Intermittent help

[rondoolaa]

We have 5 minute race's in our 14th scale micro buggy heats and every race about 4 to 4 and a half minutes in my car will go slower for a few seconds then speed up again then randomly go slower again then speed up again and so on, it's a pain when your winning a race and then this happens on the last minute and costs you the race. I have tried multiple motors and its the same, the esc is a hobbywing 60A , with overheat switched off, servo is savox 1257mg,

If anyone had any idea what could be causing this please help, thankyou.

[Yorkiebar]

If everything else is functioning still (i.e. steering) ruling out a brown out of the RX, is it potentially hitting the low voltage cutoff on the lipo? Not having run one of these I don't know how long a lipo normally lasts in one.

Worth turning down the cutoff voltage on the ESC?

Are both motor and ESC temp cutoff disabled?

[rondoolaa]

Hi firstly thanks for the reply, my overheat is switched off and my low voltage cut off is set at 3.2v per cell, I use 2s 2300mah ip lihv lipos, the batteries come off the track with between 35% and 48% remaining in them and they show around 7.4v remaining,
I may try a bigger spur or lower pinion or change the esc,
The esc was brand new when put in the car but even new things can be faulty I suppose.

[mattr]

Probably low voltage then.
Every time you nail the throttle the voltage drops below your 6.4 threshold and false triggers LVC.

If you've got 35-48% left after a race, switch your LVC off and add a timer to your Tx.

[rondoolaa]

I'll try that tonight at racing and let you know the outcome, thankyou

[rondoolaa]

Thanks yorkiebar and mattr,
I turned the low voltage cut off from 3.2v per cell to 3.0v per cell and I managed a 6 minute practice with no loss in power and 40% still left in battery,
I raced it in 5 x 5 minute race's and it didn't cut out even once,

Thanks again for your help,
Its appreciated

[Yorkiebar]

Awesome, glad to help :)

[mattr]

Cool. Glad it worked.