HW1080+Promodeler 470... BEC necessary???

[AnimalHippie]

I am about to order a Promodeler 470 servo for my Trx-4. I have a HW1080 ESC installed. Do I need To get a BEC to operate my servo correctly? I know I can run 6 or 7.4 out of the ESC. I just didn't know if I would fry my micro servos by turning up the ESC to 7.4 or if the servo would run better from an external BEC. Any help & knowledge is much appreciated. Have a great day!

 

[Crawler Cads]

BEC and a bypass cable thing for that servo and crank it up to the full 8.4v[emoji106] at least that's what I do on a Scx10 and Bomber.

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[AnimalHippie]

Since I haven't really looked into a external BEC. What do I need to be looking for? What's your suggestions on a good one that I won't have to many issues with? Does a external BEC have to be programmed or is it a plug & play thing? Sorry for the noob questions. I am still a noob to the RC world.

 

[durok]

You can get the HeyOK No-Brainer BEC (no soldering!):

https://www.rpphobby.com/product_p/heynbradj.htm

Or the commonly-used Castle Creations BEC:

https://www.rpphobby.com/product_p/cse010-0154-00.htm

Or the fancy waterproofed Castle Creations 2.0 BEC:

https://www.rpphobby.com/product_p/cse010-0153-00.htm

Some adjustments are needed, but are not hard to do...

However, I have read of someone who is using a ProModeler without a BEC on the HW 1080, as it does put out 7.4v and 3A of power, typically enough to deal with 1.9" tires...

 

[Teng]

I would say BEC is a bonus for your hungry servo. You need at least 8.4 to get all the torque out"thumbsup"

 

[JatoTheRipper]

The 1080 will power a Promodeler servo without any issues. I have read the micro servos are only rated for 6.0V though so if you want to run more through the servo you will need a BEC. A rare case of when a BEC is needed.

 

[Jim85IROC]

You can get the HeyOK No-Brainer BEC (no soldering!):

https://www.rpphobby.com/product_p/heynbradj.htm

Or the commonly-used Castle Creations BEC:

https://www.rpphobby.com/product_p/cse010-0154-00.htm

Or the fancy waterproofed Castle Creations 2.0 BEC:

https://www.rpphobby.com/product_p/cse010-0153-00.htm

Some adjustments are needed, but are not hard to do...

However, I have read of someone who is using a ProModeler without a BEC on the HW 1080, as it does put out 7.4v and 3A of power, typically enough to deal with 1.9" tires...

I think a 470 will do just fine at 7.4v on 1.9s. I run my 470 at 8.0V in my Bomber with 2.2 Rock Beasts and it's fantastic.

 

[AnimalHippie]

Thank you guys! That definitely cleared it up for me. I know I'd see a big difference just running the 470 @ 6v over my power hd, but why have a bad ass servo & not run it's full potential? I think I'd want to go with the HeyOK just to help one of our forum brothers push his product. Do you know if it's water proof? Can you Order it with the xt60 plug instead of the dean's? Thank you guys again!

 

[durok]

I think a 470 will do just fine at 7.4v on 1.9s. I run my 470 at 8.0V in my Bomber with 2.2 Rock Beasts and it's fantastic.

If you go by quoted specs from ProModeler's site, it still gives 440oz-in at 7.4v - and pulls 2.9A at stall torque, under the 3A given by a HW 1080ESC.

So, on a "normal" crawler, all would be OK.


The problem is with the TRX-4's other electronics... :shock:

Jato reminded me of that with his post - for various reasons the TRX-4 hates having electronics swapped out without attention paid to certain things because it has steering, shifting, AND two diff-locking/unlocking servos...

... and they are rated at different voltages than what you'd send to a ProModeler.

 

[durok]

Thank you guys! That definitely cleared it up for me. I know I'd see a big difference just running the 470 @ 6v over my power hd, but why have a bad ass servo & not run it's full potential? I think I'd want to go with the HeyOK just to help one of our forum brothers push his product. Do you know if it's water proof? Can you Order it with the xt60 plug instead of the dean's? Thank you guys again!

Just contact HeyOK - he'll customize it as you like, no worries!

https://www.freewebstore.org/HeyOK-Performance

"thumbsup"

 

[AnimalHippie]

I'll probably run it at the 6v till I can get the clearance on another $40 after buying a $100 servo budget is everything. Lmao! After all said & done for $10 more I could be running a savox 2290, but I think that's a bit of over kill & I don't want to start breaking other stuff cause my steering is so strong

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[high plains drifter]

Not sure if you're firm on the PM470 but for $118 you could throw a HH SHV500v2 without the need for a BEC. I run one in both my TRX4's and couldn't be happier. They perform flawlessly, are completely quiet, and pull 450 oz/ .10 sec at 11.1vt. I know you've done your homework on this so not trying to muddy things up... just wanted to throw it out there.

 

[durok]

Not sure if you're firm on the PM470 but for $118 you could throw a HH SHV500v2 without the need for a BEC. I run one in both my TRX4's and couldn't be happier. They perform flawlessly, are completely quiet, and pull 450 oz/ .10 sec at 11.1vt. I know you've done your homework on this so not trying to muddy things up... just wanted to throw it out there.

Just remember that you need to install a power tap from the 3S LiPo pack either by soldering a pigtail from your ESC power cables, or get one of the two types of pre-made connectors -

GearHead RC makes one that comes off a XT60 connector, but the attached JST connector is the wrong gender (I found this out the hard way, and had to cut it off, and while I was at it upgraded to XT30 connectors):

https://www.rpphobby.com/product_p/gea1417.htm

And 3Brother's RC makes another that comes off the balance port of a 3S LiPo that seems to use the right gender of the JST connector:

https://www.3brothersrc.com/product-page/no-solder-servo-and-accessory-connector-3s

 

[high plains drifter]

Thank you, durok for adding that additional info! "thumbsup"

 

[AnimalHippie]

Not set on the promodeler. Just a good guy at a local company his shop is about 50 miles from me. Have heard allot of good about his servos. There's so many options that I had to just tell myself to stop & pick one. One day here soon I'll just make myself buy one. Ok let's see if I have this correct. If I go with the 470 I need to get a heyok bec & a xt60 splitter to run at the 8.4v to get 470torque. If I go with the hh500v2 $99 if I want to run it at 7.4 450torque or 8.4 500torque I'd have to get the bec & splitter still because of the micro servos. Ann I thinking correct or did I miss some thing?

 

[mikemcE]

Looks right to me.
I’ve owned both the Holmes and the Pro Modeler (420 &470) the PM is far better IMHO. I ate 3 Holmes , JRH warranted them (1v1 and 2v2) ate the gears, look at the difference. Both John’s are first class people selling first class products with fantastic CS from both.

So which way to go ? I just built a VS4 10, you can see my PM 420’s scratched bottom in it !!

Hang up and Drive

 

[Natedog]

The 1080 will power a Promodeler servo without any issues. I have read the micro servos are only rated for 6.0V though so if you want to run more through the servo you will need a BEC. A rare case of when a BEC is needed.

IME WP1080 needs a separate bec when you get out on the rocks. "thumbsup"

Just contact HeyOK - he'll customize it as you like, no worries!

https://www.freewebstore.org/HeyOK-Performance

Nice! "thumbsup"

I'll probably run it at the 6v till I can get the clearance on another $40 after buying a $100 servo budget is everything. Lmao! After all said & done for $10 more I could be running a savox 2290, but I think that's a bit of over kill & I don't want to start breaking other stuff cause my steering is so strong

That's fine temporarily. Savox....thanks but no thanks, I'll pass. "thumbsup"

...I’ve owned both the Holmes and the Pro Modeler (420 &470) the PM is far better IMHO. I ate 3 Holmes , JRH warranted them (1v1 and 2v2) ate the gears, look at the difference.

Hang up and Drive

Agreed. "thumbsup"

 

[JatoTheRipper]

IME WP1080 needs a separate bec when you get out on the rocks. "thumbsup"

You're the first I've seen say that the 1080 needs an external BEC! What makes you say that? What servo are you running?

I've tried them with a few different brands of servos and I don't have any issues at all.

 

[AnimalHippie]

I really think the promodeler is the way to go. Looking at the gear set of both side by side. PM just looks to be built stronger. Spent 30 mins on the phone with Jon a couple weeks back. He's a great guy. Think I might try to go pick mine up in person. All around I think this servo will do well on my rig. If anyone is good at putting stuff to the test. I for sure am! I might not go bashing or jumping, but I'll Damn sure try to crawl up anything & go anywhere I think there's a chance. You'll definitely get a honest review with some video out of me. Thanks for all your help guys! Glad to have found this forum & all the awesome people here

 

[Natedog]

In my TF2 with the stock RTR Twister servo and with DS3218 $20 servo hotness. I stalled both servos (was not trying very hard either), the DS3218 was way more powerful and didn't get hot like the RC4WD Twister did, unfortunately neither is rated for 7.4v.