Direct Drive to Diff E Revo Build

[sikeston34m]

Originally Posted by johnrobholmes

I have the permatex green, didn't realize it was medium penetrating. I will probably stick with epoxy then. Only place I know that carries loctite brand would be online retailers.


The conversion from Wye to Delta is 1.7 winds, so a 10 turn Delta is equivalent to a 10/1.7 turn Wye - almost 6 turns. This keeps kv constant. The conversion from a 10 turn D at 980kv to a 6 turn Y is as follows: [10T/1.7=5.88T] [980kv x (5.88T/6T)] = 961kv with a 6T Y termination. Substituting the 6 for any other wind count will give kv with Y termination.

Looks like the 3032 with a 6Y on 4s lipo will be pushing it pretty hard. 15k rpm, don't know how well the ring bearing will take it.


One thing I didn't think of for startup is the length of wire and the inductance on a coil. The ESC will sense a higher strand count coil better, so maybe this could cause lower kv motors to start up better. Not a product of motor torque as much as the ESCs increased ability to see a higher wind motors position? The issue with total motor power always gets me when thinking of startup. To me any 1000watt motor should start up the same unless the wind count is on the extreme end of things. Probably not the most accurate assumption.

I ran the 3032/10 in an E maxx. It was running pretty warm. It would start good and had great acceleration though. The 3032/10 is 823kv. You might want to back down from the 980kv some.

[sikeston34m]

The 5S1P 4000mah run lasted a little less than 20 minutes. These are older 10C cells. I've ran them pretty hard all summer in the E maxx, so I doubt they are quite putting out 4000mah anymore. I bought these batteries in Feb.

Battery temps are 120 degrees. Motor is at 100 degrees and the ESC is 115 degrees. All still well within range.

The 5S Lipo setup runs exactly like the 6S1P A123 setup. I couldn't really tell any difference as far as performance goes.

I'll try 6S 4000mah Lipo next. We should see some real gains then.

[aqwut]

Originally Posted by sikeston34m

The 5S1P 4000mah run lasted a little less than 20 minutes. These are older 10C cells. I've ran them pretty hard all summer in the E maxx, so I doubt they are quite putting out 4000mah anymore. I bought these batteries in Feb.

Battery temps are 120 degrees. Motor is at 100 degrees and the ESC is 115 degrees. All still well within range.

The 5S Lipo setup runs exactly like the 6S1P A123 setup. I couldn't really tell any difference as far as performance goes.

I'll try 6S 4000mah Lipo next. We should see some real gains then.

What's Amps is that motor rated for?...

[sikeston34m]

The 6S 4000mah Lipo run lasted 22 minutes. Motor is at 105 degrees. Batteries are at 102 degrees and the ESC is at 115 degrees.

I think the Monster Pro 125 would suit the 6S setup better. I believe I seen the 80amp thermal while running WOT in the grass. First time for this, I was a little shocked and puzzled.

This is harder to control. Severe Tire Swelling and a large increase in Top Speed. I believe we have surpassed the 60 mph mark. I was running on the outer road by the interstate. I can almost keep up with traffic!

It will wheelie at speed now, especially in the grass. It will spin all 4 of them on the asphalt.

I'm very impressed with the motor temps. The fan seems to be working to keep temps low. Seeing the fan as an option is alot of the reason why I decided to go with AXI. I think this motor can do well even on 7S Lipo.

I love the Revo. It handles so much better than the E maxx especially at high speed. The suspension is so much better.

[sikeston34m]

Originally Posted by aqwut

What's Amps is that motor rated for?...

Here are the specs from the Manufacturer's website.


4120/14 Specifications
No. of cells 12 - 16
4 - 5 Li-Poly
RPM/V 660 RMP/V
Max. efficiency 85%
Max. efficiency current 20 - 40 A (>82%)
No load current / 10 V 2 A
Current capacity 55 A/60 s
Internal Resistance 41 mohm
Dimensions (diameter. x lenght) 49,8x55,5 mm
Shaft diameter 6 mm
Weight with cables 320 g

The addition of the cooling fan increases it's current handling ability I believe.

[johnrobholmes]

Outrunner ratings are near useless for car use I have found. On startup we burst a helluva lot more than the ratings, and our throttle use determines the average amp draw. The only numbers of interest to me are the Io, kv, and rpm ratings. Just because it is a 55a motor doesn't mean it wont pull 80 amps continuous or more when accelerating. The continuous ratings are more useful in planes where the prop load is very consistent. Prop to the continuous rating and the motor won't overheat.

I don't doubt you cut the ESC out with that motor. Im actually surprised you are getting such top speeds without overheating it.


I can fit 5 parallel strands of 24awg wire in the 30 series stator, with 4 winds per slot dLRK style. 8 turn with 5 strands.

[sikeston34m]

Originally Posted by johnrobholmes

Outrunner ratings are near useless for car use I have found. On startup we burst a helluva lot more than the ratings, and our throttle use determines the average amp draw. The only numbers of interest to me are the Io, kv, and rpm ratings. Just because it is a 55a motor doesn't mean it wont pull 80 amps continuous or more when accelerating. The continuous ratings are more useful in planes where the prop load is very consistent. Prop to the continuous rating and the motor won't overheat.

I don't doubt you cut the ESC out with that motor. Im actually surprised you are getting such top speeds without overheating it.


I can fit 5 parallel strands of 24awg wire in the 30 series stator, with 4 winds per slot dLRK style. 8 turn with 5 strands.

8 turns with 5 strands?

What do you estimate the kv as being on that with a Delta versus a Wye termination?

[johnrobholmes]

710vk with 8Y if the starting kv of 980 is correct. Luciens site states the 10D wind is 980 kv, don't know if they changed specs a bit since you got yours.


Now I know why they use 30awg. Getting just one strand of 24awg wire neat against the stator is a pain.

[johnrobholmes]

Just realized I was looking at the wrong motor specs, so the kv would be 604 for an 8Y wind.

[sikeston34m]

Originally Posted by johnrobholmes

Just realized I was looking at the wrong motor specs, so the kv would be 604 for an 8Y wind.

That's not a bad place to be IMO. So are you going to go with the Wye termination?

What truck are you planning on going with? The Revo?

I just did another run "test".

4S 10,000mah Lipo yields 52 minutes of pretty hard runtime.

40 minutes into the run, I thermaled the ESC again. This wasn't showing up with the lower capacity batteries. I think this Revo will be getting a Monster Pro for Christmas.

Maybe do a small Cap mod, then attach it to the Aluminum mounting plate with some thermal compound. That should work well for this system.

After the 52 minute run, temps are:

Motor = 125 degrees
ESC = 105 degrees
Batteries = 95 degrees

These Lipo's can give 100 amps continous with 150 amp Bursts. It shows in the performance too. I can tell there's alot less voltage sag under a load, especially compared to the 4000mah Lipo's.

After seeing how things went today with the different voltage levels, I prefer the 4S Lipo Best. With this motor, anything above that, it gets hard to control.

With this setup On 4S Lipo, You will find Nitro parts in it's droppings!

[sikeston34m]

Hey BL Revo, need to clear some messages out of your box. I can't send you a PM through there.

PM me your email address and I'll send you the videos.

[johnrobholmes]

I dont know what I will put it in. The only ride big enough is my x1 CR and I still haven't gotten satisfactory battery trays made up for that one yet. I am going to try a smaller outrunner in a wheely king rig first I think. I messed up the winding on my first try today, and I could fit another strand or two in as well.

[BL_RV0]

i wouldnt get the 125b, it has the same overheating issues that the 80b does, unless you do the mod, but that voids your warranty.

[sikeston34m]

Originally Posted by BL_RV0

i wouldnt get the 125b, it has the same overheating issues that the 80b does, unless you do the mod, but that voids your warranty.

I'm pushing alot of power through the 80b, and I know there is some seperation from the heat sink inside. I've had it apart a bunch of times.

The Monster Pro 125 has a higher rating because it has more FET's on the power card. This also means less resistence, so more power flow.

I really like the Quark line, mods or no mods.

[johnrobholmes]

I switched to 5 strands of 22 awg wire. Crikey it is hard to wind tight! Took more than an hour for one phase of the motor, only 2 left. With all this work I will leave all 6 ends open so I can switch from D to Y termination on the fly. Just so happens that a 8D on 3s is almost exactly the same rpm as an 8Y on 5s (wattage should be the same too). Time to test this kv VS startup torque thing.