The don of Razor e300's dual 6374 + vesc 6.6

Lightweight / Folding / Portable EVs - seats optional
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Ianhill   100 kW

100 kW
Posts: 1357
Joined: Sep 25 2015 5:55pm

The don of Razor e300's dual 6374 + vesc 6.6

Post by Ianhill » Jul 10 2018 12:28pm

If any of you have read my stuff before then you'd call me Mr Razor as I cut my teeth on these things and now I sharp as one.

I have a current build with a razor e300, hydraulic disc brakes and 140mm rotors all round with a 68tooth rear and 10 tooth front for a 6.8 reduction, I can use a single 130kv 6374 motor and vesc 6.6 to be geared for 30mph at 12s with 60amp constant rated it should get down the road decent and rev to around 6k rotor rpm but I'll have to get a high quality 25h chain the cheap crap will do for mock up but I got a source of high quality industrial stainless chain.

So I've thought why should the skateboarders have all the fun of dual vescs with CAN connection and motors with foc and field weakning on a ride that weigh's next to nothing.

Below I have included a picture of my back wheel setup as it stands it's been converted to 6.5 inch rims and I have a quality set of pmt wet tyre's to go on, with no freewheel mech so it constant drive suitable for regen.

As you can see there's not much spare room around the disc side of the wheel but it's possible to fit a 68tooth sprocket either side of the wheel with a spacer to set out the sprocket on the disc side and run a dual chain rear wheel with regen rear brake only and hydraulic disc front, remove the stock 250w motor and drop 2 6374 motor's side by side on a big alloy heatsink/bracket so there's differing chain length's each side and the motors sit side by side with the width of a motor can and a little breathing space to different the chain length, the ground clearance will be excellent and two stainless 25h chains will be more than upto the job keeping the tooth step small so the gearing is compact.

The motors could then be geared for 52mph with a 190kv motor, 68tooth rear and 12 tooth front giving 5.66 gearing with a rotor rpm of 8.5k rpm so it would sound sexy when its blasting along, it's a dream and an expensive one but it would weigh nothing and go like the clappers, but I'm more likely to go single motor it's more suited to my pocket, Anyone want a dual drive one built give me a shout I'll happily put the death trap together and be the first to one wheel peel her out and drop 12s 120amp (5.3kw nominal) into the back wheel and part the road like bruce almighty.
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Fastassmotors   1 W

1 W
Posts: 58
Joined: Jul 10 2018 12:09am

Re: The don of Razor e300's dual 6374 + vesc 6.6

Post by Fastassmotors » Jul 10 2018 10:25pm

Any tips on how to install disc brakes on front and back? Was it a kit?

Ianhill   100 kW

100 kW
Posts: 1357
Joined: Sep 25 2015 5:55pm

Re: The don of Razor e300's dual 6374 + vesc 6.6

Post by Ianhill » Jul 10 2018 10:59pm

No its not a kit, I got the wheels from my larger brushless scooter thats been stripped and i had a set of hydraulics for a mtb, the front at the moment is attached with a plate I made that locks on the wheel axle and a pipe clamp, it works a treat.

On the rear I just drilled 2 holes in the correct place to line up with the caliper mount and then used 6mm sleeving around 10mm to space the mount out.

I've got a bracket for the front fork to weld the disc mount on but I'm waiting to work out my motor dimensions so a friend can tig an alloy bracket for the motor mount that I can then finish up and weld my disc brake mount to the fork.

Ianhill   100 kW

100 kW
Posts: 1357
Joined: Sep 25 2015 5:55pm

Re: The don of Razor e300's dual 6374 + vesc 6.6

Post by Ianhill » Jul 17 2018 5:32pm

Had a lucky find today and scored some new wheels. they will need a refurb and one hub is missing along with the discs so I'll need a new hub, sprocket, discs, valves, bearings and axles, On the plus side they are alloy and two piece rims so I can take them apart to get the stubborn sized tyres on with less hassle and no damage and they come with a decent spare pmt tyre so I have 4 decent italian spare racing tyres now.

I can still use them tubeless with a little lick of seal up and threaded valves, get them balanced so I got a road worthy set of wheels all new with race grade rubber and then put them in a scooter with some serious power.

My razor is working on stock motor with a 24v brushed 500w controller and a 8s 24ah lipo pack, its got adjustable throttle and speed settings so Its kid friendly, I may keep this as is and start a fresh build custom frame so I can get the space I need to mount a lmx 8kw motor and 20s lipo while keeping it compact I've got my spare 1600w brushless scooter to pinch the headset from and then start from scratch around it with a decent quality build budget as possible.
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