cogging issue on a mamba max - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-30-2008, 10:30 AM   #1
thrash metal
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cogging issue on a mamba max

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i was having issues at fastcats with my mamba like superfly was. when i was heading down the straightaway i would have no throttle at all for a short period of time. it was like a delay in throttle response.

i updated my esc with the new new firmware and tried my t4 on the track again. i adjusted the deadband as low as you can adjust it and i was still getting the same problem with my mamba.

i have the mamba 5700 motor and i was running a 2 cell lipo. and the lipos i was using were maxx amps, orion platinum and a peak racing so i was using top quality lipos but still was encountering this problem.

i decided to try using my 3 cell lipos and it instantly got rid of the dead throttle response . now that im using 3 cell lipos in my t4 i havent had anymore dead throttle glitching . its running perfect now.

so anyone running a 4600 or 5700 mamba who is having similar throttle delay issues try out a 3 cell lipo.
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Old 01-30-2008, 11:21 AM   #2
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Thrash metal where did you say you bought that DX3R. Thanks.
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Old 01-30-2008, 11:29 AM   #3
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he got it at big boys with cool toys
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Old 01-30-2008, 11:51 AM   #4
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mamba's are real sensitive to low voltage...
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Old 01-30-2008, 12:10 PM   #5
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check your low voltage cutoff settings
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Old 01-30-2008, 12:36 PM   #6
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re low voltage settings

hey pipeous,

when i was running 2 cell lipos my voltage cutoff was set at 6 volts and now im running 3 cell lipo its at 9 volts.
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Old 01-30-2008, 12:39 PM   #7
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my spektrum dx3r

hey martin,

i bought my dx3r at big boys with cool toys. he gave it to me for 320 cash.

but way2fastcrz bought his at hobby home for 310 cash. both are good deals.

it lists on tower hobbies for 320 us plus taxes and shipping . so big boys gave me a sweet deal. ziggy355 bought one from big boys with cool toys when i got mine as well.
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Old 01-30-2008, 11:41 PM   #8
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kevin... try resetting the radio to the esc... (holding full throttle and turning the mamba on... etc etc...)

chuck is right though... more than likely its your LVC kicking in... try turning it off for a few min on a fresh pack and see if it still happens...
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Old 01-31-2008, 12:06 PM   #9
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Like Kevin said I was having the same problem about 10 feet down the straight at full throttle my mamba 4600 just cuts out for a sec...That was with my 3000 Lipos from maxamps that put out around 60amps...

Gino let me try his 5000 Lipo and there was no more problems...not one. And I've even set my Lipo cut off to NO CUTOFF...So I dont know what it is to be honest but its like the mamba ESC under high load just cant keep up the amperage and stutters...

I never had any probs at sids and i think thats because there wouldnt be the loads through the motor and ESC because there isnt the traction to put a high torque load on the motor...

I tired the reset of the mamba's FWD and REV endpoints and that didnt change anything for me. However if i turned my FWD end point about 20% down then I'd have no issues....

I also tried the 3 cell Lipo from Kevin and there was sooo much power the car was wheeling at full speed...there was no cut off issues at all with 11.1Vs...

QUESTION: Can you run a 5700u Capacitor on a Mamba ESC???? I'm thinking that might help but I've never heard anyone put on an optional one. And would you just attach it to the deans battery connector like a Novak Brushed ESC???
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Old 01-31-2008, 01:01 PM   #10
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i've heard of people who have been told by castle creations to eliminate the bullet connectors from the wiring and make the wires as short as possible between the motor and the controller to solve this exact problem. to date mine has only acted up very slightly with my very old 3300's.
before doing that, both of you should go over all your wiring from the battery right through the controller and to the motor with a fine tooth comb to make sure its solid. This includes your battery connection and
be sure to check your on/off switches along the way - mine completely failed the very first time it was exposed to dirt and locked on, so i simply removed the entire switch/wiring and just jumped the leads on the board so that its always on.
if you do end up finding a wiring issue and want to shorten your wires, be sure to use a kick-** soldering iron - one with a nice new large tip and a lot of power... castle uses stupid silver solder on its boards which makes it a bugger to de-solder the wires from the board.
Also, avoid the disappointment of burning your mamba's plastic case by removing the two screws and the case before you solder.

aside from all this, are you guys running spektrums? spektrums have their own lovely little problems with the connection between the upper and lower board on some of the older models, and could be a possible source of the problem, but not as likely as the other problems mentioned.
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