I've learned on this forum that there's a new standard for measuring horsepower which is more stringent. The 2007 G35, as I understand is rated at 306HP under this new scheme.

I'm curious as to what the rating would be under the old scheme. Is there a conversion formula or is it much more complicated than that?

The Acura RL was listed at 300hp and now they're saying it's 280hp. Does that mean that the G35 would be more like 320hp under the old scheme?

 

The old "SAE horsepower" is no longer used because it gave a misleading number due to the fact that an engine was tested without any auxillary items installed like alternators, air cleaners or fans. "SAE net horsepower" is used to indicate the engine was tested with everything in place.

Google....know about it, tell a friend

 

the rev up 298hp engine makes 293hp in the new scheme and 280hp engine makes 275hp under the new scheme. both loss 5 hp, nissan didnt overate the engine nearly as bad as toyota and honda.

 

+ 1

 

depends on the cars really

 

Is that true though? I though the "old" method, or what is now described as Gross HP rating you described was changed out years ago-
I have a hard time believing that a adding alternator, AC, Power Steering, smog pump, and air cleaners would only cause a net drop of 5hp on the dyno.

 

Not all cars drop in power. The TSX and C6 Z06 for example gained 5HP from the new SAE standard. So, there's no real conversion calculation.