Chris you shouldn't have a problem with this. when I first started out the model car party business I had 3 losi mini 8's and i modified the transmitters so that I could limit the end points.
The cars didn't suffer cogging at all and were only doing 5-6 mph. Just make sure you put the smallest pinion on that you can. These were all running the standard kit apart from my national race car that had an ez run 60a esc in it.
I was running the car on 2s lipos.
I now use losi micro rally cars and a mini z track but with the controllers limited. again no cogging issues.
If you want to make the speed adjustable on your TX it's not too difficult. Just need a twin pot variable resistor and some servo wire!
Thanks
Ben.
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