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06-14-2011, 11:27 AM | #1 |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
Posts: 1,153
| xr10 servo 7980,7950 or s9157
So I have a jr8711 that has just a little bit of gear trian slop and that is just not gonna do for me and my pricy xr10. I rebuilt it with a new case and gears and it's way better but my old 5955tg has zero slop after years of use in my 6.5lb creeper and had no issues other than it runs rather hot. So here is my issue, I can get a hitec 7950th, 7980th or a futaba s9157. What is the best voltage to run the hitec hv servo's at safley. I hear alot of people fry them running at 7.4v. I'm using the futaba r2104gf rx from my 4pl rated up to 8.4v I wanna know if the 7980th will fit without mods, I have the bwd servo mount so thats all good but does anything on the axles need to be shaved for clearance, will my rowdy servo protector work with it? Issue with the futaba I'm having is that I don't want it to develop gear slop too since it is steel geared but I have no experiance with them to know so hoping someone can let me know how it works. The 7950th sorta seems like the best option cause the rowdy servo protector I have will work with it, has lots of torque and is ti geared so I assume it wont develop any slop like my 5955tg This is a hard decision because it sorta comes down to price here since I can purchase all of them at a similar one but I don't wanna hack stuff to make it fit, it has to be protected with a servo plate and it MUST NOT HAVE ANY SLOP Thanks for whatever input you have for me. Kurt Last edited by kurtus; 06-16-2011 at 05:23 PM. |
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06-14-2011, 11:51 AM | #2 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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I recently bought a 7950 to upgrade my 7955, power seems good. The 7950 is rated to 7.4VDC, the 7955 is rated to 6.4VDC (IIRC), thus you should have no issues with the 7950 @ 7.4VDC. This is in a 2.2 Bully @~6.7lbs The 7980 is a stronger servo, but a tiny bit bigger in all dimensions. You can look up the sizes online to see if it creates a clearance issue. |
06-14-2011, 11:53 AM | #3 |
20K Club Join Date: Jul 2004 Location: Sending illegals home one Hayabusa at a time.
Posts: 22,981
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BLS157 would be the servo to get. Over 500 oz/in of power at 7.4 and in a standard size case.
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06-14-2011, 01:36 PM | #4 |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
Posts: 1,153
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06-14-2011, 01:39 PM | #5 | |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
Posts: 1,153
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06-14-2011, 01:41 PM | #6 |
I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
| Actually, I did just the opposite. Futaba was not making any replacement gears for their servos for a while and I got tired of waiting to fix my three broken BLS152 servos....
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06-14-2011, 02:29 PM | #7 |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
Posts: 1,153
| Thx, that's what I need to hear cause I'm done replacing gears so futaba may just give me the same outcome as my jr. Looks like the 7950th is possibly the most logical purchase, any bad experances with that servo and why are people replacing the 7950 with anything else?
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06-14-2011, 02:35 PM | #8 |
I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Well, I run the 7950 in my 2.2 because of the standard size....it has the power to throw the truck around when I need it. |
06-14-2011, 02:43 PM | #9 |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
Posts: 1,153
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sweet, my buddy fred0000 is running one and really likes it but he's running it at 6v because of the wantamix he uses with his 3r. What voltage you running at?
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06-14-2011, 02:47 PM | #10 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
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On the Hitecs, if you are worried about frying them, I heard that setting the overload protection value to 10% does wonders in saving them.
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06-14-2011, 02:53 PM | #11 |
Quarry Creeper Join Date: Aug 2009 Location: Phoenix
Posts: 224
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I was running a CS170 (7955TG) on my XR and changed out to the 7950TH just before our Summer Shootout. There are a lot of guys in our club running the 7950TH as well. My old setup was the CS170, BEC @6.1 volts powering rx and wantamix with 2 Mamba Micro Pro's (power wire removed to rx) with a DX3R. With the new 7950TH I changed it up with BEC @7.4 volts direct to servo with Y-harness and Yellow and Black wire going to RX, wantamix with the 2 mmp's with one esc powering the RX with a DX3R. I like it so far with no issues. |
06-14-2011, 02:55 PM | #12 |
RCC Addict Join Date: Apr 2010 Location: Ringwood
Posts: 1,233
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Hitec 7954 at 7.0v and in a 6.9oz bully no problum
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06-14-2011, 03:02 PM | #13 |
RCC Addict Join Date: Jul 2009 Location: Santa Rosa, CA
Posts: 1,349
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I'm not impressed with my 7950 at 6v. I would turn it up to 7v, but my rx can't handle it. |
06-14-2011, 03:45 PM | #14 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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06-14-2011, 03:51 PM | #15 |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
Posts: 1,153
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Great replies guys, thx so much. I'm going for the 7950th and I'll run it at 7v to get that little extra life out of it, I'm fine with my rx running high voltage so I wont need to rewire my rig. Thats a great tip on the overload protection SCorpionKing, might have to get a programmer with the money I saved would be really handy to have thats for sure.
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06-14-2011, 03:52 PM | #16 | |
cherry bomb Join Date: Jul 2006 Location: Nanaimo, BC, Canada
Posts: 1,598
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I am happy with the performance at 6v, but you can never have steering thats "too good" I upgraded from a HS-7954SH that I ran at 6v aswell. | |
06-14-2011, 04:06 PM | #17 | |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
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06-14-2011, 04:32 PM | #18 | |
Shelf queen Join Date: Aug 2008 Location: Internet
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06-14-2011, 05:21 PM | #19 |
RCC Addict Join Date: Oct 2009 Location: Nanaimo, BC (Vancouver Island)
Posts: 1,153
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06-14-2011, 05:34 PM | #20 | |
Rock Crawler Join Date: Apr 2010 Location: Kelowna, B.C., Canada
Posts: 529
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Or this I don't think with the 7980 and servo protector you would have to do many mods. I was able to get standard servo clamps to fit. It is only about1-2mm bigger in each dimension. On my xr it never gets warm and I have never stalled it out The 7980 also has slightly bigger gears which will help with the strength of them. Last edited by ax-10 crazy; 06-14-2011 at 05:36 PM. | |
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