Brushless Truggy Part 2

[jhautz]

Actually the CEN Matrix BUGGY uses 26/9 gears in the diffs. The truggy uses 38/11. Its still rather high for a truggy (actually very close to what most buggies use, 43/13) but not as bad as what you originally thought.

When I converted my CEN truggy I found the same thing. I started off with a very low KV motor to compensate for the tall gearing and 46T center gear. Eventually, I actually switched to the Hot Bodies 43/10 truggy dif ring and pinion to lower the ratio and allow the use of a 46T spur gear without a super small motor pinion. The HB ring gear and pinion fit the CEN difs with a little careful shimming to get the mesh right.


EDIT: What are you planning to use for chassis braces? The stock over the top braces dont look like they will work with your center dif arangement.

Here is a link to my CEN Matrix TR thread in case you are interested.
http://www.rc-monster.com/forum/show...ight=matrix+tr

[Shark413]

Hummm .. I have both (CEN buggy and truggy) and in my case the truggy has the 26/9T and the buggy has the 38/11T. Thats why the buggy uses a normal size spur and the truggy uses the ferriswheel spur. The teeth on the truggy ring gears are huge, probably why they could only fit 26 teeth on it. I have Kyosho ring/pinion gears and they fit on the CEN diff, so that may work (Kyosho ring/pinion with CEN diff). If that fails, I will stick the CEN buggy diffs in the truggy since the gearing is lower. And I am using a lower kv motor (Neu 1515 1Y). Regarding the brace, I saw someone else (may be you?) convert a CEN and they used spacers to match up the Kyosho diff mount to the CEN chassis brace. I have HB spiral pinions from another project, but the ring gears are gone (another project). Sounds like you have plenty of experience converting a CEN truggy, so keep the suggestions coming, while I am still in the planning/building stages.

[jhautz]

I'm not sure where you got your buggy and truggy from, but from the factory the Buggy comes with the 26/9 gears and the truggy comes with 38/11. Check your part numbers and manuals. The huge teeth you are talking about belong in the buggy and are mod1.5 pitch instead of the normal mod1 pitch gears.

Matrix Arena comes with MXS38 Steel Ring Bevel Gear-T38xM1
Matrix Buggy comes with MX040 Ring Bevel Gear d6(26T)

I have both as well and actually moved the CEN truggy difs (38/11) to the buggy and put the HB 43/10 gears in the truggy. That gives them both "normal" (or very close to it) gear ratios.

[Hakan_J]

Originally Posted by jhautz

I'm not sure where you got your buggy and truggy from, but from the factory the Buggy comes with the 26/9 gears and the truggy comes with 38/11. Check your part numbers and manuals. The huge teeth you are talking about belong in the buggy and are mod1.5 pitch instead of the normal mod1 pitch gears.

Matrix Arena comes with MXS38 Steel Ring Bevel Gear-T38xM1
Matrix Buggy comes with MX040 Ring Bevel Gear d6(26T)

I have both as well and actually moved the CEN truggy difs (38/11) to the buggy and put the HB 43/10 gears in the truggy. That gives them both "normal" (or very close to it) gear ratios.

I have noticed that the Factory Pro version of the buggy has different Bevel gears than the RTR version!

Edit:
Could be the source for this confusion....

[Shark413]

Update:
Girlfriend had to work Friday night so I had some extra time to work on the truggy. I made up servo mounts and a motor brace. I originally made motor braces to keep my Feigao endbells on. The Neu motors don't need them for that, but having the motor hanging by just two screws and putting a lot of leverage on the area were it mounts to the chassis, the brace really triangulates the brace and makes the mount rock solid. I also swapped out the 26/9 diff gears with 38/11 to give me a lower gear ratio. On the original Cen truggy the center diff mount has spacers to help it to clear the huge spur gear. On my conversion, since I was using a much smaller 46T spur, I just added spacers so the chassis braces would sit in there orignal positions.


The original CEN truggy had huge ring gears 26/9T (left) I swapped them out.


Here is the ferriswheel CEN spur next to the Kyosho 46T plastic spur.


Here are the center chassis brace spacers.


Motor brace


Brake and steering servos and mounts.

[Shark413]

Update:

Saturday night I put the finishing touches on the truggy. Finished the battery tray, rx mount, hooked up brake linkage, added the ESC, added UBEC, added antenna mount and put everything together.


Top view showing the finished truggy.


Shot with the body on.

[Shark413]

Update:

Sunday morning off to the track for some testing.


Cen brushless truggy next to my Kyosho ST-RR.