The 2023 Nissan Z has a limited top speed of 155 mph (250 km/h) but how fast can it actually go when pushed to its limits?

In a bid to answer that question, a crew of Japanese car testers put the Z through its paces on a slopped track. Details about the Z used in the test are unclear but it reportedly benefits from a tune, likely courtesy of GReddy based on the large stickers running along the car’s sides. It’s safe to assume that the top speed limiter has also been removed.

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Onboard footage from the test shows that the driver was able to push the car through to 285 km/h or 177 mph. That wasn’t the top speed displayed on the digital instrument cluster either and was instead a GPS-verified speed.

Without knowing just how much power the tune has added to this Z, it is hard to know just how fast a bone-stock Z could go if the limiter was removed but we suspect it is probably somewhere between 160 mph (257 km/h) and 170 mph (273 km/h).

In standard guise, the 3.0-liter twin-turbocharged V6 of the 2023 Z pumps out 400 hp at 6,400 rpm and 350 lb-ft (474 Nm) of torque between 1,600 and 5,600 rpm. The engine is capable of much more than this, so much so that AMS Performance recently lifted a Z to 452 hp and 523 lb-ft (709 Nm) at the rear wheels with nothing more than a tune, an aftermarket exhaust, and high octane race fuel.