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Stotty Turn 1 commentary...........
It's more about throttle off oversteer than brake release oversteer, feed a bit of throttle in and the car is OK with the release of the brake. Also, the Decel LSD is a big factor here, along with rear toe, camber, ARB and spring rate. If you don't have it dialed in just right, it's scary.
It's not throttle release oversteer (AKA lift off oversteer)... trail braking in to turn 1 the car wants to understeer if you use too much brake, but easing off the brakes causes oversteer... this is not realistic behaviour! This car should oversteer on the brakes whilst turning (as long as the brake pressure isn't too high) as the weight shifts forward and unloads the heavier rear. When the brake is released, and weight shifts rewards, this should result in understeer.
This particular 'feature' of the GT5 physics engine has always irritated me; it's the key reason I think GT5 was a backwards step and GT5P's physics were much more realistic - along with GT5P having a more clearly defined grip limit rather than the permanent 'always sliding to some extent' feeling of GT5.
I am using some 'throttle drag' to manage the reverse (incorrect) weight transfer, but this tends to make the front wash out as well.
Anyhow, I've now adopted a different approach to Turn 1, braking a bit earlier and taking a straighter line in to the 1st apex. Doesn't feel right, but results in less aborted laps and I did hit a new T1 PB of 48.118 last night (with more to come).
I can't stop trail braking to some extent though as it's habitual, so I'm having to use a 5,5 BB and a bit of LSD decel (which I've never used on any car other than the Yellowbird previously).
Doodle's tune has a good balance, but for the less skilled (and pad users) I'd recommend...
Lower LSD accel (15-20)
Even or front biased BB (5,5 or 6,5)
Add a bit of LSD decel (c.10-12)
You can also make the rear toe less -ve if you're really struggling, but I'd avoid this if you can and it will make the car understeer even more than it already does mid corner.
ps; my Gyte 'progressive brake spring' arrived this morning, so I'm looking forward to fitting this at some stage in the near future and seeing how it affects braking