Help me go faster...
 

First off, thank you for all of the sound advice thus far. My 1/16 E-Revo has made multiple 73mph runs with the current setup. I'm running a Neu 1112/2D, EZRUN 60A, on 4S. I have tried G3 VX 35C 1800mah packs and Zippy Flightmax 20C 2200mah packs, both yielded the same top speeds. I believe I am at terminal velocity, or very close to it, as adding another 100 feet of run space isn't making a difference. I am able to get the same max speed with 43/45 or 47/45 gearing. I've added some weight to the nose of the truck and it's quite controllable now. To be honest, I'm somewhat surprised that it did not go faster. So, now I need to decide what approach to take to go faster. It seems clear to me that I am running out of power. I'm considering upgrading to the 1115 motor and possibly moving up to 6S.

My question is this...is higher voltage always going to be faster, assuming you have a motor optimized for each voltage? Looking at the configurations Neu offers, how would you compare an 1115/2D (2600kv) on 6S to an 1115/1.5D (3500kv) on 4S or even an 1115/1D (5200kv) on 3S. With these combos, I could run the following battery configs: 6S-1600mah, 4S-2200mah, 3S-3200mah. The 3S would be a parallel setup and should have a very high current capability. I'm really looking for a max speed setup here. So, what's gonna bring me the big speed numbers? :smile:

its hard to say as you didn't list the "c" rating of the proposed batteries.

it's also hard to say because without an eagletree or similar data recorder we have no idea how many amps you are pulling.

6s (22.2v) at 100 amps is 2220watts(100a x 22.2v) which is about 3hp (743w = 1hp)

is your ez run capable of 6s operation?

if so- 6s at 60 amps is 1332 watts, close to 2hp

the math for the batteries is such- example: 6s 5000mah 20c (20c x 5000mah = 100amps) (100amps x 22.2v = 2220 watts) 2220 watts available

I'm gonna go look at the neu motor chart and see what else I can figure out for you

Yes, especially for speed runs.
The more partial throttle you use, the less efficient the ESC performs.
Properly configured high voltage setups will run more efficient thus allowing one to obtain higher speeds.
If you are only concerned with speed runs then you can get away with using a high voltage airplane ESC like the Castle HV85 or similar HV ESC
A 12S 800mAh setup should provide the big speed numbers

an 1115 only offers an additional 200w burst output over an 1112. I think you are near the limit with 11xx motors, but would certainly gain incrementally with an upgrade.

If you're serious about going fast the tenbol mount linked to above and a 540 size motor seem to be your best bet.

I was trying to avoid the Tenbol and 540 sized motors just on general principle. I may have to cave though...

As for the ESC, if I had to go up to 6S, I would need to get the MMPro when it's available.

just stick a mmm on there. its would be a tight fit though.

Yes, get the Tenbol mount along with a 1412 motor, or a 1512 motor. 1900watts and 2000watts surge respectively. I think that is about all you can put through the 1/16 anyways, IMO.

The issue I'd have with the 1512 or 1412 is the 5mm shaft. Can I get big 48p pinions for a 5mm shaft?

How would a 1/10 VXL (3500) do, compared to the 1112 I have now? I have one just sitting here, if it's even worth the trouble.

5mm shaft 48p gears available here: http://kershawdesigns.com/

don't bother with the vxl 3500. Its an "s" can feigao and good for no more than 700watts

wow we are talking 1200+ watts in a thing that is less than 3lbs ! wow. dont expect the drive shafts to last long

this guy installed a mmm/2200 combo in his.
http://radiocontrolzone.com/showthre...=254858&page=5

So, how would this work out?

• Neu 1512/2D (2550kv)
• Mamba Max Pro
• 2 - Hyperion G3 VX packs in series (3S 1600mah 35C/65C)

It should fly

And this should be faster than a 1512/1D (4875kv) on the same packs in parallel? This wouold make the battery setup 3S 3200mah 35C/65C, which should have twice the current capability right?