two fast questions!!! - Page 3 - RC-Monster Forums

Revracer · 06.17.2008, 04:20 PM

i ended up braiding my wires and running a rx pack. ran 10 minutes hard no glitching. esc temps are down a tad. still burns to touch it though... the bottom is cool. but the heatsink is HOT. this was without a body too so it had plenty of airflow... other then a cap and fan now is there anything i can really do to drop temps? it still worries me some. and this is only the beginning of summer for us. itll go up another 10 degree or so and its already breaking 100 every day

lincpimp · 06.17.2008, 04:23 PM

Quote:

Originally Posted by Revracer

i ended up braiding my wires and running a rx pack. ran 10 minutes hard no glitching. esc temps are down a tad. still burns to touch it though... the bottom is cool. but the heatsink is HOT. this was without a body too so it had plenty of airflow... other then a cap and fan now is there anything i can really do to drop temps? it still worries me some. and this is only the beginning of summer for us. itll go up another 10 degree or so and its already breaking 100 every day

A fan will be your best bet, or lower gearing... You may try direct soldering the wires. That could be causing some resistance and thus heat in the esc?!

lutach · 06.17.2008, 04:24 PM

You might drop up to 10-15 degrees maybe more with a good fan. How long can you keep your finger on the heat sink before it starts to burn? If it take a while specially after 10 minutes, I think thats fine.

Revracer · 06.17.2008, 04:27 PM

its like. you touch it for a second and it burns you... on the heatsink atleast. near the bottom and the mounting plate, which is aluminum, arent that hot at all. its just the heatsink. I will try to double fan the esc and put a fan on the motor as well. the motor isnt running very hot. after about 10 minutes i can hold my finger on it for about 5-10 seconds and it still doesnt really burn you, just really uncomfortable.

lutach · 06.17.2008, 04:29 PM

Quote:

Originally Posted by Revracer

its like. you touch it for a second and it burns you... on the heatsink atleast. near the bottom and the mounting plate, which is aluminum, arent that hot at all. its just the heatsink. I will try to double fan the esc and put a fan on the motor as well. the motor isnt running very hot. after about 10 minutes i can hold my finger on it for about 5-10 seconds and it still doesnt really burn you, just really uncomfortable.

All your temps sounds fine to me. Just add a fan on the Mamba and it should be fine. The motor won't need a fan at all.

Revracer · 06.17.2008, 04:34 PM

the burning of the esc worries me slightly. it is literally too hot to touch. it burns you almost instantly. how should i mount a fan onto the esc? would the cap still be a good idea and help drop the temps or help performance at all? I want the most i can get out of this without sending it somewhere to be modded.

lutach · 06.17.2008, 04:41 PM

Quote:

Originally Posted by Revracer

the burning of the esc worries me slightly. it is literally too hot to touch. it burns you almost instantly. how should i mount a fan onto the esc? would the cap still be a good idea and help drop the temps or help performance at all? I want the most i can get out of this without sending it somewhere to be modded.

Some people screw the fan on, some use zip ties. The cap is a good choice as well.

Revracer · 06.17.2008, 04:58 PM

so basically $15-$20 will drop my esc a good 10-15 degrees? thats pretty good...

Sammus · 06.17.2008, 07:45 PM

Gear it down, your pushing that little thing waaayy harder that what was intended for it.

And we (I, at least) are saying doing these things MIGHT help it, no guarantees.

Revracer · 06.17.2008, 07:48 PM

there still isnt anyone who will tell me about running 12 cells instead of 3s lipo. would it help with temps since itll be less strain? and i have a 40tooth spur so ill try that sometime soon. whats with all these other people who run bigger motors than mine and their esc is fine. i just ran it with a 5700 motor on 3s in a buggy and it heated up just as much as in my revo. whats up with this?!

lutach · 06.17.2008, 08:04 PM

Quote:

Originally Posted by Revracer

there still isnt anyone who will tell me about running 12 cells instead of 3s lipo. would it help with temps since itll be less strain? and i have a 40tooth spur so ill try that sometime soon. whats with all these other people who run bigger motors than mine and their esc is fine. i just ran it with a 5700 motor on 3s in a buggy and it heated up just as much as in my revo. whats up with this?!

Get the weight of the 12 cells against the weight of the 3S lipos and you will see which one I would go for

. Add the fan, the caps and tell us what the results were. How fast is your vehicle geared for? You should aim for 35-40mph and if things are still over heating then it might be something else. See if your vehicles rolls freely without the pinion on the motor. The other day I did a little maintenance on my BPP and forgot to add shims to my diffs. Guess what happened? I thermalled my Schulze 40.160 and my 1521/1Y got kind of hot. Keep in mind my controller can handle over 200A. My truck wasn't rolling freelly and it caused a lot of strain on my electronics.

Revracer · 08:55 PM

Well everything seems to spin freely. the truck rolls absolutely fine. I recently rebuilt my tranny with FOC and close two speed. Could running the two speed cause it to heat up more? since it changes gears could the strain change cause it to heat up faster? or more? I also have a feeling that my slipper is kind of tight right now. on BrianG's thing im geared for 36mph, on another program I used it was 37mph. I ran a rx pack and it didnt help the temps much at all. still very very hot. I ended up melting my hex hubs on my last run with it. the rear ones atleast.

Revracer · 06.17.2008, 09:03 PM

and also i should mention that bluegrooveconcepts used this same setup in their revo conversion and had it geared for 45mph and said it ran flawlessly and didnt heat very badly.

06.18.2008, 04:50 AM

Did you pull the red wire out of the esc to rx cable? I think it was the red one anyways....

Sammus · 06.18.2008, 07:43 AM

The esc temp wont make you melt hex hubs - make sure you wheel nuts are tight, they can loosen and roost out the hex pretty bad.

I still say gear it down.. I run 6s lipo with a 11XL geared for 35mph on a turnigy HV and my motor and batteries absolutely cook, a 3s lipo must be drawing a lot more current to get the same speed, and the turnigy HV is rated to 100A, just like the mamba.