[mcneil84cj]

I've installed a 36v controller and 4 - 12v 12ah batteries to my kids razor and it only reaches 10.6 mph.

How can I get more speed from this set-up? New motor?

After running for 5-6 minutes you can smell the motor.

Thanks!
84CJ

[bassiclyLouDog]

48v on a 24v motor? smoke. it'll be fun for a couple blocks, but that smelly burnt copper smell will put you to a halt. I tried just using partial throttle...didn't work. not even a mile.

[mcneil84cj]

That right. Only a matter of time.

So should I get a 36v motor or just run the 24v with 36v?

I would like to reach the 13-15mph range.

[aidanworthington]

yes a bigger motor is what you need and a new rear sprocket
most people bolt a 750-1000w motor up top
ontop of the original motor mount
all you have to do is drill 4 holes and bolt it down
and trimm the body work to allow the chain to pass

1000w.png (54.57 KiB) Viewed 3378 times

[mcneil84cj]

Motor mod, gothcha

Thanks

[robnewyork]

ur motor is shot when u smell copper, plan out ur gearing , voltage amperage and rider weight and we can steer u

[bassiclyLouDog]

I know I bring it up a lot, but 2 small motors can be just as good if not better. Think 2 350watt are almost 20amp current a piece...there's 40amps to play with and the heat can be dispersed over 2motors instead of one. You can also run more volts than with just one motor. 2 24v motors can run up to 72v. On the flip side you run 48v on high amps and not burn out. Of course you'd have to upgrade batteries to run 100amps but you can probably run 50amps easy with what you have.

[robnewyork]

the one mcdesign ran 4 250 watt motors, made a unite 1000 look stupid, but simple logic

[bassiclyLouDog]

Too bad there's no simple way to mount to motors in a pocket mod. Lots of room for batteries. Sit down so the weight wouldn't be as scary. I suppose a face plate and a couple Currie types to bolt in. I just saw a 450 for $45...not a bad deal but again an industrial for$105?! Yeah. No comparison

[mcneil84cj]

Should I go with a 36v motor and run 48v to it to get additional speed?

Thanks!

[robnewyork]

Yes...or the cuuie 900 watt 24 v and run at 36 v for even greater top speed.

[mcneil84cj]

Thanks guys I'll let you know how this turns out.

[mcneil84cj]

Actually the 36v controller I installed is good for 1000w, so would it hold up if I go with the currie 900 at 36v?

Thanks again.

[mcneil84cj]

I thought of one more question, about the throttle. It's currently the original throttle. would this limit in any way the full potential of the currie 900W motor?

If so, any suggestions on which throttle to use?

[robnewyork]

the throttle plays no part, goin from 36v motor to 48 v pack is 33 percent gain top speed, goin from 24v motor to 36v speed controller yeilds 50 percent,.. if u have the skills id do 900watt motor on 50 amp controlller, gain torque and speed all at once,any hall throttle will work.

[mcneil84cj]

currie 900W motor is on its way!

I just confirmed the controller I installed is rated for 1000w and 28 amp's max
http://www.monsterscooterparts.com/36vocove1.html

How will this effect the performance? of the currie motor at 36v?

[mcneil84cj]

Anyone render a guestimate on how fast the dune buggy will be with the 900 @ 36v?

Plan is to complete the project by New Years. Once complete, I'll post a video of it with confirmed MPH.

[maurtis]

I used this calculator on my Dune Buggy build and it was pretty much spot on: http://www.compgoparts.com/TechnicalResources/JackshaftRatioCalculator.asp

Once you enter the sprocket sizes, motor RPM, and tire size you can play around with the sprocket ratios to increase speed or torque. The easiest one to change is the motor sprocket, of course.

Is this a 24V Currie? I see a couple online rated at 2,600 RPM at 24V. If that is the one, and you are using the stock gearing at 36V, you are looking at 3,900 RPM. If stock speed is 8 MPH, you should see 12 MPH. That is what we saw on ours when we went from 24V to 36V on the stock motor.

The stock controller is a 20A controller, so the 28A controller will give you some more torque. Not neck snapping torque, but should be noticeable. Running a 50A controller would definitely be an upgrade you feel, without smoking the motor.

[mcneil84cj]

could you point me to a site where I could pick up a new motor sprocket?

Looking for 15-18 mph - approximately how many teeth?

Sorry, that calculator link is a bit more than I can digest (at this point)!

Thanks.

[mcneil84cj]

http://www.superdroidrobots.com/shop/it ... eeth/1394/

This site seems to have what I need. I'm thinking either the 15 or 17 tooth sprocket as a replacement. Does that make sense to achieve my 15-18 mph goal?

[robnewyork]

i dont think on stock controller it will climb much,and tnc is simpler

[robnewyork]

tnc scooters

[mcneil84cj]

i dont think on stock controller it will climb much,and tnc is simpler

Sorry, I do not follow.

As previously mentioned in this thread, I've upgraded the controller to 36v 1000W 28amp.

Are you saying there would not be enough torque if I went with a higher tooth count in the engine sprocket?

[robnewyork]

that motor is a beast, 24 v is cool but u need 40 amp plus, also the motor comes with 15 tooth sprocket as i recall giving u 12 mph

[mcneil84cj]

http://www.monsterscooterparts.com/24-v ... ocket.html

11, is what the web site says.

I'll see how it goes as is and then play with a different controller/sprocket.

Thanks!

[robnewyork]

crap the 500 is 15 tooth, change rear sprocket add amps, or volt at 36v

[mcneil84cj]

I have a 15 tooth motor sprocket on order.

Here are a few videos of the tests so far with the original motor.

https://www.youtube.com/watch?v=JQUbC7thFpU
https://www.youtube.com/watch?v=ow8UrUVRjFA

[bassiclyLouDog]

your video explains everything a lot better! 48v on the stock 24v motor will fry it..QUICK! running 36v on a 24v motor will give you a 50% speed gain. running 48v on 36v motor will give you a 30% gain. motor current is listed in amps, the higher current, the better performance(speed ) The higher amp controller, the more torque it'll produce. The trouble here is 36v controllers are rated between 28-40amps, when you step up to 48v controllers, there are 50 and 100 amp models available.
You alreaday have batteries and a controller, your best route my just be stepping up the motor to a larger 24v. If that doesn't do it, get a large buttocks 36v, run it on 60v lol!

[robnewyork]

run that 900 watt at 36v, and maybe 50 amps if u can find it, kelly makes one, but it will handle 36v 28amps no issue no heat..top speed should be 50 percent gain.

[robnewyork]

look for a 40 plus amp controller, that motor is a tank..

[mcneil84cj]

Motor is in, at 48volts it is able to lift the front tires off the ground = kids favorite toy.

Check out these videos:
http://youtu.be/bgrmaYQDRF0
http://youtu.be/4vpRP7niL9w
http://youtu.be/M30ZwhgMp_Q
http://youtu.be/T2dfylWTpK4

Thanks for all the help! Once he gets comfortable, the next mod is a new chain and a 15 tooth sprocket (motor).

Curtis

[robnewyork]

man amazing results , what controller are u using ?? i saw 36v and 48, nice job

[mcneil84cj]

http://www.monsterscooterparts.com/36vocove1.html

This is the controller I'm currently using.

[robnewyork]

watch ur voltage dont sag beyond 44 volts, the controller wont know better

[mcneil84cj]

Would you recommend a different one? My plan is to stay at 48volts, can't go back now.

Also, would you recommend changing the motor or axle sprocket? Changing one with more teeth would make it faster, right? You saw, there is no worry about torque, so for pure speed whats the best option?

Thanks again Rob!

[bassiclyLouDog]

I'm going to caution again. 24v motor plus 48v equals smoke. Awesome vids but I'd hate to see a project burn out. When you smell burnt copper its usually too late. Check and see how hot your motor is getting. You may get away with such a light test pilot.

[robnewyork]

well hes running low low amps might be fine , 28amps 48v is only 1344 watts

[bassiclyLouDog]

ran my pocket mod with a 30amp razor controller took less than a mile to fry it, but i weigh a lot lol...good rule of thumb is never more than 1.5X overvolt, but as he says he already went there so thee is no going back lol

[robnewyork]

its the overall watts that count, what motor was it ?? keep in mind a unite 24v 250 watt will handle 60 volts on 10 amps carrying a mouse in a 12th scale rc car ..

[aidanworthington]

just to comferm things
this is my unite 250w running at 50 amps 24v =1200w lol
and still running today.
The motor does get mighty hot but its holding togeather (for now)
https://www.youtube.com/watch?v=fjzBUYGLM8o
I guess its a power to weight thing like rob says