TwistedxSlayer 1290 Posted September 25, 2014 Afternoon all, Having an issue with my TB-01 at the moment. Currently it's got a Mtroniks 11x2 motor with a Viper RV11 ESC. Running both a 3300Nihm and a 4600NiHm with a Flysky Rx. When I drive it nicely and slowly there is no issue, how ever when I give it full throttle, the car cuts out, and the ESC cuts out giving the impression its low voltage. I've been told the motor is drawing too many volts under full throttle. My question is.... Why has it starting doing this? Both batteries are brand new. I can't afford to go Lipo or BL. How can I remedy this issue ? Thanks in advance. Dave Share this post Link to post Share on other sites
IBIFTKH 1369 Posted September 25, 2014 It sounds like your motor is drawing, or trying to draw, more amps than your batteries can provide. I don't know if you have the option to fit a smaller pinion gear on the TB-01 but that would be worth looking into. It would cut your top speed but improve acceleration and make it a bit easier for your motor to spin up. Is the timing of your motor adjustable? If it is, running less advanced timing will lower the current draw. If that doesn't work or can't be done, you probably need to look at a tamer motor. An 11T is a bit of a beast, maybe a 15T - 18T would be more suitable. 1 Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 25, 2014 It's running a small pinion for rapid acceleration anyway, I don't use my car for its top speed. It's been running 11t for a long time. I don't know if it is adjustable timing. Before I started running 3300nihm, I was only using 3000nihm, 2400nihm and 1800nicd. And never had an issue. Share this post Link to post Share on other sites
SteveU30 1011 Posted September 25, 2014 What connectors are you using at a) the battery to ESC and motor to ESC? Share this post Link to post Share on other sites
super gripper 419 Posted September 25, 2014 Fit a power boost capacitor. Problem solved. 1 Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 25, 2014 Deans from battery to ESC, and bullets from ESC to motor. Share this post Link to post Share on other sites
SteveU30 1011 Posted September 25, 2014 Should be fine with those connections, sounds like Super Gripper's suggestion is the way forward then? Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 25, 2014 Very possibly. Where would I find said item? Share this post Link to post Share on other sites
Percymon 2184 Posted September 25, 2014 Hobbyking have them for a couple of quid. There are larger capacity items on eBay at 8-10 times the price also. Share this post Link to post Share on other sites
Percymon 2184 Posted September 25, 2014 http://www.hobbyking.com/hobbyking/store/__16223__TURNIGY_Voltage_Protector.html select your local warehouse for correct pricing and shipping 1 Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 25, 2014 Thanx Percy Share this post Link to post Share on other sites
alfagta 126 Posted September 25, 2014 i think this is the type of boost cap super gripper was meaning , http://www.rcmart.com/keyence-op87520-super-power-capacitor-p-37055.html , could be wrong Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 25, 2014 Ordered one off eBay. By the time I'd paid shipping on hobbyking, it was working out more expensive. Share this post Link to post Share on other sites
alfagta 126 Posted September 25, 2014 Ordered one off eBay. By the time I'd paid shipping on hobbyking, it was working out more expensive. did you get an RX cap or an ESC cap? Share this post Link to post Share on other sites
super gripper 419 Posted September 25, 2014 Ok chaps this is what you do. You buy the one from Hobbyking or one that looks the same. You DO NOT plug it in to the receiver, you cut the plug off, solder the red wire in to the battery positive about half an inch from the esc. Solder the negative the same, half an inch from the esc. Job done 1 Share this post Link to post Share on other sites
InsaneJim69 1583 Posted September 25, 2014 Power capacitor attached to the receiver would do the trick with no issues. Very common issue with low turn motors. Its actually the receiver 'browning out' not the esc. the esc drags the current from the motor and the receiver then doesnt have enough power to power itself and it temp shuts down. I bought 2 from local maplin store for 49p each. If you pm me your address i can send you one pre attached to the proper connector for the receiver mate. Edit ...... just realised you bought one. James Share this post Link to post Share on other sites
super gripper 419 Posted September 25, 2014 I disagree but there you go. Share this post Link to post Share on other sites
alfagta 126 Posted September 25, 2014 Ok chaps this is what you do. You buy the one from Hobbyking or one that looks the same. You DO NOT plug it in to the receiver, you cut the plug off, solder the red wire in to the battery positive about half an inch from the esc. Solder the negative the same, half an inch from the esc. Job done i thought the same , but , is it browning out the RX or is the esc going into cut off ? which is why i asked the question rx or esc cap , ;-) Share this post Link to post Share on other sites
InsaneJim69 1583 Posted September 25, 2014 Dont getme wrong it may well be the esc. But i have never had an esc cut out like that not straight away. The esc would get hot first then it would thermal. I have had to run a receiver capacitor in my trf415 and my trf502 race cars as the receiver would brown out under full throttle. Its an unbelievably common issue. But fitting to the esc wires or the receiver has the same effect for helping the receiver. as the receiver draws current from the esc so fitting one to the escwires will still power the receiver under full load temp. Same as fitting it to the receiver directly. I have one fitted directly to my rx as we speak in the db01r to solve the exact same issue. He has bought it anyway, so least he try itplugged into the receiver and if that doesnt work, snip the wires and attach to the esc wires. James Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 25, 2014 Erm, I'm not sure which one it is. Rx or ESC cap. The ESC is defo not getting hot enough to thermal cut. Share this post Link to post Share on other sites
InsaneJim69 1583 Posted September 25, 2014 Its the same capacitor bud, just fitted in a different place When it arrives try just plugging it into the receiver and it will solve the issue, if not then snip the wires and attach to the esc wires to be sure. The ones I got from Maplin were 4700uf 12V ones, but does the same job. James Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 25, 2014 550000uf is what I've ordered. Should defo not have an issue with a voltage drop Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 27, 2014 Plugged it into the receiver. Not cured it. Share this post Link to post Share on other sites
alfagta 126 Posted September 27, 2014 Plugged it into the receiver. Not cured it. the issue you are having is nothing to do with the RX , as you said in the OP , its voltage droop from the battery at max current draw , as the batteries are new i would suggest they need waking up or are just not up to the job for that esc motor combo , try the cap on the esc and see if it helps a bit , i suspect it will only partially fix the issue , for the rv11 to cut out voltage must be dropping below 4v at max current draw , if that is the case then your packs have major issues , i have had similar issues when i used a cheap transformer based charger like the base level wall warts and some of those old school items sold by fusion hobbies etc , they killed individual cells in the packs , if you have a volt meter you can check voltage of the battery right after charging , it should be around 8v or more , anything less suggests a problem and all the caps in the world wont solve it , good luck with the cap , hopefully it will solve the issue . Share this post Link to post Share on other sites
TwistedxSlayer 1290 Posted September 28, 2014 How would i 'wake' them up? Had a multimeter on it this morning. 6.5v in the battery. Motor is drawing 1.5volts under 3/4 throttle and i cant get it to give a reading even for a split second under full throttle. Need to charge the battery and retest it when its fully chatged to see if all the cells are coming up. Share this post Link to post Share on other sites