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-   -   Brushless 4wd truck (http://www.rcuniverse.com/forum/rc-giant-scale-cars-234/11248276-brushless-4wd-truck.html)

sparky 25 10-02-2012 07:40 AM

Brushless 4wd truck
I'm thinking of swapping out my 26cc engine for a brushless motor,

Don't plan on buying any conversion kit,

gonna fabricate a mount from 5mm alloy plate and attach to the alloy 26cc engine mounts,

I would like to keep running 2 stroke but my area for running doesn't allow for noise,

Anyone know of a place to buy good quality but not very expensive 1/5 scale motors?

What kv rating would suit this truck?

sparky 25 10-10-2012 12:15 PM

RE: Brushless 4wd truck
Ordered a 730kv 55/92 motor with 8mm shaft,

Will be using a hobbyking 150a esc on 6s for power,

sparky 25 10-28-2012 08:00 AM

RE: Brushless 4wd truck
1 Attachment(s)
Motor fitted,

along with Robinson racing extra hard 16t pinion,

Need to get some esc connectors, as the motor only come with the male 8mm connectors,

DarkFire989 10-28-2012 08:12 AM

RE: Brushless 4wd truck
Looks awesome sparky!

sparky 25 10-28-2012 08:27 AM

RE: Brushless 4wd truck

Hope to get it running this weekend

Lars from Norway 10-28-2012 03:06 PM

RE: Brushless 4wd truck
With this setup you should theoretically get about 16200 rpm unloaded from the motor. A gas engine will run somewhere between 19 and 21000 rpm, so a motor with a KV on 900 would get you closer to the rpm's of a gas engine. Or, you can add more cells, maybe 8, but i see the ESC won't take more than 6S.

I like the work you have done here! :)

sparky 25 10-28-2012 11:30 PM

RE: Brushless 4wd truck

I was thinking it won't have the top end of a gas motor,

But it will have alot more low down power than my 26cc engine,

may change the gearing after the first run,

Going to get an 8s capable esc for Christmas.

Lars from Norway 10-29-2012 02:37 PM

RE: Brushless 4wd truck
Yes, you will have a lot of torque at the bottom revs, so you have more to change the gearing on. Just don't overgear and overheat :)

sparky 25 10-31-2012 12:57 PM

RE: Brushless 4wd truck
Got castle 8mm female bullet connectors put onto the esc today,

Charged up the lipos and bench tested the truck,

My god it has some serious torque, Hope it runs as good on the ground

Some Very slight cogging at extremely slow speeds, but hey its not gonna be run as a rock crawler:D

C.lyra 11-01-2012 01:13 PM

RE: Brushless 4wd truck

sparky 25 12-23-2012 03:15 PM

RE: Brushless 4wd truck
Due to wet weather I never got to run the truck outside yet,

But I'm already thinking about 8s running,

What do you guys think of this esc?


It looks upto the job,

but there aren't any reviews yet,

sparky 25 12-27-2012 01:42 PM

RE: Brushless 4wd truck
Just ordered the turnigy trackstar 200A 8s capable esc,

Il post a vid of the truck running 8s when the esc arrives,

phmaximus 12-30-2012 07:17 PM

RE: Brushless 4wd truck
Dammm 8s... I'm keen to see it go. Let's us know how's the drivability is vs the gass motor.

sparky 25 01-07-2013 02:55 PM

RE: Brushless 4wd truck
1 Attachment(s)
was gonna wait and order a bec but decided to run a seperate battery for the rx and cooling fans,

if the its dry outside on saturday il run it with a video,

bench ran it on 8s,

Lars from Norway 01-07-2013 03:26 PM

RE: Brushless 4wd truck
Interesting conversion you got there! Have you weighed it and compared battery vs. gasoline-setup?

sparky 25 01-14-2013 01:58 PM

RE: Brushless 4wd truck
Sorry, haven't been looking at this thread in a while,

I'm unsure about the real weight difference compared to the gas engine,

But fully loaded with four 2s hardcase packs to make 8s,

I'd say that it feels a little bit easier to carry around than with a gas engine,

Haven't ran it yet, rain never stops here.

huw4027 01-16-2013 03:37 PM

RE: Brushless 4wd truck
Very nice indeed.[8D]

sparky 25 01-17-2013 07:16 AM

RE: Brushless 4wd truck
Trucks been sitting ready for a test run for over 2 months now,

Rain won't piss off, and its giving a chance of snow at the weekend,

I did however fire it up inside the house today and i can say its not recommended,
Brushless 1/5 is hard on carpet[X(]

first pull of the trigger the truck lept up onto its rear wheels and left a black mark on the carpet about a foot long,

Think I have the most of it cleaned with carpet cleaner, hope my woman doesn't notice[:o]

sparky 25 01-19-2013 07:54 AM

RE: Brushless 4wd truck
The snow arrived,

so running the truck is out of the question for another while,

I turned the punch control up to 100% just to keep the truck from falling and set the truck up on a couple spare wheels to test out the ubec I fitted,

Seems to run just fine,

Will turn the punch control to zero and post a vid of the truck outside when this snow decides to clear.


sparky 25 01-27-2013 08:40 AM

RE: Brushless 4wd truck
FINALLY got to run the truck outside,

I did notice one thing before I started running it,
that there was some resistance and the truck would not free wheel very well,

Do fg 4wd trucks free wheel easily or is it the tension in the drive belt that creates resistance?

After I took the video I continued to run the truck for another 10mins or so,

then i put the temp gun on the motor and it read 182f so I shut it down,

I'm guessing that the lack of free wheeling is holding the motor back and putting extra load on it,
Time to pull the drivetrain apart and see what's binding,

Any how il upload a vid shortly.

sparky 25 01-27-2013 09:50 AM

RE: Brushless 4wd truck

firestone 01-27-2013 01:08 PM

RE: Brushless 4wd truck
nice brushless conversion sparky excellent video

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