I have a couple of examples of cars, though not terrible at handling, as I have worked them quite a bit, they still have some tendencies I could do with advice on how to resolve (if possible).
First 1 is the 911GT3'09. I find this car very easy to lock up its wheels or to lose its back end while braking. In fact pretty much any braking over 50% will cause the car to lose grip. It may just be that the car is over powered for the Sport Medium tires but I'm hoping we can tame the behavior. Overall I feel this car has very little mechanical grip.
These are the settings I got to.
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This is the tune of the car. The LSD is modified from the recommendations. I basically had to double the braking sensitivity to make the car not crash out every time i touched the brake.
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Next up is the NSX Concept GT'16. This car had some what unpredictable handing under braking. In some ways it is predictable but it makes for a nervous drive. If you brake (25% for instance) while turning in, the car will bite violently and want to oversteer. If you brake a a moment early, and then turn in, it will understeer and not grip at all. The point between understeer and oversteer is very narrow but usually I can find the right amount, but it can be quite dangerous. In addition I have to run TCS2 with this build otherwise is can easily power spin out. The LSD is not doing its job on balancing the power to tractive force. I would like to get this where TSC1 is all that is needed for RM tires.
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This is the tune of the car.
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Other things I tend to notice is that the cars tend to feel very "floaty". For example, I found +2 ARB for the 911 was much better. This may just be me being used to GR4 and GR3 cars more but overall I feel the app tunes on the "soft" side.
Advise welcome!