ultimate rally car. would you want it?
 

hey guys, i have been thinking about making the ulitmate bit rally car with 4 wheel independent suspension and 4 wheel drive. i have it all drawn out on paper, I just need to get the right parts and make it come alive. so who would be interested in buying something like this if i could actually make it work. and is 4wd worth it, or should i just scrap the 4wd idea? alright, thanks for reading my crazy idea. vinny

i had this ifea before too, exept using zz's because more space to put drive shaft, diff, etc, but i sent the idea to rs asking them to develope

id like to see how you're gonna do this. If it could be made light enough, it'd be a very good idea.

It's not a crazy idea it's just a difficult one.I have thought about doing some thing like this myself.

I'd just like to see it, I wouldnt buy one untill I try to make one myself and failed at it.

4wd would be nice but why not just start off with 2wd and go from there and if that works do a 4wd one or convert the 2wd to 4wd.

Hi there!

Where would you get such a small diff from? Is it true that the Yokomo "Puchi Mru" have a diff? I never saw a photo of this part but would love to. I would need some kind of smallest diff for my new race-chassis ...

4WD is not that easy - I allready tried. But you need "dogbones" (are they really called like this?) and I couldn't make my own (working ones) this small. But I'll keep on trying - there are several TTTT's where the all-wheel-drive (up to 8 wheels!) allready works.

Greeting from Germany!

janniz, i am pretty sure that those cars do not have diffs. at this size, i think a diff is a waste and has not much effect.
I was thinking about trying 2wd first and then work from there. everything has to be so small its rediculous!

will this be made of a bit chassis or something different?

its a custom chassis that i have already made out of flat plastic. the wheel base i have now i a bit longer than a zip zap. its hard now, and it would be really hard to get everything to in there and have the same wheel base as a zip zap. I need to find very small and stiff plastic rods to make the a-arms. i am going to use a microsizer pro reciever so i have a boost button. i am going to make it easy to change the motor but not the gears(with dual cells and mosfets the stock gears will be good for everything) also i will order the suspension springs from questformaddness and use those, hopefully with adjustable spring mounting points.
the only problem with the microsizers is that the front wheels are smaller than the back. i wanted big front wheels. they will make it easier to mount the a-arms. sorry for the long post guys, but i really want to make this thing. vinny

puchi marus have diffs.. just theyre really crappy.... and dont work well... but the fact that there are diffs at this size is cool...

oops, sorry about that. should have read before i typed.

Cool! please make it!

Thank you! Thats what I wanted to know. I think I'll order one or two "Marus" now (christmas is comming...) and see if I can use the diff. Where can I get those at a good price?

Greetings from Germany!

janniz - the company that made the maru has discontinued them, so it might be difficult for you to find them. i am looking for another maru too.

If you can actually pull this off, I may be interested.

g'day vinny. i like your idea, wondering how it's coming along. if you're interested, my speciality is custom offroad and suspension bits, and i got a site with tutorials that might help you out.

http://geocities.com/bettyk3332003/

Betty, your dirt-Bits are really looking great! Very good tutorials, too! How did you make these dish-type rims?

@strakka:
Yes, I found out myself now that it's kinda hard to find a Maru, even a used one. But at least I could test-drive one some days ago and now a want one for sure! The car was running excellent and the diff was also working good. The owner modified it a bit - he put some other grease into the diff and the car had new rims and soft tires. I loved to drive it!

I think I'll try to make my own ball-diff out of bit-parts now. The gears allready have holes, maybe you can just make those bigger and put little balls into them?? I'm not sure if it will work. I tried to use the diff of the 1/43 Epoch-Racer but it was to big. I'm building another propo-bit with 40-MHz-FM electronics and a carbon-chassis right now and this one should also have a diff, thats why I am (still) looking for the smallest diff available...:rolleyes:

janniz
 

thanks man! i'll be doing a tutorial on the wheels within the week, i'll keep you posted. basically i start with old school lego wheels and drill into the inside of the wheel with a large bit, sort of like countersinking. simple, but effective! i love the idea of the ball diff, pure genius! i'll have a go at it in the future, just looking for the right parts, let us know how you get on.
all my bits are now outdoor toys (except for the cat's!), there's just no turning back!:D

betty.k,

Great site!! The S2000 looks way better modified as a monster truck than it ever did as a sports car. And you've given my partially melted chassis a new life!

Do they really need the shock, or would the T-plate be sufficent? And how can you upgrade to make a fluid filled shock? ;)

Mine is gonna be an extended chassis (Panther clone), dual cell, Mosfets if I can find some, with an 1/8" phono-jack charge port, and maybe dual motors.

I'm trying to decide if this chassis wants to become a Monster Truck, a Stadium Truck, a Rally Car, or an On-Road car. I already have a home made Bit monster truck though, so I'm not sure..

How much does a body installed change the suspension movement? I mean, should you like rework a body to mount more like a Mini-Z?

frizzen
 

thanks man!:D
when i started doing this mod i just used a stiffer "h plate" style design, with the flexibility of the plastic being the spring. so yeah you can get away with no shock. there's pics of my previous work here:

http://community.webshots.com/user/bettykphoto-date

have a look around, there's also pics of how i attach shells in the ultimate f.s. gallery. and you're right, the shell attaches on the front with the tab and on the sides with foam rubber, leaving the rear to move freely similar to a miniz.

gawd, oil damped shock?! sounds nice!! i find that friction provides enough damping on my bits, but hey. if i figure one out i'll let you know:cool:

let us know how you're dirty bit comes along!:blift:

Great link.

Now I'm having routing issues inside the chassis. I'll get it eventually.

The more I play with it, dual motors wouldn't work for the way I'm doing the rear mounting of the back shock. As for Performance mods, if I could find Mosfets, I'd be set. Dual cells are the reason I'm having part of the trouble with routing stuff. I know that I can add capacitance to the board easily, so that should help with acceleration a bit.

Oh well, atleast I can be pretty sure I'll have the most trick Bit Char-G in the state. Now if I could only find a body to fit my monstrosity...

try wraping tin foil around the 2 motors the salder a wire across the to or with zip zap motors just jam it under the cunductor

i've got a micro amps fet modded pcb in my s2000 monster. it's a dual cell, 7.1:1 gears, perfection 3.5 and larger diameter wheels. it flies, can climb up 40 degree inclines and can pop wheelies. so i think fets eliminate the need for a second motor, but to each his own.:blift:

That's probably true, but which is more fun "High Speed" or "Excessive High Speed"?

In reality, probably no Fets. I'm thinking about Dual-motoring the car just to make it that much more exotic.

Then I think I'm going to have a reverse lock-out switch, and an on/off switch (cut down DIP) installed.

aah, you're asking the wrong guy, i'd answer high speed. i'm happy with the 10kph i get out of my offroaders. any faster and they don't steer well and ithey can't do technical sections. my first consideration is torque and 1 set of fets will drive a motor much harder than 2 motors on a stock pcb ever could. a switch is a good idea when running nimh's, i've got switches on my bits. oh, what's a reverse lockout switch? confused: :blift:

Back when these had just more reccently come out, somebody realized that if you rearrange some wires, you can get more power to the motor from the basic setup.

Clip the reverse wire from the PCB, reattach reverse wire to (+ I think) terminal of battery.

A reverse lockout switch is a DTDP (or was it 2T3P) switch connected to the reverse lead and the battery terminal I mentioned. It lets you toggle between "stock board", or "reverse only". I'm not sure how this mod affects speed in relation to the other mods. Never tried them.

Bettyk your site is awesome. You got skills dude. You inspired me to make my own micro truck. I have most of my parts. I am going to use lego wheels like the rug runner mod. I plan to cut the tire and rim in half though because I don't think I would like the look Of them if they are that wide. In your tutorials, the lego tires you say to use are much smaller in height than the ones I am using. How do you get any ground clearance with them? Also, Do you use regular bit springs for the front?

i get about 4 - 5mm of clearance by lowering the rear end and full size wheels up front makes a big difference too. i use those on some of my cars but my monster has hot wheels tunerz wheels onit, they're a good size for a monster, just need to make pen grip tyres for them. i buy custom springs from ph2t for all my bits, they're perfect for the front and rear.

and get a pcb fetted by micro amps, you won't be sorry!

Please build this car!

Oh yeah try to build it off a ZZ SE once you are done. Make sure to get both FET modded by microamps.

sorry guys, i've been caught up in school and also bit planes as well. to make this this nice i wanted to have the same size wheels and tires on the front and back. the only way for me to do that is if i use a zipzap. but the zipzap internals(especially se) are really big. when i made my pan chassis it was hard to fit everything if i am going to use independent suspension. i think that if i found a good source of off road micro tires, i would be motivated to build this truck. I was going to use the micro springs from QFM and make them with adjustable mounting points for racing or bashing. another problem i have had was making 4 a-arms exactly the same with plastic. does anyone have any suggestions?
I also made a monster truck chassis that will use straight axles and 4-link suspension, also the same size as a zipzap. vinnyg.

Betty, those dirt bits are awsome. you caught some huge air in that hummer. did it land from that height or did it just bounce on its lid after it hit the ground?

I'm thinking about taking my MS Sport, doing both suspension mods to it, then getting a dual cell and Stage 2 fet mod. I really want one of those H1 bodies for it, because I've already designed a very small "Whipper Snapper" (little fireworks that you throw on the ground and they pop) launcher with a revolving turret. If I made two then I could stage a micro-rc war in my driveway! Or am I getting a little carried away?