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Originally Posted by BlkGS
That's hearsay. While some German cars are advertised using their whp, that's far from consistent or the standard. German manufacturers were also guilty of sending non production tune ringers to get an advantage during testing. And none of the other countries did this, it was almost exclusively BMW and Audi/VW. Nobody has ever heard of an underrated power Jaguar or Volvo, lol.
GM also has a history of underrating motors, especially LS ones.y belief is that's more to account for manufacturing variation than anything, they rate them for the lowest potential output (which is what the Germans claim is the case, that they rate their motors at "worst case, high altitude, high temperature, and shit DA basically). Granted, GM underrating was 10-15 HP Max, whereas my X5 M50 is rated for like 80 crank HP less than it actually makes.
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All you need to do is look at the OEM dynos. If they arent specifying SAE at the crank, whatever other HP number you are comparing to is apples to oranges. Not the same thing. GM does claim SAE, but many others, especially euro, do not.
My LT1 is SAE rated for 455hp. It dynos about 401 at the wheels. There is nothing underrated about that.