will these motors and esc give me extra speed?

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l300lover
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Re: will these motors and esc give me extra speed?

Post by l300lover » Mon Jul 17, 2017 11:56 pm

So HPI 15t are bad so should I go with some 21t 540 motors with the EVX-2 esc? And how do I use the esc with only 1 4s lipo battery? I thought you had to 2 batteries?

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Sixtys Guy
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Re: will these motors and esc give me extra speed?

Post by Sixtys Guy » Tue Jul 18, 2017 12:06 am

l300lover wrote:
Mon Jul 17, 2017 11:38 pm
why go with 2s and 2 HPI 15t motors? I thought you said the stock motors would handle the current better than any other 540 motor. Why not do the HPI motors with a 4s lipo? The EVX-2 esc can handle the 4s right?
The HPI Firebolt 15T motors work fine on 2S. On 3S they are great but life of them isn't!. On 4S I can only guess they will die very, very quickly.

I don't want to speak for Andy, but I think what options he has listed is;

* Stock 'Silver Cans' on 3S (or 14.4v nimh)
* HPI Firebolts on 2S (or 7.2v nimh)
l300lover wrote:
Mon Jul 17, 2017 11:56 pm
So HPI 15t are bad so should I go with some 21t 540 motors with the EVX-2 esc? And how do I use the esc with only 1 4s lipo battery? I thought you had to 2 batteries?
If you are going to put over 8.4v (2S or nimh) through a motor you really need to have a motor that is designed for it, like the Traxxas 21T 550 motors (and some other 550 can motors), which Andy has pointed out, will not fit in your truck. The stock silver cans will take 3S fine, but 4S might be pushing it.

Any motor designed for 8.4v max is going to have a shortened life on 3S and a dramatically shortened life on 4S (or 14.4v nimh).

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andymac0035
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Re: will these motors and esc give me extra speed?

Post by andymac0035 » Tue Jul 18, 2017 2:27 am

l300lover wrote:
Mon Jul 17, 2017 11:53 pm
You said in another post that the HPI 15t motors burnt up on you...
I was running 3S with those. On 3S those will run like a scalded dog, but they will burn up after a short while. They are meant to run on 2S. If you do that, they will be fine.

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andymac0035
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Re: will these motors and esc give me extra speed?

Post by andymac0035 » Tue Jul 18, 2017 2:37 am

If you are determined to run those 21T motors you will at the very least, need to 4-link your truck. This will give the extra room.

BUT......

I do not recommend doing this. You will find that doing the 4 link mod on a stock chassis will lead to LOTS of busted axle tubes. That will lead to buying aluminum versions to solve that problem. Then after that you will at some point mod your steering for better throw, only to find that the tires hit on the links and now you need wheel extensions (or jconcepts wheels) to fix that problem. Then your truck will look too wide and you will want to extend the wheelbase to make it not look so square... and I have not even gotten into shock mounts and servo placement on the axles.... LOL

All these things can be dealt with, but take a long look before you jump in is all I'm saying.

l300lover
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Re: will these motors and esc give me extra speed?

Post by l300lover » Tue Jul 18, 2017 4:40 am

Ae there anymore 540 motors that are forward and reverse around 20T?

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andymac0035
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Re: will these motors and esc give me extra speed?

Post by andymac0035 » Tue Jul 18, 2017 7:09 am

Not really. The 15T is going to be about equal on a single battery as the stock 27T is on 2 (nickle) batts, so going in the middle gets you a motor that is too slow on the lower voltage, and won't like running on the higher voltage. Both those motors have neutral timing, so they run either direction just fine, just reverse the wire connections on the rear motor.

l300lover
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Re: will these motors and esc give me extra speed?

Post by l300lover » Tue Jul 18, 2017 5:12 pm

Ok so I think I want to go 2 batteries on the stock cans. Sound good?

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andymac0035
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Re: will these motors and esc give me extra speed?

Post by andymac0035 » Tue Jul 18, 2017 6:38 pm

Yes. You will notice a nice gain in speed.

l300lover
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Re: will these motors and esc give me extra speed?

Post by l300lover » Tue Jul 18, 2017 7:06 pm

WHat happens if the stock motors smoke? Buy another pair of them? Why wouldn't these motors handle 14.4 volts if the stock ones will?

https://www.tamiyausa.com/search.php?q=53068

l300lover
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Re: will these motors and esc give me extra speed?

Post by l300lover » Tue Jul 18, 2017 7:31 pm

Does the full 14.4 volts go to both engines or 7.2 volts per engine?

l300lover
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Re: will these motors and esc give me extra speed?

Post by l300lover » Tue Jul 18, 2017 8:50 pm

Can I run 2 HPI 15T motors with 2, 7.2V batteries?

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andymac0035
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Re: will these motors and esc give me extra speed?

Post by andymac0035 » Tue Jul 18, 2017 10:22 pm

l300lover wrote:
Tue Jul 18, 2017 7:06 pm
What happens if the stock motors smoke? Buy another pair of them? Why wouldn't these motors handle 14.4 volts if the stock ones will?

https://www.tamiyausa.com/search.php?q=53068
The stock 27t turn motor is basically a drill motor. It's meant for use in the 12v range.... which is right where that 3S lipo lands you. The nickle batts are higher voltage, but they don't pack the amps so you can get away with the 14.4v.

A 23t motor is a hotter motor. It has less torque and more speed.

There is just something about the 27t motors and the stock clod gear ratio that makes all the planets line up.
The titans take all that and more, but they also take a lot more work and mods to unlock all the potential they have, as opposed to the stock 27t which is dead-simple.

Just keep in mind, you can buy what you like, we are just trying to make your life simpler and save you some money. :)

l300lover
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Re: will these motors and esc give me extra speed?

Post by l300lover » Tue Jul 18, 2017 10:33 pm

Cool definitely sticking with the stock 27T motors! And thanks to everyone this board is great!

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