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05-18-2020, 10:05 AM | #1 |
Rock Stacker Join Date: Apr 2020 Location: Central PA
Posts: 61
| TRX-4 Sport Upgrade Path
Hi All, I wanted to get some thoughts on my planned upgrade path for my TRX-4 Sport. I'm still new to the hobby, and there are a lot of people here who've much more experience. I'll state right away that I wish I purchased a more powerful servo immediately. I made the mistake of trying some cheap servos that both broke within 1 week. Upgrade ideas in planned order of acquisition below. I'd love some feedback/recommendations on choices!
The truck is around 8.5lbs now RTR, which is I think around where I'd like to keep it. I have the new motor listed there because I've lost wheel speed with steel wheels and other added weight, and I want to get wheel speed back. I actually really liked the balance of the stock Titan motor on 3S when the truck was stock (and light), so I am looking to find that balance again with a slightly more powerful motor. I'd like to keep low-speed control as much as possible, obviously. I'm mostly crawling, but like to "pop" off of low ledges when needed/wanted and get some good pre-obstacle wheelspin when needed/wanted. Upgrades already installed or pending install:
Last edited by slothRC; 05-18-2020 at 04:11 PM. |
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05-18-2020, 10:14 AM | #2 |
I wanna be Dave Join Date: Jul 2005 Location: North Idaho
Posts: 3,647
| Re: TRX-4 Sport Upgrade Path
Sounds like a good path. If you are planning on running stock radio system, the RX is only rated to 6VDC. While some have reported running > 6VDC through their traxxas RX with success, most of us have fried them when we tried it. |
05-18-2020, 12:06 PM | #3 |
Rock Stacker Join Date: Apr 2020 Location: Central PA
Posts: 61
| Re: TRX-4 Sport Upgrade Path Whoops, sorry, I forgot to list the FlySky GT3B radio system. I just edited the original post to correct.
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05-18-2020, 12:44 PM | #4 |
Pebble Pounder Join Date: Nov 2009 Location: Newmanstown, PA
Posts: 174
| Re: TRX-4 Sport Upgrade Path
HH Trailmaster Sport 21T, HW 1080, and the Savox 1210SG are solid choices. I have the same set up. I was running it at 7.4V BEC, but I added the two-speed conversion kit and its stock servo can only run at 6V and I haven't replaced it with a third party micro servo yet. I'll be waiting for it to burn out. But I haven't found it to hurt the 1210SG's performance much. |
05-19-2020, 04:37 AM | #5 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: TRX-4 Sport Upgrade Path
Did you watch the YouTube trx4 series between Harley designs and scale builders guild? __________________________ Handy gearing spreadsheet |
05-19-2020, 05:03 AM | #6 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: TRX-4 Sport Upgrade Path
Holmes hobbies Brushless motors are best if you want a wide throttle range in a crawler. For brushed options I would buy a 2 speed trx4 trans from ebay. That 21t titan is as fast as I would recommend in brushed. Holmes 21t trailmaster is about the same, but it lasts longer because it has bearings not bushings. 4s is also an option. __________________________ Handy gearing spreadsheet |
05-19-2020, 06:11 AM | #7 | |
Rock Stacker Join Date: Apr 2020 Location: Central PA
Posts: 61
| Re: TRX-4 Sport Upgrade Path Quote:
I like the idea of both brushless and 4s, but they’re out of my price range considering the peripherally required components to run those. I’ve already exceeded my “cap”, and I’ve yet to purchase a very sorely needed $80-$100 servo (again, I wish this was the #1 upgrade I made) I have not, but I’m assuming you recommend? | |
05-19-2020, 11:31 AM | #8 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: TRX-4 Sport Upgrade Path
basically the weight of a tiny servo and 2 gears. Gearing works like this, the motor produces power, Power=torque*speed so if your first gear is half as fast as 2nd gear it produces twice as much torque, since the power remains constant. If you haven't purchased a radio, then I would cross that off the list and get a castle mamba x and a brushless puller pro instead. Nothing wrong with traxxas remotes. Extra buttons for lights...I have them, never use them, a button on the car is just as good IMO. Oh nm you already bought an ESC and the remote. :( Well you can run a brushed motor nn 4s for extra speed, but not with the HW1080. And 2200kv or a 21t 550 3slot or 10t 550 5slot are the only brushed motors I would recommend. |
05-20-2020, 09:39 AM | #9 | |
Rock Stacker Join Date: Apr 2020 Location: Central PA
Posts: 61
| Re: TRX-4 Sport Upgrade Path Quote:
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05-20-2020, 06:27 PM | #10 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: TRX-4 Sport Upgrade Path
Much faster then a 21t on 3s things get pretty unstable. Then you spend almost as much time going to put it back on its wheels as you do driving it. __________________________ Handy gearing spreadsheet |
05-20-2020, 08:35 PM | #11 | |
Rock Stacker Join Date: Apr 2020 Location: Central PA
Posts: 61
| Re: TRX-4 Sport Upgrade Path Quote:
Last edited by slothRC; 05-20-2020 at 08:40 PM. | |
05-22-2020, 10:45 PM | #12 | |
Newbie Join Date: May 2020 Location: Acton
Posts: 31
| Re: TRX-4 Sport Upgrade Path Quote:
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05-23-2020, 09:35 AM | #13 |
Quarry Creeper Join Date: May 2020 Location: Canada
Posts: 219
| Re: TRX-4 Sport Upgrade Path
Hey guys. I'm waiting for my sport kit to come in and am doing tons of research while i wait. Stumbled on this thread and its exactly what I've been debating. Is the 2 speed worth it or not? Can i just buy a couple gears and a servo and install them while im building the kit to have 2 speed right away or do i need a whole different transmission? Do you need to be able to unlock the diffs if you go 2 speed or is it fine to run it locked?
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05-23-2020, 06:49 PM | #14 | ||
Rock Stacker Join Date: Apr 2020 Location: Central PA
Posts: 61
| Re: TRX-4 Sport Upgrade Path Quote:
Quote:
About the locked diffs question... My understanding is that the Sport without the 2-speed is always in "high gear" (someone please correct me if I'm wrong). And, the Sport's differentials are always locked. I kind of don't see the point in wanting to run the differentials unlocked in a crawler. In the month that I've had my Sport, running it every day since I bought it, I never wished my differentials were unlocked. | ||
05-23-2020, 06:58 PM | #15 |
Pebble Pounder Join Date: Dec 2011 Location: On, canada
Posts: 171
| Re: TRX-4 Sport Upgrade Path
you want unlocked diffs if you plan on going much faster as your truck will spin one tire and be less flippy when turning quickly. Ms Allister, as far as I know the TRX4 a speed and 2 speed transmissions are different and you need to swap the whole assembly. You don't worry about the locked diffs, it's just a bit more unstable at higher speeds on hard surfaces. |
05-23-2020, 07:44 PM | #16 |
Quarry Creeper Join Date: May 2020 Location: Canada
Posts: 219
| Re: TRX-4 Sport Upgrade Path
Okay thanks guys! Haha, reading this post is amusing to me since i already own a slash 4x4 I'm looking to try a different area of rc that's more family friendly and as my kids are getting older we're doing a lot more hikes so naturally a crawler caught my eye. I have had quite a few rc's and they've all been fast offroad vehicles. Super excited to try crawling/trailing! |
05-24-2020, 07:43 AM | #17 |
Pebble Pounder Join Date: May 2020 Location: DMV
Posts: 132
| Re: TRX-4 Sport Upgrade Path
i had rc buggies back in the day, and always found them too fast/uncontrollable and unless i was at a trck, not much fun in the yard. i picked up a TRX4 and have been loving it. so has my 5 year old, so of course he needed his own!
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06-02-2020, 11:58 PM | #18 |
Newbie Join Date: Dec 2019 Location: Miami
Posts: 42
| Re: TRX-4 Sport Upgrade Path
TRX4 Sport & Rustler 4WD VXL make a nice combo IMO, I enjoy driving both a lot. I considered the 2spd gearbox but it's just something to break/cost $, the Sport goes a decent clip stock and still crawls OK. I was not interested in (un)locking diffs since its primary purpose is gnarly terrain. If I were to do another TRX I'd do a Sport (kit this time) again. Just my 2c in case anyone is on the fence.
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06-03-2020, 09:23 AM | #19 | |
Rock Stacker Join Date: Apr 2020 Location: Central PA
Posts: 61
| Re: TRX-4 Sport Upgrade Path Quote:
That’s pretty spot on to me. I’ve done a lot of thinking while running the truck lately and honestly, I think I want a slower motor with more torque and control. The speed my Sport has is fun, and the idea of a 2-speed transmission with remote lockers definitely seems very fun, but I’d rather have this be a dedicated full crawler. If I want something fast for the trails, I’ll build a different RC. 4WD “Monster” Slash seems up my alley for that sort of thing. I’m actually trying to do research and looking for some recommendations on a good quality, brushed motor in the $60 or less range for my Sport. As said, I want something slower and stronger with good control. Sent from my iPhone using Tapatalk | |
06-03-2020, 09:30 AM | #20 |
Quarry Creeper Join Date: May 2020 Location: Canada
Posts: 219
| Re: TRX-4 Sport Upgrade Path
The Holmes hobbies crawlmaster series are in that price range and I've only heard good things about them.
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