Ske
Brake balance does nothing at all since all cars have ABS.
Suspension does just about nothing at all to under/oversteer.
LSD does SOMETHING, but it seems pretty random.
WHAT!!!!
thats silly
why include the parts in the game if they do nothing......
no no no
k, i'm gonna start ranting a bit. I don't plan to repeat what DTC has said with regard to the suspension. She's right onthe money with the weight transfer. I'm just adding a bit more to supplement her comments.
ok, brakes
the abs thing i can sorta fall in line with. But brake balance does make a difference to a car's handling. Take any car (I know MR's do this for sure), put on N1 tires on and set the front balance to 1, rear to something real high - lets go 24 just to get the full effect.
Now pick up some speed and brake at full. You should hear the rear tires sorta.... chittering is the only word i can use to describe it. If you try turning like this the rear should come around quite easy as they are being stressed to their maximum while the front is hardly being utilized. The rear's don't fully lock up when I've done it, which supports your ABS idea, but they break adhesion rapidly when any lateral weight transfer is applied.
I don't go to this extreme when I tune. I noticed it when i was playing around with settings on an MR LMP car. When I'm tuning for drift (if i use a brake balancer at all) i will only adjust the brake balance subtley just to get the sort of response i want at turn in.
suspension settings....
your way off the ball here, I feel. Suspension plays a massively huge role in determining under/oversteer. Its all I use on many cars I drift.
Be sure that all the aids are turned off first of all. Then take anything, even an FF, and set the rear notably softer than the front (spring rates, dampers/shocks, stabilizers....everything). This will undoubtedly result in less understeer/more oversteer. No car i've tried yet has responded differently.
Furthermore, have you played at all with the toe settings? touching them will drastically effect the cars handling characteristics. Even -1 in the rear alters most cars attitudes greatly under braking and turn in and makes them step out much sooner.
Now granted, this phenomenon of having to soften the rear to induce oversteer does not make much sense as applied to real life, so I see where any confusion may stem from in this regard. But to say all the suspension settings do not affect performance is nothing short of a ludicrous statement and to me it indicates either a lack of experimentation or a total lack of feel.
LSD...
again, way off the ball, I feel. It's the last step in determining how power gets to the ground and can change a car's whole attitude and how they respond to driver inputs. Now, in many cases for me installing one has had a negative impact on the car's 'driftability'. I've found some AWD's do better on the stock or a 2way lsd (possibly b/c I'm just brutal at tuning the front lsd settings). And many of my FR's are on a stock one as well.
In any case, they do have tremendous impact on handling characteristics. Try cranking the initial torque setting and compare how easily you break the rears free with power over - as contrasted to a very low initial torque setting. Then, set the lsd accel and decel low and note how much easier the car will rotate and change direction.
A fully customizable lsd is not a part which I use often in GT4, but I refuse to dismiss it and say that it has no bearing on how a car behaves. It likely effects high power cars moreso than lower powered cars (for the ability to change the torque settings) - and since I rarely drift anything over 320-330hp, I simply may not have the need for it in my settings.
you just need to experiment more and take closer observations.