Tesla CEO Elon Musk made a radical declare earlier this week in regards to the upcoming Roadster supercar, saying the corporate is aiming for a 0-60 mph time of less than one second. While many have since dismissed the declare, he does have an ally in Bugatt-Rimac CEO Mate Rimac—kind of.

When requested on his Facebook web page if he thought the under-one-second declare was plausible, Rimac responded with a shocking sure. “It is possible with thrusters,” he says within the Facebook remark. “We did the simulation.”

But there’s a important stipulation to go together with that affirmation.

“Problem is, you release the air in two to three seconds and then you have a lot of dead weight that you are carrying around (tanks, compressor, valves, nozzles etc.),” Rimac continues. “Same with fans—they just give you more grip but you need something like 30,000 newton-meters on the wheels to accelerate below one sec 0-100 km/h, which means you need massive motors, inverters, gearboxes, driveshafts, etc.”

Rimac additionally notes that the automotive must be “super light,” which isn’t sometimes the usual for battery-powered vehicles. Even his Rimac Nevera hypercar—which is able to hit 60 mph in beneath 2.0 seconds—weighs over 5,000 kilos.

“So thrusters are really the only way to go,” he says. “But they bring a lot of downsides as well.”

Tesla CEO Elon Musk recommended in 2018 that the Roadster would have “10 small rocket thrusters arranged seamlessly around the car.” That, in concept, can be the kind of thrust the Roadster wants to attain that sub-one-second 0-60 time. Although, it’s unclear how that may fare with the NHTSA.

We’ll have to attend and see if Elon’s claims come true. The new Tesla Roadster will reportedly debut later this 12 months.