Build Thread Kaladeth’s MCD XS5 MAX Ultimate

[kaladeth]

It’s official - I’m crazy.

I’m going to need a lot of help on this build.

> MCD XS5 MAX Ultimate

I think I’m going to need more space .

Stuck in the steering servo. It’s huge!

> AGFRC 78kg Servo
> AGFRC Servo Arm

Check out the shocks.

Will be racing this in the fifth scale electric class so need to convert.

- Take out gas tank
- Take out exhaust

I’m planning to run this with 8S on a MAX 5 G2 and a 56118 1100kV motor.

> HobbyWing MAX 5 G2
> HobbyWing 56118 1100kV
> 2x SMC HCL-HVC 15.2V-10200mah 120C with QS8

Because of this, I think I will have to gear down from stock. Target max speed = 60 mph on the straight.

The battery tray needs to be trimmed to allow for the longer batteries.

Apparently I also need a separate brake servo to keep the motor cooler under braking. Not sure yet where to mount it, how to link it up, and how to set it up on the radio.

> Savox SB2290SG Servo

Will need to find the biggest RX battery that will fit. This is going to need some hefty electrical wiring design.

> Protek RC 2S 130C 7.6V LiHV 7200 mAh

Will be installing the standard cooling fans from RCP.

More to come!

 

[9x19]

Wow!

 

[Tunedfrog]

Awesome kit.

 

[Lukedavis]

Now this is gonna be crazy!

 

[ferrebee88]

That is a nice rig! I would love to have the short course version!

If you need additional help, here is a very helpful link. On Largescalerc.com there is a whole sub-forum for MCD
https://www.largescaleforums.com/forums/mcd-racing.10/

 

[luke66]

Giant RCs are tops!

 

[Doom!]

Beast in the making!

 

[kaladeth]

Hopefully can progress this build a little bit!

 

[TeknoJ]

Those are really nice cars, it’s a shame to see it converted to electric but, it’s still going to be a rad car!

 

[kaladeth]

Fuel tank out. Just remove three screws on the bottom:

Exhaust pipe out:

These two exhaust pipe stands also taken out:

Not sure what this is for, but it’s also in the way, so I took it out:

Installing the motor was tricky. The documentation is sparse!

Sequence:

• Take out 3 retaining screws on motor mount plate
• Loosen screw on top of motor mount plate

• Take out motor mount plate

• Remove clutch bell by removing the retaining nut and pinion. Keep that (big) washer/shim!

• Attach pinion shaft adapter (9101) to the motor drive shaft. Loctite the two set screws.
• Slip on rear mount (9103). Inner ring Groove faces forward. Outer ring Print faces backward.
• Attach front mount (9102). Notch should be pointing up. Loctite 4 screws onto motor front plate.
• Screw rear mount to motor mount plate. Loctite four screws. Cinch top screw on rear mount.
• Reinstall washer and pinion + washer + nut.

Reinstalled motor mount plate + motor assembly in the car:

The hardest part is done. Next up, soldering, wiring, and cable management (I am very poor at this!).

 

[kaladeth]

Always good to do a layout check to see if wire lengths are okay.

The usual Y series cable. I desolder the pigtails and solder the ESC leads direct.

Offline systems check before mounting all the stuff on the car. All good!

Had to learn how to use the Hobbywing Multifunction Program Box. Ended up connecting it to a PC. Firmware on both ESC and PB updated to latest versions. ESC BEC voltage set to 8.4V. All other settings kept at Default for now.

 

[kaladeth]

Folks usually just use double-sided tape to secure the ESC to the chassis or radio box etc. That would usually be enough - have seen crashes and tumbles with my Arrmas in the past and the 3M tape would hold up.

In this case I had a little fun modifying the stock radio battery cover, by integrating a MAX5 G2 mount:

Printed out OK. This is in PLA:

Comparison of the stock cover (lower piece) vs. the new:

A little bit of filing was needed here and there, but overall the fit was good on the fist try!

ESC finally mounted:

 

[kaladeth]

Managed to do ~20 second lap times on the first go. Not too bad!

40 14:29

Fast: 19.598 Avg: 21.731

Apparently the tires need to be run about 4 times for them to get going, so I expect quicker times in the near future.

Had to screw rescrew and finally loctite the screws that hold on to the steering stubs.

Also set droop to zero (both front and back) so that the arms are level. I think they come with a lot of droop from the factory for rally use.

The 10200 mah batteries felt hot and abused at 14 minutes of runtime. I will probably limit it to 10 minute runs from now on.

 

[TeknoJ]

Thats where I would think that testing different batteries is going to tell us what is good and what isn't. Just because it's an SMC doesn't mean it's the best.

 

[kaladeth]

Fastest lap: 18.761

 

[kaladeth]

 

[Doom!]

Sweeeet!

 

[CertifiedMike]

View attachment 257376

The paint job looks great!!! Beautiful car!

 

[kaladeth]

Thanks Mike! It took a poop ton of Tamiya paint

 

[CertifiedMike]

Thanks Mike! It took a poop ton of Tamiya paint

Lol! Its not cheap but it gets GREAT results, clearly! Its my fav paint brand so far.
It looks cool with the sun shining on it and the white wheels make it pop!

The shape of the body alone makes it look like its doing 50mph in that pic!
Its pretty awesome, the whole car I mean!