11 inch diameter
how to reach 50-55 mph?
Hey guys im brand new, I need some help figuring out my first build
My goals are to have an electric kart that can get up to 50-55 mph at the most. Acceleration would be awesome too (anything more than a standard car) but id like to take this to work every day, it's not too long of a drive.
Anyways. Would a 72v motor get the job done? If I use a 72v, what should the gearing be? Im thinking about using motorcycle wheels fyi. Thanks in advance!
My goals are to have an electric kart that can get up to 50-55 mph at the most. Acceleration would be awesome too (anything more than a standard car) but id like to take this to work every day, it's not too long of a drive.
Anyways. Would a 72v motor get the job done? If I use a 72v, what should the gearing be? Im thinking about using motorcycle wheels fyi. Thanks in advance!
21 - 40 of 45 Posts
Mine will be roughly 20
That sound like an interesting project!
If you want a fun buggy, 72v is correct..., but If you want a high performance buggy, I would suggest you to start with a 1000A controller (like Zilla 1K or Ziva MC1000C).
Like that, you will be able to increase performance or upgrade if you want.
Here is a friend with his kart with Zilla set at 100v and 800A (if I remember correctly): http://www.youtube.com/watch?v=3UOToi0fHNs
Also, keep in mind that if you want high performance, you will need high performance battery ($$$$). No performant battery, no performant at the motor shaft...
If you want a fun buggy, 72v is correct..., but If you want a high performance buggy, I would suggest you to start with a 1000A controller (like Zilla 1K or Ziva MC1000C).
Like that, you will be able to increase performance or upgrade if you want.
Here is a friend with his kart with Zilla set at 100v and 800A (if I remember correctly): http://www.youtube.com/watch?v=3UOToi0fHNs
Also, keep in mind that if you want high performance, you will need high performance battery ($$$$). No performant battery, no performant at the motor shaft...
Ill look into it, thanks man
Has anyone heard of goldenmotor? They look like they have a lot of options, lots of power too.
Has anyone heard of goldenmotor? They look like they have a lot of options, lots of power too.
Soooo maybe 72v, but what wattage?
No, 13 hp continuous and a peak power around 26 hp isn't what I call "a lot of power".....goldenmotor? They look like they have a lot of options, lots of power too.
Especially with the low rating torque available from those motors (less than 25 lbs-ft). I can't find the peak torque of those motors with the HPC700H controller (their most powerful controller).
If you need to keep it simple and go with a 72v system, I suggest you to use an Alltrax controller. The SPM-72500 or the SPM-72650 coupled with a 8 or 9 inches motor should give you good performance. (evdrives.com)
If you need high performance, a 1000A controller coupled with an 9 inches motor will give you between 180 lbs-ft and 250 lbs-ft of torque.
With proper battery pack and if you keep the overall weight low, you can expect to beat everything on the road at low speed (0-60 mph).
You can also keep an eye on those AC motor kit who can do a good work too. http://hpevs.com/
About reverse, do you think about the idea to use a transmission coming from a small car (geo metro or other)?
And finally, please share picture if you have one!
I was going to try to keep it simple and not use a transmission, as most go don't have one.
As long as I can beat most things on the road up to 60mph ill be happy
Could I get a fancy controller that has a reverse or does it not work like that? I wish I had pictures but im still in the design phase
Ill look into alltrax. Was your first paragraph in response to my question about goldenmotors? I found a 48-92v 3-7.5kw motor from them
P
I would feel more comfortable (reason unknown) that I get most of my stuff from one manufacturer, golden has everything from throttle pedals, controllers, small water pumps for water cooled motors (I sorta like the water cooled idea-idk why) Maybe becuase it's a reassurance that everything will match up and work together
As long as I can beat most things on the road up to 60mph ill be happy
Could I get a fancy controller that has a reverse or does it not work like that? I wish I had pictures but im still in the design phase
Ill look into alltrax. Was your first paragraph in response to my question about goldenmotors? I found a 48-92v 3-7.5kw motor from them
P
I would feel more comfortable (reason unknown) that I get most of my stuff from one manufacturer, golden has everything from throttle pedals, controllers, small water pumps for water cooled motors (I sorta like the water cooled idea-idk why) Maybe becuase it's a reassurance that everything will match up and work together
If you don't use a transmission you need a LOT more torque or you won't be happy with the acceleration.I was going to try to keep it simple and not use a transmission, as most go don't have one.
As long as I can beat most things on the road up to 60mph ill be happy
Could I get a fancy controller that has a reverse or does it not work like that? I wish I had pictures but im still in the design phase
Reverse depends on the motor. With a Series DC motor it takes three full power contactors to flip the field winding polarity. With a permanent magnet DC motor it takes two double throw relays or four full power contactors to switch the direction. With an AC motor the controller can simply tell it to run the other direction.
Lets say your vehicle ends up weighing 1000 lbs. If you have 1000 lbs of force at the face of the tires you would be able to accelerate at 1G assuming enough tire grip. This would probably make you happy. You could make white smoke and squealing sounds would come from the tires easily. A WarP9 motor at 1000 amps will do 240 lb-ft (according to Tesseract's testing). So to get your 1000 lbs at the face of the tire you need a 1 ft radius tire and a 4.16 : 1 final drive. I think you indicated that your tires would be 20" diameter. This is a 10" radius which gives you a small mechanical advantage of 10/12 meaning your final reduction would need to be 3.47 : 1. So now you have a respectable amount of power on the road what does this do for your top speed? The WarP 9 has an official redline of 6000 rpm. At 6000 rpm with 20 inch tires and a 3.47:1 the vehicle should be traveling 102.88 mph. Of course this depends on the battery voltage because with only 72 volts the torque starts to taper off at around 1500 RPM (25.7 mph). Double the voltage and you should have full torque to 51.4 mph. This will take a pretty impressive battery.
As always, your mileage may vary. I am not a professional and I don't even play one on TV.
Interesting, but mine will wiegh no where close to 1000, its going to be as small as possible and as light as possible, its a go kart, not a car, so there will be no glass or doors or metal besides what is required, maybe 600 with me in it at most (im 160)
But really, what kind of voltage/watage/amperage should I be looking for?
But really, what kind of voltage/watage/amperage should I be looking for?
Lighter is better. Look at what other people have done in a similar sized vehicle and then try to decide if the performance will be what you are looking for.
That's the problem though, no one is making an overpowerd street legal go kart, and if they are, it's a car
So voltage doesn't make power? Wattage does?
So voltage doesn't make power? Wattage does?
Actually I found a 20kw 72v (26hp) .....would this be powerful enough
Volts * Amps = WattsSo voltage doesn't make power? Wattage does?
Actually I found a 20kw 72v (26hp) .....would this be powerful enough
Watts/746 = horsepower.
Watts = power.
I don't know how much you would need to be happy. If you had a 26hp ice on your go cart would that be enough? And torque is the important thing for driver satisfaction.
Happy is beating the majorty of stock cars on 0-60 and eventually reach 45-60 mph
This is what the kart my daughter & I built will do is this what your looking for I can give you all the spec.
http://youtu.be/YPl6U_ez_K4
http://youtu.be/YjMTe8cLe2U
http://youtu.be/YPl6U_ez_K4
http://youtu.be/YjMTe8cLe2U
If that 71.2 is the top speed, yes I would love to know everything youve used/done. Can it reverse?
Define "overpowered?That's the problem though, no one is making an overpowerd street legal go kart, and if they are, it's a car
?
When does a kart become a "buggy" ?... wheel size , weight, speed ?
When does a "buggy" become a car ?
A doubt a "kart" , in any traditional form,..can ever be made legal for road use ( unless you are thinking of a Golf Cart type device)
2
Sorry no reverse simple contractor can fix that
71.2 mph current top speed should be faster next weekend
1.21 to 1 gear ratio
Weight with driver 350
7.2 inch diameter hi-lo motor 86 lbs.
I'm running an Alltrax spm 48300
(when you floor it I bypass the controller and allow the motor to pull straight from batteries.
8 Nissan leaf batteries
2/0 wire that is being upgraded to 4/0 getting a little to warm several more upgrades within next month
Hopefully get 60 foot time down to 1.5 sec
1.21 to 1 gear ratio
Weight with driver 350
7.2 inch diameter hi-lo motor 86 lbs.
I'm running an Alltrax spm 48300
(when you floor it I bypass the controller and allow the motor to pull straight from batteries.
8 Nissan leaf batteries
2/0 wire that is being upgraded to 4/0 getting a little to warm several more upgrades within next month
Hopefully get 60 foot time down to 1.5 sec
I have a neighbor of mine make a dune buggy (gas) street legal
Slimdog would you mind sharing the specs of your and controller? Maybe gear ratio?
Slimdog would you mind sharing the specs of your and controller? Maybe gear ratio?
21 - 40 of 45 Posts
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