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Getting a Micro RS4

Old 02-12-2009, 07:13 PM
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maxxdout
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Default Getting a Micro RS4

Hey what's good?

I will be buying an HPI Micro RS4 roller off a guy on here for $30 and I plan on going brushless. This is going to be a "budget" brushless build for just messing around on the indoor track(and possibly racing, we'll see ) and as I don't have much money to work with, I will not be spending a lot ($200 at the most). The RC18R and XRAY M18 may be better cars, but the price just isn't for me

The kit will be coming with a body and a servo with some tape holding the wires together but it won't take long to put some shrink-wrap on It also needs rear body posts which shouldn't cost much. Other than that, the MRS4 is in ok shape but there's nothing that a few $$ can't fix Comes with a Vette body too [8D]Here are some pics of the kit:







Here's the setup I plan on running...

Hitec RX: http://thetoyz.com/cart/thetoyz_deta...cat_name=RC18T


EZRun BL ESC: http://www.hobbycity.com/hobbycity/s...idProduct=7189


Turnigy 3500kV BL Motor: http://www.hobbycity.com/hobbycity/s...idProduct=4194


1450mAh LiPo: http://www.hobbycity.com/hobbycity/s...idProduct=6305


10 tooth pinion(might get a few different ones): http://www3.towerhobbies.com/cgi-bin...?&I=LXBGE6&P=7

I have also heard that I might want to upgrade to universal driveshafts and ball-diff in the front and an aluminum diff frame so that it can handle brushless. Is this true? If I take it easy, will this car handle brushless stock?


Thanks and have a good one,


maxx
Old 02-12-2009, 07:32 PM
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BigTb17
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Default RE: Getting a Micro RS4

I had one that was basically stock and I didn't drive it much because I didn't have many places that were smooth enough to be fun and my other R/Cs usually won out whenever I was looking to drive something. Never had any problems with it.

My buddy had one (with the Vette body too) and he put a brushless system in it right away and drives it with a 1250 2s Li-Po. He never had any drivetrain issues (and he's not very easy on things). His issue was getting enough traction to do anything other than donuts and drifting. It spins the tires so easily that I don't think drivetrain stress should be a huge issue unless you are super hard on it. But I am only basing that on his experience, as they say "your mileage may vary". He has a fairly mild brushless system in it, but the one you list looks pretty mild too. The tires it comes with like to fly off when you put any kind of power in it though. You might want to invest in better tires/rims than what comes stock.

Parts haven't been easy to find locally, so be prepared to have to order parts when you need them. Unless you are lucky enough to find a local shop that stocks some stuff.
Old 02-12-2009, 07:39 PM
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Default RE: Getting a Micro RS4

Thanks for the reply BigTB I won't be too hard so I guess time will tell how long it will last

I buy parts online all the time and the nearest LHS is about an hour away so getting parts might be harder than usual, but I don't mind buying them off the internet if I can find them

If those tires fall off...CA GLUE TO THE RESCUE!

Thanks again for your help TB, I appreciate it [8D]

Cody
Old 02-12-2009, 07:46 PM
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Default RE: Getting a Micro RS4

the can size is a issue with the stock rear pod and motor plate. it looks like the motor has already been swapped, so you might be cool. might want to measure before you order that motor... i think i have the GH front one-way diff and the hpi rear ball diff. i destroyed the entire drivetrain in mine as soon as i started upgrading. so i guess "results may vary"

i JUST ordered a new rear axle for mine! i also got a replacement carbon upper deck to stiffen 'er up a bit. i never ran one before. last time i ran it, i was slinging wheels off the carriers with my high torque pp motor! i shaved a old heli brushless motor and squeezed it in there, but the esc i had planned for it was toast. im excited about running it again as the last time it ran my jaw dropped! shortly thereafter i sheared off the drive side axle threads []
Old 02-12-2009, 07:54 PM
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Default RE: Getting a Micro RS4

Thanks for the tips, Sonic. I plan to buy the car first, then save up for the rest of the electronics so I will measure er' up and see how it goes Just wondering, were you saying the diameter of the motor might not fit in there or the length?

Thanks, Cody
Old 02-12-2009, 08:01 PM
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Default RE: Getting a Micro RS4

diameter has always been my problem. a long can brushless might cause a issue too i recon....

the front one-way and a properly dialed rear ball diff will cure that traction issue bigtb spoke of.
Old 02-12-2009, 08:07 PM
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Default RE: Getting a Micro RS4

heres some pics of mine as she sat back in '02





Old 02-12-2009, 08:13 PM
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Default RE: Getting a Micro RS4

Lookin' good! Can't wait to get mine!
Old 02-12-2009, 08:40 PM
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Default RE: Getting a Micro RS4

looked good. those pics were like 7 years ago! a little different now...
Old 02-12-2009, 08:45 PM
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deanR
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Default RE: Getting a Micro RS4

I would get a faster motor... You could go a lot higher than 3500 kv in a touring car. it might be a little slow.
Old 02-12-2009, 08:54 PM
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Default RE: Getting a Micro RS4

I'm not looking for it to set a land speed record. A 3500kV motor should make it cruise around the track pretty good without overdoing it
Old 02-18-2009, 04:44 PM
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Default RE: Getting a Micro RS4

Hey,

Guess what? I'm not getting that MRS4. I am getting a better one! Here are some specs on it...

-CF Chassis
-Aluminum Front-End
-Two bodies(Stang and Skyline)
-One way front diff
-Rear Ball diff
-Foam tires
-LiPo
-Needs radio

Guess how much? $70! I think it's a sweet deal. What do you guys think?

Old 02-18-2009, 08:42 PM
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Default RE: Getting a Micro RS4

carbon, novak, lipo & masking tape! awesome!
Old 02-19-2009, 04:36 PM
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Default RE: Getting a Micro RS4

Haha hell yea! Can't wait to get this little bugger....
Old 02-19-2009, 04:39 PM
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Default RE: Getting a Micro RS4

Just realized.... How do the wheels mount on to the car? Don't see any nuts anywhere[X(]
Old 02-19-2009, 06:00 PM
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Default RE: Getting a Micro RS4

wheels slide onto a hub so its possible to cover up the nut.
Old 02-19-2009, 07:02 PM
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Default RE: Getting a Micro RS4

Oh, I see what you mean
Old 02-20-2009, 12:11 AM
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Default RE: Getting a Micro RS4

unless the wheel fits the carrier super snug, they tend to launch off fairly easily. i put a small drop of ca on each wheel to keep em in place.

i finally ran mine last night... its waaaay touchy! way more than i remember! gearing for sure is way off. could be because the front one-way is actin' the fool. left side engages most of the time, freewheels fine. the drive side just freewheels. i broke it down as far as i could figure out to, cleaned & relubed. i don't know if i used the wrong lube, too much lube or if the one way is just shot. i don't know how to get the one-way bearing out and i can't remember who makes it []

i gotta find some thinner rod ends as my home brew dual link setup doesn't clear the belt anymore. hmm... i think i may have lowered the chassis a little more in the past. thats probably it.

anywho... i bet this thing is fun on carpet or some other super smooooove surfaces!
Old 02-20-2009, 06:53 PM
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Default RE: Getting a Micro RS4

Yea man! I hope my diffs aren't worn out. The guy shipped it yesterday so it might be here tomorrow or monday as it is coming from 3 states away.

So the wheels just push on the hub? That's a weird design LOL. Wondering if I can just glue them to the hubs then get spare hubs for other wheels...
Old 02-20-2009, 07:01 PM
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Default RE: Getting a Micro RS4

if you glue them on securely, you can't get the wheel off as the wheel covers the axle nuts. you could cut out or drill out the center of the wheel to remove em, but thats kinda ghetto. a drop of ca is sufficient to hold them in place until you are ready to remove them.

im hoping the front diff issue is just some crud lodged in the one-way bearing. i'll soak em in some solvent overnight and cross my fingers! thats $30 i don't really want to spend!
Old 02-20-2009, 07:02 PM
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Default RE: Getting a Micro RS4

Haha alright, thanks for the help
Old 02-21-2009, 11:05 AM
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Default RE: Getting a Micro RS4

The MRS4 and my MiniT have been my most favorate mini's ever.

But in stock form the MSR4 will suck just like the stock MiniT. Once you put some hop-ups on them they became my favorates.
I run a 540 size 19T brushed motor in my MRS4.
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Old 02-21-2009, 03:02 PM
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Default RE: Getting a Micro RS4

upper bulkhead, hub carriers and body posts... thats all the stock plastic i can spot! i always wanted the 540 kit but never pulled the trigger. thats a lot of stuff in one itty bitty place! what esc is that?
Old 02-21-2009, 07:55 PM
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Default RE: Getting a Micro RS4

It's a MTroniks forward only racing ESC. I have 3 of the 540 conversions. The 2 of the original that I posted pics of and then one of the new ones. On the original I have blue and grey. The new I have black carbon fiber running 2S lipo.

The one pictured is running 8 cell 1100mah batteries.
Old 02-21-2009, 09:01 PM
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Default RE: Getting a Micro RS4

Nice ride Keith I bet that thing cruises

The MRS4 didn't come today so it should be here Monday. God I can't wait!

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