randy racer

i just finished my new Mugen MBX6 with the Tekno conversion and a Mamba 2650kv brushless system. everything has gone ok so far and the buggy handled like a mbx6 should but i am not getting the run times i am looking for. i am running zippy 4s 5000mah pack with stock mugen gears and a 12 tooth pinion and the best run i have had so far was 14 min. i have tried 9 10 11 tooth pinions and still the run times are to low. any ideas?

randy

micrors4guy

iTrader: (50)

I believe that is about right for run time for that motor. if you wanted longer run times you should have gone lower KV and higher cell count.

randy racer

when rechargeing the batteries i am showing 5500 mah to charge so the batteries are putting out more than the 5000mah they are rated for. some of the other guys running the same motor and batteries are getting over 15 min but i only average between 12 and 14. is there a battery rule that limits the mah? i was told that a 4s pack could only be 5000mah but i have not seen this rule in print anywhere. the reason i am asking is i plan on going to a race out of state in a couple weeks and the main is 15min and it would be nice to finish

randy

Thopper

With stock gears using a 14t pinion 5c5000mah flightmax ,nue 1850kv I can get 20 minutes during race conditions.

mwiley

iTrader: (14)

Hey man, just a little heads up here. If you are putting 5500 mah back in the pack then you are risking damage to your packs. You need to use the 80% rule. For a 5000 pack you should not have to put back in no more than 4000 mah. Also make sure you set the LVC correctly, because it should of cutoff before then. I run the mamba with the 2650kv in my Losi 8 and after 10 min I put back in around 2500 mah. Make sure nothing is binding and the gear mesh is not too tight. Also on high traction tracks your going to use more power.

wallot

2650kv motor on 4S = huge amp draw = short run times.

with lower kv motor you might be able to get 15minutes

in my truggy which is heavier i get 15 minutes on 5S 5000mah 1700kv Neu motor
and by 15minutes i mean hard racing

joelwhite

iTrader: (60)

Ive also leared to be a little bit gentel with my trigger.Gained a bit here with run time.Not 2-3 minutes like you are looking for but at least a minute and a half.Wheelspin eats juice like crazy.

Dan

iTrader: (74)

I run a 2650kv motor and the same 5000mah Zippy Flightmax 30C pack. I can make 15 mins easily. Then again, my track is small and I drive fairly smooth.

Try lowering the timing and increasing the punch control. It should help a tad with run time.

Edumakated

iTrader: (19)

15 minute main with that motor is going to be tough. You might make it if you get a 4s 6000 pack. If you are going to run 4s, get a 1700kv, 1850, or 2050kv motor. You will still have enough to pull nitros and should be able to run a 15 minute main at most tracks.

jmcvicker

iTrader: (2)

I'm going to use 2x3S1P packs in parallel. Basically 6-cells but 11.1volts vs. 4 cells. That will do a 15 minute main with full 2650 power enabled. You can probably go 15 Minutes with Throttle EPA dialed back to about 90-95 with your 4S1P.

You know, 4S1P is said to be "way too much" voltage for the 2650. Have you considered the 3S alternative? 3SxP lipo with 13 or 14T pinion. I've run one race with 3S1P 13T and have another 3 3S1P packs on order. Once setup in parallel, they'll be able to discharge at "60C" which means you split the amp draw from both batteries - lowering capacity drain. Castle says the 2650 is a "maximum 4S" motor, so you're using the most cells they recommend.

I got 11 minutes before stopping on my own last weekend with 3S1P - Zippy 30C here myself and it's as fast as Nitros with that battery.

randy racer

thanks for all of the info guys, it looks like i need a different motor. i ran a friends 2200kv mamba tonight and it was doing better i think but the rain set in a stopped my run. i bought the 2650 because a few of the guys around here are running them. i am a nitro head and have a lot to learn.

jmcvicker

iTrader: (2)

You can do a different motor or try to work the 2650 with the 3S2P idea I mentioned. Either way, you'll find the right setup. I think I've read enough of the threads here to see that many guys who are running 1/8 have been through lots of different setups.

I'm going to try to get through at least one season with the 2650 using 11.1 volts and maybe jump on that new 1900 that Castle is to release. But that'll mean more new battery setups. 1900KV with 4S1P should be a pretty standard setup for most tracks - while you can go 1600KV 5S1p and 1300KV 6S1P as other alternatives. Lower KV + higher voltage = longer runtime and less heat. I still think the 3S2P setup may be pretty fun with a 2650.

Armaan

iTrader: (49)

Nice! When are they coming out with the 1900?