I’ve done a few upgrades to my son’s 12v Mini Cooper, and he loves it.
When the shitty lead acid battery just stopped taking a charge one day, I threw in a 6s battery and top speed jumped from 5mph to 9-10mph. It was like an instant turbo upgrade and his mind was blown! Even with me barely fitting my 180lb. ass in it with one leg hanging out, it was able to do wheelies. Very torquey. However, the next time I took him out to drive it, I rushed to put two 6s batteries in to give him more range and accidentally wired them up in series, out of habit. Didn’t realize what I’d done until he took off like a rocket on meth, made it about 40 feet, then POP, POP, sparks from each wheel and…no more go time. Oops. Apparently 12s was too much. Time for new motors. I went and did some reading at http://forum.modifiedpowerwheels.com/ and found these little guys on eBay
These motors are a little hotter than the stock ones, so now I’m running them on 4s and my son is so happy. Still goes about 10mph, which is plenty…for now. Only problem is that the throttle is not variable, so it’s either on or off when you push the gas pedal, but it does have two speeds, so I’m teaching him how to take off in “1st” gear and shift to “2nd” gear after he gets going. Get him used to the basics of driving a stick.
I’d definitely be interested in upgrading to a couple FOCBOX’s, but I’m a little unclear on how to run them with DC motors and whether a regular 3 wire foot pedal throttle would work with them. I feel like trying to mate brushless motors to the gearboxes would be more trouble than it’s worth, since the upgraded DC motors have plenty of torque and speed and are basically plug and play. At this point, I just want to improve the throttle response and handling a bit.