What modified E Scooters/Motorcycles go over 30mph?
Members want to know what modified E Scooters/Motorcycles go over 30mph and how was it done?
I have a modified EVT-4000. Stock it goes 30 miles/hr.
The modification was to be able to switch in another 12v battery and bypass the controller. This makes for 60 volts hooked directly to the motor, and the effect is kind of like an overdrive gear (or passing gear) on a car. I use it when I need momentary bursts of extra speed.
The method ... there's an 18 volt 12 ah battery stuffed into an area behind the seat where there's enough room to hold the battery.
There's a switch mounted next to the throttle that's in a perfect location for the right thumb to hit. The EVT4000 control panel has a perfect spot to mount the switch, and that's right where it is.
The switch controls some relays and a solenoid. The relays are set up so the switch operates the solenoid only when the scooter is under power. Todd (electricmotorsport.com) wanted, for safety, for it to kick in only when you're above 20 miles/hr. Otherwise the scooter acceleration is too high.
- David Herron, http://davidherron.com/
I also have an EVT 4000e modified to go 35MPH+ (as measured with GPS, not EVT speedo). I got a simple wiring harness from Todd at Electric Motorsport that wires in a fifth battery in series (charged separately). I chose to use a BB EB50-12 to match the rest of my pack, although you could use a smaller battery. The way the stock North American EVT controller is set up, the voltage to the motor is limited to about 80% of pack voltage. The extra battery brings up the controller output voltage to just above 48, so it's still within spec for the EVT hub motor.
This is a different approach from Reikiman's "Turbo button" setup, since this "60 volt mod" is on all the time. IIRC, Todd told me that the Turbo button bypasses the controller and sends the full pack voltage to the motor, hence the requirement to be traveling at speed before applying the boost button.
Silver EVT 4000e (60 volt) San Mateo, CA
De-restricted + 60 volts ~40mph
De-restricted + 60 volts + larger tires ~45mph
2006 E-Max sport @ 60v
I own the second e-max (actually two scooters - "his and hers") mentioned by Keith. My e-max was de-restricted for more amperage (max amperage raised to 95 amps) plus a switchable 60 volt boost which can be used for more speed or extending the range.
My scooter is used at least 12 miles daily since early May with with no problems.
Details of the 60 volt modification are in the thread in this forum entitled "E-max accelerating over 60 mph" and of course in Keith's blog.
Discussion of the amperage mod is discussed in "More e-max Controller Mods - Shunt Resistor Trick" - also in this topic. There is lots of extraneous discussion in this one, so scroll down to near the end to find out what worked.
No! The e-max motor is also brushless.
As a reply to your other post about upgrading your controller, you need to know the maximum voltage ratings of the controller components. As a case-study for what you might be able to do with your controller, I will describe the e-max controller below:
The e-max MOSFETs (IRFP2907's) have a maximum junction breakdown voltage of 75 volts, so that can't be exceeded. They are good for a 60 volt upgrade, but not a 72 volt upgrade as this would mean about 80 volts for freshly-charged batteries - no good. They also have a maximum continuous amperage of 90 amps, and the e-max controller uses pairs of MOSFETS in parallel for the plus and minus polarity switches of each phase (a total of twelve). This means a maximum continuous amperage of 180 amps. Other factors, like the effectiveness of the heat sink, and climate, control maximum continuous amperage. I applied a safety factor of about 2 and decided that 90-100 amps would be safe for the e-max controller when I did my amperage upgrade.
Other components that need an adequate voltage rating are the filter capacitors. The e-max capacitors were 62 volt - so they needed to be replaced with 100 volt ones - I refer you to Keith's blog for what had to be done there.
You also have to consider whether the controller's voltage regulator that furnishes the 5 or so volts to the logic chip circuits can handle the higher voltage. Keith thought they did and has had no problems, I wanted to play safe, so I wired mine so my controllers logic power is still 48 volts - this also preserves the functionality of the low-battery cutoff and the stock battery state-of charge gauge.
Finally, you have to consider if the scooters 48-12 volt DC-DC converter for the lighting and accessories will handle the increase in voltage. Keith's experience is that it does; but, once again, I played it safe, so my accessory wiring is tapped at the 48-volt point of the battery pack, like the controller logic power.
So, you will need to go through a similar process with your controller. I Hope this helps.