looks as if there is a giant booster rocket atached to da chasis of the Zip.

OK... details please:

- is this a modded zz?

- where did you get the wheels?

- how much?

:-)

if remember corectly they are tires from a f1 slt car or somthing i think

Sorry Steve I am an electrical enginear and I was just giving you the math equation to design the charg and discharg characteristics of a simple RC circit.

:confused:


Gruder

It's a Zip with AFX GForce Slot car axel, wheels, and tires (had to drill a little as the rear axel was bigger, and ground clearance is next to nothing). The AFX kit was $6.00 which came with the rear axel and tires. The front are AFX and they were $2.00 for the wheels and tires. The body is from www.scaleauto.com , which by the way has everything slot car. The big arse thing on the back is my homemade turbo module that adds second battery voltage after an adjustable delay. I bought everything I needed to make it from the Shack for under $10.00...and things like resistors came in 3-5 packs so if you fry one when soldering no biggie. So far I've got about an extra $20.00 and countless hours into this silly thing, but the fun makes it worth it.

hehe thanks, I got the theory behind it, and my boss actually took it from there, though I got to thinking and once the turbo kicks in, simply pulsing the throttle SHOULD reset the timer circuit and drop the voltage back down to 1 battery..kind of a down shift. I'll have to get it running to see if a decay circuit is really needed, and if one could actually fit.

LOL...thats next!

Amazing work Steve; we've promoted this thread to Bit Science!

Good cause I need HELP!
 

Ok, after coming so far...I've hit a stumbling block! Unless I'm wrong, I need a relay to switch between one cell and two cell operation. The timer in the turbo module trips the relay, that sends the second battery voltage in series to motor. Releasing the throttle, resets the timer, which causes the relay to fall back to one cell.

HERES THE PROBLEM. The only relay small enough that I could find is 5v. I found that 3volts will actually trip it, but even with two cells, once the voltage drops a little from running, the relay won't work anymore. What I need is either a relay that runs on less than 3v (can't find them), or some kind of other method that I can't figure out.

If anyone has any ideas, please let me know.

i don't know if this is the right realy but i found this

hmmmm
 

That's pretty close, unfortunatley at 1 1/3 inches long, it's almost longer than the chasis of the Zip. Though, I guess beggars can't be choosers.


Thanks

how?
 

http://www.electronic-kits-and-projects.com/3044.htm

this guy has this kit that you can build, that comes with a 12V relay, but when 1v is applied it triggers....how did he do it!!??

So, where do you put the 'Flux Capacitor'...? :D

Nice work! I invent electronic mods and add-ons for real cars, so it's different to see people adding to postage-stamp sized vehicles! Keep up the good work! -Brian

Re: how?
 

Oh, to answer yoyr question: The relay coil is still energized by 12vdc, he is passing current through the collector-emitter junction of the transistor. A generic NPN transistor will pass enough current to pull in a 'standard' 12vdc relay coil when the base-emitter junction voltage is around .850vdc. It's a very simple schematic:

dam....nice idea and nice work...too hard for me to even think about:D...u control when u hit the turbo rite?...u also need a BOV(blow off valve ) for that ZZ now:D :D :D