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Hi jhat

Please give more information about your set up. As a starter .........analogue or digital cars? What brand? What scoring system? If it's only a couple of cars that cause the problem, and other cars don't what's different about the cars?

That would help narrow down what the problem might be.
 

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Cars for digital systems normally have and need better EMI suppression than is necessary for analogue.

Lots analogue clubs have computer race control systems which run trouble free even using cars with no suppression at all.

All of the 1/32nd scale motors that I have taken apart at least have a ferrite disc attached to the commutator, even if they have no external RFI filters.
Agreed many motor do have those discs, they are particularly common on home set motors. However, there are plenty of slot car motors used in (analogue) 1/32 and other scales that don't have these discs, this is absolutely no problem with the computer race control systems used at many clubs.
 
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