Need help with my G3-build

[suicideneil]

1. The pro gears are truggy ratio, which means you would have to use a much larger pinion/ smaller spur than normal to get the desired gear ratio for any given speed; normal buggy ratio non-pro diffs only need a pinion 1 tooth larger than compared to the normal emaxx diffs. Get the non-pro ones.

2.

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 66
Pinion Tooth Count: 20
Total Voltage: 18.5
Motor KV: 2300
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 3.3 : 1
Total Ratio: 18.79872 : 1
Tire Circumference (inches): 18.06 inches (458.83 mm)
Total Motor Speed: 42550 RPM
Vehicle Speed: 38.72 mph (62.2 km/h)
Effective KV Value: 2300

Assuming the BM is ~2300kv, been a while since I looked it up. Think its more like 2600kv, but that would give you ~43mph on the same gearing, which is pretty reasonable for that setup- 40mph is plenty for bashing or racing really (you didnt specifcy what you would be doing with the truck).

http://www.scriptasylum.com/rc_speed/_top_speed.html most useful tool ever, thanks to BrianG.

3. Tough call- I use 2x5s in parallel on my rig for extra runtime and less stress on the lipos (Zippies, love em to bits but a safety margin is always good with cheaper lipos, regardless of brand). If you went for smaller 5s lipos, say ~3700mah or so, then 2 in parallel would be perfectly fine,- still half the weight of nimhs with much more power output and runtime. A single 2s and 3s in series is fine too, and useful for use in other vehicles, just be sure to get ones of the same specs (just different voltages obviously).
Anything able to output over 100amps is fine (e.g. 5000mah 20c), but for a hungrier motor like the BM, over 120amps is better (e.g. 5000mah 25c).

Look into the stuff Mike sells as his own branded lipos (RC-Monster), or anything from rclipos.com (Enerland based cells).

Just dont fall into the maxamps trap, or we'll disown you...

Welcome to the forum.

[JoFreak]

Thank's a lot!

1. But if I were to run a centerdiff or slipperential with sth between 40T and 46T, i would need the pro-diffs? Am I getting this right?

2. Sorry forgot to tell you what I'm going to use it for. But to be honest I don't really know yet. Presumeably "soft-bashing" until I decide if I start racing it or not, most important right now is that it wipes the floor with the nitro guys' cars round here
I have no idea on the kV of the BM, couldn't find anything on their homepage as well.

3. But.... but they (maxamps) have cool flames on their batteries!!!
Just kidding, I'm most likely going for some high-quality batteries from a, sort of, local shop.
5S; 5000mAh; 30C/55C; 2C charging; 650 grams; 164x47x48mm; ~190€ (should be about 260$ I think)
They did very well in several tests, better than comparable Kokams for example because they keep their voltage on a high level untill they are nearly empty. Combined with the LiPo-savers from the same shop this apparently works very well.
I would give you a link, but it's all in German (hey, stop hating me ) and, as you've probably noticed by now, my english isn't that good so that I could translate the website, not to mention the tests.
I think I'm going to wait what the truck's weighing when finished and then I'm going to decide whether to go for 2S + 3S or 2x5S.

4. (Anoyingly not the question No.4 I forgot while typing my first post) Anything speaking against the 17mm wheel hubs from traxxas? (5353X)

5. Neil, thank's a lot for your help so long and for the welcome

[Sammus]

Originally Posted by suicideneil

1. The pro gears are truggy ratio, which means you would have to use a much larger pinion/ smaller spur than normal to get the desired gear ratio for any given speed; normal buggy ratio non-pro diffs only need a pinion 1 tooth larger than compared to the normal emaxx diffs. Get the non-pro ones.

I'm not sure about this. I have a pro 2 evo and it has standard buggy ratio, but all the gears are a different metal, some kind of special hardened steel or something comapred to the normal ones.

Hardened Diffs
Diff pinion
Diff ring gear

Notice the 'standard' and 'option' part listings.