HELP ! MMP + Spektrum RX = cutting out ?

[Arct1k]

Originally Posted by BashemSmashem

Whatever , I am using 5200 Mah 30c batteries that are fairly new and a 8000 Mah 25c battery that is about 3 months old .

These batteries work great in everything I own except the truck with the MMP in it .

The motor and batteries also worked fine with the 2 other ESC's that were in the truck before ?

I'm not sure what it is then (dodgy RX) but if you've run a Castle Bec and it still cuts out you've ruled out the ESC being the issue...

[Stoomstrijkijze]

Originally Posted by Arct1k

No thats a 7950TG.... A 7955TG is a 6V servo...

Indeed. That's what's on the box. But the 7955TG can have 2S unregulated lipo without problems. Ask all the nitro guys. They run all run 2S lipo's with 7955TG servo's without any problems.

I mailed Hitec about it and it's true. The 7954SH is a 7955TG under the HV serie, but with steel gears and cheaper. And you don't lose your warranty if you run the 7955TG unregulated ;-) HITEC FTW :D

Just give that baby a lipo 2S lipo and it will be faster than ever :D If you don't feel safe about it, use the search in the nitro section of RC tech. (sry rc monster, but they have very big nitro section. NP to remove the last sentence if this isn't allowed).

Originally Posted by Email from Hitec

ORIGINAL: tohm

We have tested the HS-7955 with 7.4V lipo packs and have not had any adverse problems. Many of our team drivers/pilots have been doing this for some time now. The spec sheets will probably not change, as they were written in 2007, way before we did actual testing with the higher voltages.

At 7.4V, the torque is 387oz/in and the speed is .13sec.

Tony Ohm
Hitec/Multiplex USA

Originally Posted by Mike from Hitec

7955's while not officially rated at 7.4v should have no issues running 2S unregulated. The 5955 is not as durable at that voltage but seems to hold up fine in most cases.

Mike.

[thzero]

I've got a JR9100S in my XXX-T running a MMP, along with a Spektrum SR3100 receiver... don't have any glitching.

Originally Posted by SpEEdyBL

The JR9100s causes bad glitching and the spektrum s6040 makes a complete joke out of the bec all together. One twitch of the steering and the esc resets itself.

[SpEEdyBL]

I didn't mention that I was running 6s lipo in a 1/8 scale. The same esc in a 2s powered b4 runs the 9100s w/o glitching, but still drops the bec voltage enough so that my personal transponder doesn't always count laps, even with a power cap added.

I did some more running on it and it seems that the external BEC has fixed the problem , what I was seeing was hesitation from the motor , the RX was staying on all the time and not going out . Changed settings too sensored only and now its smooth .

[Topas]

I have the same problem with the MMP and a Savox 1258 servo. (I tried 2s 3s and 4s - I always get this cutting out!) This has to be a software problem --- castle can you fix it ?

[Topas]

No official statement in this case ?

[Cain]

hmm, I got too of these ESCs coming in to use with some 8.5 ballistics, now I am worried.

[kingdomracer]

I just came back from the track after testing the 7955TG and didn't experience the same hesitation at all. I did let my buddy drive and he got a glitch. I installed a CC BEC and took out the 7950TG and there was according to him still a slight glitch. Well, after talking a bit I believe my glitch is still ESC related and have a hunch that it's my fault after all. You see at my track some of the other guys who run electric use reverse (as to not have to wait for the turn marshall if your up against a wall or pipe) and I followed suit a couple of races back. I believe my ESC is simply stalling due to the reverse setting. Too bad it got real late because I definitely wanted to test it out. But, anyways the reason I'm sharing this is to hopefully get some feedback as to the possibility of the reverse setting being the culprit. And for those of you experiencing this glitch; Do you have the reverse setting on?

[kingdomracer]

Well an update on my last thoughts...NO...glitch still there!
But, I do feel I came up with a real solution.
First I'm going to use the MMP internal BEC to power my receiver and transponder, in other words plug it directly into the radio with all wires still in the plug including the red wire.
Second, I'm going to use the CC BEC to power just the HiTec 7945TG (just got it), so basically connect both the CC BEC and servo wire into a heavy duty servo Y adapter and before plugging it into the radio disconnect the red wire since the servo is what needs to be powered with a signal wire but the CC BEC just needs to be grounded back to the ESC.

I don't know if anyone has suggested this fix or tried it but theoretically it is sound and should work. I'll post up my results.

I stopped running the MMP , even though I love Castles other products I still think the MMP needs more tweaking before I will run it again .

I have a Novak Havok Pro SC ESC now and its SUPER smooth , works great with the same batteries I was using on the MMP and doesnt need an external BEC too run right , and works with the same high torque digital servo I tried to use with the MMP .

So far I am loving the Havok Pro SC it runs really cool and wasnt too hard to program .

[kingdomracer]

BashemSmashem are you still running a 2s setup for your SCT?
I run a 2s setup as well in my 4X4 with a 7950TH and 1409/1Y-MMP and have no problems whatsoever. I did install a spektrum cap.
My problem is not with my SCT it's with my LOSI 8 2.0.
My setup there is a 4s-1512/1.5Y-MMP with a 7945TH
batts: TP 4s 3200mah/40c

Well I just finished my wiring and will post up my results after a couple rounds at practice.

Yes I am running a 2s setup in a Hyper 10SC with a JR 9100T servo , tried a cap and it didnt work , went too a external BEC and the cutting out went away but it still didnt run the Ballistic 550 motor right , I would get this weird cogging when going slow around corners no matter what settings I would try .

The Havok Pro SC ESC is running the same setup with no problems at all .

[slimthelineman]

Try going back to the last non beta software for the cogging. As far as your rx cutting out, your running 2s which is only 7.4v and your asking your bec to give 6v no matter what. A hard thing to do when your battery voltage sags under load. Run 3s or if you must use 2s turn the bec voltage down. Nothing wrong with the mmpros. Just more sensitive than the Slovak stuff cause it's more adjustable. Pretty sure there is a post in the forum where Patrick addressed this issue try searching for it.

Gee slim thanks for clearing that up for me (The MMP doesnt work as well as the Novak because it has more adjustability) . Tried going back several versions and it still was cogging (though I am not sure if you could call it cogging since the truck was already moving) . I tried darn near every setting and suggestion that was thrown my way and nothing got the MMP to work the way it should . I even ran a Mamba Monster in it on 2s and it didnt cut out or cog . IDK maybe something is wrong with my MMP ?