Ezrun 9t

[TD2010]

Do anyone know what is the torque of this motor? In g/cm if possible please.

[kaiser]

i can't help with an actual #, but they are 380 rotors which make them spin high (rpm) but have low torque. which is why hw says they are intended for 1/12-1/10 on road cars.

[Percymon]

Got mine today and there is nothing all about motor specs. The 35a esc has guidelines as to motor turn limits, and there is noticeable difference in the recommended limit between on road and off road uses.

Had I realised 2 weeks ago the whole numbered turn motors were 380 rotors and the .5 turn spec ones 540 rotors I think I'd have chosen differently. Against that, I've only just managed to squeeze it all in my hotshot tonight and am yet to try it out.

[TD2010]

Got mine today and there is nothing all about motor specs. The 35a esc has guidelines as to motor turn limits, and there is noticeable difference in the recommended limit between on road and off road uses.

Had I realised 2 weeks ago the whole numbered turn motors were 380 rotors and the .5 turn spec ones 540 rotors I think I'd have chosen differently. Against that, I've only just managed to squeeze it all in my hotshot tonight and am yet to try it out.

So its better to get the 8.5 then? I would have never thought they will differ so much internaly... Its strange to me that I cant find the torque output of even one brushless motor, that while such info is available for most brushed motors. Everyone says their torque is so much more but I would really like to know how much more. Thats just the kind of guy I am. I like to have the specs of things I use. Like my car, I want to know what kind of fuel consumption I should be getting.

What about I make it easier?

In what range do you expect the torque to be?

A: 200 to 500 G/CM

B: 500 to 800 G/CM

c: 800 to 1000 G/CM

Even more?

[TA-Mark]

Brushless isn't usually rated like this. Motors are rated by their Kv (rpm per volt) and by Watts. The Controller (a brushless motor must have a controller unlike a brushed motor) is rated in Amperage for how much current it can sustain in both bursts and continuous.

If you take the Castle CM36S motors as an example, these are 500W, either 4600Kv, 5700Kv, 6900Kv, 7700Kv, (and for the nutters out there) 9000Kv. By comparison, a Mabuchi RS540-SH (the 27x1 turn one included in Tamiya kits) is 64.9W and 20,000rpm on 9.6v (expect ~48W and 15,000rpm on 7.2v). So about 10 times more powerful than the kit motor or enough to twist dogbones.

Hobbywing (EZ-Run) seem to only want to give you the Kv rating of thier motors.

[TD2010]

Brushless isn't usually rated like this. Motors are rated by their Kv (rpm per volt) and by Watts. The Controller (a brushless motor must have a controller unlike a brushed motor) is rated in Amperage for how much current it can sustain in both bursts and continuous.

If you take the Castle CM36S motors as an example, these are 500W, either 4600Kv, 5700Kv, 6900Kv, 7700Kv, (and for the nutters out there) 9000Kv. By comparison, a Mabuchi RS540-SH (the 27x1 turn one included in Tamiya kits) is 64.9W and 20,000rpm on 9.6v (expect ~48W and 15,000rpm on 7.2v). So about 10 times more powerful than the kit motor or enough to twist dogbones.

Hobbywing (EZ-Run) seem to only want to give you the Kv rating of thier motors.

That you can say again!

I see brushless motors have KT ratings. Their torque rating is then expressed in Inch/Oz, not G/CM like its for brushed motors.

Basically you will have a different answer at a different amp draw. Seems I will have to just accept that I will never know its torque rating in such a way to compare it to brushed motors.

[Blacque Jacque]

According to this page, the 9t is rated at 500w also.

They quote a maximum current of 45A, assuming 3s 11.1v that gives you the theoretical 499.5w.

That power output certainly won't be achievable on the 35A ESC except possibly in short bursts.

2/3hp from such a tiny little motor is quite scary really.

[TD2010]

2/3hp from such a tiny little motor is quite scary really.

Wonder how long my gearbox will last with this

[tamiya monkey]

ive seen the 9t/35amp esc in a re-re hotshot and it was balistic, im sure that the 380 size motors are more than enough for 2wd or 4wd buggies, i have an 8.5t in my slash, but intend on getting more 9t and 13t for my buggies, great systems for the money, and easy to program and change at the track.

[Percymon]

ive seen the 9t/35amp esc in a re-re hotshot and it was balistic

I will hopefully confirm that one tonight, and better order some gearbox internals just in case lol!

[kaiser]

i had my 9t in a df01 dirt thrasher and it was way faster then my friends two traxxas vxl's. it made my 4wd buggy wheelie like crazy. quite fun.

i think the 380's are ok for buggies, i'd worry about them, in monster trucks though unless the gearing was perfect. but gearing is important with any bl system.

that same 9t did melt down in my m03 though. (20tooth pinion)

[Blacque Jacque]

I have a 9t / 35A combo in my Blitzer & it's nuts even with 7.2v NiMh, see the thread here:

http://www.tamiyaclub.com/forum/index.php?showtopic=56816

[Percymon]

I will hopefully confirm that one tonight, and better order some gearbox internals just in case lol!

Programmed it tonight with some safe settings to preserved the Hotshot drivetrain, then popped outside the house for a shake down run. Yikes this thing needs some space as it's pretty quick. Even with the punch on minimum it takes off with ease, accelerates quickly and I was easing off the throttle after a few seconds. It's more than quick enough for me, small rotor or not. On grass it might be a bit slower, but very impressed for my £41 outlay. Well happy :)

[southy]

I have 5 Ezrun systems, 2x9t and 3x13t. These systems are the best bang for your buck I have ever seen in RC. Even though internally they are a 380 size motor, they punch well above their weight. Hobbywing also do 540 size motors but I have not bothered will them as the 9t has been enough power for any 1/10 car I have run them in. Maybe the 540 motors have more torque but as it is now when I run the 9t in my buggies with conservative settings if you mash the throttle they will wheely and flip onto their back, don't really need more torque.

With the program card they are very adjustable with just about every setting you need. I have seen some people complain about cogging but I have never had a cogging problem with ant of mine. I also have the Xerun (sensored) system. These are even more programable with the adjustable turbo timing and upgradable firmware.

[Gruntfuggly]

Have to agree - my 9T combo cost me £36 - apart from the obvious value for money, it's been reliable and fast. If it dies tomorrow it's been worth it...