Need some advise for changing from brushed to brushless

[stebedford]

Ok, so I know about the different types of brushed motors and esc's out there at the moment but when it comes to brushless I havent got a clue, at the moment im running a 15*3 brushed motor, I do want to change it to brushless, but no idea what the different types are, whats the difference between the number and stuff? what speed controller and lipo would I need for brushless motor, ive seen people talk about 8.5 motors but still no idea what the difference is between an 8.5 and 13.5

If anyone could shed any light on it I would be greatful, and also any suggestions for any cheapish/beginner brushless setups would be great

[CBRDEAN0]

Originally Posted by stebedford

Ok, so I know about the different types of brushed motors and esc's out there at the moment but when it comes to brushless I havent got a clue, at the moment im running a 15*3 brushed motor, I do want to change it to brushless, but no idea what the different types are, whats the difference between the number and stuff? what speed controller and lipo would I need for brushless motor, ive seen people talk about 8.5 motors but still no idea what the difference is between an 8.5 and 13.5

If anyone could shed any light on it I would be greatful, and also any suggestions for any cheapish/beginner brushless setups would be great

Very approximately - If you divide the brushed motor wind by 2 - you end up with about the same brushless.

IE 13 turn brushed is approximately a 6.5 brushless.

[stebedford]

so a 8.5 is faster than a 13.5?

[danDanEFC]

Originally Posted by stebedford

so a 8.5 is faster than a 13.5?

Yes the lower the number the more powerfull the motor is.

[Big G]

ezrun systems are good value for money from ebay. they usually come with a 8.5T and run well.

[super__dan]

Originally Posted by CBRDEAN0

Very approximately - If you divide the brushed motor wind by 2 - you end up with about the same brushless.

IE 13 turn brushed is approximately a 6.5 brushless.

That's a bit too generalistic I think as a 6.5 is way quicker than a 13 IMHO, though lipo skews it slightly.

8.5 = 12 or 13 turn
7.5 = 11 turn
6.5 = 10 turn
5.5 = 8 or 9 turn

If you want something the same ish speed as the 13 I'd go with an 8.5.

A 10.5 I think is suppossed to be roughly equivilent of a 19t motor

[saintnitro]

i got a ezrun 9t in my losi xx and it flys and i've had no probs with mine

Ginge

[stebedford]

Originally Posted by Dizzie

ezrun systems are good value for money from ebay. they usually come with a 8.5T and run well.

what esc would i need with that? and lipo?

[saintnitro]

it comes with the esc have a look here http://cgi.ebay.co.uk/eZRun-V2-9T-43...4.c0.m14.l1262

its where mine came from

Ginge

[paulc]

are these BRCA legal

[niggs98]

perhaps look in the second hand section and buy a recognised name (lrp/nosram/tekin/novak) then you will get a product that people will be able to help you with as they have more knowledge on those products.

motor wise dan has already said about and if you are running a 15x3 now then a 8.5 will be more than enough for you.

when considering lipos then look at the c rating and mha rating as well. the higher both of these numbers are then the more grunt your car will have. hence most people using a 7.5/6.5 motor in 2wd at a national level but then using monster lipos to get the horsepower they need. with the 8.5 motor perhaps go for a 25c rated 4000-5000 mha lipo so it remains smooth and easy to drive like your current package. motors again use the names mentioned above, they are used by a lot of racers so will be in good supply second hand if needed.

for lipos look at trackpower/orion/vampire (there are loads of makes available). ive tried to remain unbiased to what i feel is best as they are all much of a muchness. some warrentees are better than others on the speedos so make sure that what ever you buy has a good one

[stebedford]

Hmm ive now seen some brushless motors with a KV value (eg 8000kv) instead of a turn value? Whats the story with these?

[i4n]

If the motor is showing a Kv value it will be a sensorless motor (and as such needs to be used with a sensorless ESC) - the Castle Creations Mamba/Sidewinder are sensorless motors.

Sensorless tends to be cheaper but can suffer from cogging (stuttering) when starting off or at low speeds which is where the sensored ones are smooth.

[stebedford]

so im guessing the higher the kv number the faster the motor?

[i4n]

Yep! The higher the Kv the faster the motor.

You can also find the Kv rating for sensored motors (the instruction booklet will list RPM/Volt or something similar).

[migsy]

the best sensorless to get is either a 5700kv or the 6000kv.
i used a mamba7700kv in my losi and totally destroyed my gear box.
for me i've drawn the line with a 6000kv as i need reliability these days.
hope this helps.

[stebedford]

Cool, 1 more thing (for now), will a 7.5 or 8.5t be ok for my DF03 Dark Impact? or will it be too fast/slow?

[F1END]

Should be OK, but I'd recommend getting a slipper-clutch for it to save your drive-train from too much damage.

[stebedford]

already got 1, it came with pretty much all the hop ups you can get, just need to find a new gear cover and a new shell for it

[Si Coe]

Will you be running it at the Bury Metro club?

The track there doesn't really need mega motors so something like an 8.5 in a Dark Impact is fine. The Ezruns are the best sensorless option - Mambas are great, but cost nearly as much as a sensored system so aren't worth it in my mind. The Ezrun 8.5 or even 5.5 if you feel bold are ideal for a DF03.
Come along one Sunday, theres a couple of us there can show you one in action....