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08-21-2011, 10:44 AM
| #1 |
| Rock Stacker Join Date: Jun 2011 Location: Coquitlam
Posts: 58
|  BEC between tekin FXR and servo on 3cell
Forgive me if this is a dumb one.... Do I need to wire up a BEC between my Tekin FX-R and my mg645 servo while running a 3cell 2200MAH 30c lipo>?
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08-21-2011, 10:46 AM
| #2 |
| MODERATOR™   Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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This should help: Yes you need an external bec |
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08-21-2011, 11:26 AM
| #3 | |
| Quarry Creeper Join Date: Feb 2011 Location: Austin
Posts: 414
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Do you need one? No. Quote:
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08-21-2011, 12:09 PM
| #4 | |
| RCC Addict Join Date: Oct 2007 Location: gervais
Posts: 1,715
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08-21-2011, 02:17 PM
| #5 |
| Rock Stacker Join Date: Jun 2011 Location: Coquitlam
Posts: 58
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Thanks for the direction guys Elliott |
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08-21-2011, 04:06 PM
| #6 | |
| Quarry Creeper Join Date: Feb 2011 Location: Austin
Posts: 414
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Just read up on it and didn't realize how poorly the FXR handled 3S. Glad I have a BRXL. No BEC needed on 3S  Quote:
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08-21-2011, 04:39 PM
| #7 | |
| Rock Crawler Join Date: May 2010 Location: CRAWlORADO
Posts: 950
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08-21-2011, 07:23 PM
| #8 | |
| RCC Addict Join Date: Oct 2007 Location: gervais
Posts: 1,715
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08-21-2011, 08:52 PM
| #9 | |
| Quarry Creeper Join Date: Feb 2011 Location: Austin
Posts: 414
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If it has a built in BEC and it can handle 3S, neither of which are specific to crawling, then it should be able to do both simultaneously unless the limitation is stated by the manufacturer. If it can't, then it's a poor product design, but that's not to say it's a bad product. Quote:
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08-21-2011, 11:50 PM
| #10 | |
| Rock Crawler Join Date: May 2010 Location: CRAWlORADO
Posts: 950
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08-22-2011, 07:33 AM
| #11 |
| RCC Addict Join Date: May 2008 Location: Chicago/Bloomington
Posts: 1,505
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There's nothing wrong with running a FXR without an external BEC as long as you are satisfied with 6V and 3A output to the servo at 2S. Go to a 3S and the amps drop a bit so if the servo is very power hungry it may brown out the system, very possible with the enormous power outputs of these monster servos. An external BEC like the CC allows you to adjust the voltage going to the servo so you can feed it the 7.4V you want and maintain 3 to 5 amps. Also using an external BEC helps keep the ESC cooler since it is no longer supplying current to the servo. |
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08-22-2011, 08:06 AM
| #12 | |
| Quarry Creeper Join Date: Feb 2011 Location: Austin
Posts: 414
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Never said is wasn't a good product. I just don't like when manufacturers of any product advertise one thing and deliver another and that is why I run a BRXL. Almost the same price with more upside, unless you need a smaller ESC. And I do understand that some rigs still need a BEC, even with a BRXL.  Quote:
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08-22-2011, 09:04 AM
| #13 | |
| I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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Then the crawler guys showed up and wanted a ton more steering torque, this put it outside what the FXR was designed for. Why not chastize the crawler guys for using a ESC outside of what it was designed for??   PS, I never had a need for an external BEC until I started crawling..... | |
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08-22-2011, 10:57 AM
| #14 | |
| Quarry Creeper Join Date: Feb 2011 Location: Austin
Posts: 414
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According to Tekin, the FXR is currently designed for crawlers: The FX-R reversing speed controller leads the industry in pure rock crawling performance. With its tiny footprint, improved drag brake resolution with lock-down holding power, adjustable reverse type with reverse delay, no reverse or instant reverse, ultra smooth low speed creep and precision throttle and braking response, the FX-R easily gives you the edge over the competition. There is just a lot of mis-information that gets thrown around this forum, BEC, brushless and aluminum parts being some of the biggest culprits. A lot of suggestions come from people who comp and those over-equip their rigs in some cases. With 50k members, that is going to happen though.... Quote:
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08-22-2011, 11:13 AM
| #15 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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The FXR was originally designed as a RTR vehicle ESC replacement. As far as I know the only difference from that design is in the software, and that was more or less an afterthought.
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08-22-2011, 12:09 PM
| #16 | |
| I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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The only major change in the ESC is firmware to address shortcomings identified as time went on as far as I know or can link. There were very few standard sized hi-torque servos back then as well, those that were around cost a ton of money. They are still a bit pricey, but not as bad. Crawlers were still very new back then, things change over time. If they didn't, everyone would still think Clods running Mashers were great. Remember, this whole part of the thread is "why did Tekin release a ESC with a crappy BEC"....just saying...... | |
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08-22-2011, 12:21 PM
| #17 |
| RCC Addict Join Date: May 2008 Location: Chicago/Bloomington
Posts: 1,505
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I was using an FX in my TC in 2006 when chassis started to become very narrow. So they have been around but unlike others you were able to upgrade the firmware via the Hotlink. I'm still using it after five years and two firware upgrades but not in a crawler (no reverse). Now remember that Tekin does advertise that it is Crawler friendly WITH a 35 turn or higher motor on 3S. Used with a 55 turn motor you can power that 333oz/in Hitec without a BEC at 6V. |
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08-23-2011, 09:13 AM
| #18 |
| RCC Addict  Join Date: Feb 2008 Location: Tekin, ID
Posts: 1,940
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I ran BECs on my crawlers with the FXR. Why? It took the load off the ESC and it ran cooler, which translates into the ESC lasting longer. As said above, the FXR was originally designed for brushed offroad and onroad cars, sportsman stuff and it was great for that. Then this awesome guy named Kaetwo stumbled upon it and well, here we are now. We made significant changes to the firmware to accomodate the crawler market and we made the changes with feedback coming from top level drivers. We knew the BEC wasn't the best for crawling, but putting in a switching BEC makes the ESC bigger. One of the great things about this controller is its super small size, mount it wherever you want. We make electronics. The FXR is almost 4 years old. The crawler market has exploded in size. Think about it. |
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08-23-2011, 09:28 AM
| #19 |
| RCC Addict Join Date: Oct 2007 Location: gervais
Posts: 1,715
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Charlie-lll and Ty@tekin, very well said. Slaughter- next time you might want to use some sense as to age of a product and knowing this hobby is different from others, read up next time because its pretty stupid to bash a product that's been around so kong and worked so well |
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08-23-2011, 09:47 AM
| #20 | |
| I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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Not trying to bash anyone, just trying to make sure "Internet mis-information" does not get spread around. | |
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