Racing always lends itself to going faster. If I was a betting man I'd buy the BJ4... as a matter of fact I'd buy two of them. You ask, why? I'd keep one as a club race car and one as an "event" race car. If you break at either one you'll have at least one spare. The B44 would work as well because it is the product of the BJ4.
Secondly, forget about brand loyalty. I'm gonna save you a lot of time and energy guessing on what to use in your car. Use the Sphere TC or Tekin ESC with the Orion, Tekin, or LRP brushless motor. If your driving skillz need work I would suggest something in the 7.5 to 10.5 range... this will give you a good balance of speed and torque.
Next, I would recommend the Futaba 4PK. Nothing else!!! They are the best plain and simple. Stick with a digital servo with 180-250 oz.in. such as the JR 9100S. Use the receiver that comes supplied with the radio, this allows you to use the digital servo in HRS mode. The JR 9100S has a .06 trasit time in HRS mode... none faster!
Finally, I would get the Trak-Power LiPo sadlles and a B44 LiPo brace or the one by diggitydesigns. The stock battery tray is for NiMh batterys. As far as the charger you would do fine with the Trak-Power charger. As far as balancing, you may want to consider buying the one for their charger. Personally I use the Triton2 because that was available at the time and it worked well with my Reedy batteries.
What does it all mean? Plan on spending $700-1,000 on the kits, another $500 on the radio, $150 on the servo, $300 on the motor/ESC, $400 on batteries, and $150 on the charger. So lets see, that is about $2,500 just for that and add about $500 for tires and incidentals. So about $3,000 in U.S. dollars has you covered if you are serious about racing.
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