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Originally Posted by Bruno Carmo
Hello from Portugal. I own a FT B4 and I am very happy with the car. It seems very strong, easy to tune and very competitive.
I would take some doubts:
I like to have a quick steering, so would like to have a better servo. What is the servo counseling for this model? a fast servo?
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Look for a speed of around 0.10s/60deg or faster. Torque in a 2wd is not so critical. Try and buy a quality Japanese brand like Futaba, KO or Sanwa. These servos are a good investment and will last many years. Personally I run a Futaba S9451.
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Another thing is that I have seen many parts for the B4 in aluminum. What are the essential parts to find useful in aluminum?
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None. The FT kit has all the aluminium parts you need.
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In relation to the weight of the car, someone has some suggestions on where to put the weights for better performance of the car?
I have read some articles about that, but I prefer practical reviews on the subject. I personally chose to 10g in front of the car, 20g center in support of battery and 10g of each side along the edge of the chassis on the front.
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You will get a variety of answers on this. Personally I still run NiMH in the car(albeit maybe not for much longer
) and run no ballast at all. I tried some ballast and saw no improvement. Top UK drivers seem to run a lot of ballast all round the car, the new US setups are without ballast, running the car at minimum legal weight.
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Finally, I would like to know if anyone was a file guide to choose pinion, gears depending on the lipo and motor to use for the B4?
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Sorry, I have no experience with brushless in the B4 either. All I know is that 7.5 seems to be the hottest motor anyone runs now.
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thanks
ps: sorry for my bad english 
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Your English is very good!