Bugs:Gran Turismo (PlayStation)
This page details bugs of Gran Turismo (PlayStation).
Despite an American promotion for the game claiming "other racing games are merely bugs", the first Gran Turismo had its own share of bugs.
Contents
Collision Glitch
In the original Japanese version and some US demos, it is possible to drive straight into a wall and gain speed rapidly. Sometimes, especially if used in Test Course (only possible in the Japanese version, as the US demos only feature Clubman Stage Route 5), this can result in the car flying into and getting stuck in the sky, requiring the race to be restarted. This glitch only happens with 4WD cars.
AI Opponent With Wrong Performance
There are two AI opponent cars which are missing car setups, causing them to fall back to the performance of the first car in the opponent list for that particular event:
- The Mazda Eunos Roadster Arcade that appears as an opponent car in Arcade Mode Class C is missing a car setup entirely, and falls back to using the physics of the Toyota Starlet Glanza V.
- The Toyota Celica GT-Four opponent that appears in Gran Turismo World Cup, Grand Valley 300km, and All-Night 1 had its car setup replaced with one for the duplicate Celica GT-Four (tceen) in the US and PAL versions of the game. As a result, in those versions it falls back to using the physics data of the much less powerful and front-wheel-drive Toyota Corona Exiv 200GT.
Subaru Impreza Mixups
The various 1994 and 1995 Subaru Impreza models are swapped around in multiple places in the game. Initially, in the Trial Version, their names were swapped in most places. In the final retail versions of the game, only the race/results names for their racing-modified variants were switched, along with every appearance of those models in the Used Car list of the Subaru dealership.
| Car ID | Car name (GT Mode menus) | Replaced in Used Car list by | Name when race modified |
|---|---|---|---|
| sipzn | IMPREZA '94 Sedan WRX | sipwn - IMPREZA '94 WagonWRX | [R]IMPREZA'95SD STiIII |
| sipwn | IMPREZA '94 WagonWRX | siptn - IMPREZA '95 Wagon WRX-STi version II | [R]IMPREZA'94SD WRX |
| sipsn | IMPREZA '95 Sedan WRX-STi version II | sipzn - IMPREZA '94 Sedan WRX | [R]IMPREZA'95WG STiII |
| siptn | IMPREZA '95 Wagon WRX-STi version II | sipsn - IMPREZA '95 Sedan WRX-STi version II | [R]IMPREZA'94WG WRX |
The race-modified '94 Sedan WRX has an additional typo in its race name, as the 1995 car is the STi Version II, not the 1996 STi Version III.
The swapped Used Car list entries lead to some rather weird trends, such as the newer and tuned '95 Wagon WRX-STi (intended to be the '94 Wagon WRX) being sold for a lot less money than the standard '94 Sedan WRX (intended to be the '95 Sedan WRX-STi). Also, as the various models don't share the same set of paint colors, the swap means that two of the colors on the '94 Sedan WRX (Black Mica and Cosmic Blue) are completely unobtainable (as the '95 Sedan WRX-STi that it is replacing doesn't offer those colors), and that all three of the other models appear multiple times in the list with color IDs that they don't support, causing them to fall back to their default colors of Feather White or Light Silver Metallic.
Improper 4WD Behavior
Several cars marked as 4WD in the game behave like a front-wheel drive car (such as being prone to wheelspin) as their torque split is set to zero (100% front bias). These are:
- Nissan Pulsar GTi-R
- Mitsubishi Lancer Evolution III
- Mitsubishi Galant VR-4
- Toyota Celica GT-Four
The duplicate Celica GT-Four in the US and PAL versions (tceen) is not affected, and appears to be an attempt to fix the bug.
A video demonstrating the behaviors of these cars can be seen on the right.
Honda NSX Rear Priority
All Honda/Acura NSX models (both road-going and race cars) have an incorrect Z-byte priority setting on the rear area that allows the car's rear wheels to appear through the car's trunk/engine bay area. This seems to only occur in races, however.
Race Car Suspension Type Display Issue
In the international versions, the suspension type of race cars in the fitted parts list of the garage appears as "NEED-JA.HTM" (the name of the page informing the player about the car nationality requirement for the US-Japanese Sports Car Championship). This occurs due to the fact that suspension parts have two separate upgrade levels, one controlling the displayed name, and the other controlling whether the player can adjust their settings.
The built-in, adjustable suspension parts installed on race cars are labelled as stock parts (level -1) for their displayed upgrade level, but are set to fully adjustable (2) for their functional upgrade level, unlike non-stock racing suspension parts for road cars purchased from the parts shops which have both a displayed and functional level of 2.
Stock parts typically do not appear in the installed parts list, but this check actually inspects the functional upgrade level, which does not match the displayed upgrade level for the race cars. When attempting to look up the label for the part using the displayed upgrade level of -1, the game underflows a string array and ends up loading another string elsewhere in memory.
4WD Slowdown at High Speeds
A very specific combination of physics values can cause cars to struggle to accelerate in higher gears, or even decelerate. The car must be highly tuned with a lot of power, a lot of front downforce (race-modified), very low drivetrain inertia (fully upgraded flywheel and driveshaft), and Ferguson 4WD with a fixed torque split to the rear wheels. In practice, only the twin-turbo Mitsubishi GTO models can meet all of these criteria in normal gameplay, as the Nissan Skyline GT-R models use a different 4WD mode and other cars are either not 4WD or not powerful enough.
