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Thread: Dual Hobbywing WP880's for MOA

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Old 06-13-2019, 08:04 PM   #1
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Default Dual Hobbywing WP880's for MOA

I had this thought...

I finally picked up a Bully2 (rtr, minus radio) so I could start mating the axles to my Dahu chassis I've had stashed away. I bought it "used" but it had never been run. While the dig function works, it kinda lags, and the esc is not smooth at all. I'd like to run dual esc's (not just dual outputs on 1 esc) and have the ability to run 4s. I've heard of people running dual 1080's, but those can't run 4s. Hobbywing released the dual output, 4s capable version of the 1080 a few months back, called the WP880, and it got me thinking. What do you guys think about a pair of these 880's, de-cased/stripped of unnecessary leads & switches, only running 1 motor from each?

I'm not opposed to spending more if I absolutely need to, but I don't think I'd really benefit from higher end esc's at my level of use. Dual 880's sounds reasonable in my pea brain since they're cheaper than 1080's ($33 each vs $42, and I already have the necessary programmer) and have the same programmable features, which have been adequate for me. I know they're going to be physically larger than BRmini's, FXR's, or even 1080's, but by de-casing them, and ditching RC4WD's dig unit I'll still be far ahead of where I'm at as far as size/weight. The lower voltage bec (6v compared to a 1080's 7.4v) won't be a concern as I'll either throw a CC bec or possibly a 2s rx pack in the car to power the servo (90% sure I'll go with a Futaba A700) anyway. If I'm out of my mind, I'd like to hear why this is a bad idea?
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Old 06-13-2019, 08:15 PM   #2
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Default Re: Dual Hobbywing WP880's for MOA

I don't know much about the ESC you're talking about but if it's cheaper you might want to make sure it has all of the same functionality as the 1080 they probably sacrificed something somewhere

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Old 06-13-2019, 11:14 PM   #3
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Default Re: Dual Hobbywing WP880's for MOA

It has all the same programmable features EXCEPT bec voltage (bec is non-selectable, but is pretty good at 6v/4a.) It's cheaper because it does not include the program card, simpler BEC, and has a crappier power switch without the program button. None of which are issues considering that I have the programmer (several of them actually), will be running the servo from separate power, and will be lopping off the power switches anyway.

I was leaning towards the 880's mostly because they're supposed to be just as smooth as the 1080's, but accept 4s, not really due to cost. I know there are a few good options from Tekin and Holmes, but if the 880 is as smooth as the 1080, I think I could be happy with this idea. I also like the simplicity/ease of use of the Hobbywing program card. The fact that they'd only cost $66 for the pair is just a bonus.

The 880 has dual outputs, but I figured I'd just desolder a set of leads off of each esc once I've pulled the cases and heatsinks off. Ironic, I know.
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Old 06-14-2019, 02:49 AM   #4
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Default Re: Dual Hobbywing WP880's for MOA

If what you say is correct I don't see an issue. I run dual 1080's and love them. yea, looks like a good deal to me. Still 80 amps with freewheeling hope its not some kind of 40A per motor though, probably isn't.
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Old 06-14-2019, 06:29 AM   #5
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Default Re: Dual Hobbywing WP880's for MOA

Quote:
Originally Posted by TheLetterJ View Post
I know they're going to be physically larger than BRmini's, FXR's, or even 1080's, but by de-casing them, and ditching RC4WD's dig unit I'll still be far ahead of where I'm at as far as size/weight.
I don't know how much will really be gained by de-casing because HW's brushed ESCs are usually buried in a block of epoxy that is only a bit smaller than the outer case. Also makes desoldering anything from the board a huge pain.
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Old 06-15-2019, 01:08 AM   #6
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Default Re: Dual Hobbywing WP880's for MOA

Good point on the epoxy, I may have to settle for some clipped wires. I looked up the dimensions:

Hobbywing 880:
length: 45.9
width: 34.7
height: 26.5
weight: 75g

Hobbywing 1080:
length: 36.5
width: 32
height: 18
weight: 58.5g

I test fit a couple 1080's in the "cab" section of my Dahu chassis (which is directly over the front axle/motor) and they fit very comfortably. I may/may not be able to get the length down, but I'm pretty confident that I can get the height, width, and weight of the 880's equal or less than the 1080's just by removing the plastic case and heat sinks. The car is currently sitting at exactly 3.5lbs with no servo, rx, esc's, or battery on board. I'll be adding Dlux knuckles (most likely with tungsten slugs and extra rings) but even with the added +/-10oz, I should be able to stay fairly near 4.5lbs rtr. I mention that mostly to say that I don't think I'll have heat issues after removing the heat sinks.

RPP is having a 15% off sale, so the pair of 880's is only $57.73, I think I'm gonna go for it!

On the same theme, I'll put my money where my mouth is and buy a pair of Yeah Racing Hackmoto "Just Climb" 16t 5 slot motors too. I know they say "7.4v max" but I'll take that risk. I know this car is probably still going to touch on that $1k mark by the time it's truly ready to run, but I think this inexpensive electronics package should perform very well and won't be throwing good money after bad. I'm rapidly realizing how people end up spending $2k+ on a well setup MOA!
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Old 06-15-2019, 05:44 AM   #7
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Default Re: Dual Hobbywing WP880's for MOA

I run dual 1080s in a bully 2 also. Very happy with them. No comps for me so I wasn't worried about weight or getting the most LCG possible. Have one on the chassis "tongue" where it's supposed to be and 1 one the rear axle. Paired them with HH trainmasters and a cheap dual stick fly-sky. Having differential throttle is sweet. Took a little getting used to but the control is unreal, plus I can just use it like a regular dig if I want. Win-win.
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