brushless 1/5 4wd conversion about to begin! couple questions. - Page 2 - RC-Monster Forums

Arct1k · 06.21.2009, 09:17 PM

low voltage cutoff

Ryu James · 06.21.2009, 09:18 PM

Quote:

Originally Posted by Arct1k

low voltage cutoff

DUH! i knew it was something obvious. thanks. see how much i depend on you guys!

Unsullied_Spy · 06.25.2009, 12:13 AM

The 2215 will be PLENTY of power for that truck, 2230 will just rip up parts.

Ryu James · 02:25 AM

Quote:

Originally Posted by Unsullied_Spy

The 2215 will be PLENTY of power for that truck, 2230 will just rip up parts.

really? here was my reasoning for getting the 2230. i run a 14oz 1515 in a 9lb truggy. most people use either the 17oz 1521 or the 22oz 1527 to power a 12-14lb monster truck or muggy. well the 2215 is only 24.8 oz. it just seemed that if people used a motor that is 3-5 ounces heavier to power a truck only 3-5lbs heavier then going up another 5 ounces to the 2215 would not be enough for another 10-15lbs of truck. the rampage will weigh around 25lb i believe. it just seemed the 48 ounce 2230 was better matched.

the good thing is that i have 10 days to return one of the unused motors for a full refund. i would be willing to sell one for what i paid. these motors are not easy to find and when you order one you are looking at 2-3 months to get it sometimes. at least that is what i was told.

Spy, have you had the chance to run both the 2215 and 2230 on 1/5 vehicles? or what application do you have experience with the these motors? thanks for the heads up by the way.

Unsullied_Spy · 06.25.2009, 02:41 AM

Check out MasterBlaster (CoolRunnings on this forum) and his Baja 5b conversion. Mike is doing the conversion on it and he said 60+ MPH out of a ~24 pound Baja was easily possible and that it would just spin the tires until they got warm, then it would flip over backwards with the power. A 1521 in a 12-14 pound truck will keep the front wheels in the air without a problem and will push a 8-9 pound 1/8th Buggy to 90+ MPH. A 1527 is a little less powerful than the 2215 but I think the larger rotor diameter will give you more torque and that motor is so overpowered in any 1/8th scale truck it won't be usable, so the 2215 should be plenty. I don't know what the 2230 was built for, they're airplane motors but it must be to power an absolutely massive plane.

Ryu James · **Got Started Today!! -** 06.29.2009, 05:33 PM

so the buggy finally arrived today and i immediately got to work.

i stripped of the clutch/drive unit, gas tank, etc.

i have already modded the truck shell to fit so i now have a pretty cool looking truggy.

i have a FG Marder Beetle shell coming as another shell. i love those beetle shells.

so here is what i figure: i think getting the servos and speed control mounted wont be to hard as there is plenty of room. i know where i want to put everything on the chassis, what type of motor mount i will use, and battery tray but the main challenge with this project is going to be the center diff/spur gear. so here are some pics and some of the things i have done, tried, and or about to try. any help that anyone can provide on this would be great. if i can just find a spur gear from another kit that will work that would be so much easier than having a custom gear made.

so here are the specs on the stock gear. the center hole is 12mm in dia. and the 4 outer holes are for m4 screws and are spaced 18mm apart. the diameter of the complete gear is 55mm and 31t.

what i have done so far is flip the center diff unit around so that the motor shaft and pinion will reach the spur gear without hitting the center diff mount. i also flipped the center diff upside down as this allows the spur to sit higher off the chassis. i can flip it either way depending on what size spur i end up getting. i figure i will need a spur gear between 36t-42t which i think anything in that range will fit no problem.

here are some options i have found so far but i am open to suggestions or especially links to where i might find a spur gear that would fit right up.

First, Smartech makes a center diff unit excatly like a 1/8. it has the brake pads on the outdrives and its an actual viscous, bevel gear diff unlike the locked redcat diff. so i might just get the complete smartech center diff setup and mod the chassis so that i can mount it up. still would need a spur gear but this might be the esiest way to run the mech brakes.

http://www.oversizerc.com/c/230533/2...are-parts.html

Second, i have thought of just using the 5b differential and having a custom center diff mount made.

or what if i buy a gear like this and have it machined/drilled so that it will work? are these gears even possible to drill a hole in? i know they are hard as hell but wondering if drilling would work. this is a 37t spur gear and would be ideal.

Ryu James · 06.29.2009, 05:35 PM

just a pic of the 2215 compared to a Tekno Nue 1515 1y.

and the 1/5 compared to my RC8T.

kulangflow · 06.29.2009, 06:09 PM

You should run that beast at Black Sheep when you're all done. It's looking good so far!

Ryu James · 07:02 PM

Quote:

Originally Posted by kulangflow

You should run that beast at Black Sheep when you're all done. It's looking good so far!

i am worried because of the size and weight of these things that it would be a bit clumsy. i have seen some vids on youtube where they seem to do alright on a track but probably nowhere near as good as a 1/8 truggy. i will bring it down for sure though just for kicks. any suggestions on how i should handle this spur gear? i just found a 2215 Neu with a 5mm shaft so it made me think of just running mod1 pinion and a 1/8 center diff. i could do that but then would have to run smaller dogbones and i am sure they would just break.

magman · 06.29.2009, 07:05 PM

WOW that motor is huge!

kulangflow · 06.29.2009, 07:40 PM

I believe Monster Mike makes some incredibly strong custom dog bones. You should hit him up about it to see what he suggests. I know he's done some 1/5 conversions before.

Arct1k · 06.29.2009, 08:30 PM

I would flip the motor to front right and run saddle packs - you have the room...

Ryu James · 06.29.2009, 11:33 PM

Quote:

Originally Posted by Arct1k

I would flip the motor to front right and run saddle packs - you have the room...

thats a good idea. i might try to do that. that would put more weight forward for better steering response and i have been a bit concerned about having all the weight so far back.

Ryu James · 07.01.2009, 02:47 PM

Quote:

Originally Posted by Arct1k

I would flip the motor to front right and run saddle packs - you have the room...

so i think this is going to be ideal. here are some pics of the layout this way. this layout will require i use the 2215 since the 2230 is too long to fit.

here are a couple of pics of the 2230 that just came today. thing is a beast. it would be fun to try this motor just to see what would happen. not sure if i will be able to though.

i have a couple of questions about servos. i have been looking for a 1/4 scale high torque servo. the highest rating i have found is like 300oz which seems low for a truck this size. i have the standard size JR9100 HVT servo which is capable of 480oz. so it seems this would be the better choice or will it not work as well since it is a smaller servo? is it ok to use a standard servo as long as it has enough torque?

brushlessboy16 · 07.01.2009, 02:54 PM

HO-LY CRAP that is a beast of a motor! If you really wanted to you could move the packs further outwards and slide the center drive unit to the rear and allow you to run the 2230..... as for the servo- i dont think the size of the case matters as long as it has the torque to turn the wheels how you want them... Good luck- cant wait for the rest