This thread is there to gather all the informations forum members found on a bug which can potentially have a huge impact on the game in the same place and in an organized way, in a hope Polyphony Digital can use this to identify and solve this issue in the best possible conditions. I will ask you to refrain from posting rants about the game or devs as that won't help in any manner and I'd like this topic to remain as clean as possible to allow further discussion if needed. I myself didn't do much except watching and asking a few questions, credits goes to those who did the research and RA1784 for taking his time to do all the tests.
- What is this bug ?
Basically, it is a bug which seem to change the physics of the game, allowing people who benefit from this lap times around 3 seconds or more faster than what they would achieve in regular conditions. It allows to brake much later and accelerate sooner than normal, while giving superior stability, as if the car was on rails.
- How was it discovered ?
Courtesy of some fellow GT Planet members and regular top 10 scorers for years. These guys noticed new people putting up abnormally fast laps above regular world records, so they started watching closely the replays and noticed something was wrong. It was publicly called out by Spurgy on GT Planet (
link), and after some exchanges on the bug report thread, RA1784 invited people who showed interest in the investigation into a PSN chat (
part 1/
part 2/
part 3/
part 4) to clear things out. RA1784 was asked to perform various tests until we found where it came from.
- What we know :
* it is directly related with the game progress save file (deleting it and not loading it back removes the glitch)
* it is not related to the game settings save file (deleting it doesn't change anything)
* uninstalling and reinstalling GT Sport doesn't remove the glitch
* it is not related to console hardware
* it is not related to the temporary files cache
* it works even on the softest tyre compound
* it is not caused by a set of driving assists
* it is not linked with liveries (
including custom wheels) or gifted cars
* it is not caused by internet connexion speed
* it works both online (lobbies and sport mode) and offline with all cars
* it might be connected to another bug (driving preferences such as ABS, FFB and transmission always resetting, as well as the view) -
If you experience this bug, please contact me by sending a PM here.
* at least 4 different users were spotted driving with this glitch thanks to suspect lap times in the top 10 leaderboard replays, but there might be naturally slower drivers outside of top 10 infected with this bug as well
* it effects lap times by around 3 or 4 seconds per lap
* it is not connected to the debug menu glitch
- What we don't know :
* what triggers the bug
* what exactly it does to the physics
* if using a T100 wheel had any effect (most probably not but that wasn't thoroughly tested)
* if an update can corrupt a savefile
* how many people exactly are touched by this
As regular players, I think we did pretty much everything we could do with the tools we have access to and the much appreciated cooperation of RA1784. It is now in the hands of Sony and Polyphony Digital to identify precisely what's wrong in the saves, figure out the technical details and work to solve this issue.
@Spurgy 777 You may want to put your videos and other stuff directly in this thread, I'll edit this post to add them here if necessary.
@RA1784 If you could upload your save file backup there as well, that would be ideal (EDIT : we discussed this and thought it would be better to keep it offline until someone from PD asks for it to prevent any hacking possibility)
@MINKIHL @zzz_pt @Shottah072 @Rick23 GT @kubstar @nissman @Tidgney @Iceman If you have anything to add in there, don't be afraid to do so as well.
@Jordan if you have any way of contacting Kaz or someone at Polyphony Digital directly, the community would appreciate if you pointed them to this thread.
If I missed something or wrote something wrong in there, please correct me, but I think for now that's pretty much all what has been said and done.
EDIT : MINKIHL sent me the pictures comparing his braking points with RA1784's braking points in better quality than what you can see in the PSN chat screenshot, so here they are (and RW stands for soft tyres in German, they're not wet ones). From his own words : "Its the frame where we both hit first time full brake."
Also, here's a post from Spurgy with a few videos showing laps done with the bug :
