iRacing, LFS, GTR (original version), rFactor, Nascar 2003.
- NetKar Pro
- GPL (grand prix legends)
- X Motor Racing
- GT Legends (Simbin/Blimey!)
- Historic GT & Touring Cars > GT Legends mod for rFactor
- Racer
- TORCS
Untill today, I never considered gran turismo to be a simulator. I'll have to wait and see what GT5 has to offer when it's released.
Sony/PD wants to make a mass selling game. Like others said, if they should make a hardcore sim, they commit suicide, commercially. GT is close to become a simulator though.
Little example: Last year (summer of 2008), I was trying to determine if GT5p had proper braking physics. It turned put that it hasn't. You can turn off ABS and the wheels of the car lock up under heavy braking BUT it was still possible to steer the car, even with locked front wheels. This is not how it works IRL.
I took the Ferrari on Suzuka, drove an entire lap to get enough speed on the back straight and applied full brakes at the end before the two right hand turns. ABS was turned off, the front wheels locked up
(you can hear the tires squeal) and turned the steering wheel from right to left to right to left to ...

After this test, I watched the replay and yes, sure enough, you can see that the front wheels locked up and it was still possible to steer. If PD can make a real car that can do that IRL, ABS is no more needed.
But that's not all. Low speed physics aren't correct. Weight transfer is definitely not correct.
The off track physics are still a joke in GT.
Please remember that I'm talking about all Gran Gurismos untill GT5p. I haven't tried GT5D TT because I don't have a PS3 anymore.
Other stuff that makes a game a sim:
Simulation of auto racing accurately in all it's aspects
- fuel usage, tire wear, tire pressure, punctures, grip, suspension settings, damage (structural, mechanical, electronical and electrical), tuning, etc ...
- flag rules
- Pit stops
- realistic and accurate car handling in all it's aspects (physics engine).
- accurate weight transfer
- like in iRacing, start with a less powerfull car in lower rated championships. Buy new cars and work your way up to higher championships.
- weather, day and night etc ...
- grip on the track much change due to the deposite of rubber/dirt on the asphalt. Rubber marbles on track like in GTR.
- wind, influencing the cars
- correct and realistic off track physics > sand box, grass etc ...
- a real sim should have a "steering wheel option" only, like in iRacing. It's possible to calibrate a joystick in iRacing (did it with the Attack3 form Logitec) but it's no were as accurate as a steering wheel.
- etc ...
My personal opinion is that GT is a driving and a racing simulator. You can
drive all sorts of standard passenger cars on different tracks. But you can also
race a race car online or against the AI on different tracks.
GT started out as
The Real Driving Simulator and I don't think that PD wants to change the title into
The Real Racing Simulator.