2speed+2.4v=???

[urbandork]

First off 2 speed and boost are the same thing right?
From the searches of other threads and the reading of them thats what ive come to figure.

I know that the 2 speed/boost application limits the amount of juice that goes to the motor. When the boost button is pressed the full amount of power is applied.

My question is if i put 4.2v in a boost set up will the first stage/boost half the 2.4v to a stock 1.2v and then have a second stage working the full 4.2v

or would chip only reseist the first speed up to .6v (half of stock 1.2) and the second stage/boost punch out whatever remains, not reseisting any thing whether it be the stock 1.2v or a modded 4.2v

[tatsboy]

well...i think that in a 2 speed BCG with "booster function" the current is pulsed to the motor instead of being stepped down through a resistor. So in reality the motor is only on for half the time. When the boost button is pressed, then full current is supplied to the motor so you're only limited to how many batteries you can cram into a chassie. There are also mods for an anti-boost function, where instead of using the boost button for speed, it is used for half speed. In that setup the car will then run at full speed until the button is pressed.

Try the Bit Science Section of this forum for more info

[urbandork]

Yes ive read that article on inverting the boost function. Infact i was thinking about doing it if i do get a boost set

my question is how much power will the motor get when unboosted and unboosted if i where to run 4.2v through it?

I know that when running the stock 1.3/2 volts the unboosted amount to the motor is .9v and the boosted is the full 1.3v. I was worried that even if i ran 4.2v on a boosted car that the unboosted power would still be the .9v and the boost function would limit the boosted power to 1.2v

[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.

[urbandork]

thank you very much. Your post was super clear.

thanks to all

[SuperFly]

Glad it was helpful. I did make an error in my statement, though. Where I was talking about .9v vs. 1.3v, I'm not really sure how many volts are actually getting to the motor. The dual cells (1.3 + 1.3 in series) put out around 2.6v, but the PCB alters the voltage and I've never measured what actually goes to the motor. Bottom line is the same, though: the boost function does not modify voltage.