How many watt's ?
 

Hi !

I'd like to convert a 777 or an x-rax 808 (or what's the name of the new x-ray-comp 1/8 buggy ? :) )

And use it for racing ! But i don't kow how mutch power i realy need ? is 1000w enough to be able to competet against the nitro's ?

maybe, maybe not. All the good .21 nitro engines seem to be putting out 2hp or more, which is about 1500W. So you looking at less power. But the power curves are very different (nitro motor is very peaky, electric motor is very flat, so you have the power available over a much greater rpm range), not to mention that an electric motor has much more torque from 0rpm. They're just two different beasts - power isnt the only thing you have to look at.

I doo agree with what Sammus wrote. 1500 Watt is about the maximum you will need.

But i also could spin all 4 wheels on tarmac with 700-800 Watt power system: video
With a better power system i could have outperform any nitro powered buggy (1580 Watt peak on this run): video

The maximum peak i recorded in my 10lbs buggy was 1800 Watt. And i do see power peaks of up to 2500 Watt with the same power system in my truggy.

So i would say: 1000 Watt could suffice (depending on the track and grip condition), but to be on the safe side shoot for 1.5KW max. It's always good to have more power and dial it down (ESC or remote), then not having it.

700 Watts is definately enough to compare to a .21... without a problem...

my 8S1P 2200 20C Lipo, and 12XL buggy... will smoke a nitro without a problem.. and that's only about 1300 Watts...

Like Sammus said, the torque/HP curve is totally different. Nitro engines may develop 2HP, but usually towards the upper end of their rpm range, and even then, this band is not very wide. Probably closer to 0.25HP or less at low rpm. And nitro engine torque is also low at low rpm, while BL motors have tons from 0rpm. This is what gives BL the diff ripping power and is so addicting. Different animals altogether.

Nitro engine ratings remind me of vacum cleaner ratings. They always seemed to be rated at the max power it could produce the instant before it melted/exploded!

Seems like a battery capable of about 1500 watts, coupled with a 80% eff. motor/esc combo works well for speeds around 40mph max.

If to belive EagleTree dat, my 10lbs truggy makes easily 1500+ peaks (I belive that more becouse measured current limited with 118.5A) and avarage power on track is about 500W. Its on 4S and geared about 35-38. And that nowhere near with nitro. Dynamics maybe 4-5 times better, like people said becouse of torgue/rpm curve