Why is my Wraith slow?

[73bronco]

I have a decently upgraded Wraith that I have just pulled out of hibernation and started making a basher/speed only type of rig. I've upgraded all of the links, servo, knuckles, C hubs, etc. I just installed a Mamba Max Pro and programmed it for 100% power in forward and reverse. I also installed metal trans gears and 32p pinion and spur in the 58/15 flavor. I am running 3s. I am guessing it's top speed is 8 mph and I feel it should be much faster. I tried 4s on it and didn't notice much difference. I am guessing the issue is the motor. It is a Novak 13.5t sensored brushless motor. I had it running 58/14 and it didn't really change anything. I was not really wanting to get the Novak motor but it was all my favorite crawler shop had in stock so I grabbed it. The low end power just isn't there either. It will not pull a tire in the air no matter how hard I hit it. I am running no weight in the wheels or on the car at all. Battery is still in the stock spot.

I ran a HH Crawlmaster 13t on 4s with a HH waterproof ESC and it was quite a bit faster than I have right now. The brushed motor did not like the 4s power though. On 3s it was a similar speed as I have now but with lower(slower) gearing at the spur and pinion.

What say you? What is it going to take to get this thing going fast?

[maslin]

Something is wrong... bound up or worn out.

[73bronco]

Originally Posted by maslin

Something is wrong... bound up or worn out.

Drivetrain spins free. Pinion and spur are spaced properly and the motor is brand new.

[maslin]

A 3300kv motor geared at 3.8:1 on 3s should fly, like 20-25. Try it sensorless and see what happens

[73bronco]

Originally Posted by maslin

A 3300kv motor geared at 3.8:1 on 3s should fly, like 20-25. Try it sensorless and see what happens

I thought it should too. I will pull the sensor and see what happens. Thanks for your input.

[EeePee]

Battery okay? Got more than one? Does it get warm at all after a full charge?

[Eric0424]

If you're wanting some speed try a Tekin Pro4 4000kV or the Castle 1410 3800kV 4-pole 540, and make sure you're not running the under drive gears (43/13) in the axles. The 13t and 13.5t motors really weren't designed for high speed/high RPM power.

Maybe consider the over drive gears (36/14) in both axles as well as the Pro4 or Castle 4-pole 540's.

[73bronco]

Originally Posted by EeePee

Battery okay? Got more than one? Does it get warm at all after a full charge?

I've run it on 3 different 800mah 40c 3s packs, 2 different 1300mah 40c 3s packs, one 2200mah 40c 3s pack and a 2200 mah 40c 4s pack. Not one has changed how it has reacted. I am wanting a bigger pack anyway so I am going to stop after work and get a bigger pack. The batteries are not even lukewarm after charging or running the wraith. The motor is slightly warm after running the entire 2200 mah 3s pack through it at mostly full throttle.

[EeePee]

Originally Posted by Eric0424

13.5t motors really weren't designed for high speed/high RPM power.

It should be fast. 3300 rpm per volt is far from slow.

[73bronco]

Originally Posted by Eric0424

If you're wanting some speed try a Tekin Pro4 4000kV or the Castle 1410 3800kV 4-pole 540, and make sure you're not running the under drive gears (43/13) in the axles. The 13t and 13.5t motors really weren't designed for high speed/high RPM power.

Maybe consider the over drive gears (36/14) in both axles as well as the Pro4 or Castle 4-pole 540's.

I'd love to buy another motor but I just bought this one and it really should be much faster than it is. My next motor will be a Pro4 but in reality this motor should be plenty fast enough for now. At least a hell of a lot faster than it is.

[EeePee]

Originally Posted by 73bronco

I've run it on 3 different 800mah 40c 3s packs, 2 different 1300mah 40c 3s packs, one 2200mah 40c 3s pack and a 2200 mah 40c 4s pack.

Please don't run a fast motor on low millamp packs. Not good. 2200 is safer. And 4S on a 13.5 should be retarded fast. 36,300 rpm at full squeeze at 11.1 volts. 48,840 at 14.8!

No battery temps means no work is being done. Your ESC setting correct?

[Eric0424]

Double check your ESC settings and check the transmitter as well. Sounds like you may only be giving it half throttle with the batteries not changing anything and the motor running relatively cool.

[73bronco]

Originally Posted by EeePee

Please don't run a fast motor on low millamp packs. Not good. 2200 is safer. And 4S on a 13.5 should be retarded fast. 36,300 rpm at full squeeze at 11.1 volts. 48,840 at 14.8!

No battery temps means no work is being done. Your ESC setting correct?

The 800mah and 1300mah packs were only used as a quick test. I have seen enough RCs catch on fire to know better. I was looking for retarded fast and definitely have not gotten it.

I hooked the castle link up before doing anything and set the MMP up with 100% power for forward and reverse and calibrated the radio properly.

[Eric0424]

Which Novak 13.5 do you have? Novak part #3614 (Ballistic Crawler) is only rated at 2000kV.

Ballistic Crawler Brushless Motors [#3614, #3618, #3619] Novak Electronics

[73bronco]

Originally Posted by Eric0424

Which Novak 13.5 do you have? Novak part #3614 (Ballistic Crawler) is only rated at 2000kV.

Ballistic Crawler Brushless Motors [#3614, #3618, #3619] Novak Electronics

Ding, ding ding. I think that is the reason. It is a 13.5t crawler motor. Sounds like I will be talking to them about returning it. Thanks for finding that!

[JohnRobHolmes]

You can drop a small diameter rotor in it for better speed, or I would recommend a 10.5 or 9.5 stator for the rotor it has. Or return it if they will let you.

[73bronco]

Originally Posted by JohnRobHolmes

You can drop a small diameter rotor in it for better speed, or I would recommend a 10.5 or 9.5 stator for the rotor it has. Or return it if they will let you.

I'm hoping they will just let me return it. I don't really want to have to buy another part for a brand new motor they recommended to me when they knew I was going for speed only. They are very good so I am hoping they take care of me.

[EeePee]

Ah, crawler version. Yeah, they'll getcha with those.

[73bronco]

Just a quick update, the best hobby shop in Colorado took care of me as expected. Novak 13.5T crawler motor will be replaced with a Tekin 13.5T redline gen 2 motor on Friday. Bought a 60c 3300mah 3s to go along with it.

[Eric0424]

You're going to hate me for saying this, but there's two Redline Gen2 13.5's also. However, one is #TT2407 @ 3400kV and the other is the #TT2406 "RPM" version @ 3600kV. Both are definite upgrades in the RPM department, so you should be fine with either one.