GeeForce

Hi everyone,

I'm new to brushless and lipo's, and I recently baught a T4.1 RTR to start racing.
I want to buy a few lipo's, but I dont want to buy the wrong ones.
The two lipo's I baught: 5000mah 25c and a 5700mah 25c.
The advice I need:

1. What would be the right size( mah ) lipo, if I would want to upgrade to a
faster brushless system?
2. How does the KV and turn work on a brushless motor (what does it all mean)?
3. What brushless system would be recommended for the truck I have?
4. Are 7.4v the only lipo's used in a 1/10 race?

Thank you in advance.

rcduder

those lipo's would be just right for any brushless system those will most likely get u an hour or more run time but what u might want to boost up if you want a lil more punch is the C rating (continuous discharge rating) im not totally sure how the kv rating and turn thing actually works all i know is the lower the turn the faster it will be and the kv will be higher. if you were goin to race i would recomend a good sensored system like the novak kinetic spec systems or the tekin rs systems. and yes the 7.4v are the only legal lipo for actual racing in 1/10 scale off-road. hope this helps a lil bit

ToxicBanana

iTrader: (3)

2. How does the KV and turn work on a brushless motor (what does it all mean)?

RPM Per Volt.
lets use two motors in this example, a 2400kv motor and a 3800kv motor, at 1volts the rpm of the first motor will be 2400RPMs and the second one 3800rpm, as you raise the voltage you will get more RPMs.

A 2400kv motor vs a 3800kv motor both at 7.4Volts(2s Lipo).

2400*7.4=17760rpm
3800*7.4=28120rpm

Now lets boost the voltage on the one with the lower KV

2400*14.8(4s)=35520rpm
3800*7.4=28120rpm

As you can see above both the motors Kv and the Lipo are important factors for what RPM you are going to see.

GeeForce

Thanks you guys,

This does certainly help alot.
What would be a good C rating?
I've seen lipo's with as much as 150 c ratings, would that be necessary, think
they would cost a house load of money.

Cpt.America

iTrader: (52)

Answers in red.

GeeForce

Awesome info, thanx.

Can brushless motors be mixed with different esc's?
For example: a Reedy motor with a Novak esc.

GeeForce

Something I forgot to ask was:
Cpt.America you said: going to be racing at your local track's stock class, they probably run 17.5 motors

What turn motor would you recommend for mod class?
Is turn speed or power?

RatsacK

iTrader: (21)

A lower turn motor will be a lot faster but won't have as much torque. For a beginner, you probably don't want too much motor. Start with something slower, get used to the power and handling, and then work your way with a faster motor. So many newbies try and get a fast motor and keep spinning out (previous experience )

And yes, you can mix and match motors/ESC's (normally a lot of people do anyway).

Cpt.America

iTrader: (52)

When geared properly, a lower turn motor will out accelerate and out top-speed a higher turn motor.

Stock Motor = 17.5
Mod Motors = typically are 8.5, 9.5, 10.5, 13.5 for 2wd off-road

How hot of a motor you run depends on your skill level, It sounds like you are brand new, so I wouldn't run more than a 13.5. Unless you are running on some massive 8th scale track or something, it should be MORE than enough power until you get better.

Cpt.America

iTrader: (52)

Usually, yes. Most sensored systems can run any sensored motor. I am not aware of any that can't.

Dave H

There is one sensored exception if I remember correctly. The first Novak Havok ESC I think it is requires a heat sensor signal from the motor to be available, thus only worked with Novak motors, if others very few. Believe Novak quit doing that in later and and current Havok versions (Pro, 3S, SC, etc??).

GeeForce

How can I see or find the turn number on my motor?
The motor is stock and didn't come with a full manual as specs are
concerned, mind you I don't think you can call it a manual.
It's a Reedy 3300kV brushless motor.


Thanx for all the replies it's been a BIG help.

RatsacK

iTrader: (21)

If you're allowed, I'd just use the stock electronics until you feel you need better. When I used that combo, it felt very smooth.