Description

Air Intake System — INEOS Grenadier

EF Expedition.co — Australian‑Engineered Raised Air Intake System

Overview

Our Air Intake System for the INEOS Grenadier is now ready. We currently offer local installation only, with DIY shipping kits coming soon. A full installation video is in production.

This system has been designed from the ground up to meet two critical requirements:

• True raised air intake from a high mounting position
• No reduction in airflow compared to the factory RAI system

It also features a dual‑configuration design, allowing you to switch between an “around‑town” setup and a full off‑road configuration depending on your needs.

Key Features

• True raised air intake
• Maintains OEM airflow requirements
• High‑mounted joint for maximum reliability
• Wing‑top routing to preserve cross‑sectional area
• Dual‑configuration system (street / off‑road)
• Designed for DIY installation
• Engineered specifically for the INEOS Grenadier
• Built in Queensland, Australia

Supporting Research

Independent studies show that air filtration performance improves when the intake is raised above the wheel arch.

A raised intake reduces dust ingestion and improves filter life — especially in convoy or outback conditions.

( please see the links below for more information )

Engineering Notes — Design Rationale

You might be wondering how we arrived at this design. At first glance it looks unusual — some people love it, some don’t — but every part of it comes directly from the engineering constraints we had to meet.

The Two Rules

Rule 1: It must be a true snorkel, pulling air from a raised position. Rule 2: It must not reduce airflow compared to the factory RAI system.

These two rules defined the entire project. They gave us two fixed points:

• A: Where the intake must begin
• B: Where it must end And with the cross‑sectional area of the original RAI head as our baseline, we knew the minimum area the ducting had to maintain.

Why We Didn’t Follow the Original RAI Path

The obvious route was simply to follow the factory RAI down the A‑pillar. But then came the “what ifs” — and I ask a lot of them.

What if the joint through the wing fails? If that happens, you’re back to square one. That option was ruled out immediately.

We needed the joint as high as possible.

For a while, I couldn’t see a viable route that met both rules — until Darren at our local service centre suggested running along the top of the wing. I hadn’t considered it, but the more I looked into it, the more sense it made.

Trying to run inside the wing is almost impossible if you want to maintain the required cross‑sectional area. That forced the design to follow the top of the wing, and Rule 2 dictated the shape.

Airflow and Shape

The turn from the A‑pillar is tall to preserve area, then transitions into a flatter, wider profile as it moves forward. This was the hardest part of the design — keeping the airflow area while shaping something that looks balanced on the vehicle.

In the end, we achieved a good compromise that meets both engineering rules.

Cross‑Sectional Area Reference (approx.)

• 3″ pipe — 4429 mm²
• 4″ pipe — 8027 mm²
• OEM RAI intake pipe — 9555 mm²

This is why you can’t physically fit a 100 mm (4″) round pipe inside the wing. And when you look at the original ducting, you can see why its shape is so complex — it’s all about maintaining airflow.

Future Testing

We’ll be putting vehicles on a dyno soon to gather data and confirm performance. As long as our system meets the original airflow requirements, we’ll be satisfied — and we wouldn’t be surprised if it exceeds them slightly.

“Installation Notes”

DIY kit available soon

Full installation video coming

Designed for home installation with basic tools

Supporting Research & Filtration Studies

There are some good YouTube video’s where they present the information quite well.

Although this is primarily about cold air intakes, the information in regards standard air filters is relevant to what we are doing.

https://www.youtube.com/watch?v=NHHdApd_kJk

https://www.project200.com.au/dm-iso5011/#google_vignette-

https://www.sciencedirect.com/science/article/pii/S2212017316301475

https://www.researchgate.net/publication/290052838_Discriminating_Tests_for_Automotive_Engine_Air_Filters

https://saemobilus.sae.org/papers/effect-air-filter-condition-diesel-vehicle-fuel-economy-2013-01-0311