You don't need 1/8th electrics... just a high enough ampage speedo to handle decent current draw and a 550 size motor...
quality 1/10th speedos will run a 550 motor fine (depending on its rating)
Most of the 1/8th set ups are designed to run on 14.8V, if you try and run them on 7.4V they are a lot slower than the same 1/8th type motor on a 1/10th speedo with same voltage.
For the shootout i'm running a 4.5T Novak Havoc 550 using my Fusion comp speedo, seems quick enough indoors, pulls very well and top end is as fast as running a 6.5T 540 size motor... plus its a bit easier on the LiPO runtimes!
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