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Old 04-25-2012, 10:54 AM
  #14986  
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Hey all,

I dropped an Rx8 in my SCTE with a Revtech 4800 4 pole. Im running Ty's setup with a 14 T pinion.

my question is for some reason the battery went below voltage cutoff and puffed my lipo. After the run i checked the volatge on the lipo and both cells went below the 2S setting.

is there anything i can check my lipo cutoff settings or any troubleshooting i can do?
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Old 04-25-2012, 11:00 AM
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Originally Posted by Moogumby
Hey all,

I dropped an Rx8 in my SCTE with a Revtech 4800 4 pole. Im running Ty's setup with a 14 T pinion.

my question is for some reason the battery went below voltage cutoff and puffed my lipo. After the run i checked the volatge on the lipo and both cells went below the 2S setting.

is there anything i can check my lipo cutoff settings or any troubleshooting i can do?

Lipo cutoff is off by default. Did you change it to 2s before you ran it?
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Old 04-25-2012, 11:13 AM
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Originally Posted by timannnn6
Lipo cutoff is off by default. Did you change it to 2s before you ran it?
yes.. made sure to set it to 2S. im going to recheck it today as i havent had a chance to check it since sunday.
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Old 04-25-2012, 11:16 AM
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Do you happen to have the Hotwire? If so you can set a manual cutoff higher than the default, that's what I do. I think the setting I chose is something like 3.64 or thereabouts...
Last edited by Jake C6R; 04-25-2012 at 11:28 AM.
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Old 04-25-2012, 12:01 PM
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Originally Posted by Moogumby
Hey all,

I dropped an Rx8 in my SCTE with a Revtech 4800 4 pole. Im running Ty's setup with a 14 T pinion.

my question is for some reason the battery went below voltage cutoff and puffed my lipo. After the run i checked the volatge on the lipo and both cells went below the 2S setting.

is there anything i can check my lipo cutoff settings or any troubleshooting i can do?
This may not be a voltage cut off issue rather it could be a low quality battery issue. You can puff a lipo without hitting LVC.

What batteries?
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Old 04-25-2012, 12:28 PM
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Originally Posted by Randy_Pike
This may not be a voltage cut off issue rather it could be a low quality battery issue. You can puff a lipo without hitting LVC.

What batteries?
Agreed. Older batteries are also more susceptible to puffing under heavy loads than the newer ones.
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Old 04-25-2012, 12:46 PM
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Anyone have a good setup for boosting a 4 pole motor??
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Old 04-25-2012, 12:48 PM
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Originally Posted by rickybobbyxxx
Anyone have a good setup for boosting a 4 pole motor??
4 pole motors don't boost very well. I would suggest staying below 30 on the timing advance slider with the default start/end rpm's. I run my 4 pole motors at 10 and gear up if I need more power as this produces less heat than adding timing.
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Old 04-25-2012, 01:48 PM
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Originally Posted by Randy_Pike
This may not be a voltage cut off issue rather it could be a low quality battery issue. You can puff a lipo without hitting LVC.

What batteries?
Revtech 60C 6500 Mah..

little under 2 weeks old.
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Old 04-25-2012, 05:38 PM
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Originally Posted by ironzgti35
What builds more heat, a torque setup or high speed setup? For example a 15/45 or 17/45. Do high speed full throttle runs build more heat the stop/go throttle on a tight track
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Old 04-25-2012, 05:39 PM
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Originally Posted by AWDdude
typically high torque heats the motor up more and high speed heats the esc up more.
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Old 04-25-2012, 05:40 PM
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Originally Posted by AWDdude
typically high torque heats the motor up more and high speed heats the esc up more.
Originally Posted by DaveW
I went from 50/16 to 46/18 (truggy) with reduced timing, and motor temp dropped but ESC temp went up (still no ESC fan). The power difference was astounding (not top end, but the powerband), and it was a completely different beast to try and turn consistent laps with.
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Old 04-25-2012, 05:40 PM
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Originally Posted by Frank L
I am not familiar with the AE cars but that seems geared very high to me. I would think a 16 tooth pinion would be more appropreitate.
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Old 04-25-2012, 05:41 PM
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[QUOTE=edlee;10639646]Hey randy. I got a RX8 T8 1900kv motor in a rc8be with a 18 pinion and a 46 spur running a 4s 5000 mah pack, from what I have read its an appropriate gearing. I'm getting some awfully high temperature readings on my esc, all 7 leds and sometimes just led7 comes on. I also eventually lose all my reverse, the RX8 still receives the signal but nothing happens. When I let the RX8 cool down to suitable temperatures it works like a charm. Hope you can shine some light into this.

thanks,ed[/QUOTE5
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Old 04-25-2012, 05:43 PM
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Originally Posted by Randy_Pike
You're under geared for anything but a small indoor track. Gear up to 20-22. You're getting high temps due to the incorrect gearing.
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