Max Torque Mod
 

I just completed a mod that I will call "MAX TORQUE". This mod is to raise the current limit to the motor. There are two resistors (R2, R21) that are on the bases of the transistors that drive the motor. The stock ones on my Honda Civic where 220 ohm. I replaced these with 100 ohm resistors to increase the maximum torque available to the motor. It now takes off faster and doesn't get stuck as easy. Give it a try!

Hi Tony,

A few questions for you...

1. Where'd you get the 100ohm resistors?
2. Do you have a clearer picture, the current one is blurry?

thanks.

The resistors that need to be changed are marked in this picture.
I don't believe you can get SMD (Surface Mount) resistors at radio shack, you would have to find an electronic supply store. They are very inexpensive.

Alright then, where'd you get YOUR 100ohm resistors? Do you have a link to an Electronics Store?

thanks.

any drawbacks noticed so far? shorter run times? More motor heat?
Thanks

From my experiments with those resistors, I found that current continued to increase to the motor the smaller resistors I used. Actually, I shorted them and I didn't notice any negative side effects (other than only 4 minute run time) and I would have left it that way but I replaced the transistors with mosfets. The voltage from the IC dropped when I shorted the resistors and hence didn't destroy the transistors. In any case, that 100ohm mod is much better than leaving the 220ohm resistors.

I got my resistors from an old hard drive.

Tony, you mind if I stick this in the FAQ?? I'll wait until a few more people try it before it goes in though, we need some more results.

That would be cool.
 

Sounds good to me

Alright, I'll probably try this out this weekend. I'll just jumper mine though, as putting a new resitor in goes against my philosophy of "Cheap, easy and fast".

I shall retun with pics.

http://www.markhannahsurplus.com/resistor.php

they have them, they are number RK73H2A1000FT

cost each is $0.02 and they have 3500 of them.

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http://www.electronics-plus.com/Merc...ry_Code=NT1206

They also have them, at about $0.89 each

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good luck all.

2 cents? Sheesh, that seems excessively cheap. Why not just order 50 of them then and not bother with the change?
:D

is this for a zip or a bit?

ZIP

You said that the smaller resistors you use the better the results(speedwise only). I was wondering, what if you just leave them out. Will it work still?

Thanks

If you leave them out the car won't run. If you short them out (ie 0 ohms) it will run but there may be risk of burning something out.

stupid zipzaps are just useless!:eek:
lol jk but I jus like ma bit:rolleyes:

They must have put them in there for a reason in the first place. Maybe over specced though so as a backup??

Dave

how do you install it
do you just pull it out and stick the new ones in

You have to use solder. I take a heavy piece of wire, wrap it around the iron tip and make a much smaller effective iron and tip.
I am looking for surface mount LEDs also, if anybody has any sources.
BAE

Holy Cow! Good idea. I have so many old HDs it is not funny.

I know my resistor color codes BBROYGBVGWGS,
but can someone help me identify SMD resistor values?

Thanks

you can go here to get surface mount leds http://www.toyeast.com/
i bought some i'm just waiting for them to get here:D and do you know some one that can help me with my bad 3.8 motor it died this weekend it will still go but the car needs a push to get moving i don't know whats wrong with it reply if you know anyone that can help

Thanks for the tip on SMD LEDS. I think that they are a better idea.

For DarthRacer, No 3.8 motor can be high speed and torky at the same time without being designed for running times about 30 seconds or less. NiMH would be absolutely mandatory. You may fix your problem by seating the motor, Chap Sticking the gears, and polish and graphite lube the rear axel. I hope that this helps. Also a DansAm body is smarter for the 3.8 due to their lightness. BAE

:confused: how would i seat the motor? and what is a dansam body and where would i get one? if you know where i can get one let me know okay thanks for the helpful advice.:)

will this work on a dual 150mAH mod car?

You carefully align the motor by inserting tiny shims. Toilet paper is good for very small changes. Paper for thicker.
Tiny sells DansAm bodies. BAE

FETs! What was the part number of the FETs you used? I was thinking of doing the same thing, but FETs require a higher "turn-on" voltage than bipolar transistors. And since the supply is only a single cell, I canned that idea. The Zips can sure use a better H-bridge circuit!

Anyone know if this can also be done for Bits?

fury, if you have a bit, do my 3 cell mod. you'll smoke the zip like that. fet upgrade comming soon. i will now hack into the pcb board and give you the results :D

Since you are soldering anyway.
How about a Bit circuit board. Give it both the FET and 3 cell mod. Put it in a Zip shell so the 3 batteries are all inside. BAE

Can you just use a RadioShack 100ohms resistor?

whats is a FET and what does it do? I'm fairly good with electonics but never heard the term fet before. Its probably an american thing ;)

I used some computer resistor now.

???
 

how do u make a rear spoiler and also how do u make or where do u get a body kit to lower your car ive done all of the modsavalible already for:bdrop: but i have a zip zap and the ground clearance on the body is still high i need a bod kit:confused:

hey maby there should be a live chat on this site
:D

ppleasse!
 

please if any one knows were i can get a fast and furious upgrade for my zip zap or would like to sell me theirs
please send details to ilyakoch00@go.com please!:(

Can you do this on a 2 cell zip???

BTW, Do you know of a motor that has more torque than the zz control 1.0 motor?

removing resistors
 

i have an old harddrive but how do you remove the resistors off it and the zz board?:confused:

yyyyyyyayyyyy!

im geting a mini z mercadese its hot im gettin it friday from losangelos hey people are thode things cool?:) :) :D

hey how do u put one of those pictures under your screen name please

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