Funnily enough I did some work around this a month or two back that I didn't post. At the point at which PD made the car, Renaultsport had just started building the first few racecars, and shown a concept version of a road car. A lot of its data is basically guesswork and placeholders like the other concept cars, and the 5-speed transmission is copied from a Civic Si. I might end up 'backporting' the transmission from the production car that came out around the time of GT3, but PD making stuff up is about as accurate as it gets for the concept car in 1999.
The 5-speed is also one limiting factor for the car's performance in Arcade mode - it's infamously far off the pace of the Venturis and so forth in class S. An idea I had to fix this was to upgrade the Arcade car to the spec of the 1999 racecars:
It gets another 35hp, is 150kg lighter, has a 6-speed racing transmission with longer gearing, as well as Medium racing tyres and a little touch of downforce. It's still the worst-accelerating car in the class, but now has a bit more top speed and sticks like glue in the corners. Winning races in it remains more of a challenge than some other cars, but the AI now keeps up with the rest of the class and it's quite a bit faster.
Part of why I didn't post it at the time was that I'm unsure on whether to keep this change or just to replace the Clio entirely in Class S with something that doesn't need a gimmick tune to be worth driving.
Since doing the above needed me to finally figure out editing Arcade mode properly, I also took the chance to fix the Arcade Venturi 400 not having turbo sounds and a boost gauge, so it matches the fix in GT mode.
One other fix that I forgot to post was revising the R30 Skyline Silhouette - now that it's a museum piece data is a lot more available than it was in 1999, so I had the chance to update some things. Most notable was correcting the wheel and tyre sizes, something that once seen is very obvious:
I also updated the car's stats - it was slightly lighter than Nissan now claim, had the dimensions of a stock R30, and a few other minor details. It still makes too much power down low, but short of porting engine data from a newer game with the car in there's not much I'm planning to do about that.