2200kv MMM

[nick8155]

Hi Everyone,

I have a Losi 8Te 2.0 and just converted to brushless and i love it!!!!
My club runs 20 minute mains and i am reaching 3.0v LVC at 17 mins, everything is turned right down on the ESC.

Battery is a HYPERION G3 VX-35C 6500-4CELL LIPO
Gearing is 13/45 ATM - The track is quite short with not alot of WOT.

Would a 5cell of the same capacity last longer?

Regards

[brushlessboy16]

Originally Posted by nick8155

Hi Everyone,

I have a Losi 8Te 2.0 and just converted to brushless and i love it!!!!
My club runs 20 minute mains and i am reaching 3.0v LVC at 17 mins, everything is turned right down on the ESC.

Battery is a HYPERION G3 VX-35C 6500-4CELL LIPO
Gearing is 13/45 ATM - The track is quite short with not alot of WOT.

Would a 5cell of the same capacity last longer?

Regards

gear your truck down so that you use full throttle.. more efficiency at WOT.

With 5s your going to need to gear down regardless to make up for the extra rpm

[Chadworkz]

More voltage + lower gearing = higher efficiency (longer run-times).

[nitrostarter]

Do you really think 5s is needed? 4s should be PLENTY on a short track.

[shaunjohnson]

Originally Posted by Chadworkz

More voltage + lower gearing = higher efficiency (longer run-times).

that's my philosophy.
i run 6s through my revo with only 40mph gearing and i'm pushing 30+ mins of race pace

[nick8155]

Thanks,

Starting to understand a bit more now!

I will see what the runtime is like with a 12t pinion

[nuz69]

Hum, keep in mind that higher voltage means higher RPM so higher losses in the motor bearings.
But for heavy trucks like truggys or MT, with the 2200kV, 5S with small gearing is the way to go, maybe on 6S the motor loses a lot of efficiency in the bearing...
A 1520 1Y on 6S should give you better efficiency anyway...
Brushlessboy, I would have a question : The efficiency at full throttle is best for the motor or ESC ? Or both ?

[Chadworkz]

Originally Posted by nuz69

Hum, keep in mind that higher voltage means higher RPM so higher losses in the motor bearings.

I don't think you are grasping the whole point, or understanding what we are talking about...

When you go UP in voltage, you also go DOWN in gearing, resulting in the exact same RPM & Top-Speed as before...just with higher voltage.

So, going with higher voltage does NOT mean higher RPM since you are going with lower gearing at the same time. RPM remains the same with higher voltage and lower gearing, but the efficiency and run-time greatly increases.

[nuz69]

No kidding
Read again what I wrote, I talked about MOTOR RPM, not transmission RPM

[Chadworkz]

I just realized that we are talking about the same thing, just in two different ways...my bad.

[Chadworkz]

I just realized that we are talking about the same thing, just in two different ways...my bad.

[shaunjohnson]

Originally Posted by nuz69

Brushlessboy, I would have a question : The efficiency at full throttle is best for the motor or ESC ? Or both ?

if you are at half throttle the fets must turn on and off a lot to "limit" the voltage in laymans terms.

but at WOT the fets only need to shunt power to the 3 phases and that's it, no more in-between-phase-switching.

[scooterboy]

Hi I'm running a 2200kv 1515 1Y motor in my converted lightning stadium pro, 14t pinion 5800 4s lipos with lvc at 3.2 the finals where i race are 15 minutes and unless i nurse the car i hit the lvc at 14mins. I'm only touching WOT for a split second on the main straight, would gearing lower help (i ran a 15 tooth 1st time out and hit the lvc at 14mins 30 seconds but had a 4 lap lead)
punch is 75%
timing 0
start power low.

would a 1800kv 1512 1.5Y be man enough for a truggy as i have the chance of getting one for a good price and would this give me 15 mins at full race pace(with the same 4s lipos). (tbh its won every time i've used it but i would like to be able to run at the same pace as the heats in the final)

cheers

Darren

[nitrostarter]

Originally Posted by scooterboy

Hi I'm running a 2200kv 1515 1Y motor in my converted lightning stadium pro, 14t pinion 5800 4s lipos with lvc at 3.2 the finals where i race are 15 minutes and unless i nurse the car i hit the lvc at 14mins. I'm only touching WOT for a split second on the main straight, would gearing lower help (i ran a 15 tooth 1st time out and hit the lvc at 14mins 30 seconds but had a 4 lap lead)
punch is 75%
timing 0
start power low.

would a 1800kv 1512 1.5Y be man enough for a truggy as i have the chance of getting one for a good price and would this give me 15 mins at full race pace(with the same 4s lipos). (tbh its won every time i've used it but i would like to be able to run at the same pace as the heats in the final)

cheers

Darren

Why not run the 1518 1800kv? I run this in my 8ight-Te. Plenty of power and runtimes are great! I can practice with a 5000mah with my LVC set at 3.3v for 18-20minutes of track time. Motor temps at about 120F at max. Everything else is below 100F

[nuz69]

No. A 1512 1.5Y will short your runtimes if geared for the same speed, because it won't be efficient at all in a truggy. The motor is too short. The runtimes don't depend of your motor, unless its undersized, but of your voltage, your gearing and the weight of vehicle.
To increase runtime you need to increase efficiency, if you cant change your motor, you need to up you voltage and reduce the gearing, to keep the same power and reduce current.
More over your timing is not right for Y windings. Best efficiency with the 2200kV 1515 1Y motor is 4-5, not 0.

==>Try first to reduce a little your pinion, set the correct timing. Punch at 75% is good, you don't need more power at start.

A Castle 1518 1800kV will be more efficient in a truggy on 4 or 5S, and the 1520 1Y 1600kV on 6S with low gearing would be the best solution ever to have insane runtimes, but I do not know if the rules permit theses motors...