The type of cars that you can add racing modifications on (at least that I know of):
P Acura NSX RM '91
P Chevrolet Camaro SS RM '10
P Chevrolet Camaro Z28 RM '69
P Chevrolet Corvette Z06 (C6) RM '06
P Chevrolet Corvette ZR1 (C6) RM '09
P Dodge Challenger R/T RM '70
P Honda CIVIC TYPE R (EK) RM '97
P Honda INTEGRA TYPE R (DC5) RM '04
P Lexus IS F RM '07
P Lotus Elise RM '96
P Lotus Elise 111R RM '04
P Mitsubishi Lancer Evolution IX GSR RM '05
P Nissan SILVIA spec-R AERO (S15) RM '02
P Subaru IMPREZA Sedan WRX STI spec C Type RA RM '05
P Suzuki Cappuccino (EA21R) RM '95
P TVR Tuscan Speed 6 RM '00
P Volkswagen Golf IV GTI RM '01
Do loads of races and sell useless cars
From experience of seeing it most of the time i think its to do where the engine is in the car Mr( f1 cars etc.) mid engine and fr meaning the front
gran tourismo omologato a standard car with factory modifications that is approved (omologato) to be entered in the gran tourismo series of motor racing
Gran Turismo 5 its not out yet though its gonna have +1,000 cars in it forza motorsport 3 is currently the one so wait for gran turismo 5
it stands for gran sport racing
When you see GTR on cars is means Gran Turismo Racing.. The manufactures that provide these cars are the most popular Mercedez-Benz. Ultima Sports Limited also manufacture GTR cars.
Gran turismo is so much better they have been out longer than forza, forza have just tried to copy and make better and failed. Gt5 has so much more car makes and cars in general. Forza is more of a street racing game, dragging, as soon as I hear that need for speed comes to mind. Body kits, need for speed again. Gran tursimo is just strictly racing and made for speed and gran turismo has so many faster cars. Gran tursimo even has a car named after them, masarati gran turismo, sounds good, imagine masarati forza, doesn't sound appeling. I can go on and on but that will do. Gran tursimo is better, better cars and graphics. Gran turismo is the game for motorsport cars not street cars. Buy need need for speed instead of forza I would rather.
Yes there are formula 1 cars in gran turismo psp.
Some But They Will Have A Range Of New Cars That Have Come Out Throughout The Years That Gran Turismo 4 Has Been Out.
The first Gran Turismo had 11 courses and 178 cars
There are 720 cars in Gran Turismo 4, from 80 different manufacturers.
I really cant tell you but there are 1031 cars in the game and if you go to gran turismo.com you can look at the full car list