Thanks for the heads up on those GP2000's.

Where those cells connected with sollid bars or spotwelded?

Ryan, i think you need to find a balance in what amount of cells fit your chassis best. (15 each side would fit in perfectly)On 30 cells your able to blast your maxx the moon.

The 2240/8 will allready be a blast on 18-20 cells. (could be used up to 24 cells)

You could consider to try a Lehner Wanderer 20xl motor (feigao XL type, other bearings and i heard Lehner is also going to use different magnets as wel, though i don't know if this is true)

The 20XL 7 or 8 would work very well on 20 cells.

Just noticed them on bk's site, says the 20 XL can be run with the 2099 warrior!! $250 or so, or the micro 20120. The motor is only $130, yet the 2240 is $370!!! whats going on?

I may be offering the wanderer motors at an even lower price! Lehner makes the 2240 motors, and they are quite expensive. BK is having the wanderer motors made in large quantity (the motors are made by Feigao, but to BK's specs with German quality bearings and the like). I also can have the items direct shipped to you from BK, so you wouldn't need to pay customs charges like you would if I shipped them from here.

ok, so im thinking the cells we have covered. The motor probably a wanderer 20XL, Rene can you do the math and work out which turn I need to have the same KV as the bigmaxximum (theres a good chap). The other question is the controller? could I run that setup with my existing 16 cell packs? (slower obviously)

Bk is trying hard to blow the competition (hacker/schulze/plettenberg) away with this controller/motor combo. And they have got a strong card in their hands as well! MGM is also a strong player on the controller market, though not yet available in highvoltage controllers.

Well, your looking for more power, so i would use 18 or 20 cells GP3300's. I know it's attractive to go with 16 cells, and you could try that to see what's the difference.

how many cells do you want to use eventually? 24 GP2200's would take a 20XL 8 or 9.. (you need a 36120 controller, so you could use a some hotter motor (8XL) and it would run nicely on 16 cells as well. (slower than the bigmaxx though..)


On 20 cells (and the warrior 9920) the 8XL should do nice, but i don't know how Lehner feels about this. Perhaps Mike can ask BK about this..

The 20XL7 is rated by BK on 2145kv, and Feigao uses another way of measuring, they get a 2386kv range on that same motor. I know that some companies use the motor as dynamo and take the RPM's needed to reach 1V, Lehner measures the motor under load. (better imo)

you have confused me now!

the fiegao figures are not under load, the BK figures are under load i think.

I would stick to 20 cells i think.

The 7Xl would be about the same rpm range on 16 cells. A 9920 controller could take this for sure. (a user on this forum uses the 7XL on 18 cells in his maxx)

But is it worth the change? If you want more power, you need to use more cells!

Mike has got the feigao 7XL motor, thought they are about 90 dollars. Those wanderers are blue in colour, the feigao's are purple, but easy to polish blinging silver.

You can just try this motor on 16 cells in your maxx, you'll be able to loose it on ebay if you don't like it enough and you can buy a more powerfull one, with a beefy controller as well.

I didnt think you could run the feigao 7XL on 20 cells? i thought you needed the BK 20XL series.

The feigao 7XL is the same as the wanderer 20XL 7 (i heard)the only differ 200 rpm/volt, due to their other measuring, i assumed you could use the wanderer specefications with the feigao's


20 cells = wanderer 8XL and if BK thinks it's okay, you should be able to use the 9920 controller. I personally would use the 36120 controller. You have got the option to upgrade to 24-26 cells and the 2240.

And yes; Feigao measures without load, or they spin the motor and see how much rpm's are needed to reach 1 volt. Lehner measures the motor under load.

ok, so wanderer 20XL (8 turn)

I know the 36120 or 20120 would be best but they are twice the price of 9920!

Yes, if you want to use much cells, you just need to pay the price.. ;)

with 2200s your gonna get like 3-4 minutes of runtime.

Thewanderer motors are made by Feigao to BK's specs. The windings are the same from motor to motor, and as candyman said, they simply measure differently (Bk states rpm figures under load, while Feiogao states them unloaded). So, the wanderer 7xl would be the same motor as the Feigao 7xl, but with some upgraded bearings and a different color basically. The 9920 could handle the 8xl on 20 cells. The 30/36 cell controller also have a 42000 rpm limit, which will change the motor selection(9xl perhaps). The micro series controller also has a few more programming options via cable than the warrior series, but is a bit more expensive. 20 gp2200 cells will fit quite nicely in the g-maxx chassis as well, and will weigh less than the 16 cells you have now.

Not true. More cells with a slower motor will draw less amps and run more efficiently, so an increased runtime may even be the result under the right circumstances. The 2200s are slightly more energy dense than even the gp3700 (weight vs. mah), so with the same weight of these different batteries(more cells, obviously), there would be slightly more energy available, along with the increased efficiency/decreased resistance provided by the higher voltage.

I posted my brushless Revo utilizing the GP2200's back on 03.24.2005 here: Brushless Revo

I have run my truck on 18 2200's and 18 3700's with approxmately the same performance but the 3700's did seem to have a little more punch, not much though. I usually run the truck with 20 2200's. The 2200's last around 14 minutes under race conditions. I found that out the hard way because I was racing in a 15 minute A-Main against the nitros. I barely made it through the last minute but still took second place. Running 18 GP3700's, I get over 20 minutes of runtime but the weight difference is around 8 oz :eek:

My motor is rated at 18 cells, 1200 watt's and 2500 kv. The controller can handle 21 cells and I have been running 20 cells with no problems (heat or otherwise)

In my opinion, the 2200's are the best high voltage solution next to Lipoly.