Re Slim-can motors:
The Scalextric slim cans turn about 24K, the MRRC/ Monogram/Revell motors turn about 20K. The aftermarket motors like Minnow are 18K but very low on torque. I found that the SLT-2 motors that we are using in the F-1 proxy are 18K but with more torque and are snappier than the minnow.
Another option to make these cars run well with the stock motors is to use a smaller pinion and larger Crown gear. But these are all mods to the cars, most of which I learned from Goose.
For our discussion here turning down the voltage a volt or two would probably be best, easiest, and cheapest.
These cars all look small, but the Chaparral has the same footprint as a slot it GT-40. I have one that is capable of running in the 6s on Al's track. Fun cars to play with, learn on and experiment with.
All that being said I have to also agree with Doc. The Carrera DTM is an affordable beast that is bullet proof, and all we need to do is sand the tires. It is also still in production and readily available. It just happens that The Goose wasn't a fan so MR Bill probably doesn't have two or three boxes of them. But who knows what is waiting in those unopened boxes?
As someone past 60 I prefer the look/style of the older cars, but if we are trying to entice newer (AKA Younger) racers the DTMs with all those graphic liveries may be more appealing to them.
Coffee cup is empty, see ya.