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#1
07-26-2008, 10:14 PM
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Car Builders Hp Rating
Where do car makers get their hp ratings for their production cars. We all know it is not from the wheels. Do they all rate the same way ? where do they get the numbers
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#2
07-27-2008, 02:20 PM
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They are all supposed to rate the same way base on SAE standards.
Some manufacturers (including nissan) choose to rate their cars LOWER, but they cannot rate HIGHER. The actual horsepower is measured at the flywheel, before it goes through the transmission/driveshaft/wheels/etc.
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#4
07-31-2008, 04:23 PM
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by SAE standards it should be. Though you gotta remember the GT-R is hand built, everything is built custom for the engine after wards as well. They advertise 480hp but some have been tested as over 520hp. (that info I got from Top Gear).
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#5
07-31-2008, 04:35 PM
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factory hp numbers take into consideration drivetrain loss like mike mentioned. usually 15% for manuals and 20% for autos. so if you take dyno #s and multiply for loss -that should be about your crank hp.
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#6
07-31-2008, 07:00 PM
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If only someone measured the hp at the flywheel...
Of course that would require specialized equipment, but I'm sure porsche/GM/etc have already done it...
__________________
Riverside Infiniti Volume Sales mkang@riversideinfiniti.com 714.313.4228 cell Have questions? Call me! Parts toll free number: 800.919.8130 FS: 1994 3000GT VR-4 Twin Turbo, never modified!! $14,800 OBO FS: Samsung 40" 1080P LCD HDTV, pick-up only Quote:
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