Savox servos (especially the 1/10 scale sized ones) are famous for being thirsty on current. Sure, they are good value and have good specs, but they seem to achieve these specs by throwing current at the situation...
Futaba versions are more current friendly, but less friendly on the wallet.
Most speedos with inbuilt voltage boosting circuitry put out between 2A and 3A to the servo and receiver. However, some speedos are not always able to maintain a steady voltage to the receiver and servo if you push the currents close to their limits.
So, if you have the "wrong" combination of speedo with poor voltage/current output and a thirsty servo you will almost definitely get problems.
My suggestion is that a receiver pack might offer a better solution that a separate booster. Boosters only offer the same 2A to 3A as your speedo so adding one won't really get you any further. I'm guessing that a receiver pack can supply more? Just keep on top of charging it between racing and you should be ok.
Hope this helps,
James
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James Garrett - BRCA GT12 Rep
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