Increasing runtime:

Whats the best way to increase the runtime of a brushless setup:
IE;
Would 20 cell gp 3700's be better than say 4000mah lipos???
Right now im running 16 cells and im just considering more runtime+powah!

Cheers.

unless wired parallel, more gp3700 won't give you more runtime. But you will get more power.

[maxxdude1234]

Originally Posted by Superemaxx89

unless wired parallel, more gp3700 won't give you more runtime. But you will get more power.

Serum and I had a long discussion about this, and adding more cells can increase runtime if geared down - so that the truck goes the same speed on 20cells as it did on 16cells. But if the gearing is kept the same, runtime will decrease (but speed obviously speed will increase).

Swift, your best bet is with lipos (lighter, bigger capacity, no voltage sag under load)

[ygguB naM]

The li-po's give way better run time than nimh but you could get better li-po's than than that.

[maxxdude1234]

Geared down 20cells would give you slightly more runtime than 16cells. Personally I would reccomend saving up a getting a good set of lipo's (4000+mah)

Thing is though, with more Nimh cells, there's less load on each one, so runtime actually does go up. This would be the reason that guys running 18 GP2200's get about the same runtime as guys running 12 GP3300's.....up to 15 minutes or so.

EDIT: Maxxdude kinda said the same thing I was thinking........

Whats a really good lipo pack?

[MetalMan]

In case anyone is wondering why the runtime will decrease if you add more cells and don't gear down, it is because the motor will pull more amps due to the increased voltage.

any1 know what some really good lipo packs are?

[coolhandcountry]

Originally Posted by MetalMan

In case anyone is wondering why the runtime will decrease if you add more cells and don't gear down, it is because the motor will pull more amps due to the increased voltage.

Well I have ran 18 at 25 -30 min runtime. I have ran 20 with the same gearing and got 34 min runtimes. If you run 12 cells and it takes 1200 watts to flip the truck over you can hammer it harder. If you have 20 cells and it takes 1200 watts to flip the truck over you can only run a little over half throttle. If you can only turn the corner at 20mph and the truck runs 30 versuses 40 you are closer to wide open as well. Yes on paper it works out some times differently than on real life.

[MetalMan]

How much do you want to spend?

[virusss]

You council the 20 EVO Flightpower www.flightpower.co.uk

Thoses are only 3300mah, im was looking for 4k ish, and im looking to spend 600$ . But you guys know about lipo, so maybe thoses 3.3k packs are better.

a 3300 lipo would be better than a 3300 NIMH cells
also what currency are those prices in

Thoses are pounds. So you are saying these are some of the best packs out there?