Re: speed controller for fisher price
 

The reason I said what I did is because I know that the traxxas XL-1 I believe I saw that can handle up to 150 Amps, and with how light the cars are I figutred they must be turning somewhere close to the free speed RPMs. I just figured it would have drawn more current then I thought.

BTW, andy have you ever seen a 4 turn motor on a lightened chassis take off? ;) It could prolly keep up with a 3.3 and deffinately atleast 2.5. Not that I have one yet but I am getting there.

Also what kind of motors were you using wen you finally got it to go that fast?

Re: speed controller for fisher price
 

There is a big difference between the typical FP motor and a hobby motor. In most cases, the hobby motor is going to offer a higher top speed. The FP motors seem to be more hardy and torquie. Lacking dyno or any spec sheets for hobby motors this is a purely subjective rating.

The retrofitted cars where never as fast as the nitro car in a straight line. They did however do much better in turns and overall ease of handling. The great fun of them was that at nearly all throttle positions under 100%, snapping it into full throttle would break the tires loose on pavement. This allowed for some impressive controllable oversteer and drifting. The Violator on the other hand is a big, heavy pig when turning. The power is impressive but it tends to slog through turns and isn't nearly as nimble or easy to 'toss around'. One day I may suddenly get better with her, but I'll have to fight for every bit of speed out of her. The electrics just worked.

There are on road cars that could beat the snot out of anything I could make on a paved track. But those cars can't take off on a grassy yard or on a dirt road either.

The fastest we ever got a car came from using the dreaded 6 volt FP motor from a few years ago. We ran it at 14.4 volts and had a blast. I think it eventually died or dropped off in performance, but man did it scream. That motor worked well because it's RPM range was right inline with a normal hobby car, so the gearing was all being used. A normal 12volt FP motor is way under geared and tops out at about 30mph, but will tow a van while it's at it.

-Andy A.

Re: speed controller for fisher price
 

i've tested the dewalt motor with a victor we had and my 2 channel radio and receiver and it works beautifully. i'm going to order a victor soon.
what would you suggest for batterys a drill pack, 2 stick packs, lantern battery?

when i ran it with one 7.2 volt pack the power drop killed it so i couldn't acclerate then i tried a 12 volt battery and this thing'll wheelie right over i bet

Re: speed controller for fisher price
 

Try putting 2 7.2 packs in series to creat 14.4 volts. Or maybe a 8.4 volt pack if you have it. Atleast if you get everything in the car then the hardest part will be done.

Re: speed controller for fisher price
 

Anything less then a 9 volt battery pack will be useless to you. Even then you will probably have a lot of brown outs.

My first choice is two 7.2 volt nicad packs in series. It's heavy, but the performance is great and you'll have at least 15 minutes of run time. The packs are inexpensive on ebay and easy to charge. James and I used to use a DeWalt smart battery charger with some leads, so if you have one of those you are set.

We still use our packs, although we've since bought an easier to use charger. Right now the packs are used to run the chamber fan on our cannon, but all our cars and 'bots are set up to use them. It's nice having a bullet proof power source for all our debauchery.

A drill battery pack works, but it'll be clumsy. If you just want to try the car out then it's a great way to get things running quick. Otherwise, invest in some battery packs.

And remember- Calibrate that Victor!
-Andy A.

Re: speed controller for fisher price
 

thanks for the info guys i'm ordering a victor and have figured out where everything will go on the car i'll post some pics when i finish.
i've also decided to do 2 7.2volt packs in series from your recommendations

i've made an structural modification adding some aluminum to strengthen the shock towers.
i still also need to make a bracket for the drill motor and get the right gear on the motor. Any idea how to take off the old gear off? it doesn't want to budge so i may just press an aluminum collar over it and work from there.

for space purposes i will be taking the fan off of the victor but its in a position where there will be lots more airflow than the fan could provide so it should stay cool.

aren

Re: speed controller for fisher price
 

If you want airflow around the victor, cut the winshield and side windows out of the body.

To take the gear off the fisher price motor you will need a gear puller like shown.

Also I looked at the specs for the fisher price motors and they seem to have 15,000-16,000 RPMs so in the tranny get as small of a ring gear as possible and get as big of a gear for the motor as you can. I know that an 11 turn motor has somewhere in the range of about 27,000 RPMs so considering your car probally came with from a 20-27 turn if you gear it up as much as possible it should beable to hopefully burn out.

Take pics of everything.

BTW I dont know what kind of transmission is on a OFNA car but on my traxxas Rustler it uses mounting holes on the motor case. so if it does mounting should be EASY because from the comparisons I have done they RC motors and the FP motors seem to have similar if not the same case.

Re: speed controller for fisher price
 

i've uploaded a picture of the car witha victor 884 and two 7.2 volt packs on top the receiver and the batteries will be under the aluminum right now i'm still working on it it burns out no problem