Bastionaire 1.0

Bastionaire
Air suspension, drive modes and an all-terrain tyre for the Bruckell Bastion.
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The Bastion gets an air suspension that actually knows what it is doing: ride height in real centimetres, spring and damper rates that move independently of it, and five drive modes that command all of it. Plus a set of optional all-terrain tyres.

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What is in it

Three air suspension parts

• [BASTIONAIRE] 1 of 3 - Front Air Struts
• [BASTIONAIRE] 2 of 3 - Rear Air Springs
• [BASTIONAIRE] 3 of 3 - Adaptive Rear Dampers

Fitted on their own they are neutral: factory ride height while running, parked low with the ignition off. Nothing else changes.

One drive modes part

• [BASTIONAIRE] Drive Modes - Air Suspension

Goes in Driving & Safety Electronics > Drive Modes. This is what adds the modes, the parked height adjustment and every slider.

All-terrain tyres

• Halden Trailcut A/T - 275/40R20, for 20x9 wheels
• Halden Trailcut A/T - 245/45R20, for 20x8 wheels

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The drive modes

• Comfort - factory ride height. Stock calibration, untouched.
• Sport - -3 cm. Firmer springs and bars, sport damping.
• Off-Road - +9 cm. Soft springs, very soft bars, long travel.
• Custom - Pre-calibrated using Claude's suggestions, but you can change to whatever you want through its 26 sliders.
• ESC & TC Off - -3 cm. Sport mechanically, electronics off.

Every number is anchored in a factory Bastion part. Sport uses the ratios of the sport struts, springs and anti-roll bars; Off-Road uses the rally spring rates. Nothing was copied from another car.

Off-Road runs softer springs with more rebound damping, not the other way round. A tall car on stiff springs with light damping is a pogo stick - the compliance comes from travel and damping, and the articulation comes from the bars going loose.
Careful with speed, though. It's a suspension calibrated for expedition and going through rough terrain. Jumps can cause the oilpan to get damaged, and going sideways at speed can cause a rollover.

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Custom mode

Ride height is in metres, from -0.07 to +0.12, and the response is linear the whole way. Change a spring rate and the height stays where you put it - the rake correction is automatic.

• Suspension - height, spring rates, anti-roll bars, and five damping parameters per axle
• Electronics - traction control, stability control, ESP sensitivity, AWD lock
• Powertrain - gearbox mode, boost offset, exhaust loudness and gain, launch control
• Display - instrument cluster layout

Every tooltip carries the reference value of each preset, so you always know where you are relative to the factory calibration.

AWD Lock deserves a word. The Bastion's all-wheel drive is not a centre differential and not an LSD - it is an electrically clutched torque splitter, and the rear axle is always the primary one. This slider is the minimum clutch engagement, not a torque split: 0% drives as rear-wheel drive until something slips, 100% keeps both axles coupled. The system still releases the clutch on its own while braking or off throttle.

Boost Offset needs a turbocharged engine. Gearbox Mode needs a gearbox with modes. Both tooltips say so.

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Halden Trailcut A/T

There is no all-terrain compound above 18 inches in the base game, so this is a purpose-built one for 20-inch wheels.

The carcass is copied verbatim from the factory sport tyre of each size - every structural value is untouched. Only the compound and the node weight changed. The tread coefficient goes from 0.50 to 0.72, and the load sensitivity drops, so the tyre holds its grip better under load than a road tyre does.

Honest note: a real all-terrain tyre loses to a sport tyre on tarmac. This one does not - it sits a couple of percent above, and the advantage grows with load. Call it a next-generation compound and enjoy it, but it is deliberately optimistic, not a simulation of a real A/T.

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Installation

1. Fit the three air suspension parts.
2. In Driving & Safety Electronics > Drive Modes, choose [BASTIONAIRE] Drive Modes - Air Suspension.
3. Tyres are optional and independent - pick them in the tyre slots if you want them.

The Stability Control, Traction Control and ABS sub-slots stay untouched, so any combination of those keeps working.

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Possible conflicts

• Other drive mode mods for the Bastion. This adds one more option to the same slot rather than replacing the factory part, so they coexist - but you can only run one at a time. The coupe body mod, for example, adds two of its own there.
• Other mods that add Lua under vehicles/bastion/lua/. Two mods sharing that tree can silence each other's controllers. If something stops updating after installing another Bastion mod, that is the first place to look.
• The tyres appear on any vehicle with 20x8 or 20x9 tyre slots, not only the Bastion. They live in the shared tyre folder, which is how the game organises tyres.

No official file or part is replaced. Everything is an additional optional part.

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Part names are original and the mod is not affiliated with any manufacturer. Vibecoded by GTMoraes with Claude.
It has been tested, but bugs may still be lurking — if you find one, or if you have a suggestion, just leave a comment.