Brushless MGT 8.0 underway.... - RC-Monster Forums

10kman · **Brushless MGT 8.0 underway.... -** 01.19.2011, 07:38 PM

So I posted a couple weeks ago about the status of the Associated MGT 8.0 as a worthy monster truck to invest in. I don't see a lot of them around, and they are for some reason not even on ebay, not in the numbers you see a Savage, T-Maxx, etc. I was nervous to do another MGT conversion, but I love the truck to death. Tough as nails, and easy to work on.

Started looking on ebay, got a fantastic deal on a used RTR 8.0 with barely any use. Couldn't pass it up. I was toying with buying a chassis and building it all up from scratch, but with the price I got, and knowing I can sell off the nitro stuff for more cash yet, it wasn't worth it.

Got it in, and stripped it down to clean and start the layout. I had to find a way to lock the tranny into 2nd gear, and also lock the tranny so I can have reverse without any of the extra servos and complexity like my original conversion a few years ago. That one I had forward only, but also ran a mechanical brake, to keep things from overheating. I'm confident in the MMM right now so am going to try the tranny locked, and use the ESC's braking.

Figured that all out after some internet searching. Turns out if you do the forward only conversion, then lock the 2-speed from there, you're golden. So that's what I did. I'd post more about it, but honestly I couldn't describe it well enough and have it all together, so no pics either of that part. Link here - http://www.ultimaterc.com/forums/sho...t=65876&page=2. Also, link here to the original thread on RCM - http://www.rc-monster.com/forum/showthread.php?t=27932.

Powerplant of choice is a Castle 1518 1800 k/v motor. Went that route for more torque than my 1515 1/y I have sitting in my E-Revo right now. As mentioned too, using the MMM for my ESC. Maxamps 4s Lipo 8000mah battery.

Mounting the motor - way easier than my original one that involved a lot of fabrication on my end. Tekno RC makes lots of motor mount options, went way smoother and was actually easy.

My only real mod that I've done other than the tranny is I had to grind the back of the transmission case down so I had enough room to fit the motor in there, and have some wiggle room for pinion choices. I did that to fit my 16t pinion in there, but I'm ideally using an 18t anyway. Just wanted some options.

So pics below of where I am now. I could probably steal the ESC and Receiver from my E-Revo but I'm saving to get another setup. Not quite sure if I want to sell the E-Revo yet. I'm excited, I'm curious how the truck does with the 1518 motor in there, i'm looking for some gut-wrenching torque and I think this will provide it!

10k

10kman · **And some more pics.... -** 01.19.2011, 07:40 PM

Pics here....

Overdriven · 01.19.2011, 09:52 PM

Looks like a good start. Keep us posted.

DwightSchrute · 01.21.2011, 10:56 PM

great idea to use the tekno motor mount. my friend just scored an mgt for $70 and was wondering what he could do to convert it. i'm gonna send him this link...nice build so far!!

10kman · **Update 1-27-2011 -** 01.27.2011, 06:04 PM

Update. I have it pretty much ready to rock in the pics below. I had it out on a test run with the stock blue springs, and it was ridiculously soft. I had some progressive rate ones on their way, finally got them, threw them on, made a huge difference, the truck has ground clearance again.

I cleaned it up, routed wires, found a radio box in my spare parts bin, threw in a nice high-torque steering servo, factory team steering kit, have some factory team shock caps coming and will finish that up with 50wt oil with the progressive springs, and I think that'll be it for a little while.

Haven't run it with the new springs, I'm hoping it solves the squatting problem (I'm sure it will, i can drop it and it doesn't bottom out like before). We just got 15 inches of snow, so I'm trapped for a bit for any good video posts. Don't worry, I know the rules of the internet, no video, no one cares. :)

Pics below. Hopefully video to follow.

Scott_T · 02.02.2011, 09:26 PM

Hey 10K,

Any reason you stuck with the tranny instead of the center diff? I'm looking to do the same, but really had my heart set on a center diff....Seemed to be a simpler, lighter way to go. It also frees up some room...

I may due to lack of funds have to use the tranny for now, but just wanted some thoughts on it.

Also I have followed your threads on RCU for a long time. Been running an MGT for 4 years maybe 5...Just breaking them out again after a layoff...

Thanks,
Scott

10kman · 02.02.2011, 10:27 PM

I used the stock tranny for a couple of reasons. I have never had an issue with them in terms of parts breakage, even on my last converted MGT that still used the 2-speed, ran fine.

The other, is that while a center diff seems simpler, I think the stock tranny is simpler, there's no custom parts or oddball things I need to track down in the event I break something. I also haven't seen a drop-in center diff, other than the other MGT thread going here, but the different center shafts, customized setup, doesn't appeal to me. I want to keep it easy to fix, and modular.

So, stock tranny locked in 2nd gear works for me.

Still haven't gotten it out to really thrash on it, I see Sunday looks dry finally, could be a good time to get some videos off the phone.

_paralyzed_ · 02.02.2011, 10:31 PM

MGT's are just plain tough trucks. I really don't understand why they aren't more popular.

Good looking conversion

_paralyzed_ · 02.03.2011, 10:24 AM

Quote:

Originally Posted by Scott_T

Good points 10K.....Is there a certain spur gear pitc I need to mesh with the clutch bell?

Cannot wait to see vids....

Thanks,
Scott

Its Mod1 pitch

E-Revonut · 02.03.2011, 12:15 PM

Quote:

Originally Posted by Scott_T

Hey 10K,

Any reason you stuck with the tranny instead of the center diff? I'm looking to do the same, but really had my heart set on a center diff....Seemed to be a simpler, lighter way to go. It also frees up some room...

I may due to lack of funds have to use the tranny for now, but just wanted some thoughts on it.

Also I have followed your threads on RCU for a long time. Been running an MGT for 4 years maybe 5...Just breaking them out again after a layoff...

Thanks,
Scott

A monster truck with a center diff is no longer a monster truck in my opinion

If your going over an obstacle and get hung up and only the back or only the front tires are on the ground a transmission will still send power to them a center diff won't. Center diffs are good for racing on a truggy, not bashing on a MT. Sorry, just my opinion

10kman · 02.03.2011, 12:47 PM

I agree about the center diff not being a great idea for general bashing. The handling is sorta turned into "race mode", and when you're out bashing and jumping, I just need the thing to hit the jumps and land smooth, no need to have a whole custom setup for that right?

There's enough room for the 4s pack I have strapped down. I would ideally like to run 2 packs on the side of the truck, but I'm just trying my hardest to avoid fabricating anything. Keepin' it simple.

Mod 1 pitch as well for your pinion choices.

simplechamp · 12:59 PM

Pretty cool. I like how simple it is (check out my username LOL). Swap the nitro motor for a Tekno mount, add some battery trays and done. No need to over complicate things. Another good thing about keeping the trans is that it provides the extra gear reduction an MT needs.

As far as the MGT not being more popular, I am surprised you don't see more of them. I guess AE seems to focus almost all their marketing today on their 1/8 racers and short course. I looked on the AE website and the MGT is not listed as discontinued or anything. It is strange whenever you see someone looking to get an MT they always look at LST, Savage, E-maxx, but the MGT rarely gets thrown into the hat.

EDIT: For battery trays I would suggest either 2 of the RC-Monster CRT.5 trays, or trays from the Ofna NEXX8 (check out my build thread for pics.) Both could be easily attached in a saddle-pack config with a few screws and minimal modification (just a few holes drilled.)

10kman · 02.03.2011, 01:08 PM

It's not drop-in easy for the battery trays, the chassis guards on the MGT, at least the one on the right side, has the steering servo mount in there. You'd have to hack it off to keep that in place, which was going to look bad and make it probably less rigid.

Luckily I already had the 4s2p pack, so it's fine, but if I was using the 2 packs out of my e-revo, I'd have to think about this more closely.

As soon as I got this thing out of the box, I was happy all over again. MGT's are so simple to work on, and they are just a true MT in my eyes. Not that a savage isn't, or a LST, the MGT just is my ONE truck that I really like.

AE is focused on the micro scene, and the SC stuff that is new and exciting. I still like the MT's, they are more fun for my type of bashing, but different strokes for different folks. I do wish they would at least get with the times and include a nicer radio with the RTR kits. I know it's simple and most people strip them out anyway, but it probably keeps people from even looking their way since it's FM, and everyone else advertises their fancy 2.4Ghz system. Noobs get wrapped up in specs, and I want the truck to stay around as long as possible, any help would be great!

Scott_T · 02.04.2011, 01:17 PM

Revonut....

Thanks, you just schooled me. I by no means know much at all about center diffs....What I thought, right or wrong I am not sure, was a center diff would be more bullet proof then a trans...Less to fail....Is that true? Also what about running really thick diff oil? Would that give more balanced power, although that may be defeating the purpose of the race readyness...

Thanks guys for schooling me. I know the MGT pretty well, but overall I am very limited in my overall RC knowledge. Especially on racing setups and vehicles outside of the MGT and nitro and the Stampede(all flavors).....Not exactly a newbie, but just limited in what I get to see by where I live.

Quote:

Originally Posted by E-Revonut

A monster truck with a center diff is no longer a monster truck in my opinion

If your going over an obstacle and get hung up and only the back or only the front tires are on the ground a transmission will still send power to them a center diff won't. Center diffs are good for racing on a truggy, not bashing on a MT. Sorry, just my opinion

E-Revonut · 02.04.2011, 02:53 PM

Heavy diff fluid (50k+) will help get equal power to all wheels but it's still not locked. A strong transmission such as one off the newer e-maxx trucks is just as durable as any center diff in my opinion.