Hmmm,
Voltage dip... used to suffer that many moons ago on certain RX speedo combos
But shouldn't be a problem with decent lipos - there supposed to have a very small voltage drop under load when compared to Nimh or Nicd. The other possibilty is that the BEC circuit in the speedo isn't as good as it should be.
Although i've run GTB in the 4WD, geared high, 6v high power digital servo, fans and PT all running off the RX and no problems. So i would say the BEC from Novak is definately upto the job.
The "smart stop" is a lipo cut off device? If your GTB is new it should have integrated Lipo mode???
You could try removing the smart stop for a test as long as you remember not to run the car too long.
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