How I switched my crawler from Traxxas to Radiomaster MT12 w/ ExpressLRS 

Locking one diff as opposed to both at the same time is usually used to get around tight obstacles. Locking the front around turns will pivot around and hold a tighter turn where as the back locked tends to push and create a wider turn. Having the front only locked going up steep inclines can also keep the vehicle planted where as the rear locked can cause it to flip over backward.

Really enjoying the MT12 content. I did not even notice you said happy flying for a surface video until you pointed it out.

"SA" switch is a 3 position switch just below the steering wheel that will function the same as the original TQi remote. Save your toggles for lights!!! 😊

Nice video Joshua I'm so glad that You now have rc cars in your channel I've been building rc cars longer than I've been flying FPV.

Welcome to the surface radio controlled world. Good to see other companies selling nice radios for less $$ than futaba & spektrum. And anything is better than that stock traxxas "4" channel radio. Good to see your having fun. Might get me back onto my surface rc's again. Been a couple years.

This EXACTLY the video I asked for when, you posted the TRX transmitter vs. FPV transmission. I somehow ended up with a new TRX4 2021 Bronco about a week and a half ago. I already have my Sledge bound(thx to you) and now I will soon have my TRX4 on the MT12 and ELRS. I have so many projects in the works, I don’t know if I would have found the time to figure it out for awhile. I’m a long time patron, and thankful for your help as always!

I'm so happy you're doing RC car now too. I just started RC car so your going help a lot. Thank you Joshua

The land enthusiasts are very different than your air enthusiasts. There’s a lot of RCs abuse, trash talking, and egos in the land community. You’ll see. Lol. But thanks for these land videos with this radio. I’m just getting used to the programability of the Dumbo DDF-350 and then heard about this Radiomaster. I ordered the 4in1 and the Ranger module separately because I bought it more so for the multi model storing. I have a lot of Dumbo receivers and it’s great that this radio binds with them. I’m also about to setup my first fpv vehicle as soon as all the equipment delivers. I subbed!

Again thanks for being one step ahead of me 👍🏻 Personally I want the ability to lock each differential independently, as some situations require to unlock the rear and basically drag it in sticky situations, where you need to only be pulling from the front. Usually in technical crawling problems. Hard for me to explain, you would just have to watch some “TRX4 technical rock crawling” videos to really understand. This definitely gets me 85% there though. Will maybe use SC or SB for the low and high, and the two position switches for my lockers, which will actually give the truck an ability that it doesn’t have from the factory. The ability to lock only the rear. I sooo dig this transmitter. It’s the main reason I have over 2Gs in RC cars now, when I haven’t owned one in 25 years(tons of quads though)

Nice! I use an NB4 with all my vehicles including TRX4... great color touch screen menu also has almost endless programming like the TX16

Cant wait to see you get into rc, youll love the bashers and crawlerd for sure!

THanks man, informative video :) Got my MT12 Radio yesterday and I will start by binding it to a more simple car before going about and mess with the TRX-4 :)

I like having independent control over each diff. There are times when unlocking just the rear will keep the truck from pushing the front wheels off line.

Fantastic, Joshua! Thanks for the tutorial! 😃 Stay safe there with your family! 🖖😊

Hi Josh, I just purchased the Radiomaster MT12 and I can't wait to setup my rockcrawler. But I did something different. I installed a servo for I can use 4wheel steering, with a twist. I want front steering, rear steering, crab and together. For years I have been looking for a radio that I can do everything with, I found a couple of radio's but they were so expensive I had to pass. Can't wait for the next video on the Radiomaster MT12

A whole new flood of viewers coming. Nice bro❤

Great stuff JB!

Unlocking the steering axle will help tighten turns. A lot of buggies w/4wheel steer use all types of combinations to cut in or out power to each of the 4tires independently

Suggestion: Head-tracked "driver's head" gimbal-cam in the proper driver's position :)

Love the surface rc content i been flying quads for a few years just got into fpv surface rc cars its so much fun 😂

Locking the front diff and not locking the rear diff allows for better turning in most situations. The front end is "pulled" around by both front tires, and having the rear unlocked helps this a lot. Locking just the rear diff and not locking the front diff would make the truck "push" through turns and not handle as well, but it could make it "drift" better on slick surfaces. The settings make sense for what the truck was intended for.

U can store a ton of models on the one traxxas transmitter. And the Bluetooth module with the app is awesome😊

Sdtig148 explained it correctly. Just imagine when a race car takes off the front nose lifts up so is you lock the front diff only on your rc then the back wheel won’t pull the front nose more away from what the front tires are trying to grab friction from. You be pulling yourself up not pushing. Great Vid Joshua. Hope you open a whole new viewers. This is something new the ground rc is looking into. 👍

I love my TRX4 High Trail 72 blazer. It's a beautiful truck and it's super capable.

Well, I just got one ordered. Picked up an 8 channel receiver so I can install the selectable 2wd on my TRX-4 and control the diff locks individually. Might even see if my winch can run off the radio as well.

I'm running a radiomaster pocket ELRS tied to a 8ch beta FPV controller for land based. I never got into the wheel controllers (aka, I'm horrible with them). So, I just use the pocket because with a couple cranks of an allen wrench I have dual centering sticks on the fly. Currently working on a FPV lawnmower, using the 36v 350watt motors and drivers from 2 hoverboards. You'd be surprised what you can make RC with a simple PWN controller and a Granger warehouse down the street.....

I use my spektrum DX5 radio for all my basher RCs and my Axial SCX6 Trail Honcho. I only use the traxxas radio for my TRX4.

Currently waiting for the mt 12 for my fpv scx 24 setup, can’t wait!

Excellent content, as usual. I'm hoping that your new rc vehicle videos bring a whole new group of hobbyists to a different aspect of the hobby, and vice versa. Could you possibly make a video showing how to bind to Traxxas TSM or Flysky FS-BS4 receivers to gather telemetry data and modify the gyro? Thanks!

Since you’re going to have diffs on or diffs off, I think you could use a y cable and put both servos on one channel. Then you could use the other channel for lights or a winch.

Missed opportunity to show how to program in cruise control (locking throttle with a button, but also using brake to cancel, and the knob to fine tune cruise speed, and ALSO the trigger to momentarily increase cruise speed). It took me a while but I got to use global variables, a bunch of different logical switches and special functions, the “add after” mixer functions, I learned so much. I’m a nerd like JB so for me it was just fun to think about how I would use the available functions to solve a complex problem.

I love the rc surface content. You should snip that Traxxas battery plug off the esc and get out of their walled garden

This is a great video, I've been wanting to do this for a while and with this video the process will be a breeze. So I guess you don't need a laptop or a smartphone to connect the RX to wifi with a land RX

I would reccomend to use the bottom switches for Ch 4 and ch 5 seperatly, because you want to choose, which diff is locked and switch the gears by using SC at the handle

The ability to lock just the front diff is for some certain situations when you need to do precise maneuvers.

Few things holding me back from putting any of my traxxas vehicles on the TM12 missing from this video, I’ll definitely be putting my other cars on the TM12. 1. Do you lose TSM (stability management) the multifunction knob next to the steering knob? 2. I’m guessing you’ll lose the ability to update your esc and change the settings with no traxxas Bluetooth link? Not the end of the world tho 3. Is there a way to get the speed motor temp telemetry working without the traxxas Bluetooth link? Also you need to recalibrate the esc using a new TX you may lose resolution on throttle/steering, important step should be mentioned (hey whys my car so slow now 😂) Great vid for swapping your car over to the TM12, not sure it’s worth losing traxxas system just yet, TSM would be great to get that working and would almost be enough for me, motor temp and speed be great but I bet most don’t use the BT link anyway, can always update esc before you swap over.

Hey I have a question related to ELRS, would it be possible to turn a old transmitter into a sort of relay for boosting RSSI when flying/driving long distances or deep penetration in a building for filming purposes? I have seen something similar done for the Red Bull video but it wasn't really covered how they did it.

Great project! What would be involved in adding a rear-view camera (to check for cars overtaking)?

The front locks on its own to get around turns better since the front has more grip and switch all the way it does both for those real sticky situations lol u could do just the rear but it would spin out easy in the front and possibly making the rear slide out on u

I never got into RC cars but did have a few RC boats as a kid. Maybe become the RC Know-It-All! Tho i have to say no other RC hobby came close to holding my attention for as long as quadcopters

quick question for you, ive looked to see if you have covered this yet but i dont see it. ive been trying to take a channel on the erls receiver and make it switches for the lights on my cars. ive tried 2 diff. ways and i cant figure it out. any help would be great.

If you install the Bluetooth module in the TQi transmitter, you can use the transmitter with 40 cars. I have four Traxxas transmitters and just got a ELRS MT12 with 4 in 1 module and four additional receivers. Thank you for your videos.

there's a second antenna holder/spot just to the right of the receiver you can use.

joshua i have a traxxas 6533 rx in my high trail blazer. can i leave the rx the same and bind to my 4 in 1 module? that way i could still keep the traxxas pro light kit that plugs into the traxxas rx. i understand the diffs and hi and low gears but the light kit has a different harness that the 6533 rx accepts. i dont mind changing rxs as along as i can get lights to work also

I really appreciate all the stuff you do but I really wish you would do a series of videos on fpv wings and inav.

Hi Joshua, do you happen to have a complete video tutorial on how to set-up the MT12 with the TRX4 from scratch? I mean like from binding it. I am getting frustrated as i am not able to make it work lol i got the 4in1 version so i tried to bind it with the original Traxxas receiver but it doesnt seem to work and so i attempted to swap the receiver but the only thing working is the forward/reverse but its function as left and right. I followed the channel wire set up based from the original tqi rx. Please advise.

Great content!! 18:11 Do you know how to get full telemetry(volt,amp,rpm)with ExpressLRS and blheli32 single escs? It's possible with frsky receivers thru s.port but with ExpressLRS i dont understand if it's possible

We're you able to have it bind with the stock trx4 receiver? Just got the MT-12 under the impression it would bind with Traxxas receivers.

I went from cars to drones and back to cars. I know your a drone guy but look into an X-maxx next. You won't be disappointed.

Those traxxas ones are hard to remember to shut off, luckily the batteries tend to last, I am one of those guys with too many controllers, that’s why I’m switching to Elrs with the mt12 for my rc cars, now I just need to figure out how to put in a gyro so I can maintain traxxas stability management on the steering

I just purchased the Radiomaster MT12 surface radio. I’m trying to create a “launch control” function (for drag racing). I need to be able to adjust throttle percentage and the time it takes to clear that range, i.e. 0-30% throttle in .5 second. I would like to be able to create multiple stages like this, i.e. 0-30% in .5sec, 30-45% in .2sec, etc. I would like to have multiple stages (at least 8 possibly more). I would like to be able to toggle the stages off and on the fly i.e 2 stage launch or 8 stage launch or any option in between. I would also be looking to adjust the throttle percentage and stage time on the fly i.e. 0-30% in .5sec to 0-35% in .45sec on the fly. For ease of use I would like the maximum level of the previous stage to control the minimum level of the next stage, i.e. a 5% increase in stage 1 from 0-30% to 0-35% would make the minimum of stage 2 go from 30-45% to 35-45%. I got this radio because I love to tinker. I’m totally new to edgeTX but I’m excited to figure out how to utilize the software. I am not looking for someone to do all the hard work for me, just point me in the right direction. This would be like the seed control function in the Futaba 7PXR TIA

Upload the the range test asap! Been wanting to try this for some time

If you are rock crawling and you're trying to get up a ledge and one of your rear tires has more traction than the front, a rear locker will flip ypu over backwards. With just the front locked it can pull up without flipping over.

Does this rc allow mount external crsf-protocol module? Betafpv introduced elrs series 'super' with gemini mode (2 antennas with different frequency instead of one frequency that we used to with simple divercity) and it worked for me wery good on the earth. Have you tried it? Btw, my car with betafpv superP + radiomaster pocket drived 450m (until av lost) on flat surface with no obstacles and Icve still got 90lq

I like my MT12 but I've put it away until EdgeTX Companion supports it. I've always found the best thing about OpenTX/EdgeTX was setting up & testing complex models in companion.

Don’t forget the cruise control feature from the Traxxas radio.

Joshua; is there a way to get sound? I have the walksnail and no sound on that system. Wondering if there are alternitive ways without replacing that system. Or is DJI going to be the only way. If so what DJI system is available. Surface FPV maybe a bit bigger than you might think now that there are digital plug and play systems out. These system are fairly new and more and more surface users are adopting it now. Scale detail in crawlers is HUGE and it dont get anymore scale than putting yourself in the drivers seat.

Hello, I noticed you didn't set the epa on the servos. Why is that? Do the end point automatically set?

hey joshua. great videos. i am thinking of buying the mt12 but dont know which version. i have about 4 different vehicles now and want to get them on 1 radio qnd they have different rxs. i also want to use the eslr rxs for future vehicles. i was thinking of getting the 4 in 1 radio and adding the external elsr module. that would give me the best of both worlds i think.what are your thoughts?

I sold my trx4 (landrover defence) on new years eve to fund my gradual swap over to digital gear

Great RM have made a surface radio, there’s two choices elrs or the 4in1 which one do you choose? I run ghost in my air crafts and obviously if your going to fpv your car which not many will do is there really an advantage going elrs or would the 4in 1 be better seen as it binds to a lot of rtr cars available? Pros n cons?

You lock the front only for tight turns or digging on a hill. Locking the rear severely reduces the turning radius. Locking both is max traction

any one know if they added a three position switch?

Hey Joshua👋🏻 Im looking forward to get the Getfpv DIY Kit freestyle Drone Kit from you for my birthday and i wanted to buy the NewBee Toolkit. Should i get a “better” Soldering iron or something like that or do i have everything i need in that Kit? And do NewBee Drone and GetFPV ship to Europe?

Let's FPV a boat and ELRS

Joshua, during binding: Can I use a 1s battery with JST connector, connecting it to port 2 on the ELRS RX to cycle three times to start the bind?

That Traxxas looks awesome. Too bad it is so expensive 😢

Doesn't the radio have a 3 position switch? Pretty sure SA would do what you wanted to emulate the diff lock switch.

Can you make at32 video more detail with beta flight?

Hey can you bind a 280explorer long range drone to a at9s pro remote

What about correctly setting steering, throttle and servo endpoints? That would seem to be important!

Need help I have one speed boat and it flips upside down and I have a recovery boat to go get the speed boat. How do I switch between the receivers?

Just an observation. The model template you are using is still using the default and incorrect channel order of Throttle on Ch1 and Steering on Ch2 (10:00 in this video) but when moving the plugs across to the new ELRS RX you state that you follow the Traxxas order which puts Steering in Ch1 and Throttle in Ch2. There is no way that will work and is bound to cause confusion for those new to EdgeTX and this radio. This has the potential to get even more confusing when more complicated mixes are developed as some users (like me) will have amended the channel order at the outset and some won't. Other content creators will add to the confusion as some will have the correct channel order and others won't. Perhaps we need a caveat at the start of each video stating the channel order used?

added the 2 position switches, but they are not working. When I go to the "debug" settings the switch positions do not change. FL2 does not even show up. Thank you so much for your videos!

Hey Joshua, there’s a guy on RU-vid and his name is Kevin Talbot. He’s the number one RU-vidr in radio control in the entire world. Follow his method, and you’ll be a rich man!

Always thought JB was a crawler than a fly by type guy.

Love your videos, but you're missing a lot of very important info. On quads with flight controllers we dont worry about sub trim and endpoints and such as much. Proper servo setup with PWM is vital or people are going to be burning out their gear in no time.

Will ER5C V2 work with TX16S?

No concerns about the weirdo Channel 5 thing that ELRS does? I moved my second diff to Channel 6 and then in the ELRS settings had the receiver output channel 6 on pin 5. That way I could leave channel 5 high, which supposedly brings the ELRS module to full features?

Yooo he got a traxxas lesgo

Guys I had burned one of the chips of my FC, its was a F4 vs3 plus, I wanna understand what I did wrong, or happened, some one can help me?

Stick a fusion se 1800kv in that beast and you will have Uber smooth throttle response..direct power 12v servo to..rc crawling isn't ousted just yet..

First ditch the brush motor and use hobby wing fusion pro pnp.

Day 1 of asking we’re the products roundup are

Easy way to remember turning and throttle channels for unewbies out there, 1 to turn and 2 to burn lol

You better not guilt trip me into a patreon sub this episode bardwell id like to see you just list the good things patreon members get

Why such great things are so difficult to get? Eu market is trash…

just lock your difs and try do make a tight corner... it wont work, because the outer weels in the curve make more revelution than the inner ones. because of the diffrent radius of the left and right wheel

I've been wondering what the Open Tx Edge Tx god would do after the NAZIS at the FAA bans radio control flight. 23:43

Traxxas has 30 memory

Tires turn it different speeds on an axle as you go around a corner. When you lock the diff, it makes both tires spin exactly the same speed, even when going around a corner which can make you hop and not turn as tightly. Same goes for the back, your outer tire on a turn is always spinning faster than your turning tire

Stick a fusion se 1800kv in that beast and you will have Uber smooth throttle response..direct power 12v servo to..rc crawling isn't ousted just yet..