Emmeth

I am building exactly the same combo but with 2600 mah hyperion.

Do you believe I will be able to run for a 10m race ?

BTW how do feel that combo ? Are you happy ? Sensations ?

Thanks in advance

stigno

I think you should do fine with 10 min on 2600mAh Hyperion.
I am happy with my converted MBX6. It is fast, runs smooth and powerful.
But I run a Hacker 1350kv motor, which is a 2-pole motor.
Should be fine with a Tekin too

Edumakated

iTrader: (19)

3000-3300 on 6s should get you 15 minutes pretty easily. I ran a 6s 2650 all of last year with the Tekin 1400 in my buggy. It is good for 10-12 minute mains and warm up laps easily. Running a 15 minute main on big tracks would be very iffy though...

Another good combo is 5s and the 1400kv motor.

bigben1165

iTrader: (9)

i agree, between 3300 and 3600 would be ideal for weight and power.

Muggydude

iTrader: (92)

May go 3000mah 40c for 6s


Will 4s 1700kv be enough for a large track? Will 6s be enough on 1400kv?

bigben1165

iTrader: (9)

the 3000 should work with the 6s, as for the track performance, someone that races more than i should answer that one.

Edumakated

iTrader: (19)

6s/1400 will have more power than necessary. You can tell how much power a car is going to put down by multiplying the nominal voltage Xs motor KV.

For example:

3s (11.1) * 2650kv = 29,000rpms
4s (14.4) * 2200kv = 31,000rpms
5s (18.5) * 1700kv = 31,000rpms
6s (22.2) * 1400kv = 31,000rpms

These are all roughly equivalent.

Most nitros run around 30-37,000 rpms and experience has shown that electrics also run most efficient in that range. The nice thing is even if you run less than 30,000 rpms you can always gear up to get the top end you want.

5s with 1400kv works very well. Only 25,900 RPMS but runs very efficient and just gear up a few teeth and it feels like any other setup. Same with 4s 1700kv.

Battery wise... 4s 5000 = 5s 4000 = 6s 3300 in terms of size and run time. As the voltage goes up, your batteries and ESC will run noticeably cooler. Motor temps will be the same regardless of setup as long as you are geared properly. Motor should never come off the track hot to the touch imho.

Muggydude

iTrader: (92)

That's the answer I was looking for! LOL I'm goiong to look around for some lighter batteries. A question: Do you think 6s 3000mah 40c is enough fro 1400kv C rating wise?

Edumakated

iTrader: (19)

Yes. As voltage goes up, the amps required to generate power are much less. As a result, you don't need high C rated batteries. When using lower voltage in 8th scale (i.e. 3s and 4s), you definitely want higher C ratings. Generally, for 6s I would say 30c is fine. If you are going to run your packs on the edge of capacity, I would say get higher C rate batteries too. For example, you have a 2650 pack and run it down to around 2500. A higher C rating will help the pack withstand the demands at near empty. If you are running a say a 3300 pack and only need 2500 to run X main, then the pack won't be stressed as much and C rating shouldn't be as important.

Muggydude

iTrader: (92)

sweet. What do you think would be a starting point for gearing on 6s 1400kv? Large outdoor tracks, one medium sized one.

Muggydude

iTrader: (92)

Also, as far as batteries. Which of the above ones would you choose? I want it to easily do 15 minute mains on a large track. I was thinking either the 3000mah 30c(507 grams) or 40c(522 grams), 3600mah 30c (577grams), or 3300mah 30c (544grams)

bigben1165

iTrader: (9)

i would go with the 3600 30C packs, if you want to make it easily.

stigno

I would start with 16T pinion on a 46 spur

bigben1165

iTrader: (9)

sounds like a good starting place

Pulse_

I run both 1350 and 1400kv tekin t8 motors with 6S 3300mah G3 lipos. I get 20 minutes runtime with the 1400kv on medium tracks. I'm a smooth driver. I'll try the same setup next week in a big outdoor track and see for how long I can drive.

IMO 1400kv motors are awesome if you're looking for range. You can even try 5S and a bigger pinion.

There are so much parameters that will influence range that it's hard to know how much runtime you'll get. As an exemple I always get about 5minutes runtime more than others. Might be because of my type of driving. I set my car so that it's very progressive and easy, I don't like my car to slide so I almost never push the trigger hard

Tips to get more range:
- light car (especially the wheels)
- low kv motor
- soft throttle and brake curves (or gentle on the trigger)
- good bearings, transmission has to be free
- good cut off setup (VERY important for the range, some lipos cut at 3,4v when you set them at 3,2v so better go for 3v max, the ESC will always cut higher)