Digital.Complex: [project] Fancar v3.0 (Mugen MST-1) - Digital.Complex

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[project] Fancar v3.0 (Mugen MST-1)

#1 User is offline   aotsukisho 

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Posted 21 November 2011 - 11:44 AM

RC Heaven had a box of Mugen MST-1 parts for $30, so I picked it up not knowing what was in store for a future project.

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most of the important stuff is in here already

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rebuilding the rear end

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new rear uprights attached

I didn't have that much time to work on it this weekend, hopefully I'll get more done as time goes on. The major parts I need immediately to get it running include shocks (Mugen ones too expensive, thinking of making do with Traxxas ones), a rear shock tower, and the diff outdrives. We'll see what direction this truck takes.
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#2 User is offline   aotsukisho 

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Posted 23 November 2011 - 04:11 PM

I did some more exploration with the MST-1 last night, and found exactly what parts I need to get this thing up and running again.

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most of my time was spent examining the transmission, supposedly it's one out of an XXX-NT.

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it looks fairly damaged, I assume that it's in this condition (with a missing rear shock tower) because it was in a huge crash.

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The entire inside of the transmission case is covered in what I assume to be bronze dust, from the popular bronze idler gear upgrade.

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removing the input shaft and idler, need to remove the E-clip and brake disc first

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if you look closely at the teeth on the idler, it is unusable

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transmission case is cracked. Not sure if it's worth using anymore.

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I have all these pieces to build a diff out of, all I need are the tension bolt and the outdrives. With the state the transmission is in I am seriously tempted to just buy a modern one. There's RC10T4 metal gear transmissions for $35 on eBay.
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#3 User is offline   aotsukisho 

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Posted 07 December 2011 - 03:59 PM

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installing the Rustler shocks. I won an auction for a Losi XXX-T CR transmission, complete with motor mount. This will make my job of converting it a little easier I hope, but it may mess with the weight distribution a bit.

I still need tires for this thing, but other than that it's almost good to go. I'm really looking forward to getting a running 1:10 stadium truck for under $100.
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#4 User is offline   aotsukisho 

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Posted 22 December 2011 - 04:29 PM

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inspecting the XXX-T transmission

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the Mugen dogbones don't fit. The XXX-T CR uses some amazingly tiny dogbone pins.

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XXX-T universals

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some short course rims/tires I picked up for $25 on eBay

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mounting the fronts just fine

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pulling out the Losi foam

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now the ballstuds come out

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thankfully the XXX-T and the MST-1 use the same diameter hinge pin

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removing the slipper clutch to open the transmission

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aluminum input gear and plastic idler and diff... hmm. the rotating mass all comes from the diff outdrives

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hidden screw to take off the motor plate

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using TC5R spare parts for a new arm mount

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if we stretch it a little, we don't have to drill new holes

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transmission mounting holes

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getting the trans on there

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unfortunately my transmission was sold to me with a broken case, so there's only one screw holding it on right now

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view from the front

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the Losi universals are huge, and they hit the arms...

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slowly coming together!
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#5 User is offline   aotsukisho 

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Posted 06 February 2012 - 10:34 AM

The MST is slowly but surely getting closer to completion...but probably not in the way I intended when I started this project. Unfortunately, the Losi transmission is going to be difficult to mount in such a way that it yields good performance I figured I'd just remove the entire problem and make this chassis a place for Fancar v3 to start.

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I removed the pin from the CVA, so that the axle is just there to bolt the wheels to.

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I didn't buy a replacement Mugen shock tower since it was a million dollars, and the Losi one was hard to find and I'm fairly sure it bolted to some plastic on the chassis which I obviously don't have. I decided to use the empty transmission case as a platform for my cheapie Team Associated shock tower.

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If I make a plate for it and bolt it here, then the Rustler shocks will match up nicely.

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speaking of the Rustler shocks, they came with a different ball end that is too long for the hole in the MST arms.

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popped in one from the various Revo arms that I busted, and now it's much better.
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#6 User is offline   aotsukisho 

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Posted 10 February 2012 - 05:25 PM

Got started with the conversion.

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This is the last photo taken of Fancar v2.1 before being dismantled

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taking off the entire upper deck in order to take off the EDF brackets

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I figured I could kill two birds with one stone: what to do with the old Odyssey body, and where to find a body for the new project.

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due to the way I built the bracket, body posts are included and already spaced properly

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I might have to find a way to drop the fan lower and make the body posts (and body) higher, due to the way it conflicts with the huge suspension travel in the truck.
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#7 User is offline   aotsukisho 

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Posted 09 April 2012 - 10:08 AM

Did more work on the conversion, but a lot of my time went into figuring out how I should mount the fan to the chassis.

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drilled through the rear hinge pin mount. the bit through the plastic is 7/64", perfectly piloted for M3 screws

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tried using this as a mount for the suspension pillow ball.

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mounted on the chassis

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another look at the mounting

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it ended up being too close together, so I did a system using Traxxas ball ends (unused Revo second servo pushrod ends) on the Mugen turnbuckles.

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full compression. There seems to be a lot of change in camber, but hopefully this is balanced out by the body roll.

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current flaw in the system: plexi is too long and contacts the ends.

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I need to get creative with the EDF mounting system...

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drilling holes to mount the thing.

That's all I got to do this weekend, hopefully I'll have enough free time to continue with the project. I plan on using the vertical rails to mount the fan assembly on.
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#8 User is offline   aotsukisho 

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Posted 15 May 2013 - 04:22 PM

Did some updates to the project over the weekend.

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I lost the original plans for the EDF mount that I had talked about in the last post, so I did what I could using parts off the EDF-Revo project

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it came together quite nicely

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rear suspension took quite a bit of work to figure out. I replaced the plexiglas and was able to use the AE shock tower since the EDF would be mounted high

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some refinements to the suspension geometry

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rear view of the interesting turnbuckle setup

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EDF mounted, with a wing attached. I learned that it's not only for show, but helps keep the chassis level when on power.

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front view

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now with the body on

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ESC mounted. I'm not sure if I'm gonna go with a land or air ESC for this one yet, since I don't know if I have any more air Rx left.

Hopefully by next weekend I can get the project finished!
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#9 User is offline   aotsukisho 

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Posted 24 May 2013 - 05:12 PM

Finished up the first version of this Fancar.

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mocking up the servo location based off of the original setup

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drilled through the chassis to screw in servo mounts

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using one of the older Tower Hobbies digital servos

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battery tray

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super ghetto but whatever, it works

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mounted the MMP to the crossmember like I usually do

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ziptied and taped, I don't want it going through the fan if it breaks loose lol

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testing with some Traxxas NiMHs for weight distro

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routing the ESC/motor wires through the shock tower

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straight off of the ESC

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lifted van body. Mockup, since I have yet to do the front body post...

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piece of aluminum sheet metal

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blurry photo of the final product

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Oh yes.

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and it lights up as well

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look from the top

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looking from a little lower down

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I've missed this sound so much

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another view of the LEDs

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if I'm honest, the alignment is a little off, particularly in the rear where there's excessive toe-in. I'll try to straighten it out a bit since it doesn't need it much but for now I'm just gonna make sure it works properly

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in-body shot looking at the rear

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with the EDF running

I might have to get another motor if I want to run this on 4s/6s, since the T600 I currently have really doesn't push enough air unless you run 8s. On 4s it's having a really hard time getting going, I'm gonna see what I can do to up the power or something. A bit difficult when it's the only hardware I have that uses 6mm motor shafts.
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