Kiddie medal:
The small green and yellow object on the status screen under licenses is a license award given if you miss the bronze medal by .3 to .5 seconds. The game is selective when awarding the medal and it may take several attempts to earn one.

Motor Sports Land track:

Obtain all of the licenses, including the Super License and the Motor Sports Land track will become available in time trial mode on the arcade disc.

All tracks in arcade mode:

Obtain all licenses from simulation mode on disc two, including the super license.

Quicker settings:

When you are at the settings menu, you can set your gear ratios, damper bound, damper rebound, etc. by pressing L1 to make the notch move faster to the Left and R1 to make the notch move faster to the right.
Easy Rally Racing:

Buy the Escudo Pikes Peak version and use it to compete in any of the Rally Races to easily defeat your opponents.

Finding cars:
If you cannot find a certain car at in the used car lot, check back in about 10 days or more. The car you are looking for may be available. For example, the Mazda AZ-1 appears only on certain days in the lot.

Super License:
Earn all licenses (A, B, Intl. A, Intl. B, Intl. C) to unlock the "Super License" option on the license test menu..

Event Synthesizer race:

Earn the Super License to unlock the "Event Synthesizer" race in Gran Turismo League.

More laps in Max Speed Test:

To make your high speed increase during this test, turn around and drive backwards until you get your desired speed. Return to the correct direction and finish the race.

Increasing the number of days:

To easily increase the number of days in the game, just go to a race. When you are at the screen with the "Start Race" selection go to "Exit" and your days will increase by one.

Increasing completion percentage:

Each time you win a race you will earn 4.5% towards your total completion of the game.

Ending credits:

Win every race under Gran Turismo League for the ending credits on the Arcade disc.
Finish in first on all 21 tracks in arcade mode under the professional difficulty setting.

Escudo: Turn more easily:

Set the LSD as INITIAL 6 - Front, Rear 6; ACCL 56 - Front, Rear 10; DEC 10 - Front, Rear 56. The Escudo is a 4x4, as is the Imprezza. If you have a front-drive car, you simply set the LSD for the Front. If you have rear-drive car you set the rear setting. For a 4x4 set it as above. How much you put on depends on how you feel the car handles. The point is to make the car turn as quickly as possible. If your car turns quickly, it can straighten up quicker; and allows you to leave the corner as quickly as possible; putting your foot down. The LSD allows you to "slip/spin" the car into a corner, almost as in an uncontrolled spin. But before you spin out completely the LSD lets you drive through the spin. The turn is faster if you get the setting right. If you get the set-up right, you can beat a more powerful/lighter car when driving a smaller/heavier inferior one. If your car lacks straight-line speed, it can make up for it by fast cornering. Using the LSD you can tweak the car to do that, up to a point.

FedEx car:

Enter the Gran Turismo League race events until reaching the Pacific League races. Then enter the Midfield Raceway event and to be awarded with a R*Nissan 300ZX GTS FedEx race car.
Ford GT-90:
Use any car within the horsepower limits and finish the Seattle Circuit 100 mile in less than 1 hour and 1 minute. You have to run the race four to six times before getting the car.

GT-40:

Race and finish first at the last MR Cup race. You should win the car along with 15,000 credits.

Lancia Super Car:

Win the Laguna Seca Endurance our times to unlock the Lancia Super Car, which has 685 hp.

Lancia Statos:

Race at the Apricot Hill endurance three times. On your first two wins, you will receive a Viper GTS-R. On your third win, you will receive the Lancia Stratos. The preferred car for the endurance is the Opel Tigra Ice Racer. Note: The Lancia Stratos is for expert drivers.

Mark Martin's NASCAR #6 Ford Taurus:

To obtain this car you must first purchase a Ford Taurus and then perform the Racing modification.

Nissan R390 GT1 '97:

This car is obtainable in the Gran Turismo All Stars League, Laguna Seca. At first this car is a shocker with 351 hp, barely reaching 250 km per hour (approximately 156 mph) and handling like it is driving on ice, but it is worth quite a bit. Use the following settings to get it to hit 400+ km per hour (approximately 250+ mph), awesome acceleration, and an outstanding grip. Turbo Kit Stage 4, Computer chip, Port Grinding, Engine Balancing, -Racing Slicks (Super Soft), Gearbox (fully customized service), Weight Reduction Stage 3, Traction Control, Active Stability Control. Gear Ratios: 1st: 4.221, 2nd: 2.698, 3rd: 1.910, 4th: 1.423, 5th: 1.115, 6th: 0.920, Final: 2.500, Auto Setup: 23. LSD: Original Settings, ASC (Active Stability Control): 90, TCS (Traction Control System): 25. Note: When going into corners, hold the accelerator and brake at the same time. This prevents the car from sliding.

Subaru Impreza 22B/ Red or Yellow Evo5:

In order to get the Subaru Impreza 22B/ Red or Yellow Evo5 cars, you must win the third 4-Wheel Drive race using any 4-wheel drive car on a 9th day (19, 29, 39, etc.). Once you finish the race, you will be in a10th day, when the new cars on the used car lots. Go to the Subaru used car dealership to get the Impreza 22B or to the Mitsubishi used car dealership to get the different colored Lancer. Both cars can be found near the end of the list.

Toyota 2000GT:

Get the licenses from the original Gran Turismo, convert the data to Gran Turismo 2, then earn each license (including the Super License) without exiting the license screen (except when you pass all the tests). Purchase a good used car and enter the expert race on the event synthesizer. Race it until day 10. You should have over $111,000 by then. Go to the Toyota used car dealership and buy the 2000GT. It is not a great car, but it is the rarest in the game.Another way to get the Toyota 2000GT is to just go to the Toyota used car section. It is at the very bottom.

Pop a wheelie:

This trick only works with Nissan 180SX drag car. Set rear downforce to the highest setting, front downforce to lowest, and rear height to lowest. Set the gearbox settings to wide, and tires to hard on front and rear. Go to Laguna Seca race and leave the track. Drive as fast as possible. If you have enough speed, your car should get on its rear wheels, accelerate very fast, and go over 635 km/h.

Displacements:

You can do a stroke/bore up on the Austin Mini as well as the Skylines.

License test cars:

To get the following cars, you must get all gold on the given license.
Gold B: Spoon S2000 (J)
Gold A: Dodge Concept Car (red)
Gold IC: 3000GT LM Edition
Gold IB: del Sol LM Edition
Gold IA: FTO LM Edition
Gold S: Toyota GT-ONE Race Car ' 99

Hints:

One of the best cars in the game is the Audi TT Limited Edition. It is a special car that costs 1,000,000 credits. This car has excellent acceleration and handling. It can also go about 211 mph on the machine test max speed test.

You can drive 274.1 mph with the GT-One Road Car '98 on the max speed test. Use the following settings: Tires SS SS, Turbo Spec 4, Sping rate 20 20, Ride height: 55 95, Bound 10 10, Rebound 10 10, Camber 2.0 0.0, Toe in 0.0 0.0, Stab. 7 7, 1st 3.295. 2nd 2.047, 3rd 1.425,4th 1.046, 5th .809, 6th .660, final 3.35, auto 25, downforce 52 85, LSD I 16, LSD A 36, LSD D 26. Enter the turns low and make sure you keep the wheels turned left at all times during turn.

Buy a Honda S200 and equip it with all the options that you can buy, including weight reduction and racing modification. It will be the best handling car.

Buy a Audi S4and tune it to the max to get a 4WD car with 601 bhp and superb handling. Also try the 206 WRC Rally Car for 4WD and 480 bhp and the Mitsubishi 3000GT for fine handling, 4WD, with lots of power.

One of the fastest cars in the game is the Toyota GT-OONE with 975hp.
The Mini Cooper, if tuned to the max, is the best car in the game and is better than the Escudo Pikes Peak version.

A good cheap mid-powered car is the Mitsubishi Galant Super VR-4. You can get 460 hp in it. It is good to in the GT League and in the Luxury race.

The Audi S4 is a good car. Its maximum hp is 607, and has a top speed of 240 (only on the test track, racing against high speed cars). It will cost about 35,000 to 45,000. Tune it and go to the Tuned Car Championship.

The Suzuki Escudo is the fastest accelerating car by far. It is possible to get a 8.4 second run at 179mph on the 1/4 mile.

The Mitsubishi Evolution 4 or 5 is the best in handling and luxury sedan type races. With a horsepower of about 400 to 589, this car fully equipped to be a great car.

A good car to use is the Honda S-2000 Special in the East City. Set the rear stabilizer to the highest setting so the back end will not spin out on turns. It has good acceleration and speed.

Get a car that can compete in the 80's Sportscar races. Compete in the last race to win Drag Type A car that is worth 125,000 credits. You can race it in the tuned car races, but you have to set the rebound and stabilizer to the correct setting to keep the back end on the ground. This car is good at accelerating and excels at turning with the correct settings. It does not go faster than the Escudo Pikes Peak, but it is easier to get.

Get a Mazda R-X7 Special in East City for 1 million credits. Change the stabilizer settings to the highest setting to keep the back end on the ground. This car will excel in turning and top speed.

Hint:

Record times:
It is not possible to set record times on the simulation disc. The only way to set record times for a track is on the Arcade disc in time trial mode.

Drive 470 kph:
Get an S license, select arcade mode, and go to Motor Sport Land. Get your 180SX Drag (not the Skiline drag) -- it weighs under a ton. Go to the corner after the hill. Go flat tack so the reverse sign appears, and drive straight into the hill. You will go through it and just keep going (it will say off course). You will not be able to go fast if it is like your on the dirt. You will see mirages of the track and need the gearing right. This is why the map is so small. If you want to get back on the track, you must keep your green dot on the screen.
Better car performance:
On any car that has full racing gears, go to change parts menu and select "Gear". Make sure "Auto Setup" is set to "Wide" for more top end speed.
Changing the setup to "Wide" will result in more top end speed. Move the setup to "Close" for more acceleration. The only reason to change the setting is from track to track. For example, for the Test Track, set it all the way to the right. For tracks such as the Special R5 track, set it all the way to the left.

LSD settings:
For a rear-wheel drive machine, set up as follows:
Initial: 30 to 50.
Acceleration: 9 to 13 (depending on car)
Deceleration: 25 to 32
One would assume the opposite setting for a Front-Wheel Drive machine, and something of both for the Front and Rear wheels of a 4x4. Initial seems to sap the car's inertia, which is vital for control of a heavy machine. If you have bought a rather flabby Viper this is useful, so that you do not have to brake excessively in turns, and thus lose speed. Acl seems to be bad for a FR machine if this figure is high; it worsens spin-outs. Keep this low for FR machines. Decc is very useful for over-steering the car through corners. When set just right, say in a Viper, it swings the cars rear-end out, thus helping in turning. Also, to set up the Speed 12, you need to lighten the front damper setting (20 to 30); then do the above. You do not need the anti-spin devices once you have sussed out the LSD, which saves money.

Do not buy too many cars:
When entering the Special Events races, it is not necessary to have the same kind of car as the event specifies. (i.e. You do not need a muscle car to race in the Muscle Car Classic.) With the exception of the drivetrain specific events (FF, FR, MR, 4WD) and the Tuned/NA races, as long as your car meets the horsepower requirements, you do not need the kind of car that the title specifies. Basically, pick the car that you like the most, and race all of the races you can within the horsepower restrictions. Doing this means you do not have to buy a luxury sedan to compete in the Luxury Sedan Cup, etc.

More car indicator:
When you want to buy a car and you are browsing, make sure you look in the right hand corner of the screen. If an arrow points to the right, click on it to see more cars. This also works with some special models. (Example: Ford has four special models).

Rearrange cars in garage:
Press Start when browsing trough the list of cars to send the highlighted car to the top of the list.

Using soft or medium tires in Endurance Racing:
You can use soft and medium tires in combination in Endurance Racing without using only hard tires for durability. This depends on the type of car you use (MR, FF, FR, 4WD). You can use super-soft tires on the front wheels of FR and MR machines while using medium or hard tires on the rear wheels. But 4WD machines should generally use medium or hard tires. You do not need to use the most powerful car. Also, the competition during Endurance Mode are rather feeble; most suffer from spin outs. To make the Escudo turn more easily; set the LSD as - INITIAL - front 6, 6 on rear; ACCL 56 - front, 10 on rear; DEC 10 - front, 56 on rear.
When you are racing in an endurance event it does not matter what kind of racing slick tire you use because they all wear down at the same rate. You should use super soft tires for the best handling and performance.

Easier turning:
When in a turn, hit the brakes until your hear your tires squeal. Then, turn with the D-pad.
Information in this section was contributed by Tommertooon.

View opponent replay:
Press Up or Down while watching your own replay pad to select the car that you wish to see the replay from. Note: You must be racing against the CPU or another player for this trick to work.