Famed Japanese powerhouse Amuse now unofficially has the first maybe-kinda 600+ hp Nissan GT-R (outside of the Nissan factory anyways). Nissan’s not-so-hacker-proof ECU was cracked and the boost was upped to 18psi (1.25 bar) using an HKS EVC5 boost controller. Also installed was a Amuse titanium muffler. The exact figures are 602hp and 576 ft-lbs of torque…
However, those numbers are not exactly 100% accurate. Amuse used some dyno math to account for a 10% drivetrain loss (which is apparently accurate), so the actual figures are around 548hp to the wheels (or in this case, the wheel hubs: numbers measured via the wheels would be even lower). In the picture above, notice the box where it says “TCF” (Torque Correction Factor); it should read 1 (effectively 1 to 1, no multiplier) for power to the wheels, however it is at 1.10, which basically multiples the power by 1.10 (548 * 1.10 = 602.8).
[Source: CBA-R35 Blog, et al]
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