JSR

iTrader: (18)

In the pursuit for more runtime, I'm looking to change my truggy setups to 6s. What would be the better setup on 6s?...1350k or 1550kV?

1350kV on 6s is just shy of 30k rpm.
1550kV on 6s is 34.4k rpm.

- Would there be a significant runtime difference between these two setups on the same battery?
- Would the 1350kV have enough power? Would there be a noticeable power difference between the two such as on acceleration at the low-end and also as you approach top speed?

My concern with the 1350kV is that it may not have the power at the top-end (as in acceleration may seem to slow a bit). Both will be geared appropriately for the same top speed. I'm sure the 1350kV would run cooler and longer, but would the difference be noticeable?

Thanks.

rwhisen

iTrader: (4)

I am running the Tekin 1350kv on 6S. Very, very happy with the set up in both my truggy and buggy. Lots of power and it is geared to be just as fast as any nitro on the straight (14/46). Remember that races are not won on straight-aways. You'll see some more top end on the 1550kv but I don't think it will be that noticeable but it will cut into your run time.

JSR

iTrader: (18)

Thanks rwhisen. That's what I'm trying to get a feel for...the cost/benefit ratio. If I'll only see a 10% improvement in top end at the sacrifice of 20% runtime, I'd rather not do it. However, if I see a 20% improvement in top end and sacrifice 10% runtime, then it may be worth it. The top end is more for when I'm bashing. On the track, it's not that big so I'm not too concerned about top end then.

Edumakated

iTrader: (19)

I run the 1550 on 5s in my truggy and it freakin awesome. By far the best setup I have ever tested and believe me I have tested damn near everything over the past two years. very long run times and I don't think I have ever temped about 120 on the motor all summer. I run a 15 minute main and only put 4100 back in the pack on a pretty big track with my truggy. I have the same setup in my 808 buggy and it is even more efficient since there is much less load on the motor. I don't think I put much more than 3300-3500 back in after a 15 minute main with my buggy.

I also have a 1350kv that I run in the truggy on 5s and it isn't nearly as efficient as the 1550. My last race I had the 1350 in my truggy during quals and I changed it back to the 1550 because the 1350 was burning too much juice that I was afraid I wouldn't make the 15 min main. I put nearly 2000mah back in after the quals with the 1350 versus about 1400 with the 1550.

I just switched over the 6s for my HB ve8 with a 1400kv buggy motor and expecting to run a 10 minute main on a 6s 2600 pack.

Voltage is your friend. Much much better run times and smaller packs.

JSR

iTrader: (18)

Great info edumakated. Sounds like the 1350kV on 5s wasn't spinning enough to get the truggy moving enough, or was spinning at an rpm that was far enough away from it's nominal range thus consuming more current to push the truggy load around relative to the 1550kV. I think the 1350kV on 6s should be right around where it's operating efficiently. It would be at 30krpm vs. 34.4krpm with the 1550kV.

jmcvicker

iTrader: (2)

Sounds like you should look at your main length. If 20min then 6S+1350KV is probably best to guarantee you don't use up the full mAh in the battery. Plus, the extra cell is always more runtime - may even make 30min with that configuration.

JSR

iTrader: (18)

What would the downside be with the 1350kV/6s setup? Or phrasing it another what, what advantage would the 1550kV/6s setup have over the 1350kV/6s?
Would the 1550kV have more power?

v1r killer

iTrader: (8)

do i have this right . will i get about the same run times 2200 on 4s 5000 and a 1700 on 5s 5000 but the 5s will run cooler because of the extra voltage.

Edumakated

iTrader: (19)

No, the 5s 5000 with a 1700kv motor will run longer than a 4s 5000 with a 2200kv motor. The 5s 5000 pack has more energy in it and the 1700kv motor is more efficient (consumes less mah per minute).

Generally, when people go up in voltage they reduce the mah size as it is no longer needed. Put another way:

4s 5000 = 5s 4000 = 6s 3300

Typically, 4s is used with 1700-2650kv motors, while 5s is used with 1500-2050kv motors, and 6s is used with 1300-1700kv motors.

Ideally, you want to keep your RPM range at 30k rpm which you find by multiplying your pack voltage by the motor kv. So 1550kv x 18.5 volts = 28,675 rpm.