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Originally Posted by Blueclyde
That Romeo plant is 6 miles due North of where I live.
GM rates at "Net" power and that is still flywheel power on an engine dyno. To keep it simple let's just say that the power is measured using all of the "ancillary" systems it would have on it when installed in the vehcile. This would include air intake syetm (air filter box and piping), FEAD and the exhaust system, including the resultant restrictions. Many manufacturers rate "Gross" power which usually does not include any of those systems/restruictions. Net power is always less than Gross power for a given engine, and it could be as much as 5% less. This is a general description and I'm not sure what the acutal gross numbers for the LSA in the ZL1 but I know GM rates at Net and certifies this with an outside party. GM ratings show the power available with the driver's butt in the seat.
Not sure what Ford does but I would bet it is Gross power.
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The GT500 was tested with all the accessories on the engine.
And a net hp does not give you the power available with the driver's butt in the seat. A chassis dyno rating would be needed for that.