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The PP system has its foibles, it should be said.
Cars have "innate" PP ratings which seem governed by the age of the car (older cars = lower PP) and the drivetrain (from highest to lowest PP, I think it's MR, FR, 4W, RR, FF). The PP is then modified by, in order of most significant to least significant factor, weight (lower weight = higher PP), downforce (lower downforce = lower PP), power (lower power = lower PP) and torque (lower torque = lower PP).
However, precisely deciphering the PP system is very difficult. I can't tell you, for instance, how much PP you'll get for 5 more horsepower and 1 more lbft in a standard Honda S2000, only that, in general, an older S2000 has a lower PP rating even if it's identical in specs to a newer one (compare '01 and '06).
I've been logging data on PP on certain cars and encoded - the GTP user behind gt5cars.net - has been trying his damnedest to work out the method behind the PP madness, but we're not there yet.
I think there is no "age" factor in the PP system. Old cars just generally have worse gearboxes and less mechanical grip/downforce.
You can even feel the differences with new cars.
Just check up the stats of a minimal-weight Gallardo at 575PP and a 458 Italia (both cars also maxed out downforce). The Gallardo weights more then 100kg less and has more then 20kW more power, but stillt he same PP.
I also found out another interesting thing:
When I bought my first Enzo in GT5, I played around with the weight ballast option a little bit, to erase the understeer. The PP of the car raised when I added ballast to the rear, it reached its maximum when I added 200kg to rear.
My conclusion:
The effect of in/decreasing downforce for the PP rating needs to be reworked. Its influence must be raised. Or just add a "track factor" (I remember years ago, when this game wasn`t released, amar suggested this) because on some tracks downforce is more important then on others.
A Enzo gets raped by the 458 at Suzuka (same PP levels) but is probably equal or faster on the Nordschleife.
IMO PD should also add the option to make the PP system like in GT5P, when tires affected the PP too. So you could race old cars + better tires against modern sports cars with bad tires.