[SuperFly]

As mentioned above, the boost cars get their two speeds not from altering the voltage, but by micro-stuttering the power going to the motor. That said, the net result of a dual-cell boost car is that the unboosted mode feels about the same as a single cell car. I've never done any measured tests, but I do have a couple dual-cell boost cars. Unboosted, they drive around about like a single speed bit with a decent motor, then the boost looks like when they hit the NOS button in FnF.

In your post above, the statement that unboosted voltage is .9v is incorrect. It's still getting 1.3 volts, it's just alternating on and off a couple times per second. You can hear it if you listen closely.