Solved as of 1.11, there's no need to panic anymore IMPORTANT NOTE : this thread has been recreated following a suggestion from @Famine, as the original discussion drifted towards naming people, unproductive speculation and paranoïa. As such, it is asked you don't mention directly the name or PSN id of anyone you suspect of having the bug in this topic; instead, you should rather contact someone who was involved in the investigations privately so that can be reviewed by people knowing precisely what to look for - I think the best is that you send me a private message here or on PSN (GT-Alex74), so I can either have a look on it or forward it to a competent person. In the meantime, what you can do is send the link to this topic to the person (don't forget to refrain from any accusations, keep it as short and as polite as possible). Also, many thanks to @Tassie_tiger and @kilesa4568 for helping getting this to reach Polyphony Digital. EDIT : Polyphony Digital has contacted us directly, RA1784 has provided them the bugged save files, so everything is between good hands now. 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. All the data suggests this bug is binary (there is only a single level of bug) and is only increasing grip, not decreasing it. Please note this isn't a cheat triggered by players themselves, those who are infected by this don't even realize something is wrong with their game. - 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 a specific controller (DS4 or any wheel) * it is not related to the temporary files cache * it is not a tyre swap bug (even on super soft tyres there is still an advantage with the bug) * tyre deformation is still there * no tyre screech is heard on bugged laps * 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 or network issues * it works both online (lobbies and sport mode) and offline * it works 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 * it feels very close to how the boost feature ups the handling (details below) - 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 : And here are some useful posts that have been post in the original discussion : UPDATE : new tests brought up something interesting related to the boost feature. Read the quoted posts below, which can be found on page 2.