EREvo with MM 2650 System !

[reddy]

EREvo with MM 2650 System !
will it work good
as a matter of fact i m stuck with it ask my brother to order a 2200kv system and he ordered 2650 !
what will be the best gearing for it !

[vxlrocket]

EREvo with MM 2650 System !
will it work good
as a matter of fact i m stuck with it ask my brother to order a 2200kv system and he ordered 2650 !
what will be the best gearing for it !

yes, it'll work great in it. i run the 2650 in my revo and i love it. I run 54/22 (sometimes 24) for gearing on 4S and it's as fast as a 2200 on 5S. no worries at all, it's a great system for the revo. i actually prefer it over the 2200 for this truck.

[reddy]

HEHEHEH !!! thanks ! my worries r over !
but mine is with Proline 40 series 3.8 tires

[vxlrocket]

HEHEHEH !!! thanks ! my worries r over !
but mine is with Proline 40 series 3.8 tires

me too. i run the 40 series badlands

[87 GN]

lower the kv the more torque....

On 2/2S lipo with the 2650kv motor:

18/68 = 35mph
18/62 = 38mph
18/58 = 41mph
18/54 = 44mph
20/54 = 49mph

[reddy]

i think i will go for 20/54

[vxlrocket]

with my old e-maxx tires (5.75's) and a 24t pinion, the speed calculator says i'm doing 64mph. with the 22T, 59mph.

here's the variables:

Enter Front/Rear Differential Gear Ratio:
Traxxas E-Revo - 2.85:1

* Enter Transmission Gear Ratio:
Traxxas E-Revo - 1.83:1

†† Enter Additional Gear Ratio :1

* Enter Spur Gear tooth count :
Traxxas E-Revo/3905 E-Maxx - 54T

* Enter Pinion Gear tooth count:24T

* Enter total battery voltage :
4.2v Lipo max
4 cells
* Enter kv rating of brushless motor :
Castle Creations 1512/1y 2650kv - 2650kv

* Enter tire diameter in inches :
Traxxas Maxx (old) - 5.75"

Spur/Pinion Reduction Ratio :2.25 : 1

Total Reduction Ratio :11.74038 : 1

Tire Circumference :18.06 inches (458.83 mm)

Rollout :1.54:1

Total Motor Speed :44520 RPM

Theoretical Maximum Vehicle Speed :64.87 mph (104.2 km/h)
http://scriptasylum.com/rc_speed/top_speed.html

[87 GN]

* Enter total battery voltage :
4.2v Lipo max 4 cells


I figure the Volts at 3.7v nom = about 5 mph difference


20/54 2/2s 48.86 mph 3.7v
20/54 2/2s 55..47 mph 4.2v

copy paste in link above ~ import
change cell count & gearing

Differential Ratio: 2.8461538461538463
Transmission Ratio: 1.8333333333333333
Other Ratio: 1
Spur Tooth Count: 54
Pinion Tooth Count: 21
Total Voltage: 22.20
Motor KV: 2200
Tire Diameter (inches): 5.9
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0.006
Spur/Pinion Ratio: 3 : 1
Total Ratio: 15.65385 : 1
Tire Circumference (inches): 18.54 inches (470.8 mm)
Rollout: 1.18:1
Total Motor Speed: 48840 RPM
Vehicle Speed: 54.76 mph (87.97 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

[vxlrocket]

I'm wondering why you chose 3.7? My lvc i set at 3.6. Now i understand your variables as to how you calculated your speed. Perhaps a mid range voltage would also be a good representation since we were calculating both ends of the spectrum of possibility.

[reddy]

my MM system came with M 0.8 pinion can i use this with erevo ?

[humayrayakongkinaon]

my MM system came with M 0.8 pinion can i use this with erevo ?

mod.8 and 32 pitch are the same so, yes you can use that pinion.

[65535]

Technically speaking under load lithium batteries provide approximately 3.7V (nominal voltage).

Realistically using 3.7V as a battery voltage for those calculators is far more accurate than full charged voltage as there is serious sag under the loads the power system draws.

[reddy]

mod.8 and 32 pitch are the same so, yes you can use that pinion.

18t pinion came with system have to buy a new 1

[reddy]

at last it arrives time to go monster mad !

[humayrayakongkinaon]

picture not working, let me know how this motor perform i might consider getting this for my build.

[87 GN]

I'm wondering why you chose 3.7? My lvc i set at 3.6. Now i understand your variables as to how you calculated your speed. Perhaps a mid range voltage would also be a good representation since we were calculating both ends of the spectrum of possibility.

3.7 v per cell so on so on.. Don't really have a good answer that is the preset voltage. I agree that is a bit low, but at the same time 4.20 is not a true voltage either, voltage drop. A happy medium say 4.10 or 4.0v maybe...?? What do you think. Might have to start posting the V, when posting gearing speed....

[50togo]

on my merv and neu 1110 1/y i was seeing drops below 3.4 and with the 9000kv motor to 3.2v
when i do some testing with the erbe with my eagle tree v4 /gps i will post some numbers running stock motor stock gearing and spc 5000 50c batteries