they are just foams to keep the oil from bubbling. I would leave them in.

Ok, thanks for the info. Btw Welcome back :smile:

No problem,and thanks:yipi:

ok how much for a set of those mounts! dude i want to get runnin!

is mike working on a set of these yet or a diffrent set up? anyone talk to him lately?

Any progress? I tried to make something for mine but didn't have much success. I stripped teeth off of two spur gears. So back to the drawing board I guess. I had a little too much movement in the spur gear, when the gears hooked up it was wicked fast though. It wheelied right over on its lid.

Haha, maybe I could sell some of them. You need to do some work to get them installed though..


I dunno, haven't been in touch with Mike. I don't want to ply these mounts to Mike, if he is interested im sure he will contact to me.. But like I said Im quite sure that Mike isn't interested about doing mounts for gen/nem/gst trucks. Sales would be kinda marginal.. Or what do you guys think?


Have been quite busy lately and I have some hospital visits this week so we'll see when I can continue this. Hopefully end of this week. I have all necessary tools now (drill bits and m4 tap) so what I need is time :mdr:

Well mine is alive, but I'm not so sure I like the noise coming from the gears upon acceleration from a dead stop. It quiets down once moving but it makes a heck of a lot of noise when starting. I checked the gear mesh and all seams well. I used a piece of of packaging board, the type used at the top of the bags your small parts come in to set the mesh.

here are some pics of the setup

Nice work 93firebird. Yeah metal spur and pinion will be a little noisy. Are you running 6s with 2200 kv? What center diff?

Are you sure that your system isn't cogging at the startup? It would explain the rough noise.

Sry guys, have to admit that my projects haven't gone any further. Still looking some extra time. Since now weather has cleared up in here cold cold Finland my other hobby has started to taking my little time :cry:


There's my DH bicycle :love:

Attachment 6806

I took the truck to my LHS and they said the noise was normal cogging. So I am running with it. I am using a 4s 4000mah lipo for now. the diff is the center diff from the stock genesis tranny with the mxs24 which I think is from the matrix. It's a cnc steel gear with 46t. I am now running a 21t pinion instead of the 19t which seems to have helped with the cogging noise a little. I had to use a die grinder and notch the motor shaft as I couldnt seem to hold on to the pinion gear, it kept flying off even with lock tight. My mounts don't look the greatest but they are functional. Not bad for a saws all and die grinder. Maybe some day my wife will let me get a miter box with a cutoff wheel on it and the cuts can be a little straighter.

mike!!!!!!!!!!! make me some real mounts!

Well my Genesis cooked my MMM, I don't know if it was too much gearing or what. I was using a 19t pinion on a 46t spur and a 4s lipo it went up in flames and melted the case as well as one of the motor connectors on the esc.

What motor did you run? With that setup you should use something like 1100kv motor and still got speed up to 50mph. Very tall gearing imo.
Remember that the Gens diff ratios are pretty tall 26/9 so no need to gear high from the pinion, because the diffs are doing it.

I was using the neu-castle 2200kv motor that came with the speed controller

Ok. Sorry for your loss. Send it back to castle. they'll hook you up. Dunno if it goes to warranty though.. Next time use much smaller pinion, start like 10T. Did you check temps from the motor and batterys?

it happened on the third run, I checked on the first two runs. The third one it never moved.

I guess you had quite some cogging, next time don't run if it coggs. The motor tries to take too much from the system and the esc won't handle it..

Well I got an email from castle today. It looks like they are sending me a new unit to replace my cooked one. Now I need to know what size gear to use on the motor to keep this from happening again. My LHS has the hardened steel starting with 11 tooth. I would like to top out around 40-45 or so if possible. I am only running a 4s lipo right now but I would like to upgrade to two 3s in series in the very near future.

So your setup is something like this now?

Differential Ratio: 2.888888888888889
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 11
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 7.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 4.18 : 1
Total Ratio: 12.08081 : 1
Tire Circumference (inches): 23.56 inches (598.47 mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 60.14 mph (96.6 km/h)
Effective KV Value: 2200

That is too much for heavy truck imo, sucks a lot of current with 4s. Dunno really what you should do, since you have bought the 2200kv motor. Your options would be using smaller kv motor, get bigger spur or smaller tires. With pinion you really can't go any smaller 11t is quite small already, maybe you can find something like 9t hardened?
I would try first smaller tires with 9t pinion. Just play with Briang's calculator and aim the speed around 40-45mph. And test it out, watch temps very often. Hope this helps..

I would ditch the 7"+ tires and go with a truggy style 5"+ which will bring this set up to a more friendly 43mph+.

Any idea what the matrix tr tire size is. I'm having a hard time finding info on them. I'm not quite sure about using a tire that is so much smaller, this is a really big truck and I don't think it will handle well if the tires are too small. I found the 66t spur on ebay, for 25 shipped so I ordered that and may just go back to the drawing board on my mount that I made. I may be able to work with it and make it a little more adjustable. I'm also wondering if I run the center diff gears instead of the locker if that would take a little stress off the motor.