YAMASHIRO ALPACA (KT10-A, 2026) 4WD, 5MT
Kei truck
Rank: I

Thumbnail mirror (x)

USER MANUAL

NOTICE

• The truck starts in neutral. If the engine revs but the wheels do not move, the truck is in neutral.
• Gear stick is not implemented as a physical control as there is no good way to use it in flat screen mode (cannot see the stick), or VR mode (no feeling of physical grooves).
• Steering assist (reduction of steering angle at higher speeds) does not apply to VR steering wheel controls.
• Handbrake is not suitable for use at speed. (Jandrewson gib wheel brake input controller pls)
• Nurburgring test version with different gearing and suspension settings

CONTROLS

Normal game mode:
Pitch - Engine throttle
Roll - Steering
Yaw left/right - Shift down/up
Activate1 - 4WD mode
Activate2 - Low range gearing
Activate3 - Linear steering mode (for external wheel use)
Activate4 - Handbrake
Activate5 - Pickup bed light
Activate6 - Fog lights
Activate7 - Headlights

VR game mode:
Steering wheel left side trigger: Brake
Steering wheel left side grip: Shift down
Steering wheel right side trigger: Engine throttle
Steering wheel right side grip: Shift up

Functions only available through physical actions:

• Doors, tailgates and tailgate supports
• Indicator and hazard lights
• Sun visors

COCKPIT

In addition to the steering wheel, the indicators and headlights can be controlled. Kei trucks, including this one, usually do not come with a tachometer from the factory, so an aftermarket one is bolted on.

Many other controls can be found in the center. (Note that shifting gears is done using Yaw or grip controls on the steering wheel.)

EDIT GUIDE

Material guide:
0: Body
2: Rims
10, 11, 19: Interior
18: Main displays
21: Rear decal

Recommended body colors:
(#104060, m=0.90, s=0.50) Dark blue (copy of NOCTURNE BLUE ZJP)
(#C8FFD4, m=0.90, s=0.50) Mint (copy of ICE GREEN G62)
(#FF6000, m=0.90, s=0.50) Orange (copy of TONIC ORANGE R71)
(#C0C0C0, m=0.90, s=0.50) Silver (copy of BRIGHT SILVER S28)

Funky trees:

• Steering assist: In InputSteering setter, change 5 to another value. A greater value will lower steering at high speeds.
• Gear ratios: Change values in GearRatio setter. The first value is the final drive ratio, so try it first.
• Engine performance: Change MaxEngineInput setter for torque, and MinEngineInput for engine braking strength. These are defined as a series of straight lines.

DEV COMMENTS

Exceedingly boxy small truck built according to Japanese keijidosha (light car) specifications. As a small car enjoyer for a while, I finally went to make one.

Completed sketchbook page

Most specifications are taken from the two current designs, the Daihatsu Hijet Truck (S500, S510), and the Suzuki Carry (DA16T). The gear ratios (except for final drive) are taken from the somewhat cringe Hijet 5MT system. The torque curve is slightly modified from the Midget II in Tokyo Xtreme Racer Drift 2, so that it has more of a hill. From my provided Desmos graph, you can find peak power at 5100 RPM. The overall feel of driving a kei truck references the Suzuki Carry (older one) in the same game. My truck is slightly better in some ways like bed length and turning radius, but I don't have to deal with any actual engineering.

Car engines in SP produce torque proportional to input. However, from early testing, it appears that the maximum torque is greater at low speeds, before a constant response is reached at high speeds.

There is a very cool (subjectively) tailgate logic system and chain link animation. I made it by writing a very simple chain simulator to generate keyframes and using Excel to produce equations. Remember to use at least 3 s.f. for all multipliers. Surprisingly, they have a noticeable effect even for coefficients as small as 1e-6.

I built with a lot of precise geometry, starting with the frame and bed. I learnt more tricks and established some of my own design conventions for the cabin front, so it is more detailed and also looks different in terms of corner shapes. I've always noticed that different surfaces at the same angle will blend together, so rounded corners are used wherever possible. However, close to the end, my phone was starting to lag and I was also running the risk of reaching high performance cost, so the quality of later objects may be lower.

License plates and the rear decal are imported using SP Label Converter by PlanariaLab, using the Binary mode. These images are very lightweight, but I still adhere to my old recommendation of 10,000 pixels per image.

In addition, the license plates use work from ItsNickkk on GitHub. Large numbers are mostly as generated, but I redrew the small text to make them work better on the Binary label mode. It doesn't actually have Yamanashi as a registration office, but it has Fuji-san.

Of course I took it on the Nordschleife, but due to having no downforce and a very aggressive front grip setup, it will flip or spin a lot if you even just look at any of the bumps there (which you usually can't see).

No lore dump as this build doesn't have any. However, the ALPACA truck line has existed long before the company LLAMA HEAVY INDUSTRIES entered the truck market.

Finally, using the name "Yamashiro" is a joke on two levels. I refuse to explain it, but will still state that it requires basic knowledge of both the land and sea. This company may or may not return in the future - it is one of few engineering companies in the timeline to exist both long before and long after the great shift in the world order.

Extras
Chain simulator (CHAINS.PDE) and related files
Funky engine documentation
Multi Output/RPM (Desmos graph)

Resources
[EN] Keitora: Tiny Trucks - NHK WORLD JAPAN - The video that made me do it
[JP] Daihatsu Hijet Truck Catalog
[JP] Suzuki Carry Catalog

weird reference to a well-known song with synthesized vocals: