Quote:
Originally Posted by Dragoneye
Yeah, I'm sorry -- there's internal testing and validation, and then there's SAE certification which makes things "official", and allows the company to put the little "SAE" logo next to their dyno graphs. This ensures there's no 'underrating', or 'cheating' on advertised power/torque. All SAE hp/tq figures are accurate to within (I think) 5% allowing for manufacturing variables.
They need to pay the society for the service, though - you're right: an expert/representative actually stands right there as it happens...GM has opted to have all their powertrains SAE certified.
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The SAE certification process validates an engine to make
+-1% of it's rated power. It's a VERY small window.