Are they tuning prohibited races?
If so, inclines are always an issue with that.
Luckily there are flat tracks like Tsukuba & TGTT.
Cote Dazur has that uphill that's kind of an exertion for the Fiat 500. Found that out when jackargent & I used them from the rec garage there & were struggling up the hill. However, aceboy127 & I managed to get it up Mount Hop Top incline...
https://www.gtplanet.net/forum/showthread.php?p=7596368#post7596368
I have a twisty little Tokyo Bay kart track that's pretty cool with the really low power cars. We've used it in VCRC races for the Z Act, the Subaru 360, and some others.
Toyko Bay is always flat, and narrow, so it's good for small super low power cars. In fact, I think they're more fun there than karts. (I rather do karts on Rome, frankly.)
You can also design some Eifel Kart tracks that are good w/ low power cars... provided they're not too steep with inclines.
Tsukuba is an excellent track for lower power cars because it's also completely flat. Tsukuba is great for most cars really.
I know of 2 Toscana Tarmac custom tracks that are really good w/ low power cars. One is by cc570 called Lagunitas Kei, and another was made by chuyler1 called Lemons Country Circuit. But I think even those, which do not have much elevation changes... I felt were a bit too much for an unmodified Fiat 500, and certainly for the Z Act or 360. Those cars, unmodified, can be a drag on any sort of incline, even slight ones.
Anyway, in looking at this line up of cars... I really want to highly recommend 2 other cars you may be delighted to race...
Toyota Sports 800
&
Honda S800
These 2 cars are in my top 5 favourite cars in the game!!! They are a blast to drive!

We've had several event races with these cars, unmodified, and we all had a lot of fun with them, over the past couple years.
The Honda is great on any number of twisty tracks and can sustain on an incline pretty well actually, and I highly recommend the Toyota Sports 800 on Eifel Kart tracks, where the inclines are never too steep for it.
