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Er, If you had a clue about the GTR you would know the 2009 had a hand built engine assembled by one technician in the "clean room" of the yokohama plant and when engines arent built by a machine their horspowers are never the same
If you had a clue about what hand-built means in terms of engines, you would actually spell horsepower correctly.
Handbuilding engines allows the company to ensure that they meet a more exacting standard than machine-assembly. In other words, valve and piston clearances are more tightly controlled and there's less variance in build quality than in regular machine-assembled engines, which can vary in terms of power very wildly... about ten percent or so for most roadgoing engines.
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The reason you think that the R35 engines make wildly differing power is because idiots with laptops and digital cameras keep posting dynos of the R35 on the internet "proving" the engine makes this or that hp. Conveniently ignoring the fact that different dynos can give readouts of the exact same car that are 100 hp higher or lower than others.
The GT-R (pre-2011) consistently makes 406-407 hp on Mustang and comparable brake dynos. It consistently makes 425-435 (or something like that) on Dynojets. It consistently makes 450-470 on Dasteks and Dynapacks... though the 475 on the Dynapack is due to a hilariously erroneous application of torque-correction factors.
This is consistent with all other cars... Mine makes almost nothing on the Mustang, around 130-140 on the Dynojet, 140-150 on the Dastek and 150+ on the Dynapack. Yes. Dyno readouts are incredibly varied.
There are still variances, but these are due to the misapplication of SAE corrections. You can see where incorrectly large SAE corrections have been applied by the dyno operator, because boost levels are much different from other dynos, as the GT-R varies boost and fueling due to ambient conditions.
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If you think dynos on the internet prove that all these GT-Rs, despite doing eerily similar 11+ second drag passes stock (launch control off), are making up to 100 hp more or less compared to each other... then you don't know dynos.
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