If I remember correctly, the Carrera cars have the highest voltage - something like 16V for the 1/43 cars. But, I can tell you this, I run SCX and Carrera 1/43 cars on my 1/32 Scalextric track using the stock power pack - it puts out 19V to the track and none of my cars have had issues. I know that many have said you probably want it lower - 12V to 14V is probably ideal for the cars as when they get up to the full 19V or even 16V they are bit uncontrollable.
Hope that helps!
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