Baja Bug

[diets]

Hi!

My first Mini-X Mod and what i have done so far:

Mounting the very popular Tamiya wheels.
Raised the Mini-X by cutting the suspension stops.
Changed the motor to a Topcad R2 Modified.
Modified the gearbox to increase the gear ratio.

Ground clearance is about 17 mm.

http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bajabug.jpg

Most of the modifications were described and discussed in this forum. So I have to thank you all.

diets - more mod's are waiting

[3series takumi]

pleaz show some pix of the chassis!

[diets]

Here are some more pic's.

http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbt1.jpg
steering

http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbt3.jpg
topview

http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbt2.jpg
sideview

diets - mini-x is maxi-fun

[Alexman]

can you tell us/me in detail what you did and what you bought please?

I'm new to this stuff,
-Alexman

[helldriver]

Originally posted by diets

http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbt1.jpg
steering

At pic #02, what is the combination of pinion and spurs gears do you use? I'm interested to that spurs gear.
Good job. man!

[Cian]

omigod that is FANTASTIC!!

I really love wht you did there, It's the most innovative X I've seen since takumi's!!!

Nice paint job too!

[diets]

@helldriver
I made the same experience as you did. I burnt my stock motor within 5 minutes driving with the monster wheels. :o
I am using 6 cells and a GM SX3R esc, which has no limit with 130 and 180 motors. So I decided to use a Topcad R2 Modified motor. I use this motor in the overland as well, and i think it is one of the best 130 you can get - comparing price and value. It is fast and has a lot of torque.
Going 4 wd with a standard 130 motor means modifying the gear box and changing the motor mount - but "how to".
I had the same idea as you, using a main power shaft with a pinion and spur gear combination. My pinion gears are from the overland or hpi micro. I have them from 9T to 13T. The spur gear is from a cd-rom drive with disc changing mechanic. The diameter was perfect to fit on the drive shaft without changing/cutting the chassis.

Overall gear ratio is 12 : 1

pinion gear (motor) 9 T
spur gear (power shaft) 25 T
pinion gear (differential) 8 T
differential gear 35 T

The ratio between pinion and spur gear is 2.77 (25T / 9T), which is near to the ratio 2.67 (34T / 12.7T) calculated by "Hooters Driver" in your "get my motor burnt" thread ;)

I did not change the pinion gear yet, because the car goes pretty good, almost to fast :D


@Alexman
Here are some thread's for you:
raising the chassis http://www.tinyrc.com/forums/showthread.php?s=&threadid=13599
power shaft http://www.tinyrc.com/forums/showthread.php?s=&threadid=12707
tires http://www.tinyrc.com/forums/showthread.php?s=&threadid=13880

Maybe i will make a "how to?", if there is enough interest. But i have to do more real offroad testing, to be sure that everything works well. I already changed the steering, cause i broke two sub-micro servo. Now I am using a Hitec HS85 with metall gear and a servo saver from the Hpi Micro. I hope that this combination performs better than the one shown in the pics. But something else will break - i am sure :o

@Cian
Thank you.
But, most (if not all) of the mods i have done, were already posted in this forum. I had some of the ideas too, but the posts of the "mini-x masters" help me a lot - especially in avoiding mistakes. So the honor is not on my side. Maybe with my next mod ;)


diets - 6T pinion gear and hill climbing is no fear

[3series takumi]

what electronics are you using, and can you post a pic of your motor mount

[diets]

@3series takumi

receiver: jeti rex 5
esc: gm purple sx3r
servo: hitec micro servo hs81MG (in the pics you see the my first attempt with a sub-micro servo - not recommended, will break)
http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbelec.jpg

The motor mount consists of two aluminium bars. Screwed to the chassis at the position where the on/off switch normaly should be. I have drilled two holes in the motor case and cutted "Gewinde" (i don't no the correct english word - "holes" for screws), as they are in bigger (180, 300, 540, etc.) motors.
http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbmotorf.jpg
http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbmotors.jpg
http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbmotorb.jpg

The shape of the aluminium parts are modified for a perfect fit to the chassis and the motor.

diets - it look like some more polishing is necessary

[3series takumi]

you are the man. i hope you dont mind, i need to use that type of motor mount on my next mod. looks like it will work perfect

one more question for you, where did you get the 5chan receiver from. that thing looks leet.....i could add an extra servo to raise and lift the x. Hit Switches!!

[diets]

@3series takumi
The motor mount works, you should try it. The only problems is, finding a spur gear that will fit.

I have got the receiver from my LHS. In my country it is available in 35 and 40 Mhz. Attention - it is a FM receiver.
Here (http://www.jetimodel.com) is homepage of the manufacturer. Raising and lifting - that's cool. I will use an additional servo for my 4x4x4 project.

diets - got 2 new mini-x today

[diets]

After breaking the servo gears the second time :o
I decided to improve to whole steering concept :confused:

must haves
A Bigger servo with metal gears and ball bearings
A servo saver

http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbs1.jpg
Hitec HS 81 MG as i use in my HPI Micro RS4
http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbs2.jpg
with HPI Micro RS4 servo saver
http://dieter.kornprobst.bei.t-online.de/Mini-Rc/minix/bbs3.jpg

diets - hopes that it won't break anymore :rolleyes:

[3series takumi]

dude that is one leet steering setup, i would do the same if i had the room. a servo saver would be nice

[diets]

I have enough room.

I had to put the esc and the receiver on top of the battery pack. I needed some extra room, where the esc and receiver are usually placed, because of the big tires.

So now, there is plenty of room for a real big micro servo :D

diets - to steer or not to steer