable federal tax credit, and making a healthy 514 horsepower, this is not exactly what you’d consider your typical base vehicle.

You’d certainly be hard-pressed to tell while taking the 70D out for a drive, as we did this week shortly after Tesla announced the changes to its line-up.

The new variant replaces the old 60D which was about $5,000 lower in base price. At first glance, you’d have a hard time telling the two apart – or differentiating the 70D from any other Model S, for that matter.

The primary differences, beyond badging, are found under the hood, so to speak. What you get, first of all, is a larger, 70 kilowatt-hour battery good for an estimated range of 240 miles per charge. That’s better than the old 60d at 208 miles, and not all that much behind the top-line Model S, and more than double what just about every other battery-electric vehicle on the road now can deliver.

For many potential buyers, the 70d should provide more than enough travel to obviate “range anxiety.” It’s about as much as most drivers would likely track in a week. Notably, the 70D comes with the unlimited use of Tesla’s fast-expanding Supercharger network, a $2,000 option on the old 60D. There are currently more than 250 of those super-fast chargers in place around the U.S. and Canada, and lots more are coming.

The heart of the drivetrain is a pair of electric motors, one for each axle, and each producing a peak of 257 hp. In reality, you’re never going to see all of those 514 ponies. For a variety of reasons, Tesla has used software to limit output to a peak 329-hp.

Then again, when it comes to battery-cars, horsepower isn’t the primary number to worry about; it’s torque. Electric motors make 100% of their wheel-spinning torque the moment they’re turned on, which is why a beefy enough electric drivetrain can press you firmly into your seat when you slam the throttle.

Unfortunately, Tesla has not yet released torque numbers for the Model S 70D, but even a short drive will suggest that the number is measured in gobs. Heading out on a winding course that combined wide boulevards, Interstates and local roads, we needed only a matter of minutes to recognize that the new sedan is quick. Very, very quick. Passing maneuvers were lightning fast, as was our merge onto I-75. We had to back off the throttle barely halfway down the entrance ramp and were still pushing well into extra-legal numbers.

Officially, Tesla lists a 0 to 60 launch of 5.2 seconds. While we didn’t have enough time to run our stopwatch we’re inclined to believe that number errs on the conservative side.

The Model S 70D proved nimble and adept at weaving through traffic with a firm yet comfortable ride, its suspension intuitive enough to know when to hunker down for more aggressive maneuvers.

That “D,” incidentally, is the tip-off that this is one of Tesla’s new all-wheel-drive models

If there was any surprise with the sedan it was the noise level. No, it wasn’t loud. It was easy to hold a normal conversation, but it was slightly louder than some other EVs we have driven. Cutting the decibels is a major challenge for plug-based automakers who have to deal with the so-called stumps-in-the-swamp syndrome. All those belts and pulleys, the little motors and even the crackle of tire rubber no longer are masked by the sound of a roaring internal combustion engine.

As for the sound of the drivetrain itself, the Tesla Model S, in all its forms, produces a confident whine as you accelerate, not unlike the sound of the battery race cars in the new Formula E series. To classic muscle car fans it may be more like a scratching phonograph needle. To techies – who may never have heard a phono – it’s music to the ears.

(Tesla introduces entry-level Model S. For more about the 70D, Click Here.)

The 70d’s interior is basically the same as the top-line P85D, complete with the massive touchscreen display that serves all manner of functionality, from operating the climate control system to locating nearby chargers.

Tesla recently upgraded software – remotely and automatically, one might note – among other things providing the ability to predict when you’ll need to recharge and helping you find a charger along the way. It’s not only one of the most functional infotainment systems we have seen, but also the fastest. We wish our laptop computer was as quick.

(Click Here for details about Tesla’s new quarterly delivery record.)

The digital technology includes adaptive cruise control and a collision warning system. It also has the capability of being upgraded – again, automatically – once Tesla launches its semi-autonomous Autopilot technology in the next year.

Is it worth the money? Factor in the $7,500 tax credit and a few options and you’re coming in around $70,000. It’s steep but not out of line with similar luxury vehicles offering the same level of performance. Meanwhile, Tesla will quickly remind you of the money you’re saving on fuel.

(To see more about the revival of the Fisker Karma, Click Here.)

No, it’s not going to take the California carmaker into the mainstream, but the addition of the Model S 70d is likely to expand the appeal of this battery sedan, Tesla already reporting record sales in the latest quarter. It’s a fun car to drive – one that will shock anyone who thinks of battery cars as slow and stodgy. It’s also lavishly equipped. And it suggests that Tesla is becoming a serious challenger to traditional luxury brands.

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