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Flashsp-2
2008.10.02, 06:28 PM
MRCG RB-01

Here she be, in all her wide offset front-end, lexan body, handwound motor, modular electronics goodness...

http://farm4.static.flickr.com/3066/2907280844_e72e9f3115_o.jpg
http://farm4.static.flickr.com/3001/2906434631_26de9a7ee8_o.jpg
http://farm4.static.flickr.com/3243/2907281096_c92e20138b_o.jpg
http://farm4.static.flickr.com/3047/2906434841_9b81ccddea_o.jpg

Additional components used in the build
-ATM knuckles (+1+
-ATM stainless kingpins
-ATM purple front springs
-ATM orange center spring
-ATM black alloy wheelnuts
-ATM delrin damper disks/superhardened damper post
-Kyosho oil shock, 3 spacers, MM length spring
-AVID bearings
-ATM M1 can with 34t spiral/slotted armature
-Sanyo Eneloop cells
-Novak Spy ESC
-Ko Propo 75 mHz FM micro Rx
-Futaba S3154 micro servo
-3R outer tune diff, PN 64p 53t pinion, AVID ceramic 5 ball set-up
-Atlas superwide alloys (Atomicshop.de 15mm foams) rear, Atlas narrow (GQ supersoft 8.5mm foams)...not pictured


Overall, even though I only had a couple of hours to run it, I would say this chassis has lots of promise. It fits my driving style very well, as I love to lay on the throttle very heavy. Instead of the usual over-rotation that I would get from the mr02, I simply get a controlled drift. Once I get it dialed, I think this will rival the AWD for the most-fun-to-drive aspect of mini-z racing. The wide offset makes for a very interesting feel; it's planted yet very nimble. I would say that was probably the oddest thing to get acquainted with, that's for sure. With the lexan body it feels very, very light, almost as light as my mr02 without batteries. Right now I have the Spy in it, but once I get the XMC180 installed, I should have more room in there. As it is, though, there was just enough room to mount all the 'tronics and get the TeamBlueGroove body mounted relatively low.

The suspension, particularly the rear, on this car is amazing. The front end works as well as the mr02, just as it should. The rear end, with it's F1 style plates, is quite another story. The lateral roll is rigid enough to get the car rotating, while the fore-aft movement is soft enough to keep the arse in line even with the excessive power that I am using. The damper system is very smooth, and additional tuning of the center pivot spring is just icing on the cake. I still have lots of tuning to do, and will keep updating whenever I make a new breakthrough. This pup has lots of potential, and I almost feel like I robbed Brian for getting it so cheap

mk2kompressor
2008.10.02, 06:56 PM
another beast:D
these things can take some stick with the throttle especially with that motor!

Felix2010
2008.10.03, 02:07 AM
Love it, Flash. Totally custom, hobby-grade goods - Nice (As all your wips are).:D
Your comments on the rear suspension makes me like the MRCG even more. I tend to run fast motors and go heavy on the throttle. Controlled drifting is just my style.
I hope you have time to add more pics & comments to this thread as you get to drive your MRCG more.

hrdrvr
2008.10.03, 07:19 AM
Did you have your springs in front for the pics? It looks LOW...almost like its sitting on the ground :D

Looking good though. I cant wait to hear more thoughts on it as well.

Flashsp-2
2008.10.03, 07:08 PM
Did you have your springs in front for the pics? It looks LOW...almost like its sitting on the ground :D

Looking good though. I cant wait to hear more thoughts on it as well.

I figured somebody would notice. I had pulled the springs out before I snapped the pics. It sits really low, but not that low :D

Thanks for the compliments guys, I should have more pics/feedback next weekend.

Felix2010
2008.10.06, 12:20 AM
Flash - I have one of those 3R Outer-Tuned diffs also. How you liking yours? I set mine up pretty much the same as you: ceramic 5-ball setup, PN 64p spur-53t, stock steel shaft. Overall I like mine. I hadn't used mine in a lil' bit though until recent, I had slipping problems with the rings so I used a tiny amount of heavy-duty white glue to secure the rings to the inner & outer hub. I only used a small amount of glue on the inner hub too so as to not glue the large black O-ring between the inner ring and hub, only the ring is glued lightly around the center hole. No slipping now. Overall I think this diff is purrty sweet.

Flashsp-2
2008.10.06, 07:40 AM
Flash - I have one of those 3R Outer-Tuned diffs also. How you liking yours? I set mine up pretty much the same as you: ceramic 5-ball setup, PN 64p spur-53t, stock steel shaft. Overall I like mine. I hadn't used mine in a lil' bit though until recent, I had slipping problems with the rings so I used a tiny amount of heavy-duty white glue to secure the rings to the inner & outer hub. I only used a small amount of glue on the inner hub too so as to not glue the large black O-ring between the inner ring and hub, only the ring is glued lightly around the center hole. No slipping now. Overall I think this diff is purrty sweet.

I dig the outer tuned diff, it's pretty solid in my opinion. I haven't experienced any slipping yet, at least nothing that I have noticed. I haven't put many hours on it yet though, so it's hard to say for sure how well it will hold up to this type of abuse. Only time will tell, but for now, it's a nice piece, especially for the price. I will have to try the tricks you mentioned though, thanks...

Flashsp-2
2008.10.07, 03:17 PM
Changed the Spy out for an XMC180, definitely cleared up a lot of room. Also put on the pretty wheels for the photoshoot :D

http://farm4.static.flickr.com/3043/2921738548_2c16009b52_o.jpg
http://farm4.static.flickr.com/3159/2921738224_9a9cbf42fd_o.jpg
http://farm4.static.flickr.com/3171/2921737968_e9f8ae6621_o.jpg
http://farm4.static.flickr.com/3115/2921738096_c403bca6d8_o.jpg

color01
2008.10.07, 03:56 PM
That is a LOT of tire, lol... I also notice you have plenty of servo room even in 94MM wheelbase, what servo is that?

cowboysir
2008.10.07, 04:32 PM
From the angled end near the front I'd say it's a Futaba 3110 or 3114...I have both and they are quite a good space/weight savings.

Flashsp-2
2008.10.08, 03:25 AM
You goobs, read the first post ;)

It's a Futaba S3154; really nice piece, good speed and resolution is great. And it's quite tiny too...

color01
2008.10.09, 05:06 AM
Hahaha noob moment for me! :o Too much text. :p

Any further updates?

Flashsp-2
2008.10.09, 07:19 AM
Any further updates?

Yeah, I mounted up the PN swaybar (green), and changed the springs to ATM purples. The XMC180 definitely doesn't have the same punch as the Spy, it delivers the power in a much softer way. I thought maybe my batteries were low, so I charged them up, but got the same results. I don't really know how I feel about using the XMC...maybe I will stack some meaner FETs on it. As for the chassis, the more I drive it, the more I love it. I can't get over how tiny and nimble it feels, even though it's ridiculous wide all around. With all the weight dead-center, it really rotates, just like we were talking about on GSR. I'll have more updates again, hopefully this weekend, when I get more track time.

cowboysir
2008.10.09, 07:03 PM
Who you calling goob?!:D Seriously though, you also seem to have more servo room because you don't have the autoscale front mount to bump up against.

When you say the 180 has a softer throttle than the Spy do you mean it has a lower ramp/ curve to the throttle but still hits the same top end? Can you program it out on your TX instead of switching fets?

I'll be sticking with the Spy for my build...the Spy and the Spectrum 3500 RX fit together side by side so well I imagine color01 measured the final deck size to correspond perfectly.:D

Flashsp-2
2008.10.09, 07:19 PM
I have an ASC clip on there, but I filed down the back. It's the wierd looking thing with the screws sticking up. It's pretty ugly, but it holds the lexan body just fine, and it doesn't impede my servo mounting.

The XMC just feels softer all around. The punch is lower, and the top end zing is a little less as well. I can't say for sure though, as I tested the Spy on-track and the XMC out in the open, so maybe the difference really isn't that pronounced. For me it just feels like the power has been reigned in a bit, and I'm not sure how I feel about that.

If I had spektrum I would soooo be using the Spy, but with the Ko Rx the space is a little too tight. Either way, using real electronics is so much better. This car is what a mr02 wishes it could be :D

Felix2010
2008.10.10, 12:35 AM
Flash, thanks for the updates on the XMC180 compared to the SPY. Sounds to me like the SPY is where it's at with the MRCG due to the extreme rear grip you're getting with that chassis. For modified Pan, tons of rear grip + tons of power is what I would like.:)
I like the SPY's specs too - The only minus is the size. Do you think de-casing the SPY is a must? Just wondering, I would think the case needs breaking for removal but I don't know. I just don't see any screws.

Flashsp-2
2008.10.10, 04:04 AM
The size of the Spy isn't too bad if you are using a 2.4 receiver, but with the 75mHz receiver you will run into space constraints (unless you use a GWS micro). I have yet to track test it, so maybe the XMC wasn't all that bad. The case for the Spy doesn't need to be broken, it's held together with some notched tabs. I still have the case to mine somewhere around here :D

Felix2010
2008.10.10, 04:27 AM
Very cool. Thanks again for the info good buddy. I may have to check out the SPY then, since those TGR second-generation Spinners are so hard to come by. That is, once I can get me a slick new chassis to put it on. :)

Flashsp-2
2008.10.13, 08:47 PM
Got a good bit of testing in this past weekend. I have to say that my initial thoughts on the XMC180 were a bit harsh. On a closed track this ESC still provides lots of power, and takes the edge off only slightly. I also decided to make a few slight changes. I went with a PN green swaybar in the front, changed out the ATM 1* knuckles for 3R 2* knuckles, and changed from the stock oil damper spring with 2mm preload to a yellow spring with 3mm preload. . The car is pretty much dead neutral now, no power sliding, no push, just lots of steering, lots of rotation, and tons of grip on both ends. It's also nice to have reverse again, as the Spy I have has a defective reverse funtion (it's worked all of three or four times). Having reverse allowed me to push the car even harder without worrying about walking over and turning it around every time I hooked a wall. The only issue I am experiencing is the servo horn occasionally popping out of the tierod linkage. This is obviously an issue only because of the lexan body; I don't forsee this being a problem at all when using an ASC or pan-type body. Even still, it only happened once or twice, and given the amount of time this thing spent dancing with the wall and corner apexes I think it still held up well. I've yet to break anything (knock on wood), and every time I drive this thing I just can't seem to get the sh*t-eating grin off my face for hours...