Here's a Race setup for FGT/Suzuka in case some one wants to give it a try.
If you find it not stable enough than you can try:
Diff: a) Decrease coast side ramp to around 45.
b) If that's not enough - increase preload to 2000-2500.
Decrease rear ARB to 3or 4.
If you feel instability in faster corners increase rear wing to 4 or 5.
If you feel it too understeery than:
If too understeery on entry:
a) Increase cost side angle to 70-85
b) Increase rear ARB but this might lead to snap oversteer on exit.
If too tite in mid corner - reduce preoload (but this is a bit dangerous till that famous "slow speed terminal spin" is fixed by iRacing)
If you need a bit more rotation exiting the corner than decrease power side ramp angle to 35-30 but this may lead to rears overheating so this one should be reserved those with "light right foot".
Thanks
Ted
PS: Can't find how to attach file so here's a link:
http://members.iracing.com/jforum/posts/list/25/1809383.page#3749831