Gran Turismo 4 Modding Discussion

[Memesbro]

You would have to look up the exact details of whichever modifications you had made to your console to run copied games, but there's a decent chance it will bypass region checks. Anything I know about ways to modify PS2 consoles is 20 years out of date though.

I have made absolutely none

 

[Johnny Caisse]

Does the editor even run?
If it doesn't, then you'd need somebody else to help. I'm on an older Windows so may not be familiar with how it works on newer versions. The .zip file from https://github.com/Nenkai/GT4SaveEditor/releases should contain an executable, which is the editor itself. Extract the app before running it.
If it does open, then you'd need to extract the content of the Spec II save for the editor to modify.

Disclaimer: I play on PS2 and the following is how I modify my saves so PCSX2 may work differently (instructions from https://github.com/Nenkai/GT4SaveEditor/releases/tag/0.6.0 maybe helpful). Regardless, it's crucial to make a backup of the memory card file before continuing. I'd simply zip it. A corrupted save or MC file is on you from here on out.

A memory card file may contain saves of multiple games. A GT4OPB save is BASCUS-97436GAMEDATA so this is what you'd be working on.
1. Run MyMC: "Open MC1", open the .bin save file, select the BASCUS-97436GAMEDATA, "Export save". Leave the app open.
2. Run PS2 Save Builder: File, Open, open the exported .psu file, select both BASCUS-97436GAMEDATA and garage, right-click, Extract, save. Leave the app open.
3. Run Nenkai's editor and open the location where Builder extracted those 2 files to. Modify whatever you want, then save. I recommend saving to a different location in case your modification isn't compatible with the game because the editor was not updated for Spec II.
4. In Builder, delete both source BASCUS-97436GAMEDATA and garage, leaving you with the 2 icon files. Drag and drop both modified files to builder. Save as either AR MAX v3 (.max) or Code Breaker (.cbs) format. Exit when done.
5. In MyMC, delete the source save (Warning: this actually deletes the save from the MC file so check if you've made its backup), "Import to MC1", open either the .max or .cbs file. Note the updated "Last Modified" time. "Close MC1" after you're sure that the save has been applied. Exit when done.

I recommend to delete the exported .psu file from step 1 after you're sure that the modification is working. There is a bug with my MyMC copy where a future export doesn't overwrite an existing .psu.
You can also delete the 2 extracted files from step 2 or the saved files from step 3 after done with editing.
Regarding the editor, I noticed that modifying anything unavailable/removed in OPB/Spec II may glitch the game so I'd edit only what's needed and only an item at a time. Iirc, the "Withdrawn credits" breaks the cheat shortcuts.

Y-yeah... I'm sorry, I am clueless. TheAdmiester? Do you think you could please add a way to use something similar to paint change to reset cars that can't change colors like those that change colors can be resetted by changing paint? I'll be patient. It's okay too if it's not possible.

 

[60fpshacks]

I have made absolutely none

If you prefer to use DVD over loading games from solid-state devices, look up PS2 Free DVD Boot.

 

[VanessaMagick]

Does anyone know if the palette indicators... y'know, these things that show the colour of the car...

... can be changed at all? From the looks of it they don't have a bespoke texture. I've been enjoying making custom liveries for GT4 but can't figure out a way to change these to match.

 

[Memesbro]

If you prefer to use DVD over loading games from solid-state devices, look up PS2 Free DVD Boot.

I have an old PS2, I.e. the big boxy one

 

[Johnny Caisse]

Just wondering, would engine swap be possible at some point or is it like GT2 A-Spec Project where it's impossible?

If it ever was possible I wouldn't mind waiting.

 

[Dave A]

I would imagine it's possible in a convoluted way where you are essentially replacing the car with a different car with it's own different specs that include the new engine. But you'd lose any parts you've already bought for the car prior to the change. If it can be done, I would imagine it would be a bit like the paint shop feature that @TheAdmiester added.

 

[TheAdmiester]

I would imagine it's possible in a convoluted way where you are essentially replacing the car with a different car with it's own different specs that include the new engine. But you'd lose any parts you've already bought for the car prior to the change. If it can be done, I would imagine it would be a bit like the paint shop feature that @TheAdmiester added.

Effectively impossible as a freely swappable part, but in theory it would be possible in terms of adding a duplicate car with a pre-swapped engine, then having an engine swap menu where it goes "here you go, you've swapped your engine!" while it replaces the car behind the scenes. It would have to be manually set up per-car and runs the risk of making the game's database too big though.

 

[60fpshacks]

Just wondering, would engine swap be possible at some point or is it like GT2 A-Spec Project where it's impossible?

If it ever was possible I wouldn't mind waiting.

It's not impossible on GT2, at least with memory hacking. I made this code for GT2 1.0 USA some years ago, but never publicly posted it before now.

Car Garage Slot 10 Turbo Kit ID
801CD5AC 024A
I am not 100 percent sure, but I think this may be the (stage 4) turbo kit for the Mitsubishi GTO or the Toyota Supra JZA80.
Buy an Escudo Pikes Peak and put it in Garage Slot 10 you will have about 2000HP or more, or somewhere close to it. You may need to first buy a turbo kit (at least for other cars) so the game knows to check the value before you enable the code but I cannot be sure.

 

[TheAdmiester]

It's not impossible on GT2, at least with memory hacking. I made this code for GT2 1.0 USA some years ago, but never publicly posted it before now.

Car Garage Slot 10 Turbo Kit ID
801CD5AC 024A
I am not 100 percent sure, but I think this may be the (stage 4) turbo kit for the Mitsubishi GTO or the Toyota Supra JZA80.
Buy an Escudo Pikes Peak and put it in Garage Slot 10 you will have about 2000HP or more, or somewhere close to it. You may need to first buy a turbo kit (at least for other cars) so the game knows to check the value before you enable the code but I cannot be sure.

To be fair there's quite a big difference between a memory hack and an actual in-game feature. Hybriding has been possible for decades across just about every GT, but a user-friendly feature as part of a mod is an entirely different story.

 

[TheKrzysiek]

How difficult would it be to edit which cars appear in each cup?

Each time I come back to this game, the main annoyance is having to reset the championships until I get a balanced grid, so it'd be nice to remove the cars that are a lot faster or slower than the rest.

 

[TheAdmiester]

How difficult would it be to edit which cars appear in each cup?

Each time I come back to this game, the main annoyance is having to reset the championships until I get a balanced grid, so it'd be nice to remove the cars that are a lot faster or slower than the rest.

It's not difficult but I don't think there are any particularly painful outliers anymore. Some of the particularly egregious ones like the Buick Special have already been moved, but outside of that I don't want to round off the AI variety too much.