Tesla slams IIHS after 'Acceptable' Model S test, older NHTSA ratings cited in response

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The influential Insurance Institute for Highway Safety has released a new round of crash-safety test results, and one of the cars tested was the Tesla Model S electric luxury hatchback sedan.

In its accompanying release and video, the IIHS suggested that Tesla's claim the Model S is the "safest car in history" might no longer be accurate.

Quickly, the Silicon Valley carmaker fired back, releasing a statement that suggests the IIHS and its test results are less important for judging a car's safety than those from the federal government.

DON'T MISS: BMW i3, Tesla Model S electric cars miss top IIHS safety ratings (Feb 2017)

That might be news to both car buyers and the entire rest of the auto industry, all of whom take the IIHS tests very seriously.

The most recent IIHS tests were performed on six large sedans, three of which qualified for the IIHS's highest award of Top Safety Pick+, a highly desirable and much-researched designation.

Those cars were the latest versions of the Lincoln Continental, the Mercedes-Benz E-Class, and the Toyota Avalon.

The 2017 Tesla Model S earned only an

The 2017 Tesla Model S earned only an

The Tesla Model S, along with the Chevrolet Impala and the Ford Taurus, did not receive the designation because they earned only an "Acceptable" rating, rather than the top score of "Good," on the IIHS small-overlap frontal-crash test.

That's not surprising: that tough new test was added only in 2012. By that time, the designs for all three sedans had been finalized.

While a few makers' cars, notably those from Volvo, tend to do well in any new tests, most makers "design to the tests" to a greater or lesser degree—meaning those older cars' structures weren't designed to pass a test the makers didn't know about.

READ THIS: Tesla Model S Gets Five Stars For Crash Safety From NHTSA (Aug 2013)

The IIHS spent considerable time in its release discussing the results it achieved for Tesla's highest-production vehicle.

It noted that the Model S was initially rated Acceptable when first tested for small overlap, a new test it had added to show how a vehicle behaves if only the driver's front corner hits another vehicle, a pole, or a tree.

The problem in that first test had been excess forward movement of the crash-test dummy's torso, which let the dummy's head hit the steering wheel even though it was cushioned by an airbag in between.

In Tesla Model S electric cars built after January 2017, the company had changed the seat belt in an attempt to reduce such forward movement—but when the institute tested an updated Model S, the problem recurred. Hence, the rating wasn't changed.

NHTSA Tesla Model S crash test (Image: crashnet1 Youtube screen grab)

NHTSA Tesla Model S crash test (Image: crashnet1 Youtube screen grab)

The IIHS noted that the original and updated Model Ses tested had identical structures, but the test of the newer car actually produced a greater intrusion into the driver's compartment because the displacement of the left-front wheel in the crash was inconsistent.

Maximum intrusion increased from less than 2 inches to 11 inches in the lower part and to 5 inches at the instrument panel in the second test.

The first test produced a top rating of Good for structural integrity, the institute wrote, while the test of the updated car earned it only an Acceptable rating.

But the IIHS combined those two structural ratings—which led to an Acceptable result for both the structural-integrity and overall Model S ratings.

CHECK OUT: Tesla Autopilot investigation closed by NHTSA, will continue to monitor (Jan 2017)

The left-front corner of the battery case under the passenger compartment was also damaged by the greater deformation found in the second test, though the IIHS noted that damage was in an area without lithium-ion cells, so it didn't affect the ultimate rating.

However, versions of the Model S with higher-capacity batteries may have cells in that area, although Tesla told the institute that the structure of the battery pack differs as well—so those versions (presumably those with 100-kilowatt-hour batteries) are specifically not covered by this rating.

The agency also noted:

The Model S is only available with headlights that earn a poor rating and hasn't been rated yet for front crash prevention. While automatic braking comes standard, the software for the feature was only recently activated.

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