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05-14-2019, 07:37 PM | #1 |
Rock Stacker Join Date: Dec 2013 Location: Windsor
Posts: 74
| TRX 4 Sport Geared for Slow Crawling ?
I was thinking of picking up a sport , I have an scx10 , but have not had a portal truck before , I have seen " box stock" videos that appear to show it doing slow crawls , & others that looked quite jerky , Can this thing do slow controlled crawls out of the box ? or no ? On my scx10 I just dropped down a few pinion sizes & it has real nice slow speed control ,..How would I achieve the same thing on a sport ? Im not sure how much the portal gearing figures in to it
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05-15-2019, 09:54 AM | #2 |
Newbie Join Date: May 2019 Location: New York
Posts: 36
| Re: TRX 4 Sport Geared for Slow Crawling ?
The Sport does not have the two speed drive so it is geared to go a bit faster. The others with the two speed are geared lower/higher so they can go slower and faster than the sport in each mode. What you may be seeing is a two speed in low vs a sport. Or maybe a sport with modified gearing. Or a good drive and a bad driver. Or different conditions. You get the idea. Any of those could mean more jerky low speed. Gear rations of the two systems out of the box are: Sport: gear ratio of 36.25 2 speed TRX-4 High: gear ratio of 25.85 2 speed TRX-4 Low: gear ratio of 64.64 You can change the spur/pinion to get similar gearing and low speed performance, but lose top end of course. |
05-15-2019, 11:46 AM | #3 |
I wanna be Dave Join Date: Sep 2011 Location: Douglassville, PA
Posts: 4,218
| Re: TRX 4 Sport Geared for Slow Crawling ?
Same as your SCX10. Drop a few teeth on the pinion and it should be down about where you want want it. It's geared a little bit high out of the box in my opinion. I like my crawlers to be slow and steady, so I picked up the 45 tooth spur gear as well. Currently running 9/45 and I'm very happy with it |
05-15-2019, 03:52 PM | #4 |
Rock Stacker Join Date: Apr 2019 Location: Canterbury, NH
Posts: 68
| Re: TRX 4 Sport Geared for Slow Crawling ?
I believe the Sport's ESC has a training mode. If so, that would slow it down...
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05-15-2019, 05:18 PM | #5 | |
RCC Addict Join Date: Aug 2017 Location: Fredericksburg, VA
Posts: 1,912
| Re: TRX 4 Sport Geared for Slow Crawling ? Quote:
No that won't slow it down. The training mode just limits throttle to 50% max which you can also do manually with a little throttle control. Changing the Sport spur gear and pinion to 9/45 gears used with the 2 speed is the best method of slowing the truck while also allowing the motor to run cooler. Next I would ditch the stock XL5 ESC and install an HW1080 which actually works well with the stock Titan 550 21T motor. Finally, if you want to spend the money, I would install a HH Crawlmaster Pro 550 12T 5 pole motor. If you want low speed crawling but still want some speed then you can buy a 2 speed transmission off ebay for around $35. Last edited by Inspector86; 08-06-2019 at 10:31 PM. | |
05-15-2019, 05:46 PM | #6 |
Quarry Creeper Join Date: Dec 2012 Location: okc
Posts: 251
| Re: TRX 4 Sport Geared for Slow Crawling ?
A 9t pinion and a 45t spur both traxxas parts and my truck is the perfect speed. both 32 pitch
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05-15-2019, 08:08 PM | #7 |
Rock Stacker Join Date: Dec 2013 Location: Windsor
Posts: 74
| Re: TRX 4 Sport Geared for Slow Crawling ?
So the 9 /45 gear combo would give good slow speed crawl control & how fast would the top end be ? I just want it about walking speed max ,.and really good low speed control , Im trying to make a parts list & slowly sneak in all the parts , before I get another truck , that way once I get the truck , I will already have all I need to make it the way I want before my wife can freeze the account , Its my first portal truck , but not my first truck |
05-23-2019, 11:28 AM | #8 |
Rock Stacker Join Date: Apr 2019 Location: Reno, NV
Posts: 86
| Re: TRX 4 Sport Geared for Slow Crawling ?
Other ways to get the TRX4 Sport set for slow crawling... - Higher turn brushed motor. Go from the stock 21 turn to 27 turn or higher. - Five pole brushed motor. Holmes Hobbies has some interesting motor options. And there is the new Reedy Radon 16T Crawler motor. - Using a Hobbywing 1080 ESC can give you more adjustability via its fifteen adjustable settings. Having both the Sport RTR and Sport Kit, I highly recommend going the Kit route and installing your own electronics. Was a fun build too. Last edited by Still Bill; 05-23-2019 at 11:35 AM. |
05-23-2019, 07:21 PM | #9 | |
Quarry Creeper Join Date: Nov 2018 Location: Oakley
Posts: 479
| Re: TRX 4 Sport Geared for Slow Crawling ? Quote:
The kit was great and the HW1080 and Holmes Trailmaster sport combo only set me back ~$60. | |
05-24-2019, 11:25 AM | #10 |
I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew.
Posts: 7,843
| Re: TRX 4 Sport Geared for Slow Crawling ?
I agree , Traxxas 9/45 spur and pinion gears delivers a great crawling speed and torque.
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06-09-2019, 09:09 PM | #11 |
Newbie Join Date: Sep 2008 Location: Grand Cayman
Posts: 14
| Re: TRX 4 Sport Geared for Slow Crawling ?
I agree with the above. Running the HW 1080 and HH Trailmaster 27t geared 9 45. It is not brushless fast but faster than I can keep up with at a brisk walking pace. The low-speed control and torque of that setup are great. I got around 45mins of runtime and still had 50% capacity left on a 3s 2200mah pack.
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08-06-2019, 02:33 AM | #12 |
Newbie Join Date: Jun 2019 Location: Cali
Posts: 49
| Re: TRX 4 Sport Geared for Slow Crawling ?
Did you have any problems with getting the esc wire to rx box? I couldn't seem to make it work..I had to reverse that box and double side tape it.
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