> For the complete documentation index, see [llms.txt](https://docs.t1ger.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.t1ger.net/resources/t1ger-tuning/guides/nitrous.md).

# Nitrous

Nitrous gives your vehicle a powerful, risky speed boost — but getting the most out of it means mastering the purge/burst system, not just holding a button.

## Installing a Nitrous Kit

Nitrous kits are installed through the tuner shop's **Tuning Bay** menu. Select a kit size from 1lb to 12lb — larger kits hold more shots (10 shots per lb) but cost more. Upgrading an existing kit to a larger size only charges the difference in price.

Once purchased, a short installation sequence plays at the vehicle — the hood opens, the kit is carried and fitted, and the kit becomes active once complete. A freshly installed kit starts empty and needs to be filled with NOS bottles before it can be used.

## Burst Kits

Every nitrous kit comes with a stock burst kit that allows up to 5 seconds of purge or burst before extra risk kicks in. Burst kits can be upgraded through the same Tuning Bay menu, raising that threshold to 7, 10, or 13 seconds — giving more room to build efficiency and hold a longer burst.

## Refilling Shots

Nitrous kits run on shots (10 per lb). There are two ways to keep a kit topped up:

* **Full bottles** (`NOS 10-Shots`) — use the item while seated as the driver, stationary, to add shots directly to the kit.
* **Empty bottles** (`NOS Empty`) — can't be used directly. Bring them to a NOS refill station (marked on the map for tuners) and exchange them for full bottles.

Both bottle types can be crafted at a tuner shop's workbench, or purchased through the shop supplier.

## Using Nitrous — Purge & Burst

Nitrous isn't just "hold a button and go fast." It's built around a risk/reward loop:

**Purge** (default key: `Right Ctrl`) — while stationary, hold purge to build up efficiency. The longer you hold it (up to your burst kit's threshold), the more efficiency you earn, up to 100%. Releasing purge opens an efficiency window — your burst will draw on whatever efficiency you built, for a limited time.

**Burst** (default key: `Left Shift`) — while driving, hold burst to apply a torque boost. The strength of the boost scales with your current efficiency:

* **Purged first, used within the window** — strongest, safest boost
* **Burst with no purge at all** — weak boost, and a high chance of engine damage
* **Burst after your efficiency window has expired** — reduced efficiency, moderate damage risk
* **Held past your burst kit's threshold** — very high chance of engine damage, regardless of efficiency

Each second of burst held consumes one shot. After releasing, a cooldown begins equal to how long you held it — so you can't just spam burst repeatedly.

## Gas Leaks

If you purge again during the post-window cooldown before a new efficiency cycle can start, you're gambling — there's a chance of a gas leak, which vents a portion of your shots and produces a visible steam effect. Wait out the cooldown to purge safely again.

## Purge Dye

Want your purge smoke a different color than the default white? Use a `NOS Purge Dye` item at the vehicle's engine bay to permanently recolor the purge effect for that vehicle.

## Engine Health

Nitrous requires a minimum engine health to activate at all — a badly damaged engine won't let you burst or purge until it's repaired.