I use a standard Parma controller with a 45 ohm resistor for all of my cars, and I'm competitive in most races I enter, even against those folks who need hundreds of dollars worth of electronics on their pumped-up controllers.
45 and 75
I use a 45 ohm Econo for almost everything, tjets to polymer SG+, but will break out the stock Tyco/Tomy 75 ohm controller when the tjet track has a lot of alternating or tight curves and a relatively short straight because they're more forgiving of spastic trigger movements.
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