And before people go "but GT6 is is not client-server, it's peer-to-peer", GT6 is p2p but where the host acts as server and master clock. To test it, just compare the times you get when you're feeling low grip as a guest, with the times you get if you host the room.
I would have to agree with some parts of your statement, however disagree with other aspects.
As I have been host and guest countless times myself, in no way have i seen any differing effect in grip level or lap times based on being one or the other. I do agree that if someone else is experiencing latency/lag issues on their connection, you/everyone may see this interpreted as them braking very late into a corner, powering out of a corner at unbelievable speeds or just simply teleporting from one spot to another on track along the X Y and sometimes Z axis (Z axis teleporting is hilarious).
As for client server and peer to peer, GT6 has both these options available. The fixed room ownership is the star based networking system where as Unfixed is the mesh system (p2p) From my own back ground of networking and dealings with many many hours of GT6 online racing (and other online racing games on PC), your own PS3 powers the track, grip level and capacity of your own car based on set formulas based down from room settings and timed values of this (weather etc)
If your own lag was to play a part in lap times, you would notice this by your own car teleporting, stuttering and generally glitching around the track as you drive which I have never seen occur personally. The way I understand the system working in a mesh format, is that the information passed from one player to another is the cars values to determine current position on track, this changes obviously based on the race quality setting you have selected. The higher the settings the higher the rate of this information being sent to others (which would would make a lower connection player experience more visible issues with the other racers but not themselves) Even with the star network it is similar, however the "client" would send car position info etc to the host, which would then pass this information on to the other "clients". This is why they state the host in a fixed room should have high speed bandwidth, and also why when you choose this option, it automatically selects a lower race quality to maximize compatibility as the host is processing the bulk of the cars positions to everyone.
On one hand, your lag to the server is effectively causing you to feel less grip while braking, cornering and accelerating.
As mentioned above, I don't believe this to be entirely accurate. Your own console is controlling these values independently, the only information being passed from player to player is the car's position on track and a few other things related to track object positioning. If you refer to the manual about race quality "This setting governs the frequency with which driving information is sent and received over the network when racing online."
However, I'm not sure how comparing/quoting issues from GT5 helps in this circumstance, as the net code would of evolved for GT6 albeit may use a rough base coding on which it's derived from, but I do see the advice you are trying to give. If you have any relevant links in relation to the issues you state being relevant to the GT6 net code I'd be more than happy to read them to review any information I may have interpreted incorrectly.
Dexatron, If you want to supply me with the car and tire type you have been racing with, and the track in question (also room settings to match) I am more than happy to give it a run and compare times with you and share/data log information for comparison.
You would be surprised how much brake balance settings can affect the car. Are you running too much brake power (10/10) and diminishing braking effectiveness? Are you running too little (1/1) and not getting enough braking power? have you staggered it too much on the front (eg: 10/1) and experiencing inefficient braking? I don't do many "locked tune" races apart from occasional rentals so I don't know if they allow brake upgrade to racing to be done (have heard this can be done?) correct me if I'm wrong.
This reply was written over the course of a few hours so apologies for any double ups of statements.
Cheers
Funz
