AL3xGR

I have a Hyper Mini STe.I need a new motor.Many peopleuse about 5000kv motors on these trucks.(some people).
What is better for me? What will have more torque and run cooler? I'm planning to mostly use a 2s lipo and a 150A esc.

The two motors are:
Castle Creations CM36-5700 motor (3s lipo,5700kV) (2 pole motor)
Novak Ballistic Racing motor 7.5T (2s lipo (I ran 3s on the 5.5T Ballistic without problems,so the 7.5T seems to be able to handle this voltage) , 5800kV) (multi-pole - 6 pole motor)

BUT some people say that CC's rotor is heavier(larger) so it has more torque.

Also,If you have something else to suggest plz tell me.I need about the same kV rating to be able to use only a 2s lipo and reach this top speed I want.(50-55mph)(or maybe 60mph sometimes)

Any reply would be greatly appreciated

***Values for the ScriptAsylum speed calc. (for everyone that needs them)

Differential Ratio: 3.2
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 42
Pinion Tooth Count: 19
Total Voltage: 7.7
Motor KV: 5700
Tire Diameter (inches): 3.2
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.21 : 1
Total Ratio: 7.07368 : 1
Tire Circumference (inches): 10.05 inches (255.35 mm)
Rollout: 1.42:1
Total Motor Speed: 43890 RPM
Vehicle Speed: 59.07 mph (94.88 km/h)
Effective KV Value: 5700
KT constant: 0.24 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

Redvanmafia

Castle motors

Krazy Chicken

his truck isn't an 1/8 scale buggy, it is a 1/12 scale truggy, idk where you see 1/8th scale.

Redvanmafia

Im sorry krazy chicken!, jeeze dont give me a hard time

Krazy Chicken

i didn't.

ludeman

Get the Castle SCT Sidewinder package for 120 cant go wrong

ThunderbirdJunkie

My Feedback: (3)

x2 on the Sidewinder SCT setup. If ThunderbirdJunkie were in the market for JUST a motor, he'd buy that.

LHS has it for $99.99 too[:@]

AL3xGR

3800 is too low for the batteries I'm planning to use.I want to use only 2s lipos.
5700 and 5800 motors on 2s and with 14T pinion will make my truck go 55mph.
I was thinking of buying SCT too,but I should use 3s lipo.The motor and the esc will overheat on 3s.(I'm not sure.Maybe it won't have any problems because my truck is 1/12...but it's like a 1/10 scale - 2.4kg)

AL3xGR

Which to get?
Novak 7.5T 5800kV (2s only)
Castle 5700 (2s only)
Sidewinder SCT (3s only - I have to wait for someone to try it on 3s - temps.....) I need something for 2s

AL3xGR

2s
+less weight
+lower temps

-less runtime than 3s

3s
+more runtime than 2s

-more weight
-higher temps

2s>3s

I have 6 2s lipos (runtime of each pack won't be a problem)

I need something that works on 2s.

Slo-V Flyer

Actually.... if you are comparing a 2s to a 3s pack, both of 4000 mah capacity for example, then you CAN get same or better runtime the 2s pack. If you were to keep the same gearing when running the 2s and then 3s, you'll notice your 3s will drain just a few minutes faster. I have this happen all the time. I run a 2s 5000 mah lipo and 3s 5000 mah lipo on my Slash geared 21/84. I always get a couple more minutes or so of runtime extra from the 2s.
The reason I believe is the extra voltage also causes extra amp draw (which is probably also why motors heat up more with more voltage without re-gearing).

In any case, 2s is lighter, but also remember you will have to gear it way up to get 45-55 mph in a 1/12th TRUCK. If this was a touring car I can see that, but a truck with a 5800 KV motor on 2s...I don't know how possible that is, especially if it all weighs close to 3 KG (6 lbs) after battery weight is added.

ThunderbirdJunkie

My Feedback: (3)

In a Hyper STE? There shouldn't be a power issue.

Running a 3200kv motor in an SC10, and it's borderline too much on 2S.

Proper gearing is key.

AL3xGR

The voltage difference between full charge and cutoff for a 2s is 2.4V and for 3s 3.6V
I will make a lighter chassis too.2.4kg is with a 3s lipo on truck.Lighter chassis and 2s lipo will drop it to 2kg

AL3xGR

I know...the gearing is the key.But the question isn't what gearing Ishould have.The Q is which motor would be better for this gearing.

AL3xGR

@ Slo-V Flyer.5000k isn't too high.I won't use it off road.You have a Bandit with a 3.5T motor too.

Slo-V Flyer

Hah yes you caught me. Then again that Bandit is too much for off-road. It has street tires, balanced and barely ever reaches top speed in the short distance I have to drive it. And the motor runs cool, usually not over 120-140*F on 7 volts, geared from 21/78 to 25/78, about 15-20 minute runtimes.

Typically I've noticed the higher Kv motors that are unsensored, like the Mamba, and such do get hotter in off road truck applications.

Also, the low voltage point you mentioned, doesn't make sense to me. How is usable voltage span going to make a practical difference? Like I said, in my experience driving 2s and 3s, I tend to get better runtimes with the 2s. I run my 2s from 8.36 volts down to about 7.4 volts before stopping. My 3s lipo goes from 12.5~ volts down to 11.3 or so. I still get about the same overall runtime, with the 2s usually running for a bit longer if not about even sometimes.

In any case, I think it might be a little tough to get 55 mph with 2s and only 5000 kv. That's what I meant to say. If you see my Bandit videos, going 55-65 mph took a 3.5 turn 10,000 Kv sensored motor using some good 6-cell Nimh or average 2s lipo. I believe your truck will have a bit of a challenge ahead.

AL3xGR

2s lipo 5800kV.If I need higher top speed (SAY that the motor can handle a gearing for 100mph) I must use a motor with higher kv or gear up?(to prevent heat problems)

Slo-V Flyer

I calculated using some rough figures, that in order to go 50 mph, using 3.5" tall tires, you need the wheels/tires to spin at 5280 rpm. Your 5800 Kv motor might spin around 46400 rpm @ 8.0v (fully charged 2s lipo under load for example). In order to reach 50 mph you would need a final gear ratio of 8.78:1. That is of course a rough estimate, and the gearing is PRETTY tall for a truck, but it is 1/12th scale, BUT it is also quite heavy @ 4-5 lbs.

AL3xGR

So? HigherkV? (less pressure on shafts and gears )

EDIT:I added you as a friend on youtube

Slo-V Flyer

If you use a bigger pinion on a 5000 Kv motor, or use a normal pinion on a 6000 Kv motor, the spur gear and tranny will still see the same increase in RPM, so there's no real benefit between them in that sense.

I would say since you're limited to 2s (even though the benefits of 3s is way more efficiency since you're trying to reach high speeds) gear up with the 5800Kv motor to attain your goal. It will most probably heat up regardless, but if you keep the tires balanced (and I'm assuming it's 2wd?) it might just work.

AL3xGR

It's 4wd.I will take the Novak...
Compared to Mamba 5700 motor,which has more torque?

Slo-V Flyer

They both should have enough torque. However, in my experience and many others on here, the Castle 5700 motor will most likely heat up trying to over gear it.
Also, from my experience, the Novak motor, assuming you get something like a 5.5R or 6.5R 540 sized motor, should run cooler and be able to put up with being geared up for speed, on 2s.

However, my question is still, why not simply use 3s? You only need a 3s 4000 mah 20-25C motor and with a 8.5 Novak motor, or Castle 4600 Kv, either will give you 50 mph. The 3S does not weigh that much more (maybe 4-5 oz more?) than 2s.

AL3xGR

With the 2s lipo I will use a 60A ezrun esc or a cheap 100A HK.For 3s I only have Hobbyking's 150A esc.(It's huge.....)

I wont get the 6.5R.I will get the 6.5T for Ballistic series(Same with the velocity series)

Why not 2s?(You said the runtimes are longer)

049flyer

My Feedback: (18)

The difference between these two companies customer service is a critical consideration.

Items I have sent to Novak for warrant consideration were totally ignored. They just kept the items without any communication with me. No email no phone call nothing! Multiple requests for information on the items were ignored. On those occasions where I actually spoke with someone they denied ever receiving the items and then when presented with the delivery receipt promised to call back and never did. Hobby King has better customer service than Novak!

Castle creations on the other hand is top notch. Warranty issues are always dealt with in a timely manner and usually in my favor. Communicating with them is always easy and pleasant. One of the best in the industry and worth paying a little more for the product. Plus most if not all of their stuff is made in the good ole USA.

Let's all work to keep fellow Americans employed.

ScottStaypuff

Gotta agree, I don't exclusively buy Castle but the stuff I have is good and their customer service/warranty stuff is great! I especially like that you can get a replacement for out of warranty items for a reduced cost from them.