The idea's to race the LRF set along with extra cars tweaked to match, preferably easy ones to drive. This is generally a brainstorm thread to suggest/work out the best solutions, from what Tweak app to use, to any other helpful apps, to what the tweak car configurations should be. Anyone's welcome to suggest anything. There's no criteria other than squeezing the most cars out of LFSTweak to best match them with the LRF group. Overall this would add some novelty to the LRF class by addressing the reason for most players' reluctance to use LRF: how difficult they are to drive to their full potential.

Design of actual race events/league/etc can follow once the cars are ready.

First question is how many cars the current usable LFSTweak(s) allow? If only one, it might not be enough to attract interest. Two ought to be enough and three would definitely be enough.

Assuming the more variety, the better, this is what I'd suggest:

1) The LRF class almost completely requires advanced driving skills. So the new cars ought to be as easy as possible to extract speed from.
2) In LRF we've got an RR, an FR, and an MR. So the first obvious addition would be an AWD car. In all of LFS there's no V8 road car, so that's another one. The most different car that this leaves, that'd also be user-friendly as per 1) is a naturally aspirated MR, one that's as agile as the RAC but less dodgy. E.G. something like an F-430 tweaked to be as docile as possible.

So putting this all together I get:
The XFG as a rally kit car, e.g. 1600cc, strong turbo, AWD, and slicks on wider-tracked wheels so the car doesn't flip over so easily. I don't have the tweak file anymore, but this is what it looked like:

It basically was the most agile car, with correspondingly less top end. Later I managed to find tweak settings for LRF laptimes without the oversized wheels, but they definitely needed to be about that far out to deal with the extra grip and high COG.

One of the two XRs basically as a Corvette/M3 FR roadster. Main design cues are very easy V8 throttle-ability and simplest possible handling character. Weight/tire size adjusted to keep it competitive.

The other XR as F-430. I'd copied the real F-430's specs to Tweak, and Flotch made a base setup for it. It was pretty easy to handle. The only difficulty was learning the feel of MR weight distribution, but it was very easy to control without the skinny RAC tires and larger NA engine.
I'm pretty sure I still have that setup by Flotch, so narrowing it down to only tweaking the car's max potential performance thru tweak to fit it inside LRF performance area should make it pretty easy to finish this one.

That XF doesn't work with road_super tyres? It just feels weird to me to have a car with racing tyres against cars with normal tyres.

Seeing we already have the RB4 as an AWD car, why not use it? Just get rid of the inline-4 for a V6 or something (if that's doable).

And why not use the FXO as an "M3" instead of the smaller XR?

I personally think the STD cars look too tiny compared to LRFs. TBOs should look better. But nothing against having a smaller rally kit car in there, variety is great. I just wouldn't drive it.