Mojave 6s 185 BLX Low Voltage Cutoff

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Order66

Lover of reproducible results
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Location
Eugene, Oregon
Arrma RC's
  1. Fireteam
  2. Kraton 8S
  3. Mojave
  4. Talion
Noob alert here. Glad to find this thread, but want to ask a bit further on the topic

I just got a new Talion and Mojave, and I think that I’m experiencing the same issue. New packs cutting out at 3.8V. All cells reading uniform voltages within .01

I quickly learned that the new 185 ESCs no longer offer a choice between NiMH and LiPo (and now only 5 speed settings too), so I can’t use this workaround, but yeah, why is it shutting down at 3.8?

Can someone detail the different modes Im experiencing near the end of a run? I observe a different behaviors at this time:

1) Truck stops. Resetting power switch brings full juice again for a time. Can usually do this 2-3x
2) Truck runs slowly. I end the run

Voltages in condition 1 (if I don’t restart) are on the order of 3.9-4V. Again all batts within .01

Voltages in condition 2 reach 3.7

I outfitted with YR esc booster and motor fan, but running in Oregon, 55 degree weather

I’m running middle-high end 6S packs with 75C discharge rate and 6500 mAh capacity. I only use balance charge mode, but must also confess that I’ve only charge cycled them 3-4x. Will this improve with battery life? I’ve read here and there that batt packs need a few cycles to reach peak capacity.

What I’d ultimately like to do is bypass the ESC control of my pack altogether and just use a third party LVA. In the event that I upgrade the power train, what’s a recommended motor/esc combo for the Mojave that will allow me to do this? (The Mojave is my current fave of the two)

Huge ups to the contributors in this thread. You’re doing Gods work and it’s thanks to your guidance that in three weeks of deep woods and sandlot bashing, I’ve smashed and successfully replaced the following:

(Go easy, again, noob here and I’ve only managed 2-3 runs where something was not gored, ground up or gnashed)

exploded center diff (Mojave, first run. Arrma replaced it!)

snapped A arms (both rigs)

snapped suspension rod ends (Talion, keeps happening)

Ripped tires (put the Talion tires on the Mojave- try to keep the front end on the ground!)

broken body and bumper mounts

Mojave body taking a serious beating

Servo in Talion (went with broken suspension arm)

Also, I put Proline slingshot 3.8s on the Talion and cannot keep the thing off of it’s roof in the sand! Is the fix for this a wheelie bar or a ballast weight in the front end?

Sorry for this smorgasboard of Qs, at the moment I just want a few more precious seconds of bashing, at any cost!

And a SERIOUS shout out to Arrma about the Mojave. I have not driven an RC since my Tamiya Hotshot in 1983 and I feel like a pro every time it lands on its feet, digs in, and speeds off. The thing practically drives itself! If you are thinking of getting one, do it.

The Talion spends a lot of its time airborne or cartwheeling; it obviously takes a good deal more finesse but I’m learning

Last note, per discussions elsewhere here, I swapped diff fluids on both rigs to 1M center and 50K front and rear. Noticeable difference in my ability to control! But is this goo cutting into run time?
 
Wow, so even with auxiliary cooling by the Yeah Racing fan on the esc it can overheat in 50F temps?

What’s a recommended ESC/motor combo that is going to be less conservative in its operation? I kinda want to run the thing at or near limits- seems crazy that power is cut at 3.8 V or overtemps kick in with so much juice left. I’m all for disabling the safety mechanisms if someone knows how, but I’ll take an excuse to upgrade too :)
 
Yes, sounds like overheating that you clear with a reset.
What pinion are you running and what surface are you on?
What is this " YR esc booster" ?

Picture of your setup might help.
Check your bearings or anything in the drivetrain that might bind. You should have nothing 'grindy' happening other than normal center diff to motor.

Edit: Dig a little through the forum as all your questions are occurring frequently, might be better to ask targeted questions and don't lump it all in one post.
No, diff fluids have nothing to do with runtime.
 
Thanks and apologies for the pile of Qs- it’s the Yeah Racing ESC cooler: Yeah Racing Aluminum Case 30mm Booster Cooling Fan Black #YA-0576BK https://www.amazon.com/dp/B07PY781KX/ref=cm_sw_r_cp_api_i_2Ss3EbFXANH4X

When the truck “pauses” during these overheats (if that’s what it is) do you just let the fans do their work for a few mins and continue?

No outrageous noises happening, but I was wondering if the extra heavy diff fluids might be driving an overheat shutdown
 
That fan should be plenty assuming it's running :rolleyes:
Yes, ESC cools down with fan running, that is why you can reset by cycling power.

Now you are down to
Pinion size? Stock or speed pinion?
Surface you are running on?
Stock tires or something bigger?
 
All else is stock, with the pinion that’s cane installed. I still don’t dare to try the 21T ??

Surfaces are pretty varied, but all are off road. I wonder if I just need to learn to ease the throttle a bit and actually let it sit and cool a while before running again if I want to get the full discharge to 3.3 volts
 
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