I’ve run a few more packs through the buggy with the sealed diffs, and they seem to be working pretty well. I have updated the guide.

I’ll mail a few O-rings and the paper gasket pattern to the first couple of people who ask. Just PM me your US address, and be sure to post back how well it works for you!

I used synthetic car grease in front diff, and regular car grease in rear diff. The synthetic grease is like honey, making front diff tighter. The regular grease is like butter, making rear diff looser then front. I'll send you a PM and try the o-ring setup.

It can be hard to figure out the harder springs from the soft ones from the way they are labeled, so I made this chart.

Long black 2.92 lbs
Short black 2.58 lbs
Orange 2.45 lbs
Blue 2.25 lbs
Silver 2.10 lbs
Yellow 1.85 lbs
Red 1.50 lbs

This is the amount of weight it took to fully compress the spring. Not sure that's how springs are rated, but that's how I got these numbers.

Neutral range determines how sensitive the trigger is. The lower the number the quicker car responds to the initial movement of the trigger.

What sensored motor from hobbyking can I use?

https://hobbyking.com/en_us/1-14th-s...or-4620kv.html
https://hobbyking.com/en_us/turnigy-...or-5330kv.html
https://hobbyking.com/en_us/turnigy-...ll-lipoly.html

These look like either clones or private-label production of the Carisma V70TypeR ESC and sensored brushless motors.

Carisma Racing V70TypeR, 70A Sensored Brushless Speed Control, w/ Turbo | Products - Carisma Radio Control Model
Carisma Racing 4600KV Sensored Brushless Motor | Products - Carisma Radio Control Model
Carisma Racing 5350KV Sensored Brushless Motor | Products - Carisma Radio Control Model

This is awesome!

Springs are rated in weight per distance compressed.

Can you measure the relaxed and compressed length of the springs, so we can get pounds per inch? I'll post it up in the top part of the thread.

Long black
1 21/32
5/16

Short black
1 17/32
5/16

Orange
1 5/8
5/16

Blue
1 11/16
3/8

Silver
1 21/32
5/16

Yellow
1 11/16
3/8

Red
1 11/16
7/16

Thanks for finding that. I hate looking for things on hobbyking. There search engine sucks.
Would like to get the turnigy-trackstar 5330kv motor, but don't see any dimensions. Not sure it will fit. Would you know how to get the size of this motor?

EbbTide bought one and measured it in another thread:

proliteandsc, I've used your length and weight data to make a table of all the Dromida springs, how to identify them, and what their spring rate is.

That motor is big. Has anyone installed it into a dromida? If so. Do I need to modify anything?

Thanks. Just got my program card in yesterday!

Great thread. Thanks to the OP for an awesome job compiling the info. I have a brushed Rally and now I'm looking forward to doing something with it.

I got Carisma’s version because I assume it’s higher quality than the HobbyKing one. I ordered it from Carisma’s Amazon.com listing.

On a first test run, it pulls real well on 2S with a 12T pinion. Looking forward to gearing it up :-)

It fits fine if you put the ESC on the chassis brace. It has 2.5mm mounting holes that fit in the stock motor mount with the stock screws. It also has 2mm holes that fit in the alternate location of the stock mount. It requires 1/8” (3.125mm) pinion gears, which are available from Robinson Racing. Or you can carefully drill out a Dromida 2mm pinion.

I plan to eventually upgrade to a Mamba Micro X ESC to use the hybrid sensored/sensorless mode, but it is running great sensorless right now.

Here’s how it fits: