Throwing another idea out in the dust, or rather, continuing one.
I've been looking at the s2000's closely. You basically have 3 real design set ups over the years the model is in the dealerships.
Powerful/heavier, medium/medium, and less powerful/lighter.
And even though the base's are different, they are still very close to each other. The difference's they have make a real cool option for tuners to decide from I believe, as long as you don't set the pp limit too low.
In the tests I did, it seems around 470-480pp gives enough room to add parts/play with weight, but at the same time, not enough room to add every part and weight, ect.
With the cars being so different, but at the same time, so close to each other, I think it's a real great idea to think about, as the individual tune will make so much of a huge difference in lap times. But at the same time, like with this last Shootout, everyone would still be within the same 4 seconds of time.
Another idea, on the same method as above, I was looking at the roadsters, and miata's. Same as above, as long as your PP limit is perfect, you will have a good test of tuning abilities.
Yet another idea, LOL, and I really like this one, goes off of an old seasonal race from GT5;
The Japanese cars between 1990-1999 seasonal event. Really great range of cars to choose from, but at the same time, not going to break the bank of testers^^.
We would have to really look at the cars close to see if there are any so overpowered to be considered 'super class', but I advise just banning those that qualify if there are any, and keeping to only one group. A simple max PP of like 480pp would curb a lot of juice from some of them, and at the same time, allow for lesser powered ones to reach an ability to compete with the naturally higher ones with added parts.
The same can be done with 80's JP cars, and would be fun, but I like the look of the 90's cars more, lol.
As you can see, I've been researching the possibility's a lot.
Don't have enough yet, lol?
How about drivetrain 4wd only, on a snow track, and adding 'normal car only' to the rules, baring the Rally cars from playing. Keeping the PP low still, like 480pp, to bar the overpowered Nissan 4wd monsters from blowing everyone away. Initiating another 95% limiter limit to seal that condition.
What do you guys think about those ideas?