Basically it is like a 1/4 mile app
You key in your engine data inside, hook your Iphone (make sure it is straight)
Then just hentam
The app will calculate your engine BHP base on how fast your 1/4 mile base on your engine capacity

I thought vehicle's curb weight is often specified in the car brochures (Heck, you can even find it in Wikipedia)?

Empty your boot and just add driver's weight to it can?

To me, benchmarking solely on hp alone is pure crap. In the real world, Power to weight ratio, 0-100 or quarter mile time are the benchmark. Whats the use having a 300 hp with a 2.5 tonne weight, when a sub 1tonne car with half the HP can easily out maneuver and perform better than the big hp car? Not to mention, a low HP car with a high torque makes urban driving much more fun.

The problem now is I am living at Sabah now.