Quote:
If you put a A12 in a bodyshell and for example a FJ20DE in another bodyshell and both car's power to mass ratio is the same, will they perform from 0 to 100km/h the same ?
Yes, more of less. The power/weight ratio will be the same, so the performance will be similar.
Now, if you look at it this way it makes some sense:
A 300 HP chrysler hemi (at 750 pounds)
vs.
A 300 HP CA18DET (at 282 pounds)
In this case, the CA-powered 1200 vehicle in total will be lighter, therefore faster. Lighter engine, lighter tranny, lighter rear axle. Granted, you could build up the Hemi to more than 300 HP ... but remember that original hemis were less than 300 HP net from the factory.