Upgrading the EVT 168 to a motorcycle

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gurkelur
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Joined: 07/25/2008
Points: 14

Dear community,

I'm riding an EVT 168. This is my first electrical vehicle and I'm indeed fascinated by the subject. So much potensial, all this technology waiting to unleash itself, etc. But the scooter is weak. It's puny and slow in traffic. I need something that can keep up with squash pufflers and hateful, mental cab drivers.

Time for an enhancement :)

What I'd really like, is to make this flashy peace of plastic and battery acid able to reach 85 km/h, and to have it legally registered as a motorcycle. As I have no mechanical experience on motor cycles at all, I hope some of you can answer these questions: Will the scooter be safe to ride? Will the brakes be effective enough? Will the frame take the speed? I reckon it will be good for 65 km/h, since this is the ungoverned speed. Making it legal requires testing by the government, which could be hard to pass. Should I just anabandon the project right away?

If you share some of my hope, here is what I thought (now, I know very little about this subject, all guiding will be apreciated):

The 3kw 72V EVT hub motor
or the 6kw 72V hub motor from Kelly
and some lasting and light lithium batteries. For example a123. Next summer, lithium batteries will be pretty affordable :)

Any comments, ideas or suggestions? Is the 6kw motor suitable? What amperage on the batteries?

Thanks a lot in advance!

Regards
gurkelur

EVT 168 specs

EVT 168 specs

EVT 168 specs

EVT 168 specs

EVT 168 specs

EVT 168 specs

EVT 168 specs

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reikiman
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Joined: 11/19/2006
Points: 8456
Re: Upgrading the EVT 168 to a motorcycle

85 km/h ...? That's 50+ miles/hr ... are you sure you want to do that on such a small vehicle frame? The fastest I've had my EVT4000 was 40 miles/hr and that was a bit exciting.

The 40 miles/hr was achieved via the turbo button on my bike which makes it switch to a 60v pack configuration from the normal 48v pack configuration.

It would follow that a 72v pack configuration and a beefier motor might get you the speed you want.

I think the frame is solid enough for this (that's my wild guess and it's your butt on the line so be careful) but the consideration is whether it's a good idea to go that fast with 10" wheels.

The EVT motor has a longer history than the Kelly motor and it's unknown what the Kelly motor is like.

Lead-acid batteries won't get you very far down the road at that speed.

__________________

- David Herron, Green Transportation Examiner, Green Transportation Info, The Long Tail Pipe, Electric Race News, davidherron.com, 7gen.com, What is Reiki
- Charger bike (rebuilt), Electrified Electra Townie, 1971 Karmann Ghia

gurkelur
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Joined: 07/25/2008
Points: 14
Re: Upgrading the EVT 168 to a motorcycle

Yes, I admit the wheels are a tad small. Perhaps this is just a passing night time madness.

Does 70 km/h sound plausible with the 3kw motor and the asian EVT controller? I've been driving a 65 km/h fossile scooter with 10" wheels for years, and I've allways felt safe. But that scooter did only weigh half of the EVT, so there's clearly much more momentum in the picture.

I'll go to sleep now.

gurkelur
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Points: 14
Re: Upgrading the EVT 168 to a motorcycle

I've been looking on different 125cc Vespa-scooters, and the wheel dimension on some models seems to be only one inch larger on the front wheel than the EVT 168. And those scooters have a top speed of 120 km/h..


Vespa S125

Now, my only concern is the frame. And the controller. The asian controller has 48V max input. How do I match the throttle input with other controllers, like Curtis? Any experience on this?

I'm going for for the 3kw hub motor. It will fit without any fabrication, and the efficiency is good.

dermutt
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Joined: 11/14/2007
Points: 20
Re: Upgrading the EVT 168 to a motorcycle

Hi gurkelur

I'll be really interested to see how your project works out!
Been wondering about that 3Kw EVT motor too so it'll be good to hear how it goes.

I've been running my EVT at 60v for some time now using the original motor and controller. (There was a thread about this some time ago).
In standard form the bike did about 31mph (50kmh) and at 60v it manages about 37mph (59kmh). The extra speed makes it safer in traffic on my commute.

If the roads are smooth, then the bike feels quite stable, despite the extra weight of the 5th battery. Any bumps do tend to upset it though - it really jars over them. I think the standard suspension and small wheels don't help. Changing the shocks and tyres would probably improve things.

The bike and frame as a whole seems fairly robust, although I have noticed the frame flexing a little bit over undulations and bumps in the road.

Anyway, good luck and keep us posted!

Johnny J
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Joined: 07/08/2008
Points: 330
Re: Upgrading the EVT 168 to a motorcycle

Yeah, better tires are necessary with higher speed.
These are the probably the largest that will fit.
D__ck.jpg

They are Metzeler 100/80-10 53L and will give you much better cornering and more stable bike.
Since they are larger, also higher top speed.
You need to pump them pretty hard.

gurkelur
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Joined: 07/25/2008
Points: 14
Re: Upgrading the EVT 168 to a motorcycle

Thanks for positive replies :)

I tried ordering the 3kw motor, but there was no option for shipping in the selecting shipping step. Strange. Email has been sent :)

Yes, the suspensions are weak. They meet the bottom with that unsettling clanck far too easily. Is there a standard for suspension, can I buy new one and change them without welding and drilling? To be wanting to carry trough such a project, it's a shame I don't know much abuot motorcycles.

Thanks for the tip, Johnny J. I'll locate some tires with the same dimension. Are those some new brakes?

reikiman
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Points: 8456
Re: Upgrading the EVT 168 to a motorcycle

The EVT throttle is a mechanical cable that goes into the middle of the controller and manipulates an thing that passes in front of an optical sensor. It's not directly compatible with a curtis controller as they require a 0-5k ohm resistor input. You may be able to adapt the mechanical cable to control a potbox and if so that would be compatible with the curtis controller.

__________________

- David Herron, Green Transportation Examiner, Green Transportation Info, The Long Tail Pipe, Electric Race News, davidherron.com, 7gen.com, What is Reiki
- Charger bike (rebuilt), Electrified Electra Townie, 1971 Karmann Ghia

Johnny J
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Points: 330
Re: Upgrading the EVT 168 to a motorcycle

Not new, old brakes..

Remove one of the spring-shockabsorbers, bring it to a good moped/motorcycle shop and find high quality ones that has similar length and mounting holes.

gurkelur
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Joined: 07/25/2008
Points: 14
Re: Upgrading the EVT 168 to a motorcycle

All right. I reckon the front brakes should be changed to disc brakes as well.

My dealer has a lithium battery solution for the EVT scooter with four packs of 12V, 40A and a weight of 7,5 kg (25 pounds) each. Two more packs makes it 72V. Could this be sufficient for a 80 km/h (53mph) speed?

dermutt
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Joined: 11/14/2007
Points: 20
Re: Upgrading the EVT 168 to a motorcycle

Not sure how you would mount a front caliper on the 168.

What about using the complete front forks and disc brake from a 4000e?
Perhaps that would improve the ride too - the 168 front suspension looks in keeping with the styling, but I suspect the telescopic forks used on the 4000e would work a bit better.

(Mind, I don't know if the forks would swap straight in, or if the frame geometry is the same on both bikes - I think the 4000e has a longer wheelbase.)

Diver Damon
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Joined: 02/15/2008
Points: 10
Re: Upgrading the EVT 168 to a motorcycle

What price are the 12v 40a lithium batteries you are referring to? I am currently running 5 lead acid batteries (60 volts) in my evt 4000e and top speed on a gps was 62km/h on the flat.

gurkelur
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Joined: 07/25/2008
Points: 14
Re: Upgrading the EVT 168 to a motorcycle

dermutt, that could might work :)

Diver Damon, the price was 1600$ for the complete 48V battery set when I called in June. The dealer foretold this price to be about 700$ next summer.

Diver Damon
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Joined: 02/15/2008
Points: 10
Re: Upgrading the EVT 168 to a motorcycle

It certainly would be nice if they dropped to $700.00. Who was the dealer that predicted this?

gurkelur
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Joined: 07/25/2008
Points: 14
Re: Upgrading the EVT 168 to a motorcycle

That would be the norwegian EVT importer and distributor. I know Think has started their production of electric cars with lithium a123 cells, and Tata Motors has plans of a battery factory here which will supply their new electric car with lithium ion batteries. I might get the chance to hijack some packs :)

Some bad news, though. It looks like I need to put this project on ice untill next year. Winter is approaching and it will be snow, ice and freezingly cold. Meanwhile, I'll try getting my fingers on the 3kW motor and have a chat with the local government about what specifications I need to meet.

Thanks for the help so far!

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