Originally Posted by Ziggythewiz
Sounds quite unsafe, I mean, lots of fun! After driver, battery, motor, controller, tires, what does that leave, 50 lbs for the frame, brakes, etc?
This is what the an experinced Kart racer and owner of a Kart shop said when I asked him about the 500lb kart:
Adult karts are designed to run at about 375 lb. with driver. There are classes which require the kart to run at 405 lb and already it becomes a noticeable problem to get the kart to turn like it's designed to. When you get to 420 lb+ it starts to become a lost cause. Without getting too much in to the physics, the springs involved just aren't designed to work in the weight range, it's like an adult jumping on a children's bed. Unfortunately even race karts will understeer terminally when driven too slow or have cold tires, so if you're planning on driving in parking lots, etc, the problem will be even worse.
There is an old saying in racing, "power is nothing without control." I have a friend who bought a 40 HP shifter kart, he doesn't drive very well and the kart isn't set up very well, so at a given track I can do a faster lap time in 13 HP four-cycle kart. Unless you are drag-racing, you may be better trading off some of that power for Weight Reduction, this will make a better driving experience.
One more piece of food for thought, there is another old saying in racing: Horsepower sells motor cars, but torque wins motor races...
With that out there I DO want to be able to turn and make it around the track, I dont want a pure drag racing kart. So the new goal is <400lbs, here is my proposed weights as weighed by bathroom scale:
Rims and Tires: 17.5lbs
Driver after -10lb diet) 180lbs
Side pods( batt mount) 5lbs
TOTAL non-electrical 282.5lbs
Weight allotment electrical 117.5 lbs
So here is the challenging part.
Proposed electrical allotment breakdown:
Batteries: 84 Haiyin Ultra Proforrmance 6ah 3.7v nom-- 103v Nom 18ah
This should give good current even at voltage drop to 3v
3v*28cells*18ah*33.33C = 50kw
( could have complete packs that could be changed at pit stop)
Battery pack wieght with pack construction materials 40lbs
Weight left for motor controller and wiring 77lbs
Solution Jr(maybe) 12lbs
wiring and Rev. cont 5.5lbs
So all I need is a magic 50lb 50kw motor. haha
This leaves 50lbs for a mean motor...Hmmmm? any Suggestions?
I put a request in with these guys anyone heard of them? http://www.plumquick.com