Big Rock Kaladeth’s Big Rock 3S

[kaladeth]

Hi all. Will update as I go!

List of mods:

11/25/2023
- Arrma Big Rock V3 3S BLX RTR

11/27/2023
- (removed) HobbyPark aluminum steering blocks and rear hubs

1/17/2024
- Pro-Line Badlands MX28 BELTED wheels with 17 mm adapters
- Promodeler DS635BLHV Servo

1/24/2024
- Hot Racing Aluminum Differential Yoke
- Arrma Outcast 4S Input Gears (metal)
- Arrma Outcast 4S Differentials (metal)

1/25/2024
- (removed) Hot Racing ATF257EX Steel 57T Duel HD Slipper

3/1/2024
- Pro-Line Performance Shocks

3/14/2024
- (removed) Arrma Kraton 4S V1 center brace bar
- (removed) M2C 17mm Hex Adapters

3/21/2024
- Castle MMX8S ESC
- Castle 1717 1650kV Motor
- (removed) SaGa 21t Mod 0.8 pinion gear
- Custom ESC mount

3/25/2024
- M2C Motor Mount and Chassis Brace

4/10/2024
- SaGa 25t Mod 0.8 pinion gear
- SaGa 57t Mod 0.8 spur gear
- Aluminum Slipper Eliminator
- Hot Racing ATF125HL01 Aluminum Reinforced Slider Driveshaft LWB Chassis
- SMC HCL-HP 4S Battery x2
- PMT Q1 Super Soft Tires (rear)
- PMT Q3 Soft Tires (front)

6/9/2024
- Mojave 4S arms, driveshafts, hubs, turnbuckles, and 17mm hexes

Someday Maybe
- Custom quick release body mounts
- Custom lights
- Team Associated steel turnbuckle balls

 

[King blitz]

ok

 

[kaladeth]

Lights power check. Looks good.

 

[King blitz]

View attachment 336895

Lights power check. Looks good.

Can't wait to see them installed on the body cover,

 

[kaladeth]

Headlights done. Yay! Cutting holes in the polycarbonate body was a challenge. I used a mix of knife, dremel, clippers, and a bunch of swearing . Any tips for me before I cut the 4 other holes?

I also had to get the little light controller board so I can use the remote to switch the lights on and off. Will be using splitters too.

I am also slowly realizing these lights won’t survive a proper bashing session (I am sure you all were aware of that already haha)… so will most likely buy a second body soon for the fun outings. Anybody selling a spare/old one, hit me up!

More to come.

 

[kaladeth]

Tail lights done!

 

[kaladeth]

Fog lights done! Will hot glue and CA the wires and run with this for a while - see what breaks.

Next up will be front and rear light bars and the roof rack that will hold my go pro!

 

[kaladeth]

The headlights fog lights and taillights are all now completely wrecked, so they have been uninstalled.

I got the roof rack and light bars on, hopefully these are a little bit more “bash friendly”.

 

[kaladeth]

Arrma 4S metal diffs, Hot Racing aluminum yokes, Hot Racing metal spur. Shimmed the diffs.

 

[kaladeth]

Replaced the stock Spektrum servo with a ProModeler DS635DLHV servo and 17F-15T servo arm.

Start.

Unscrew ESC and switch.

Remove 4 screws on the bottom to remove the receiver box. Remove the 1 screw to release the servo link.

Take the truck away and focus on the receiver box.

Remove 4 screws to remove the stock servo. Save the servo link and the screw that secures the servo saver to the stock servo.

The ProModeler arm is 2mm taller than the stock servo saver…

So, used a set of 4 Reefs RC servo washers as spacers to offset / lift the servo. This provides enough clearance between the bottom part of the arm and the bottom of the chassis.

The ProModeler servo arm is also 2mm wider for the stock servo link, so I used 4 0.45 mm thick M3 washers.

Reassemble.

Done!

 

[King blitz]

Replaced the stock Spektrum servo with a ProModeler DS635DLHV servo and 17F-15T servo arm.

Start.

View attachment 351086

Unscrew ESC and switch.

View attachment 351087View attachment 351088

Remove 4 screws on the bottom to remove the receiver box. Remove the 1 screw to release the servo link.

View attachment 351089

Take the truck away and focus on the receiver box.

View attachment 351090

Remove 4 screws to remove the stock servo. Save the servo link and the screw that secures the servo saver to the stock servo.

View attachment 351091

The ProModeler arm is 2mm taller than the stock servo saver…

View attachment 351092View attachment 351093

So, used a set of 4 Reefs RC servo washers as spacers to offset / lift the servo. This provides enough clearance between the bottom part of the arm and the bottom of the chassis.

View attachment 351098
View attachment 351094

The ProModeler servo arm is also 2mm wider for the stock servo link, so I used 4 0.45 mm thick M3 washers.

View attachment 351095

Reassemble.

View attachment 351096View attachment 351097

Done!

Well done sir. Now go rip up some dirt will ya

 

[kaladeth]

Ran two packs through and all the time was thinking… I’m going to need more speed… . Any suggestions on an ESC-Motor combo? I know an XLX2 and 2028 won’t fit - already checked .

In the meantime the shock oil arrived so I was finally able to install the Pro-Line shocks! I had to use the included longer shock ends to clear the lower A arms.

 

[J.Rambo]

Sweet Ride bro! I was thinking about running lights on mine too. Might have to hit you up to get a better idea of how you set that up.

Currently running HW max10 w/ hobby star 3674 on 3s/4s. Runs a little warm, was thinking about running max 8 and a 4074.

FYI, MMX8s and a 1717 1650kv will fit if you cut out the reciever box if you decide on going w/ castle.

 

[kaladeth]

@J.Rambo thank you! Yes please do - happy to help. Lights are a must have for night bashing. I am thinking of 3d printing some light buckets and using hot glue as a lens.

And yes that’s my prime combo candidate. Trying to see what’s needed to accommodate the longer shaft.

SPMXSM2000 - Spektrum FIRMA 3200KV
Shaft Length: 18.5mm / 0.73"

CASTLE 1717 SENSORED MOTOR - 1650KV
Shaft Length: 20mm

 

[J.Rambo]

@J.Rambo thank you! Yes please do - happy to help. Lights are a must have for night bashing. I am thinking of 3d printing some light buckets and using hot glue as a lens.

And yes that’s my prime combo candidate. Trying to see what’s needed to accommodate the longer shaft.

SPMXSM2000 - Spektrum FIRMA 3200KV
Shaft Length: 18.5mm / 0.73"

CASTLE 1717 SENSORED MOTOR - 1650KV
Shaft Length: 20mm

I've got that castle setup in my vendetta (same size as big rock 3s). I don't recall having any issues as far as shaft Length. Just had to chop off the reciever box to get the mmx8s to fit right there.

 

[kaladeth]

Arrma Kraton 4S V1 center brace bar installed. I think I need different mount post hardware to secure the ends.

These M2C 17mm hex adapters are nice!

M2C chassis brace installed:

 

[Dan B.]

Replaced the stock Spektrum servo with a ProModeler DS635DLHV servo and 17F-15T servo arm.

Start.

View attachment 351086

Unscrew ESC and switch.

View attachment 351087View attachment 351088

Remove 4 screws on the bottom to remove the receiver box. Remove the 1 screw to release the servo link.

View attachment 351089

Take the truck away and focus on the receiver box.

View attachment 351090

Remove 4 screws to remove the stock servo. Save the servo link and the screw that secures the servo saver to the stock servo.

View attachment 351091

The ProModeler arm is 2mm taller than the stock servo saver…

View attachment 351092View attachment 351093

So, used a set of 4 Reefs RC servo washers as spacers to offset / lift the servo. This provides enough clearance between the bottom part of the arm and the bottom of the chassis.

View attachment 351098
View attachment 351094

The ProModeler servo arm is also 2mm wider for the stock servo link, so I used 4 0.45 mm thick M3 washers.

View attachment 351095

Reassemble.

View attachment 351096View attachment 351097

Done!

I somehow missed this thread, nice build! That servo is one of the best out there. It does pull some serious amps, though. I’ve never been able to run a 635 on a stock ESC’s BEC without brownouts. HobbyWing or Castle ESC’s handle them fine when plugged directly into the receiver.

 

[kaladeth]

New motor and ESC installed. Ready for some jumps!

Custom motor mount in the works to enable some interesting options for speed runs.

 

[Luke66]

Dang bro....

 

[kaladeth]

Bling. Unfortunately even though M2C claims this mount “has increased length slider slots for larger motors and gears” it has exactly the same dimensions and slider slots as the stock Arrma BLX Motor Mount.