an untimed (or speedo in blinky) will give a good smooth power band, a speedo with timing such as dualskys new product from SMD, will allow the speedo to advance the motor timing and the motor spins up, so you start with your 7.5 accelerating normal then after a pre set time delay by the user the speedo will up the timing making the motor spin up faster than "blinky" so you can have a smooth low end and a fast reving top end, this is what many of the top drivers are now doing.
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MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD
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