Deinterlace patch

Last update: October 9, 2021

A code disabling interlacing in the game, resulting in a sharper image. In the full version of Gran Turismo 4, the code enables Progressive output during races, same as a 480p output in NTSC versions.

For this code to function correctly in PCSX2, disable any deinterlace filters in the emulator!


Before/After

For a deinterlace patch for a NTSC-U version, see No interlacing codes on PCSX2 forums. A modified version from me might come later, since the existing NTSC-U deinterlace patch makes menus render at 30 FPS.

Setup instructions

US NTSC-U (GT4 Online)
EU PAL
JP NTSC-J (GT4 First Preview)


Adjusted triggers sensitivity

Last update: October 9, 2021

Since Gran Turismo games have always offered full control remapping, it’s possible to utilize triggers on modern controllers for throttle/brake, much like most modern games do. However, unlike in newer Gran Turismos, doing this in the PS2 games results in a mediocre experience – analog sensitivity is tailored for analog buttons of the DualShock 2 controller, and therefore inputs are heavily scaled. In practice, this means that anything over ~half the trigger press is already registered as a 100% input, so precise throttle control is hard. With this code, I’ve removed this scaling as much as reasonably possible, so now 100% input registers from a near full press of the trigger, therefore making the experience closer to how the later Gran Turismo games handle it.

Setup instructions

US NTSC-U US NTSC-U (GT4 Online)
EU PAL


GT3-like chase camera

Last update: March 15, 2022

A Gran Turismo 3-like chase camera that swings to the sides more than the final camera.

Setup instructions

US NTSC-U US NTSC-U (GT4 Online)
EU PAL


Far chase camera

Last update: March 15, 2022

A new in-race camera mode from Gran Turismo 4 Prologue and Gran Turismo 4 First Preview.

Setup instructions

US NTSC-U US NTSC-U (GT4 Online)
EU PAL


Adjustable units

Last update: October 9, 2021

This cheat code applies only to the First Preview demo. Final Gran Turismo 4 versions allow selecting units from the options menu.

We had to wait until Gran Turismo 4 to have a proper measurement units selection menu in the game. Before that units were locked to the specific game version, most notably locking NTSC-U versions of the games to use imperial units. While in Gran Turismo 1 and 2 units were fully hardcoded, turns out Gran Turismo 3 and later include code handling multiple speed, power, and torque units, although they are predetermined by the user’s choice of language.

With these codes, measurement units may be freely picked, just like in Gran Turismo 4. Whether it means using metric units in the NTSC-U versions, or imperial in PAL versions, the cheat code can be modified to force any selection of such.

Available units:

  • Power:
    • 0 - PS
    • 1 - HP
    • 2 - BHP
    • 3 - CV
    • 4 - kW
    • 5 - PF
  • Torque:
    • 0 - kgf.m
    • 1 - ft.lb
    • 2 - NM

Setup instructions

JP NTSC-J (GT4 First Preview)