4.5 vs 5.5 mah usage

[DaveG28]

Ok clever ooplers, I am using SP v3 motors, and currently use a 5.5 in my 4wd. It's taking @2100mah out of my LiFe cells, with gearing to recover top speed then my esc set to a lot of punch to recover that side. However, I still need a bit more speed to get back into Lipo territory, my options are:

1. Go up one more pinion and then set mega everything esc punch. My temps are not as bad as I expected using higher gearing, will the lower LiFe voltage save temps or am I being lucky so far?

2. Put a 4.5 in to recover the speed. If I do this and run equivalent gearing to currently (probably take 2 teeth off the 5.5 gearing) can anyone roughly estimate (just rough is fine) what mah I am likely to take out of my cells given currently I am taking @2100??

Thanks all,

Amish!

[MattW]

I'd be surprised if you got up to 3000 - you'll be fine on LiFe.

When I tested a 3400 Life in touring car with a 3.5 I got 4.30 before it went flat.

[GRIFF55]

4.5 Amish, YOU PUSSY!!!! MAN UP!!!! (thats revenge for the jesus comment somewhere mate!) lol

[colmo]

Does anyone know what the kv ratings of the 5.5 and 4.5 are?

For roughly equivalent performance, you'd be looking for:

7.4 x (5.5T kv) = 6.6 x (4.5T kv)

Higher voltage is more efficient and generates less heat, but its not a huge difference here.

[DaveG28]

Originally Posted by MattW

I'd be surprised if you got up to 3000 - you'll be fine on LiFe.

When I tested a 3400 Life in touring car with a 3.5 I got 4.30 before it went flat.

Do tourers use more or less power?

My LiFe is only 3500, so may be a bit on edge!!

[MattW]

I'm sure you'd be fine with a 3500.

[suthers]

i know 4.5t is roughly 5000kv

[colmo]

Originally Posted by suthers

i know 4.5t is roughly 5000kv

Not too sure about that - that's more 7.5T territory, I think.

I checked the Novak chart; the 5.5 Ballistic is 7400kv, the 4.5 is 9000kv, a 21.6% increase.

Presuming the SP v3 winds increase in similar increments, going down a wind should more than make up for the 12% drop in nominal voltage from lipo to li-fe