There were issues in the past with 1/8 IC buggies. Long finals and small but hot (heated from the engine) reveiver boxes caused the problems. I have never heard on any heat issues when used with electric powered cars.
I know many people that use the R603FS in their 1/8 buggies and it was a long time since I last heard of any problems: Perhaps they have made some changes to it, Futaba would not admit that anyways.
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The Tamiya Sheep
Various Tamiyas including TRF201 and TRF511
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