Cogging when Full power?

[Klausen]

Hi

I have a small problem. When I give my E-maxx almost full throttle from still stand, it is making these small jumps, before finally accelerate. Does anybody know what causes this?

I am using the HV4400 maxx with Maxamps 6000 mah lipos.

Any help is greatly appreciated.

Regards
Jesper

[crazyjr]

What is your gearing? The hv don't like more than 13 or 14 /66 gearing with 32 pitch

[Klausen]

12/70

[BrianG]

You could have a power issue. Castle explains that this symptom is most likely caused by weak batteries, but a poor solder joint and/or crappy connectors could do that as well.

[Serum]

Not using the tamiya connectors?

[Klausen]

Th HV esc and the Maxamps lipos are connected via deans.

Could it be that the steering servo takes the power before the esc?

The lipos are brand new, and it was their first run. after have charged them full.

[captain harlock]

What other connectors are you using?( between motor and controller?).

[Klausen]

They are wired directly on th HV system.

It may be the lisaver. It is the one on Mikes webshop.

[Serum]

Perhaps the 6000packs aren't up the task. Try it without the LVC and see what happens.

[Klausen]

I know this is a long time ago, but today I finally tried without the lisaver, and at fulle throttle the E-maxx landed right on its roof ;o)

Do you know if there may be something in the lisaver, that keeps it from accelerating too fast, to keep it from flipping backwards?

[BrianG]

Under high acceleration, the motor can pull a substantial amount of current, which could be causing the lipo voltage to drop below the LVC's threshold. Then it kicks in removing the power allowing the battery voltage to rise again which will make the LVC allow throttle input. This cycle can happen quickly over and over again causing the symptom you are experiencing.

Gearing down more will lessen the load on the motor and pull less current. I would try that and see if the symptom lessens or goes away. If so, the issue is the batteries...

[crazyjr]

^^ that sounds like the problem. My experience with the 4400 was that it was power hungry, My NIMH's would come out of my E-revo scalding hot, More hot than same batts coming out of my mamba setups

[neweuser]

I agree, or in my case when this was happening, the volatge just needed to drop a bit more and it ran no problems.

[Serum]

The batteries simple can't deliver the power needed for the setup; The maxamps 6000 packs are not the best money can buy; they don't hold their voltage very well under high load. Try contacting Austin and ask for an upgrade to 8000 (2P) packs. he is very kind, i think he will take care of you.

[neweuser]

Hmmm, I had 6000's and they seemed enough to push my 10xl....just lacked the run time.
But Serum is right, I would contact Austin, who is a great guy.