Making e-Bike Faster?

[thatdifferentguy]

Hi, I got my first electric mountain bike about a week ago, and I'm addicted already. The problem is I would love it to go faster. I noticed when running the bike with the back wheel up. It only goes up to a certain RPM, I was wondering and I'm guessing its electronically limited. Is there anyway to bypass this safely? Would adding a higher RPM motor to the front wheel help get the bike to high speeds? I got 2 batteries for the same bike.

Both batteries are 24 Volt 15 AMP Circuit (2 Batteries at 12 AMP's each) Sealed lead acid batteries. It has a 300 watt rear hub motor also 24 v, the battery goes behind the seat so theres lots of free room to add battery packs or additional controllers and wires. The controller came factory made with the bike. an X-treme XB-300 SLA assuming it can only handle what it was built for.

It goes only upto 20 mph so I would love some ideas for a higher speed solution to get it to 50 mph.


Bike IMG: http://i.ebayimg.com/00/s/NzY4WDEwMjQ=/z/HUEAAOxycmBSy84S/$_3.jpg

 

[Drunkskunk]

Welcome to the forum. If the motor's speed is the same when the back wheel is lifted as it is when you're riding it, then it's being limited and that may be correctable.
If the speeds aren't the same, then it's likely just how the bike is configured.

It would help us to know what Motor, controller, and type of battery you're running. It can also help to know what part of the world you're in. We're fairly international here.

 

[thatdifferentguy]

Thanks for welcoming me, the motor is a brushless 300w hub motor 24v. It's generic. Also the battery is two 12 AMP (15 AMP together) 12v (24 together). Also I live in Canada, and don't worry about any legal laws. i live in a small town and no one really cares.

 

[dogman dan]

Your main limitation is 24v. More volts is what makes a motor spin faster, barring any other limiting things such as controller programming.

The other limitation is $$. But you can get going quite fast for fairly cheap, see YES.com 1000w 48v kit. The real $$ is allways spent on battery first. A lightweight 72v pack can get pricy, but it can make a modified yes kit hit 40 mph.

Walk before you run, get a 48v motor with more power, and try 30 mph first. Fast as you want to go on some cheap bikes.

 

[thatdifferentguy]

Thanks for that, I have been looking for a kit, I do have two 24v 15 AMP battery packs which I could connect together. The kit does look like a great deal.

 

[Ugrd]

Once you reach anything above 40mph however you REALLY need to think about seriously upgrading parts, mainly motor/battery, controller, your wheels/rim (moped/motorcycle) and frame/suspension (DH/Mountain Bike). Getting to 35mph is a fairly easy task but getting to 50mph is a challenge if you try to make a 1000w hubbie go 50mph haha. 50mph normally requires 4kw sustained or more.

 

[USAEBIKECO]

If you wish to go faster I recommend going with a 48 volt battery for your bike. Make sure your controller box can handle the voltage.

Anything above 48 volts is just not safe in my opinion.

 

[MadRhino]

More volts to spin faster, and more watts to fight wind resistance. That is the simple solution to higher speed.
Once you can build a light weight bike running 100v 150A, you are unlikely to want any more speed and acceleration. Yet it is expansive to build a light weight bike, with reliable components capable of that kind of performance.

 

[wesnewell]

Welcome to ES****Do this before your first post or now (it's retroactive)*****
Please go to the User Control Panel, select Profile, and then enter your city, state/province, and country into the Location field (country minimum) and save it. Once done, your location will appear in every post so you won't have people asking where you are ever again. This will help people help you. Example: Wylie, TX, USA. or just USA, but country as a minimum, and country is the most important. There are many cities with the same name all over the world. Without knowing what country you are in it's hard to make any recommendations. Thank you.

Forget it. This is your bike.
http://x-tremescooters.com/electric_bicycles/xb300sla/xb300sla.html
It's just too weak to go much faster than it will now unless you just used the frame and replaced everything else. The little 300W motor just won't cut it. If you want something much faster than what you have, you'll have to start over.

 

[drew12345]

Exact same thing happened to me. I had currie bike and was hooked. I even bought a kit to series my two batteries together. My suggestion is to not mod the bike. You may burn out controller or motor going faster.

Buy another bike (preferably full suspension) and start building that up with faster kit. Enjoy riding this until you build that up and then sell it.