Dual motor setup

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I’m far from an expert.. But it all depends on the setup from my understanding. Not typically something you should attempt unless your well versed on the subject. 🤷‍♂️

Are you trying to build a speed runner?
Does dual motors help make the car go faster? Or is it the same?

Some RC's use one motor on each axle to achieve 4WD without connecting driveshafts, but those tend to be on the cheaper side since this simplifies the design significantly.

Given the availability of motors in every size and configuration, it's almost always lighter and more efficient to go with one bigger motor instead of 2 small ones when driving a single powertrain.

The other reason apart from power to go dual-motor is for weight distribution, since you can make your design symmetrical.

Dual motors are also less practical in the brushless era, each requiring their own ESC, while you could run multiple brushed motors off a single, larger ESC.

There are modern RC's with dual-motor options, like the Rlaarlo AK-787 or a 1/16th budget brand truck that I'm forgetting the exact model # of right now.

The discontinued Traxxas E-maxx had a dual brushed motor setup, but a single brushless motor is more than enough to power one of those now.
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Dual motors will not add speed. They do add torque which can then be leveraged into running bigger pinions/smaller spurs, which can then make a rig go faster. Assuming that your setup has the space to allow for bigger pinions. It's also not ideal because the two motors will never spin at exactly the same rates, so you lose some efficiency from the two motors having to fight each other somewhat.
Totally agree with Grey. If you take your current motor and add a second one, it will not be any faster. That is unless aerodynamics or drivetrain friction is holding you back from reaching the max RPM of your motor with your current voltage (note: your motor will likely be overheating already if this is the case). But it can be a useful thing to do in the right situation. Let's say you want a certain RPM out of your motor to reach a certain top speed. If you run a motor in an RC that has way too high a KV, it will put a strain on the motor, causing it to overheat. Adding a second motor will share the load and allow you to reach a much higher RPM. So technically no, it will not make your RC faster by just adding a second motor. But running dual motors will allow you to run much faster motors and or taller gearing.