Motor / Esc for RC8T-e - RC-Monster Forums

Nard Cox · 04:00 PM

Hi all,

I'm planning on buying a RC8T-e real soon. What motor and Esc are recommendable for this truggy?

I'm not planning on spending a fortune (don't know how much is needed) so a used (but still in good shape) one is also fine. I do want some 'quality' motor and Esc like Neu / Tekin / Pletti (but this is expensive right) etc. I've seen TONS of motors and Esc for sale here but there's so much to choose from that I'm kinda lost. Some examples would be much appreciated.

Another question : Does anyone have a link to a decent write up on how the 'higher voltage / lower temps' thing works, sounds all very interesting.

Thanks guys!!

ps. I currently run a Rustler VXL on 2S and a Savage Flux on 4S. I currently have six Turnigy 5000mAh 20C packs with TRX leads. But if you can give me some links for nice LiPo's I will consider buying them also.

EDIT : The ''PUI'' formula (P = Watt / U = Voltage / I = Amps) P = U / I
So if I keep P the same with a higher U then I will be less. That's the whole trick ?

wallot · 09.24.2009, 04:38 PM

I am building RC8T for a fellow racer and I will use RX8 + CC2200kv motor for 4S
For 5S i would get RX8 + Neu 1415 or 1515 1700kv motor

I am very happy with my 1415 1700kv motor in my mugen.

Nard Cox · 09.24.2009, 04:42 PM

Thanks. I think that 4S will be enough. I currently drive the Savage Flux on 4S and it's all the power I need, besides the Savage Flux is heavier then the RC8T-e if I'm not mistaking.

I send some people (with stuff for sale) a PM, so I'll just wait to here their prices :). I have to say that this Tekin drives very smooth. My MMM is stuttering like crazy when I want to drive real slow.

wallot · 09.24.2009, 05:31 PM

With battery choice it is not just about power. Higher voltage systems run cooler.
Neu 1415 - 2200W. If you run it on 4S it ould draw more amps than on 5 or 6S -> same power but more heat :)

Yes T8 is smooth as it is sensored. however with reliability of T8 motors I would go for neu or CC motor. Just to many broken rotors. We got quite a few T8 motors and all failed with original rotor and now even few with the new style rotor.
Also T8 motor is quite heavy compared to Neu 1415.

Nard Cox · 09.24.2009, 05:37 PM

Hi there. I've read about that rotor problem before, doesn't seem like the smartest investment I should make then.

About the 4S and 6S story. If I would run 6S I would need to reduce gearing to get the same ''end speed'' right? Without making adjustments to the gearing I would be only drawing more amps. But then the tricky thing is to consider battery tray size and weight. I can put like 20S (if I would have a 20S esc) in there but don't think that would help the handling of the car.

06:07 PM

The gearing will have to change slightly, but not dramatically - when you switch to higher voltage, you need to switch the motor to match it (in most cases, but certainly not all)

you can go lower in the battery mah rating when running higher voltage aswell which will yield the same results as a lower voltage setup - but again - you will be running cooler...

the 6s setups look to be the best bet power and efficiency-wise, but 4s will do the job just fine - just lose as much weight as possible on a 4s setup - pretty sure most places run 15 minute mains anyway, so it's not that big of a deal...

i am yet to...
a) run my truggy at a track, and
b) run anything higher than 4S tho, so cannot speak too much from experience - just what i have read =)

I am hopefully gonna get a chance to run my mbx5t at a track on sunday, so will post how it goes... i originally opted for the tekin rx8 2000kv truggy combo, but wasn't thinking through the conversion, and mounted up a neu 1512 during mock up, assuming the T8 would be the same (long story as to how that happened) - i was wrong... so i'm gonna try the 1512 2.5d i have from the buggy (and swap the T8 into the buggy) in the truggy on 4s, and see how it goes - will go back to the drawing board and throw in the T8 if it doesn't go well enough...

Nard Cox · 05:06 AM

But with lower mAh packs you need to be sure that the C rating is higher enough to still produce the minimal A recommended or does this also decrese? Like with the Flux they recommend getting 120A at least. So with a 4000mAh LiPo I would need to have at least 30C to still get that 120A. Or does this 120A also decreases?

I've never driven on a real RC track before. Till now I've just been bashing my cars (nothing extreme). But last weekend we made a little 'track' on the BMX track and we just raced (who could finish 3 laps the fastest for example). It was so much fun that I decided I wanted a good racing truggy to hit the tracks someday.

Nard Cox · 09.25.2009, 03:40 PM

Question : Would a Neu 1515 1y be a good motor for a RC8T-e?
What about this Esc Hobbywing eZRun 150A ?

wallot · 09.25.2009, 04:37 PM

1515 2200kv will be more than OK ;) but get a proper ESC.

Nard Cox · 09.25.2009, 06:53 PM

So I guess the eZRun is not what I'm looking for then? Because I really liked that programmable card thing :) .

A Tekin RX8 Esc is about 140 euro ($210) new! A complete set is like 220 euro new ($330) , that means the motor is pretty 'cheap' 80 euro ($120). That's pretty steep I have to admit, especially since the above eZRun Esc only costs 80 euro ($120).

Where can I by some connections for motor wires? Like some 5,5mm connectors and connectors that go into the MMM Esc?

09.25.2009, 10:47 PM

Seeing as though you are in Europe, maybe you are better looking atsomething more readily available over there like BK or kontronik etc... MGM-compro/schulze and lehner are some others you may wanna look into if you have some dosh... Others may chime in with other suggestions...

I don't know much over Europe-way, but I have dealt with Rob at ace-cars.de before (my LST conversion is on that site) with good results... He is in Germany tho, but it's still closer than the states hehehe. Shoot off an email to him and he'll be able to help with any questions you may have :)

Nard Cox · 09.26.2009, 05:09 AM

Yup, I'm from the Netherlands. Don't mind buying something in the States because it's WAY cheaper there. Only thing that kinda sucks would be sending a item back for repair.

I've never heard of BK or Kontronik, Schulze and Lehner I do know but they are not that good available (used at least). I will send Rob an e-mail and see if he has something interesting to offer me.

Thanks 4 the help so far!!

07:56 AM

ahh, i see then =) Well, Rob may have some cheap alternatives for you - i'm sure any option he has will be a reliable one - otherwise, all the best with whatever you decide on man =) Let him know my LST was going really well untill i snapped the main deck, so he will be getting an email from me in the near future -lol-

Snipin_Willy · 09.26.2009, 09:48 AM

I wouldn't be put off by buying a hobbywing ESC. They have a much larger footprint and giant fan mounted to them and almost non-existent customer support. And be aware of the timing bug. If I recall, setting it to "0" will result in a blown up ESC.

Nard Cox · 06:17 AM

Yeah I did read about that timing bug thing. Looks like the Tekin is the 'best' choice, anyone have one and wants to sell it ??

EDIT: What kind of pinion does the RC8T-e take? The 0.8 Mod one?

EDIT: timing set to ''1'' I guess, thread here.

EDIT : just read this complete thread. Looks like there are a lot of people who have good experience with the eZRun 150A pack.

EDIT :
Tekin RX8 1/8 scale competition Brushless ESC = $200
Castle Creations Mamba Monster controller V3 = $155
HobbyWing 150Amp 1/8 car ESC = $100

EDIT : Does Mike also sell the HobbyWing programmable card (would want this IF I would decide to buy that eZRun 150A Esc), couldn't find it on the site.