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By Waxmonkee
#31445
Hey guys!

I'm new to the hobby, but I picked up a razor e300 with dead batteries and possibly motor so I've decided to upgrade to go up to 30ish mph, last at least 5 miles, and go up hills. I'm hitting a few issues I could use some advice on.

I've already purchased 2 new batteries, Turnigy 3300mAh 5S 30C Lipo Pack w/XT-60, and I believe I will need a third one because 2 will produce 36.6v if my math is correct

I'd like to upgrade to an 1800w 48v brushless motor, and obviously I'd be getting the corresponding controller to go with it, but after research I believe I'm also going to need a new chain and rear sprocket as well, one that matches the teeth on the motor.

I have 3 questions, and I am not adept with engineering or anything electrical, so I appreciate your patience.

1: Batteries: I believe a 3rd battery will bring the voltage up to 54v, is there a better option to get the extra voltage or will a 3rd of the same solve the problem?

2. Motor: Is this even possible? I haven't seen anyone try this size motor on an e300 so I'm sure I will have to adjust baseboard in some way.

3. Chain and sprocket: What am I looking for here? Is there a number of teeth on the motor that I should look for, type of chain, type of sprocket, etc?

IS there a better way to achieve the results i want? Are there any other technical issues I've forgotten?

Any assistance at all would be greatly appreciated


#31453
Hi Waxmonkee!

Wow, where to start?
Waxmonkee wrote: I'm new to the hobby, but I picked up a razor e300 with dead batteries and possibly motor so I've decided to upgrade to go up to 30ish mph, last at least 5 miles, and go up hills.
LOL, a member on this forum once wrote something like, "speed, torque or distance, choose two"! I'll start with speed and go from there. The max speed that you will go is determined by your gear ratio, along with the RPM's of your motor. There is a gear ratio calculator here that you can use to determine your max speed:

http://www.csgnetwork.com/kartpotentialspeedcalc.html

However, doing 30ish on 8" tires is NOT safe! If you really want to do that kind of speed on an E300, ask robnewyork for advice. I'm sure he can recommend a good mortician! :lol: (Warning, robnewyork is the "crazy forum member", who, based on his posts, has really good insurance or no fear of horrible accidents and or death!).
Waxmonkee wrote:I've already purchased 2 new batteries, Turnigy 3300mAh 5S 30C Lipo Pack w/XT-60, and I believe I will need a third one because 2 will produce 36.6v if my math is correct
Lipo's are great for their compact size vs the amount of power that they can store. However, lipo's are dangerous! Do some Googling, then use extreme caution when handling lipo's. They CAN exploded if dropped for 1m or higher! They can also catch on fire if they are not charged or discharged properly!
Waxmonkee wrote:1: Batteries: I believe a 3rd battery will bring the voltage up to 54v, is there a better option to get the extra voltage or will a 3rd of the same solve the problem?

2. Motor: Is this even possible? I haven't seen anyone try this size motor on an e300 so I'm sure I will have to adjust baseboard in some way.

3. Chain and sprocket: What am I looking for here? Is there a number of teeth on the motor that I should look for, type of chain, type of sprocket, etc?

IS there a better way to achieve the results i want? Are there any other technical issues I've forgotten?

Any assistance at all would be greatly appreciated
Adding another battery will give you 48v, (or the 54v that you mentioned, please read the battery FAQ section). I going to assume that you have the stock 180w motor on the scooter? 1800w will fit, but you will have to mount it on the upper deck, (I still have scrape marks on my 1000w that I tried to mount on the underside of an E300 :roll: ). however, you might want to consider an permanent magnet motor, aka industrial motor, like a Leeson. These are around the same price as the 1800w but are rated at 12v/1800 rpm. They have an internal fan to cool the motor, so you can throw 48v at them with no problem. 1800 rpm x 48v = 7200 rpm. Going back to the gear ratio calculator, if we put in 12/55 gear ratio @ 7200 rpm, you get a speed around 37 mph.

However, (boy, I really seem to like that word!), running at full throttle on an e-scooter is the same as running ful throttle in a V8, it will suck down juice! I.E, shorter run time.

Really, what I would recommend would be do what is referred to as a "vanilla" mod. Go with the following:

800w 36v Unite motor:

http://www.ebay.com/itm/800W-36V-DC-28- ... Sw~bFWPm9c

Add a controller of you choice:

(I'm partial to this on due to it flexibility):

http://www.ebay.com/itm/112095854727?ss ... 1436.l2649

or this one:

http://www.ebay.com/itm/36v-800w-Motor- ... SwKtlZlB8w

55 tooth sprocket:

http://www.ebay.com/itm/Razor-E300-elec ... SwY0lXTck-

#25 Chain, (if you need extra):

http://www.ebay.com/itm/25-Chain-56-lin ... Swk-9ZgzxD

All of that, along with your existing lipo's should get you on the road. You can run the 36v motor @ 48v as long as your careful. To much heat will kill the motor!

Start here, test the results and then decided if you need/want more on the E300. My experiences are anything above 20 mph, E300's start to get a bit scary, (the small wheels are hard on any crack in the pavement).

I hope this helps!

zog
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