I'm going to use Traxxas vehicles as examples.
On a stampede you can mount one battery on the under side if you want to lower the center of gravity and a second battery in the original position for 2 pack action by using reusable zip ties like this .
If you want to cram 3 packs on the chassis you can do this plus one on the bottom .
On a Traxxas Rustler, Bandit , or Street Sport you can do 2 side by side also.
This also works on a lot of other chassis.
Now that you got a Idea on what to do with the batteries we need to stiffen the suspension normally some vehicles come over dampened to begin with so you may just need to adjust your ride height other's will need stiffer spring and shock oil. What you do is up to you every one likes there car to ride differently and there is no such thing as a perfect set up .
Now if your wanting to step it up a notch a motor swap is going to be in order .
my primary recommendation is the Thunder Tiger Super 19 Turn 550 size Brushed Motor parts #PD9221
It has replaceable brushes and spring's and the brush shunt's are removable on the one's I have seen so the commutator can be turned on one of the old stock motor lathe's.
Now why is this stuff important because it will all prolong the life of the motor make it preform better .
With 3 /6cell packs the motor will see a nominal voltage of 21.6 as a byproduct the motor will be turning at a much higher rpm than stock because of this higher rpm it may be a good Idea to run stiffer than stock spring's .The reason for this is to keep the brushes from bouncing and loosing contact with commutator when this happens you will loose peak rpm and power it also causes arcing that damages the commutator . If the commutator is turned in a lathe the surface will be made smoother and decrease the chance of brush bounce and may decrease the spring tension needed .
Some other high volt options are are high turn mod motor's and even some crawler motor's . like the one's shown below but for long life and max performance these should have the commutator trued with a lathe and maybe new spring's
Now you maybe wondering why I said high turn mod motor's . This is because the less turn's a motor has the higher the peak rpm will be . When the peak rpm climb's so does the maintenance mostly due to brush bounce and brush wear .
Now If you have the cash and time and want the best of the best I recomend keeping your eye's peeled for these guy's Trinity Monster Maxx (Mild, Wild, and Pro) and the Reedy Badd Maxx Mild motors. The Monster Maxx Milds are 21 turns, the Wilds are 19 turns, and the Pros are 17 turns. The Badd Maxx Milds are 19 turns . These motors are fully rebuildable .
More soon .
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