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11-28-2021, 11:28 AM | #1 |
Newbie Join Date: Oct 2021 Location: San Francisco
Posts: 41
| Benefits of Gearing Down
I have a TRX4 Sport Kit. It has an 36.25 FDR out the box (39/17). My rig is currently at 9lbs. I have a HW 1080 ESc and a HH Crawlmaster Sport 12T motor. I run it on 3S with 4300mah LiPo. I get insane runtimes right now. My typical run is maybe 10 minutes of "trailing" to get to the rocks and then i can usually get an additional 60 minutes out of the pack (slow crawling- not dirt rooster tailing wheel spinning up the rocks). When the terrain requires more wheel speed than finesse my motor heats up after a bit (140-160 degrees) after a series of non-stop mixed crawling. I am never above walking speed except for the occasional "speed run" when trailing. Sorry - now the question... What's the difference between using my finger for throttle control with my current setup versus gearing down for SLOW CRAWLING (I have a 45T spur and a few pinions to get me in the 47 to 79 FDR range) besides slower top end = lower wheel speed ( i dont mind losing a bit off the top end on the trail but sometimes i think a bit of UMPF helps me get up obstacles). If electric motors have 100% available torque all the time, is gearing down just a finer motor control than i can do with my finger? |
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11-28-2021, 06:58 PM | #2 |
Quarry Creeper Join Date: Feb 2018 Location: East otis
Posts: 392
| Re: Benefits of Gearing Down
36 FDR seems high, especially for the weight.. Gearing it down will increase low speed control (like you suspected), increase drag brake, decrease motor temps, and increase run time( during crawling). I can get the same run time as you with a 1600mah battery on a 2.2 rig with about a 70 FDR. (But that's with a brushless motor, so more efficient than brushed). So I'd recommend gearing down. And if you can, try out a 4s battery to gain back the lost wheel speed. (You would need a different esc though, as I'm sure you are aware). Sent from my SM-G970U using Tapatalk |
11-28-2021, 08:14 PM | #3 |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: Benefits of Gearing Down
The only con to gearing down is the extra noise coming from the drivetrain. My truck with 76:1 / 110:1 (front/rear) final drive ratio is loud as ****. Crawls nice and slow with a 1600kv motor on 6s, though. https://youtu.be/YoXsIsADpLY |
11-28-2021, 11:38 PM | #4 | ||
Newbie Join Date: Oct 2021 Location: San Francisco
Posts: 41
| Re: Benefits of Gearing Down Quote:
Quote:
Anyways low speed control was much improved. I could lay into the trigger a little more and crawl in the meaty throttle zone a bit more if that makes sense. And true again- my motor ran much cooler after an hour and 40 minute session. My 4300mah pack was at 3.8v per cell when I finished. I still have an 11t pinion and a 9t pinion. Going to try to re-shim the shafts and slap jn the 11t pinion next. | ||
11-29-2021, 08:45 AM | #5 | |
Newbie Join Date: Oct 2021 Location: San Francisco
Posts: 41
| Re: Benefits of Gearing Down Quote:
Sent from my SM-G973U1 using Tapatalk | |
11-29-2021, 09:26 AM | #6 | |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: Benefits of Gearing Down Quote:
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11-30-2021, 07:54 AM | #7 | |
Newbie Join Date: Oct 2021 Location: San Francisco
Posts: 41
| Re: Benefits of Gearing Down Quote: I installed the 11t pinion last night and went out for a shakedown run. Modulation is even better with the 11t pinion but this is as high a gear ratio I'll go- no 9t pinion for me. Any slower top end and I won't be able to correct front flips when descending steep stuff. The motor after 1.5 hrs last night of mixed crawling the usual lines was at 98 degrees. It was a little cold out last night but that's a huge drop from the 160 degree I was at just a few nights ago with the stock 17/32. Sent from my SM-G973U1 using Tapatalk | |
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