Quote:
Originally Posted by Stage IV
Quote:
Originally Posted by Railgun
Which is what any result should be given in.
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WHP is the enthusiasts common denominator, yes. Still though, dynos should only be used as a tuning tool. Begin with a baseline, progress from there with your various add-ons.
SAE certified figured are where it's at, IMO. If GM says the C7 Corvette is SAE 465, I'm convinced. if BMW says F90 is 600 HP, I ain't buying it. |
Not the entire population in the world lives in the US... SAE is an American organization with standards applied by US manufacturers. The UN has ECE stds that is used in Europe.
To get a car type approved and legal for sale in Europe it has to be tested by a independent technical service (test facility like TÜV, DEKRA etc). For type approval testing BMW have to provide a engine for independent dyno testing and the engine's power and torque figures (throughout the rev range) has to be within 1% of what BMW claims. Later on during production of the car, spot tests can be done and the power and torque figures then has to be within 5% of the claimed figures (to allow for tolerances and minor adjustments during a production run).
Btw, companies like BMW, Porsche, MB etc generally make two separate versions of their cars; The US model and ROW (Rest of world). Only the US model is compliant to FMVSS (which unlike ECE does not require independent testing of most regulatory acts).