Ko BMC Speedo
07-21-2009, 10:05 PM
#571
Did you make sure that your speed control is setup for a Lipo cutoff, as I think the default is still set to NiMH, and if thats the case you could have discharged your Lipo too far. I've seen Lipos swell when they get over discharged.
Sorry I now see it was suggested already, but I'd triple check for Lipo cutoff. Or check the pack voltage when your coming off just to make sure the cutoff is working. Just because you only ran for 7 minutes doesn't mean you could be at the bottom of the curve. Maybe the pack didn't get fully charged too. Just throwing some ideas out there.
Sorry I now see it was suggested already, but I'd triple check for Lipo cutoff. Or check the pack voltage when your coming off just to make sure the cutoff is working. Just because you only ran for 7 minutes doesn't mean you could be at the bottom of the curve. Maybe the pack didn't get fully charged too. Just throwing some ideas out there.
Last edited by Johnny Wishbone; 07-21-2009 at 10:10 PM. Reason: Slow reader
07-22-2009, 05:53 AM
#572
Did you make sure that your speed control is setup for a Lipo cutoff, as I think the default is still set to NiMH, and if thats the case you could have discharged your Lipo too far. I've seen Lipos swell when they get over discharged.
Sorry I now see it was suggested already, but I'd triple check for Lipo cutoff. Or check the pack voltage when your coming off just to make sure the cutoff is working. Just because you only ran for 7 minutes doesn't mean you could be at the bottom of the curve. Maybe the pack didn't get fully charged too. Just throwing some ideas out there.
Sorry I now see it was suggested already, but I'd triple check for Lipo cutoff. Or check the pack voltage when your coming off just to make sure the cutoff is working. Just because you only ran for 7 minutes doesn't mean you could be at the bottom of the curve. Maybe the pack didn't get fully charged too. Just throwing some ideas out there.
07-22-2009, 09:32 AM
#573
It may not be that bad, but its not supposed to swell at all. I would go through the car top to bottom and check everything, bearings , belts, gears, motor and make sure that nothing is bound up and causing excessive ampdraw on the battery. It is possible that you got a defective pack, that happens from time to time. Or the pack got damaged unbeknownst to you. I run the Orion Lipos and have not had a single issue with them. Is this a hardcase lipo?
Did you make sure that your speed control is setup for a Lipo cutoff, as I think the default is still set to NiMH, and if thats the case you could have discharged your Lipo too far. I've seen Lipos swell when they get over discharged.
Sorry I now see it was suggested already, but I'd triple check for Lipo cutoff. Or check the pack voltage when your coming off just to make sure the cutoff is working. Just because you only ran for 7 minutes doesn't mean you could be at the bottom of the curve. Maybe the pack didn't get fully charged too. Just throwing some ideas out there.
Sorry I now see it was suggested already, but I'd triple check for Lipo cutoff. Or check the pack voltage when your coming off just to make sure the cutoff is working. Just because you only ran for 7 minutes doesn't mean you could be at the bottom of the curve. Maybe the pack didn't get fully charged too. Just throwing some ideas out there.
4000mah x 35c, 5000 x 35c, 4900 x 35c all hard case
The problem stated when I starts to use the Orion 6.5t and profile changed to the Reedy Race mod settings.
So I'm just wondering whether the timing advance on the esc which is #2 or the high braking freq could have caused this or a faulty motor? Normally a Lipo would swell becoz of overly high discharge rate, in this case I don't think so.
07-22-2009, 11:18 AM
#574
the car was super smooth so there's nothing binds. defective pack? The problem started when I starts to use Orion 6.5t and I don't think it's caused by the motor, coz it's slower than LRP X12 6.5t! Hardcase lipo it is.
Set to lipo cut-off, can't play play with this setting. Mostly 7+v after run. Checked lipo after charged ard 8.38 - 8.4v.
4000mah x 35c, 5000 x 35c, 4900 x 35c all hard case
The problem stated when I starts to use the Orion 6.5t and profile changed to the Reedy Race mod settings.
So I'm just wondering whether the timing advance on the esc which is #2 or the high braking freq could have caused this or a faulty motor? Normally a Lipo would swell becoz of overly high discharge rate, in this case I don't think so.
Set to lipo cut-off, can't play play with this setting. Mostly 7+v after run. Checked lipo after charged ard 8.38 - 8.4v.
4000mah x 35c, 5000 x 35c, 4900 x 35c all hard case
The problem stated when I starts to use the Orion 6.5t and profile changed to the Reedy Race mod settings.
So I'm just wondering whether the timing advance on the esc which is #2 or the high braking freq could have caused this or a faulty motor? Normally a Lipo would swell becoz of overly high discharge rate, in this case I don't think so.
07-22-2009, 12:06 PM
#575
Okay, hate to sound like a broken record, but the profile you mentioned is pre set to Nimh, so unless you specifically set it to Lipo after you did your write you might still be defaulting to the Nimh instead of Lipo setting. You also say 7+volts, but what is it, as I think the Lipo safe cut off is 3.6 volts which should make your pack at at least 7.2 volts. Can you snapshot a pic of your profile coming off the SC and post it in a pic? Might be something to look at.
Also it doesn't have to be a overly high discharge rate to swell the pack, it can be caused by going to deep voltage wise into the pack too.
Also it doesn't have to be a overly high discharge rate to swell the pack, it can be caused by going to deep voltage wise into the pack too.
07-23-2009, 03:58 AM
#576
Tech Apprentice
has Orion released the new v1.5 BMC? is there any news about this?
07-23-2009, 10:07 AM
#577
Okay, hate to sound like a broken record, but the profile you mentioned is pre set to Nimh, so unless you specifically set it to Lipo after you did your write you might still be defaulting to the Nimh instead of Lipo setting. You also say 7+volts, but what is it, as I think the Lipo safe cut off is 3.6 volts which should make your pack at at least 7.2 volts. Can you snapshot a pic of your profile coming off the SC and post it in a pic? Might be something to look at.
Also it doesn't have to be a overly high discharge rate to swell the pack, it can be caused by going to deep voltage wise into the pack too.
Also it doesn't have to be a overly high discharge rate to swell the pack, it can be caused by going to deep voltage wise into the pack too.
Btw, how do u guys keep ur lipos? I normally charge it full after race and will recharge it before using it. That's the practice right?
Thanks
07-23-2009, 10:17 AM
#579
Tech Master
iTrader: (13)
they say if you are going to store them for a long time (months) to store them at 3.8 to 3.9 volts per cell, for just weekly racing i usually just leave it where it comes off the track (running stock only takes out about 2000mah) so thats almost 1/2
07-23-2009, 02:17 PM
#581
Tech Master
iTrader: (13)
weekly fully charged probably not too much a problem, i think the fully charged storage main loses capacity, your swelling is probably due to running mod in heat (malaysia pretty hot isn't it?), if the minor swelling of a mm or two goes back down after the pack cools back down i really wouldn't worry about it
07-27-2009, 06:28 PM
#583
Can someone point me in the direction as to who is the head honcho on this thread as in who knows the most about these speedos?
Last edited by #88driver; 07-27-2009 at 06:51 PM.
07-27-2009, 07:02 PM
#584
07-27-2009, 07:05 PM
#585
but you sir will have a pm in about 3 minutes