RR10 2-speed

[Cultus]

Originally Posted by High Angle Five

Hey guys I'm still doing all the research i can on the two speed trannys. Im running a HH 30T brushed setup in my bomber with 2s 20c batteries. Does anyone know the neighborhood speed gain i would get with adding the 2 speed tranny?

You will gain little or no speed with the 2 speed, what you are adding is a low gear giving slow speed control to faster brushless system. That shouldn't be needed at all on 30T brushed on 2S.

[maslin]

Or you can gear low gear to where you are now and high will go considerably faster. I believe the gears are 1.08:1 and 2:1.

Not going to be very nice for a slowish brushed motor though. Another option is to split down the middle, low gear will be lower than you are now, high gear will be higher.

[Rais28]

how would you control a 2 speed setup and an optional drag break switch for lo/hi? Guess one would need a a 4 channel radio and receiver for this and a ESC like the MMX that would allow this?

[Krawlerado]

Originally Posted by ratrod63

Here is a couple pics of the servo install.

What servo mount is that?

[Jboucher]

Comes with the Bomber kit if im not mistaken

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[Krawlerado]

I bought my bomber 2nd hand and installed the 2speed but now am dealing with mounting the servo to the stock skid/ intergy metal cage with no mount left on the skid.

[Jboucher]

Check out RC Recycler or a local shop, they might have the kit 2-speed components?

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[DavidH]

Originally Posted by Rais28

how would you control a 2 speed setup and an optional drag break switch for lo/hi? Guess one would need a a 4 channel radio and receiver for this and a ESC like the MMX that would allow this?

The shift servo and the Aux wire for the Mamba X can connect to the same channel, but you typically need a servo reverser.

Mamba Firmware V2.02

[angrchair]

Dito with binding issues.

I got mine installed. Assembly was a breeze. I set my end points on my servo but even still it is just binding up.

I really wish the shift fork rod didn't roll

I did t not have a good servo horn or linkage to use. I'm using what I could find locally. Some smaller rod ends and a traxxas servo saver. Horizontally the throw is straight but my linkage goes up from the trans to the horn a little and I think it's causing bind.

First I tried this, the traxxas servo saver, terrible angle, super bindy.



Then I tried this, a regular servo arm. Close but still binds without assistance.

[Antsiranean]

Originally Posted by raul shabinguez

I guess id have to drive a bomber with a 2 speed already in it, cause I don't understand the need for it. With a good brushless system it seems unnecessary.

I'm using a MMP pro4hd combo on 3S with stock gearing and its fast and can still creep very well. Id imagine if throttle control is a problem, then maybe a 2 speed would be worth it. Or if you are trying to get yeti track speeds. 20mph is fast enough for me....that's a guesstimate.

I have an Axial 2-speed in my Yeti and paired with a Mamba X, it is a great thing. I run a Tekin Pro 4HD, so it's all sensored. With the 2-speed coupled with the aux output on the ESC (as David H mentioned above) I have it setup so that when I engage 1st gear I have 100% drag brake and instant reverse, while in 2nd gear I have 30% drag brake and break - reverse on the tx. Full drag brake and instant reverse aids a lot in crawling situations, but when going fast I certainly don't want it - it would make the car roll over whenever I let go of the throttle.

So, with a good brushless system and a Mamba X, you get kind of a 2-in-1 driving experience. When I build a bomber within a couple of months, this will definitively go into it from the start.

[smokee]

One more thing on my list of things I want to do to my bomber.

[NitroDarwin]

Originally Posted by DavidH

The shift servo and the Aux wire for the Mamba X can connect to the same channel, but you typically need a servo reverser.

Mamba Firmware V2.02

So you could have high speed w/o drag brake and low w/ dragbrake? What about endpoints on servo? Really like this idea!

[DavidH]

Originally Posted by NitroDarwin

So you could have high speed w/o drag brake and low w/ dragbrake? What about endpoints on servo? Really like this idea!

It is a very cool feature, and really makes for a dual-purpose vehicle.

1 - You need to set the endpoints so that the esc engages the rr/crawler mode and the drag brake to your linking. The diagrams linked off of this page can help.

X-series Rock Race/Crawler Auxiliary Wire Mode

2 - connect the servo and adjust the servo horn, servo horn hole, and linkage length so that the transmission shifts properly. You may need a servo saver horn with additional holes closer to the axis, and a reverser module if your servo rotates opposite to what you need. There are reverser modules with integral y-harness for as little as US$10.

[Jboucher]

Can you put the 2-speed + AUX wire on a 2-position switch or clicky button?

Or does it have to be a dial type channel?

I can't see how this can shift the transmission and change mode at the same time...

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[NitroDarwin]

Originally Posted by Jboucher

Can you put the 2-speed + AUX wire on a 2-position switch or clicky button?

Or does it have to be a dial type channel?

I can't see how this can shift the transmission and change mode at the same time...

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You will want 2 postitons for buttons/switch and set up servo to shift between high and low and y harness the signal to esc that you set up that tells it what mode to be in

[Jboucher]

Someone needs to write a step by step guide for this...
I feel like a moron everytime someone tries to explain.

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[JT303]

I totally agree with the step by step.
I also need to find the part number for the 2 speed servo mount if anyone can help out!

[JT303]

Part #31323
Axial Racing - RR10 Electronics Box

[Jboucher]

Originally Posted by JT303

I totally agree with the step by step.
I also need to find the part number for the 2 speed servo mount if anyone can help out!

My solution so far is to avoid the damn 2-speed....

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[BroncoAZ]

Originally Posted by Jboucher

My solution so far is to avoid the damn 2-speed....

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Why avoid the 2 speed? It works great for me and allows a good range for crawling and top speed without spending money on a sensored brushless setup.