layman's mod- 5 cell- 6 volts- VIDEO
 

As suggested in a response to my 4 cell mod in my zipzap I have tried a 5 cell mod in another zipzap. (same body of pt crusier though) I have the same pcb swap from a fitracer as well and even same 23,000 rpm motor. The only difference is the frequency and that I left the stock blue gears in. I need to try the red gears when I get a chance. Anyways this mod would be the ultimate mod excecpt for the run time.

Runtime
Its runs for about a 1 and 30 seconds. But the last 30 seconds the batteries are really being drained quickly.

Handling
I noticed everything that was said about this mod about the car flipping over less and handling better (in the video I was still adjusting to the speed). I also think that since its not heavy like my 4 cell mod http://www.tinyrc.com/forums/showthr...&threadid=7120
its definally accelerates faster and has a faster top speed than then my 4 cell and even with the blue gear on this car. The 4 cell has red gears.

Modifications
I did not even have to make any solder connections with this mod. All I did was purchase those batteries and bent then to fit.


I originally had tried to use the whole 6 cell pack (7.2 volts) but once I had charged them the car did not respond to the controller. I believe that the chip on the pcb has some sort of safety to shut off if a certain amount of volts goes throught it. I made sure these was no shorts and then connected the pcb wires to a single 1/4aaa battery and the car immeadly responded. I guess I have to find some sort of mini relay if I want to go over the 6 volts. If you have any ideas please let me know.

Also if you got a faster car post a video so we can see it.


Here is the link to the laymans mod by sessiz10

http://www.tinyrc.com/forums/showth...=&threadid=6045

Now here is the video of the run with this 5 cell mod

http://members.aol.com/buycompuparts/5cell-1.wmv

Was encoded and you may need divx to view it . download it at divx.com.

internal pic of car

finally an internal close of car

Looks like you cannot see the batteries behind the two front ones because of the electral tape. If you try this mod on a zipzap there are two batteries in the front and two directly behind it. Finally the last one is bent upwards laying flat.

Thats proper quick.:D

looks cool

I was looking around the forum and found this link http://www.geocities.com/wdiaz03/minidragster.html . I havent spoken to this person but seems like he really knows his stuff. He has bypassed the pcb to push more volts to the motor directly using a transistor.

How's the body shell holding up on that thing? You know, since you are running into the wall and stove at about 25 mph! Very nice speed; are those batts rechargable, though, or do you have to toss them every time?

Now that's the speed Zip Zaps should go. I think that PT Crusier body needs a custom paint job. :cool:

Thanks. Yeah the body does need a custom paint job. I only choose the pt crusier since it had a little more space than any of the other bodies I saw. The bodies are surprisely strong.

This is actually one of two pt crusiers that I own. They both have multi battery mods. The other one has a 4 cell 1/4 aaa.

The batteries in both cars are rechargable. The one in this one uses the smaller button nimh batterys that were refered to me by the the laymans mod. I found out that the allelectronics place the sells them are only minutes away from my work.

I am now working on bypassing the 6 volt barrier that I ran into by using a transistor the was used in the dragster link that I posted.


Does anyone have a good way to measure the actual speed of these little cars? I wish it went 25 miles per hours but I dont think it does. I thing a jump from 2 to even 20 is impossible with that mod I did?

I did the 3 cell and the zip has amazing speed. Try using a turbo or lower motor. The blue motor runs at 3.0 speeds with this mod. The only draw back I've had was run times of about 5 mins the last 3 slowed down. The weird thing is that if I let it sit for a minute the voltage is back for another 1-2mins, I haven't figured it out yet. What I plan to do next is bend up another 3 cells and attach them parallel to the others and see if I can't get a 3.6v 80 mah bat;) That should take care of some of the run time issue. I think this has got to be one of the best mods out there, easy and worth while.

jpaustin what motor are you running in that.Does the motor get hot

I just found out its only a 21000 rpm motor, the red one. And I havent noticed the motor getting hot at all. Well I only make like 3 runs in a row max.