Drag Mini scooter - Going for Razor Pocket Mod record. (if there is such a thing).

[forcefed86]

Goal is to get a 7 sec 1/8th mile and sub 4 second 0-60 times. 40-50kw or so should do it. Total weight assembled is 123lbs. I'm 220 and 6'4.

Best time to date on Draggy is a 4.2 0-60 and 8.1 @ 79mph in the 1/8th. 5.3x 330' time.

That was on 111v SOC and 375a. Plan to turn it up to 450a and fully charge to 117v and make some changes once the weather is nicer.


Started with FB market place purchase of $100 on this new in box 24V Hyper Mini scooter.



Purchased $80 shipped steel 490mm swing arm off Aliexpress.
10" QS212 5k motor and a ND96850 Fardriver controller.



Stripped motor electronics and rear wheel. Frame weighs in at 24lbs.


Split the swing arm down the middle so it was wide enough for the motor. 208mm dropout width. Mounted the wheel and welded the center back up.



Mocked it up and welded swingarm solid to the frame. Adding bracing as necessary.



Mounted and wired in controller, throttle, boost button, regen, and routed brake lines. Test Fit battery pack. 28S 15AH LIPO.



Slapped it all abck together.

 

[TheFlipSide]

Awesome! I actually picked one of these up on CL for free last fall. You are speaking in languages I don’t quite understand like your controller and any reference to a metric phenomenon the whole world except the US uses. But the fabrication and speed I completely understand.

I am assuming you beefed up the frame also. I basically just overvolted mine to see how it handled at a relative speed (about 25mph) and the frame feels soggy, I am about 225lbs. I like the idea of stretching it to maintain front wheel ground contact, but I also thought it would be hilarious to cruise around with it looking stock and then take off like a rocket!

 

[forcefed86]

Thanks. Didn't really do anything to the frame aside from the one vertical support bar tied in to the swing arm for added support. They are suprisingly stout and well made. Built several now. Unfortunatly no way around the "metric talk" as almost all decent affordable motors are made overseas. Basically just cut the swing arm in half and make it fit.

Most of the unsteadyness at speed is based on the tiny wheels and short wheel base. Also the lack of any real rake angle to the front fork. Stretch her out and put some bigger wheels on and it gets really stabil. I had no idea I was going over 80mph with mine. Felt nice and smooth. Nothing like a stock wheel and wheel base pocket mod. They feel sketchy at 30-40mph+.

If you just want "wow factor" The stock wheel base is fun with a simple 1020 style 72v 3kw setup on 75-100a. Very cheap to build and was a total wheelie monster. Done a few of those now. The pink barbie bike I built was especially fun to beat up on the gas bikes with. But you can't really apply more than 10-15kw or so on the stock wheelbase without it wanting to wheelie... even at 20-30mph. The MX500 sx500 amd mx650 dirtbike frames are much bigger and more user friendly for a big guy. MegaMoto minibike is even bigger and better IMO.


Few other bigger mini's I built.

 

[forcefed86]

Got it a little quicker this weekend with some homemade traction compound. Still think I can get it down to the 1.80 range or better with tuning. Then will take it all the way out to the 1/8th again on a full charge.

Pretty promising first half though. 3.7 0-60 and 5.0 flat at the 330' mark is def. a 7 second pass.