The claimed top speed run of the SSC Tuatara has been called into question, forcing the automaker to admit that video reportedly showing the car hit 331 mph (532 km/h) was inaccurate.

Earlier this week, a handle of prominent YouTubers called into question the video. In these videos, (viewable below) they assert that based on the video released and the location of the run, it was simply impossible for the car to be traveling as fast as the telemetry system overlaid on the clip indicated.

In short, the YouTubers measured the distances and landmarks on Google Maps where the record-setting run took place and compared them to the video, concluding that the car was traveling significantly slower than the telemetry would have you believe.

In response to these videos and reports across social media and various forums, SSC released a statement on Monday claiming that “globally respected GPS data-measurement manufacturer” Dewetron had validated the Tuatara’s claim of a two-way average top speed run of 316.11 mph (508.73 km/h). Shortly after, Dewetron released its own statement, revealing this was not true.

“Despite the information published on the website of SSC North America as well as on several related and non-related YouTube channels, DEWETRON did not validate any data from world record attempts or preceding tests,” the statement reads. “Nobody of DEWETRON’s employees was present during the test drive or involved in the associated preparations. Since the results of measurement data highly rely on the right setup, on the regular calibration of the systems and sensors in use as well as on many other parameters, we are not able to guarantee the accuracy or correctness of the outcome. As of this moment, DEWETRON did not receive the measurement file of the test drive. As a result of the absence during the test drive paired with the missing data, DEWETRON is not able to make any further statements about the world record attempt under question.”

Read More: SSC Tuatara Hits Mind-Blowing 331 MPH, Is Officially The World’s Fastest Production Car

Dewetron did clarify that it did provide remote training to SSC about how to use and configure its GPS system and software.

SSC North America chief executive Jerod Shelby has since released a statement of his own, admitting that the video of the run “had been substantially incorrect” but stated the speeds “and the numbers are indeed on our side.”

So, where does this leave us? Well, the onus is still very much on SSC to prove that its top speed runs were legitimate. All we have at the moment is an inaccurate video and statements from SSC defending its top speed claim. Expect to hear more on this story as it develops.

Full Jerod Shelby statement:

On October 10, 2020, SSC North America realized a dream that was a decade in the making, when our Tuatara hypercar achieved an average top speed of 316.11 MPH.

In the days since, there has been a swirl of interest and speculation about how and whether the Tuatara had achieved that speed.

The good news: we did it, and the numbers are indeed on our side.
The bad news: only after the fact did we realize that the depiction of the speed run, in video form, had been substantially incorrect.

The following is a long explanation of what and how this happened, to the extent we now know. I hope it will serve to build trust in the SSC team, and in the exceptional feat the Tuatara has earned.

The video
Three years ago, SSC began working with Driven Studios, a video team to document what seemed like every waking moment of the Tuatara hypercar and those who’ve created it. They’ve since interviewed virtually every team member and consultant, captured the car in build and throughout extensive testing, and have played a key role in not only capturing but in producing the record run on October 10 in Pahrump, Nevada. They have become a trusted partner of the SSC family.

On the big day, October 10, there were video cameras everywhere — in the cockpit, on the ground, and even secured on a helicopter a low-flying T33 to capture the car at speed. The morning of the run, the record was achieved, we were over the moon. We kept the news under embargo until October 19, with hopes of releasing a video to accompany the press release. On October 19, the day the news broke, we thought there were two videos that had been released — one from the cockpit, with data of the speed run overlaid, and another video of b-roll running footage. The cockpit video was shared with Top Gear, as well as on the SSC and Driven+ YouTube pages.

Somehow, there was a mixup on the editing side, and I regret to admit that the SSC team hadn’t double-checked the accuracy of the video before it was released. We also hadn’t realized that not one, but two different cockpit videos existed, and were shared with the world.
Hypercar fans have quickly cried foul, and we hadn’t immediately responded, because we had not realized the inconsistencies — that there were two videos, each with inaccurate information — that had been shared. This was not our intention. Like me, the head of the production team had not initially realized these issues, and has brought on technical partners to identify the cause of the inconsistency. At first glance, it appears that the videos released have differences in where the editors had overlaid the data logger (which displays speed), in relation to the car’s location on the run. That variance in ‘sync points’ accounts for differing records of the run.

While we had never intended for the video captured to play the role of legitimizing the run, we are regretful that the videos shared were not an accurate representation of what happened on October 10. Driven Studios does have extensive footage of everything that transpired and is working with SSC to release the actual footage in its simplest form. We’ll share that as soon as it’s available.

The Car
On the day of the speed run, SSC used Dewetron equipment to track the Tuatara, and verify its speed, as measured by an average of 15 satellites across the two runs. We chose Dewetron for the sophistication of its equipment, and using that has given us confidence in the accuracy of the car’s measured speed.

People have sought additional details, which hadn’t provided in earlier press materials, and those technical specifications are listed below:

Tutara (Top Speed Model) Tech Specs
Ratios/Speed, using the 2.92 final-drive ratio
Gear Ratios/Top Speed (Gears 1-6 have 8,800 RPM REV LIMIT)
1st Gear: 3.133 / 80.56 MPH
2nd Gear: 2.100 / 120.18 MPH
3rd Gear: 1.520 / 166.04 MPH
4th Gear: 1.172 / 215.34 MPH
5th Gear: .941 / 268.21 MPH
6th Gear: .757 / 333.4 MPH @8800 *
7th Gear: .625 / 353.33 MPH (Estimated max @7,700RPM in 7th gear – Designed as mainly an overdrive highway cruising gear)
* FYI: Cross reference validations from data log-

Oliver is traveling at 236mph when he shifts from 5th to 6th at 7,700RPM (which tracks almost exactly to the gear-ratio data) and he pushed close to the top of 6th achieving 331.1 MPH at 8,600 RPM which tracks with our theoretical of 333.4mph @ 8800 RPM.

Aerodynamic Specs:
Drag goes from 0.279 up to 0.314 at 311mph (500kph)
Car is producing approx. 770lbs of downforce at 311mph
It is calculated that car needs 1,473HP to achieve 311mph (500kph)
In order to calculate the required power the following assumptions were made:
• The rolling resistance coefficient of the tires has been obtained from the manufacturer (Michelin Pilot Sport Cup 2) declared energy class: E.
• The overall drivetrain efficiency (from crankshaft to wheel) has been set to 94%.
• The air density has been set to 1,205 kg/m3 (which is found at 20°C at sea level).
• The vehicle mass has been set to 1474 kg = 1384 kg curb weight + 90 kg driver.

Tires:
Michelin Pilot Sport Cup 2
Rear Tire Diameter / Circumference: 345/30ZR20
Normal Running Pressure = 35psi
88.5” Circumference
28.185” Diameter
WORLD RECORD RUNNING PRESSURE = 49psi
89.125” Circumference
28.38” Diameter

How the Speed Was Measured
The SSC team received a piece of Dewetron equipment for its use in the speed run. The SSC team was trained remotely (due to COVID) on the use of that equipment. The Dewetron equipment includes sensors placed in the vehicle, that tracked an average of 15 satellites over the course of the Tuatara top speed run. Two independent witnesses, not affiliated with SSC nor Dewetron, were on-site to view the speeds measured by the Dewetron equipment. SSC intends to submit proof of what those witnesses had seen on the Dewetron equipment to Guinness for verification. On October 22, Dewetron sent a letter to SSC confirming the accuracy of the equipment and speed sensor they had provided to SSC, and that letter will also be submitted to Guinness as part of application for the world top speed record.

As an additional step, SSC is in the process of submitting the Dewetron equipment and speed sensor for further analysis and verification of that equipment’s accuracy.