4 or 5S in a D8 conversion?

[maneba]

Hi, I'm plannig to built a D8 conversion, but i'm not sure about the motor to buy.
I'll use the car in a 1/8 track.
The question is about performance (due to battery weight) and running time.
What do you suggest me between these two setups?

Neu 1512/3D F (1700 rpm/volt) with a 5S or a
Neu 1512/2.5 F (2050 rpm/volt) with a 4S?

1512/3D + 5S should be very energy conservative but i'll have more weight than a 4S.
Otherwise a 1512/2.5 + 4S should be a little energy hungry.
So?

[magman]

It is personal preference IMO. Are you racing or having fun? For bashing 5s. For racing, 4s is really all you need, however, the higher voltage set up will be more efficient. (A 4k 5s set up is the same as a 4s 5k batt. ) Plus if racing w/5s, you always have the extra there if you need it. The drawback to the 5s set up is the added weight. You really cant go wrong with either set up.

If running 5s, you can find some batteries that are lighter to help save weight. Good luck w/your choice!

[RC-Monster Mike]

5s doesn't necessarily mean more weight - a 4s 5000mah pack has the same energy and weight as a comparable 5s 4000mah pack - with an appropriate motor and gearing selection, the total performance will be the same as well - both systems motored and geared for the same performance will perform similarly and have similar runtime. The higher voltage setup should have a slight gain in efficiency with a lower current draw if all else is equal.

[rootar]

and with the lower current draw also comes a cooler running esc and batteries.