Going by (SAE corrected) dynojet numbers, which have very little variance from shop to shop, and data I've acquired from half a dozen VQ37HR's...
***Dynojet derived whp and drivetrain loss***
Average power for 370Z or G37: 273 +/-5
Average power for Nismo version: 290 +/-5
Drive train losses for both AT and MT appear to be between 16.5% and 17.5%
So... if you want to get a good (SAE corrected, dnyojet based) estimate, take what your car puts down (on a dynojet) and divide by either .835 or .825.
So, if you make 300 whp on a dynojet with SAE correction, it makes (probably) somewhere around 359 - 363 bhp.
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