Update
I changed quite a bit on the board. Also I now have BLE telemetry and data logging via a custom app - this will give me some interesting insights.
Sealing the motor
I sealed up the motor with a two part 3D printed cap and several small insets that perfectly fit into the gaps on the motor base. The insets are epoxied, the cap is screwed and further sealed with Sugru.
Heel straps
I now have Trampa heel straps. When I ordered the board I could have gotten these for a discounted price, but I thought “why the hell would I need that?!”. I learned it during my very first ride 
Impressions
They are a great add on. It just gives a comfortable feeling of safety, especially when it is wet on the board. And I can lean into turns better.
ESC enclosure
I re-did the ESC enclosure. Before it was a 3D printed provisionary solution. It was a one part enclosure, sealed up with Sugru, so I couldn’t open it for maintenance etc.
I now use a Serpac ABS IP67 two part enclosure that I can open if I need to. The heatsink on the top stayed the same.
Trampa Barrels
Before the barrel/elastomere upgrade I was on springs with yellow dampas. While that was fine for carving, it felt very unstable at 30+km/h or on sudden throttle releases.
Impressions
Riding with the barrels is a night and day difference in terms of stability. It is astonishing how super stable and safe they feel, no matter how fast I go or how fast a accelerate or brake. Before I was super afraid to approach vmax, now I can ride at ~44km/h easily and I can pull the throttle as hard as I can and remain full control and stability (at least until I up the current settings once more 
). Who still has springs: just upgrade, it is worth it. Didn’t lose any turning ability either. These things are just great.
BLE live telemetry and logging app
Pulling logs via USB sucks if the port isn’t easily accessible and it would be nice to check the battery voltage during the ride. So an app would be great. Unfortunately the Arc200 is a pretty niche controller and a discontinued one as well. So no app, just a Windows GUI.
So I made my own telemetry and logging app for the Arc200. The Arc has built in BLE which you can use with the Windows GUI. Unfortunately I didn’t manage to get the Arc to answer my handcrafted messages, neither did it respond to simple replay “attacks” using messages I captured with wireshark. I didn’t want to spend too much time on this and I knew that polling telemetry via UART works (it is documented more or less), so I decided to make my own Metr Pro like UART module using an Arduino and a BLE module.
The Arduino simply polls telemetry packets from the controller via UART, repacks and relays them via BLE in my custom format.
The app itself then only took a weekend. It can do the following:
- Show live telemetry like battery voltage, phase and battery current, throttle and ESC temp
- Record all telemetry packets during rides, export the resulting log to .csv
- Show per ride and all-time stats
- Vibration alarm if battery voltage becomes too low or ESC gets too hot
(the max speed gauge is broken, need to fix that)
When I look at the log from today and remove all data points where the throttle is 0, so I only look at actual riding time, I get the following average values:
- Avg. Motor Current: 15A
- Avg. Battery Current: 8.5A
- Avg Speed: 17.3km/h
Peak values are as seen on the screenshot. Ambient temp was ~6°C so pretty cool but not super cold. The heatsink does a great job apparently, ESC never got above 19°C despite some pretty steep hills and longer ~40kmh sections.
Overall
I am super happy with my board now. All I want to change in the medium term is the lipo battery. It performs well until now, and range is ok (~12-15km) but more is better and I want a li-ion pack some day.
Also I need to print a modded GT2B case because the stock one didn’t like my first real crash 