Gran Turismo 4 Modding is here! GT4FS & SpecDB Editing Tutorial Full Walkthrough

In this video I cover how to make mods for Gran Turismo 4 using the specdb editor.
Tool Credits:
GT4FS: Nenkai, Razer2015, pez2k
SpecDB Editor: Nenkai, Razer2015
GT4 Modding tool links and info pack:
drive.google.com/file/d/1SI6P...
UltraISO:
drive.google.com/file/d/1FjjD...
GT4 Online Public Beta ISO:
ia902705.us.archive.org/view_...
00:00 - Intro
02:34 - Creating your GT4 modding directory
03:34 - Extracting the GT4 iso
04:09 - Decompressing the VOL
07:24 - Creating your mod folder
09:18 - Making mods for the game with specdb editor
12:43 - Appending / Re-compressing the VOL
14:27 - IML and IMS file
15:39 - Packing back into an ISO
17:35 - Running the modified game ISO
18:57 - Making subsequent edits to the game

[@caifabe8050]

i dont know how to mod and i dont really have the patience to learn how to mod but i love all of Silent's mods and he's doing a FANTASTIC thing for the community so im gonna watch this entire tutorial and give him the views anyway

[@johnsonsira2327]

I recently made that modification of the GT4.VOL but this time replacing the old sounds of the GT3 cars. I used several programs the GT3VOL EXTRACTOR and the GT4FS respectively, but I extracted the sounds of the GT4 prologue where the old sounds of GT3 came from and replacing the sounds of the cars from it to GT4

[@Ryet9]

perfectly explained thank you 🏎

[@Appii]

yey stuff!

[@ScarLeRenard]

By the way, you can click on the folder path on the Windows explorer and type cmd, when pressing " Enter " it will run the CMD in the desired folder, just so you know

[@yomo68]

Thank you for this...would this make it possible to increase the tire grip values of the garage cars?

[@tuinderdome]

Thank you very much for this video, does anyone know how to change the amount of laps? I've tried changing the Laps column in the RACE table, but that didn't work

[@dragunova5063]

Can't go trough the first disclaimer, I saw in the readme file that the problem could be related to .vol edit, but even with the original .vol, it wont work .. Interesting thing is that I can load a savestate from the unmodded game and it runs fine, but, I can't come back to main menu, got the red loading icon .. Also, I'm using EU version on the game and generated IML file several times with "CDRom generator" and "Iml2Iso" .. don't know what's wrong here

[@itz_Metaa]

All I wish for is to be able to play the single player locked maps like Chamonix or Grand canyon in 2p arcade. Is that even possible?

[@ceelokstah3303]

is it possible to change the car sounds ?

[@OctavioPlata]

how can I change the soundtracks?

[@miguelc2840]

I'm trying to add my own music files that plays during gameplay, I was wondering which inf would I need to edit?

[@OctavioPlata]

x2

[@mclarenf1gtr99]

Is it possible to customize events/championship with such tools? (Change track order, lap, timer, grid selection, prize car, entry requirements, etc)

[@logane1102]

Yes

[@kmsthanks]

Is there a downside to playing on the online beta disc? is it missing content that the retail versions have?

[@logane1102]

it is missing FMVs and license demos, other than that it's exactly the same as retail,. but what does make a difference is the filesize of the ISO, opb disc is only 2.5gb which heavily reduces the storage taken up on your drive when trying to mod it, and it avoids having to go through the process of creating a dual layer dvd iso

[@strictlynineties]

@@logane1102 I just download and the public beta says it's 1GB in size, not 2.5GB. idk maybe it's not the right link anymore.

[@jatho7544]

Wow, can you actually model and inject entire car models with this?

[@logane1102]

not with the specdb editor. but theoretically IF a tool ever comes out that does that, then yeah. Some hackery can be done to swap already-existing ps2 gt car models and stuff like that, but as far as doing something like ripping car models from another game and then converting it to gt4 that's basically a pipe dream at this point

[@jatho7544]

@@logane1102 Cool, so maybe cut content like the Diablo GT can be restored at least, as well as restoring some unused exhaust sounds from GT3.

[@ArbitraryOutcome]

​@@jatho7544 Or the Evolution 7 Rally Car + Prototype from GT3 & Concept.

[@HEISENVER6A]

@@logane1102 It's possible to extract models? i want to extract the Ford gt that appears in the intro for assetto

[@stp_79]

What's the name of music in 0:00? It's quite catchy to hear

[@charlesanderson1321]

I'm not sure but i think it's either 5 prologue, 5, or 6

[@logane1102]

gt5 ost

[@dennispnut]

KEMMEI - Liberty it's from GT5

[@stp_79]

@@dennispnut thank you 👍

[@jordonpollock1550]

Possible to edit the online ISO garage to empty and revert starting credits to 10k?

[@hppvitor]

Yes, and it's something all GT4 hacks being worked at that I know of are doing.

[@jordonpollock1550]

@@hppvitor I did it manually via GT4 save editor, was way easier than I expected.

[@jimmy107r8]

online?

[@goldengemgames2939]

Um, I can't do step 2. When I enter in the command, I get this error in command prompt: Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object. at GT4FS.Core.BTree.BuildPath(Entry nodeEntry) in C:\Users enkai\source epos\GT4FS\GT4FS.Core\BTree.cs:line 201 at GT4FS.Core.BTree.BuildPath(Entry nodeEntry) in C:\Users enkai\source epos\GT4FS\GT4FS.Core\BTree.cs:line 201 at GT4FS.Core.BTree.GetAllFiles() in C:\Users enkai\source epos\GT4FS\GT4FS.Core\BTree.cs:line 192 at GT4FS.Core.BTree.ExtractAllFiles(String outputPath, String volName, Boolean overwrite) in C:\Users enkai\source epos\GT4FS\GT4FS.Core\BTree.cs:line 51 at GT4FS.Tester.Program.RunExtract(ExtractOptions options) in C:\Users enkai\source epos\GT4FS\GT4FS.Tester\Program.cs:line 169 at CommandLine.ParserResultExtensions.WithParsed[T](ParserResult`1 result, Action`1 action) at GT4FS.Tester.Program.Main(String[] args) in C:\Users enkai\source epos\GT4FS\GT4FS.Tester\Program.cs:line 101