Xmaxx ultimate cogging problem, please help

[rc-enthusiast]

Hello everyone, so I bought a brand new xmaxx ultimate and immediately removed all electronics and upgraded entire truck. Took it for test drive and it does 55 mph with gps and seems to run fine except one thing. At stand still if I punch the throttle fully it coggs and hesitate from a stop to full trigger. As for my setup everything is brand new truck and upgrades! It has the hobbywing max6 g2 esc and hobbywing g2 sensored 5690 motor with vitavon mod 1.5 20/35 gearing. My batteries are two 4s innovation rc 10,000 mah 100c lipos by cnhl. The only programming setting i changed with the hobbywing app is punch from 5 to max 9 setting. It's far from being able to do standing backflips which I was hoping for. I see kevin talbot doing standing backflips on a stock xmaxx with only a upgraded max 6 esc so why can't mine do it? And when I tap the throttle fully down it coggs out before taking off but does not do backflips from a standstill nor does it even flip back on its roof. I do have many other upgrades like m2c flex drive shaft, basher chassis brace and dual hyperflow 4s fan setup for motor. I don't know how to set every setting on the esc to make the most out of it either. I did however calibrate my esc to my flysky noble nb4+ and I also do have a flysky reciever with gyro active at 35%. Please someone help me I've invested close to $3500 into this setup in past month and for it to not perform better or as good as keys stock xmaxx has me like wtf. Thanks for all the help guys.

 

[9x19]

Maybe try a different receiver... just to rule out a flaky response with that.

 

[WickedFog]

Have you tried disabling the gyro? Do a factory reset on the ESC and recalibrate. See if that does anything.

 

[rc-enthusiast]

Maybe try a different receiver... just to rule out a flaky response with that.

Reciever is literally brand new less than 2 weeks old, as is the entire truck and every other upgrade on it.

 

[WickedFog]

I would have personally gone for the Max5. The X-Maxx is on the verge of being too big and heavy for the Max6. Adding any aluminum upgrades just pushes you closer to that Max6 system being a bit inadequate.

 

[rc-enthusiast]

Have you tried disabling the gyro? Do a factory reset on the ESC and recalibrate. See if that does anything.

I haven't tried disabling the gyro but I will next time I get it out. And I recalibrated the esc to my transmitter again last night.

 

[rc-enthusiast]

I would have personally gone for the Max5. The X-Maxx is on the verge of being too big and heavy for the Max6. Adding any aluminum upgrades just pushes you closer to that Max6 system being a bit inadequate.

You know I was thinking about doing the max5 but everyone said do the max 6 with 5690 combo so I did. But I'm pretty sure my 5690 motor will work with max5 so maybe I can go ahead and change the esc out? What do you think I will benefit from if i do this?

 

[WickedFog]

I haven't tried disabling the gyro but I will next time I get it out. And I recalibrated the esc to my transmitter again last night.

But did you reset it to factory settings? Stranger things have been known to fix problems. When all else fails, the first step is to reset and recalibrate.

If that doesn't fix it, maybe that ESC or motor has a problem. Contact HW and see what they say. A video of the problem would help. Your gear ratio seems fine for that kit. And I know others have used the Max6 combo in them. So I am at a loss other than that.

 

[rc-enthusiast]

But did you reset it to factory settings? Stranger things have been known to fix problems. When all else fails, the first step is to reset and recalibrate.

If that doesn't fix it, maybe that ESC or motor has a problem. Contact HW and see what they say. A video of the problem would help. Your gear ratio seems fine for that kit. And I know others have used the Max6 combo in them. So I am at a loss other than that.

I seen a bunch of people on YouTube experiencing the same issue with different cars and they went down on the pinion sizes and that fixed it

 

[WickedFog]

I seen a bunch of people on YouTube experiencing the same issue with different cars and they went down on the pinion sizes and that fixed it

That would be my next suggestion after you try a factory reset. I looked at your ratio, and it seems like it should be fine. I know there are much faster X-Maxx's out there, running taller gearing. So

 

[rc-enthusiast]

That would be my next suggestion after you try a factory reset. I looked at your ratio, and it seems like it should be fine. I know there are much faster X-Maxx's out there, running taller gearing. So

Ok thx for checking that, I literally just ordered a new max5 esc that I'm gonna try with my 5690 hobbywing motor hopefully it pushes more power than the max6 esc on it. What app or website did you use to check the gearing I'm running?

 

[WickedFog]

Ok thx for checking that, I literally just ordered a new max5 esc that I'm gonna try with my 5690 hobbywing motor hopefully it pushes more power than the max6 esc on it. What app or website did you use to check the gearing I'm running?

I have an X-Maxx I started building a couple years ago. I did some digging and found the gear ratios to be around 1.75:1 or so with the gearsets I was looking at. I started a spreadsheet and calculated the top speed based on the various ratios. As you can see, your ratio comes pretty close to the 1.862, which does do 55 mph.

Another thing I just though about, I know your kit is all fairly new. But you don't have something binding somewhere do you? How was your temps?

 

[rc-enthusiast]

Temps were great could hold my hand on motor no problem. No binding.

 

[CertifiedMike]

Is this a servo amp draw issue by chance? It sounds like you've checked a lot of other things here... just a thought.

 

[CertifiedMike]

Your batteries SOUND huge! I'm not a battery guru or anything... are your batteries old? How are the connectors and wiring? Any chance you've got a sagging issue?
My stuff is 1/10 scale but this sounds like a sagging issue I was having. My solution was obvious because my battery was undersized by a LOT!

 

[rc-enthusiast]

Your batteries SOUND huge! I'm not a battery guru or anything... are your batteries old? How are the connectors and wiring? Any chance you've got a sagging issue?
My stuff is 1/10 scale but this sounds like a sagging issue I was having. My solution was obvious because my battery was undersized by a LOT!

Everything is brand new literally less than a month old, even my 10,000 mah 100c 8s lipo setup is brand new not even a full discharge yet on them. All connectors and wiring is brand new and superior. I soldered Everything and I'm a master solderer. This issue is something different

 

[rc-enthusiast]

I would have personally gone for the Max5. The X-Maxx is on the verge of being too big and heavy for the Max6. Adding any aluminum upgrades just pushes you closer to that Max6 system being a bit inadequate.

So your comment made me just order a max5 esc, I'm gonna pair it with my existing 5690 hobbywing sensored motor. How do you think that will do? Will I notice improvements?

 

[CertifiedMike]

Everything is brand new literally less than a month old, even my 10,000 mah 100c 8s lipo setup is brand new not even a full discharge yet on them. All connectors and wiring is brand new and superior. I soldered Everything and I'm a master solderer. This issue is something different.

Does it cogg when set back to stock? Punch 5?
I'm guessing you've gone thru the programming to verify it didn't come to you with "odd" settings?

I've got defective gear, brand new, before. I wouldn't place ALL my confidence there either.

I don't know this gear well enough to be of much help here I'm afraid.

 

[CertifiedMike]

A new system to compare with will make this MUCH easier!
I hope this gets you running right!

 

[WickedFog]

So your comment made me just order a max5 esc, I'm gonna pair it with my existing 5690 hobbywing sensored motor. How do you think that will do? Will I notice improvements?

Well, I would not think the ESC being slightly underrated for this application would be causing your cogging issue. The Max5 combo I was saying I would go with comes with a 56118 motor, which would have a lot more torque, since it has roughly a 30mm longer can. The longer the can, the longer the magnets are inside, which will give the motor more oomph. The difference in ESC's however is 50A, which means the Max5 will be able to handle a much heavier rig. It would be overkill since the Max5 would be right at home in an 8S Kraton, which is a much heavier vehicle stock, but it would be much safer then using an ESC that is right on the edge of being powerful enough. Could your current ESC be experiencing a brown out and suffering an amperage spike when you first hit the trigger? Possibly. That's why I suggested you contact Hobbywing and see if they can give you any ideas.

If you do notice a difference, then I would suspect something is wrong with that other ESC. If it doesn't fix your issue, try a slightly smaller pinion/bigger spur combo. If that doesn't fix it, my guess is your motor is struggling. I would have personally contacted HW first before buying a new ESC.