Need help/advice on my setup
 

Need some help/advice guys. This weekend while racing, I had a problem hitting the 15min mark for our A-main. I made it to 14 min and the LVC stopped me. I am wondering if I should go to a 4s 6000 mAh pack, buy a more efficient motor or some other variable I didn’t consider.

At the 14 min mark my pack had used 4508 mAh (confirmed this on recharge). I had zero warm up laps and plugged in the car at 30 seconds to start. I drove as smooth as possible and tried to avoid excess movements and speed where necessary. By my calculations, I would have needed 5152 mAh to run 16 minutes (would like a little extra comfort plus a warm up lap) + extra to not run the pack down completely. I am concerned the weight of a 4s 6000 mAh pack would be too much.

I just bought a new MBX6 for next summer so I know I will have some weight savings. Until that arrives and is built/shaken down, I am currently using my Kyosho mp777 WC.

Specs as it was raced:

Kyosho mp777 WC
Castle Mamba Max with lowest motor timing, no drag brakes
Neu 1512/2D/F
Neu 30C 5000mAh 4S1P pack
46t Kyosho Plastic Spur
car was geared to top out at 40.6mph with the 12T (quals) and 37.2mph with the 11T (main)

I was having such a good race too. I got tangled up early, worked my back up to 5th but ran out of juice. I need to finish these races and represent the flashlights better:rofl:

Maybe go down to a 10t pinion and see how that does? Sounds like your setup is drawing the battery resonably hard, as you are not getting full capacity when you hit the lvc. Was the battery cold when you started? If so try warming it up a bit before you race. May help!??!!?

Looks fine as a setup - Should be good with a 4s 6000mah...

I had to grind the can down just to fit the 11t. The Kyosho rear chassis brace is one of those blue hollow tubes and it is hard to do any grinding with that. Do you think the 10t will give up too much on the long front straight?

I did have the pack come off the charger a few minutes before race time.

Do you guys think I should go to a 2000/kv motor or is my 2600/kv fine at this point? I also don't know what I will end up gearing the MBX6, so I have to keep that factored in what ever I end up doing here also.

You should make it with a 4s 6000 pack, but over time you probably will degrade the pack and still have a problem. The issue is that the 1512 2d is a pretty high amp motor at 120amps. A great motor, but it is not efficient and good for longer run times. This is why a lot of people are switching over to the 1512 2.5d which only pulls 78amps and other low kv/higher voltage setups. You can EASILY run 15 minutes with a 2.5d on a 4s 5000 pack plus 1-2 minutes of warm up. You just need to bump the gearing up a tad to compensate for the lower RPMs but you will have a much more efficient setup.

I was running the 1512 1.5d on 4s 5000 earlier this year and could only get about 13 or so minutes. I switched to the 1512 3d and a 5s 4000 pack and can get 20 minutes of hard race time.

by switching to a lower kv motor youll get longer run time.

Can you fit a bigger spur in? I would try that so it'll give you some extra room to fit the motor.