WangSpec JZA80 Supra Airbox Development Part 3: 3D-Printed Aluminum Prototype, Bottom Access, and Testing

A lot has changed since the last airbox update.

The original concept is still the same: build a sealed airbox system for serious single-turbo JZA80 Supra setups, using the available engine bay space as efficiently as possible while keeping the design clean, serviceable, and visually worthy of a high-end build.

But the production version has changed significantly.

Since Part 2, the airbox has essentially been rebuilt again. The overall idea still looks familiar from the outside, but many of the production-critical details have been updated: material selection, radiator snorkel design, mounting strategy, internal geometry, rear heat shielding, air filter selection, and now the bottom access panel.

The short version:

The concept stayed the same, but almost every production-critical detail changed.

Moving From PA12/SLS to 3D-Printed Aluminum

Earlier in development, we were evaluating PA12/SLS-style materials for the airbox body.

That route made sense on paper. SLS (Selective Laser Sintering) and MJF (Multi-Jet Fusion) can produce complex geometry without traditional FDM support scarring, which is important for an intake component with internal airflow paths. It also avoids the tooling cost of injection molding.

After deeper quoting and design review, SLM aluminum became the stronger direction for the main airbox body.

While PA12/SLS remains a viable manufacturing option, the aluminum version gives us a stronger long-term foundation for the direction of this kit. It allows thinner wall sections in key areas, helps preserve internal cross-section through the integrated intake paths, and removes many of the aging and fatigue concerns associated with plastic components in a hot engine bay.

The aluminum version is roughly only one pound heavier than the plastic equivalents we evaluated, but the tradeoff made sense for a low-volume premium part.

Plastic can be excellent from a thermal standpoint, but plastic components in a hot engine bay still have fatigue life, aging, and long-term durability considerations. Moving the main body to aluminum removes the plastic-aging concerns, and provides us with a longevity that exceeds stock.

This airbox is expensive to make, but the goal was never to build the cheapest intake box possible. The goal was to build the version we would be proud to put on our own car.

Radiator Snorkel Redesign

The radiator snorkel has also been redesigned.

The earlier version worked as a concept, but the newer design takes a straighter, shorter path, and improves clearance around modern electric fan/large radiator setups.

The Air Entry is now also aimed closer towards the center of the Air Filter.

The updated radiator snorkel is intended to improve packaging while keeping the air path cleaner and more direct. The simplistic approach has also improved appearance.

The new radiator snorkel now uses a silicone coupler instead of an O-ring interface, giving it better misalignment tolerance and vibration resistance.

The Final Production Model will be produced in SLS PA12 Glass Fiber.

Rear Radiant Heat Shield

A rear radiant heat shield has been added to the airbox.

This shield sits behind the airbox body with an air gap between the shield and the box itself. The goal is to reduce radiant heat exposure from the hot side of the engine bay while maintaining serviceability and packaging clearances.

Separating the shield from the main body helps limit direct conductive heat transfer into the airbox body while preserving the radiant barrier effect of the shield and air gap.

Updated Mounting System

The airbox mounting system has also been revised.

Instead of relying only on rigid mounting, the current design uses two high-temperature silicone sandwich mounts to help isolate vibration, reduce cyclic loading, reduce fatigue, and limit noise.

Additionally, we also added two rubber anti-rocking floor bumpers to stabilize the box and reduce unwanted movement, and reduce vibrations even further. The isolated mounting strategy also helps reduce vibration transfer into optional accessories mounted to the airbox, such as the IAT sensor.

The goal is a more isolated, more durable mounting system that feels and performs like OEM during installation and use.

Bottom Access Panel and Optional 4th Air Entry

One of the final major updates is the bottom access panel.

Originally, the floor geometry was more focused around manufacturability and internal structure. As the design evolved, we opened up the bottom of the airbox and turned that area into a more useful feature.

The bottom access panel now does two things.

First, it helps with manufacturing and inspection. It gives better access to the internal geometry for post-processing, cleaning, bead blasting, and final inspection before assembly.

Second, it gives the airbox optional lower air entry capability.

For unmodified chassis, the kit will include a block-off plate and gasket so the airbox remains sealed.

For more aggressive builds, or cars that already have a lower opening in the airbox area, the bottom access can support an optional bottom-fed duct/snorkel path.

This gives the customer flexibility without forcing anyone to cut their car.

Filter Update: AFE Standard

Air Filter Selection has been finalized for an AFE Pro 5R Air filter.

The AFE profile works well with our packaging constraints and internal airbox geometry. It is also highly regarded for filtration performance in off-road and performance applications.

It also features an inverted top-entry design that also improves it's performance over typical cone air filter.

The filter is serviceable and will be included as part of the standard kit.

 

IAT Sensor Provision

An optional IAT sensor provision has also been added.

The airbox now includes an anti-rotation hex pocket and bung location for an optional IAT sensor. This gives customers an option if they wish to monitor air temperature inside the airbox directly.

The sensor selected for this option is a modern Rife IAT sensor, chosen for its fast response time.

Internal Geometry and Bell Mouth Update

The integrated intake geometry has also been revised.

Each airbox variant now combines a custom-profile bell mouth with an internal taper through the integrated intake path. This taper changes by version so the airbox can better match the intake size and turbocharger setup it was designed around.

- Type A, and Type B use a 5-inch air filter and taper toward a 4-inch outlet for customers running 4-inch intake tube configurations. 

- Type B has an outlet angle that is optimized to ease the intake tube path for forward facing Single turbo kits.

- Type C is designed for larger-frame turbocharger setups, like builds using a 5-inch compressor inlet. It uses a 6-inch air filter and tapers toward a 5-inch outlet to better support larger 5-inch intake tube fabrication. 

The Intake outlet angle on Type C, is the same as Type A.

The goal is to keep the transition into the intake path as smooth as possible within the packaging limits of the Supra engine bay.

Before locking these geometries into aluminum production, we are also printing key intake sections separately across all models, so we can physically inspect the internal short-turns.

CAD is useful with it's curvature analysis tools, but there are still certain surfaces you want to physically confirm before committing to metal.

Rigidity and Structural Reinforcement

Utilizing FEA Analysis & Simulation, the main airbox body has been updated with strategically placed internal and external ribbing to improve rigidity without simply adding wall thickness everywhere.

Since the production body is now being developed around 3D-printed aluminum, we were able to reduce wall thickness in selected areas to reduce weight. The ribbing was then used to reinforce higher-load regions and distribute stress more evenly across the body.

We also reviewed the updated geometry in many simulations under high-vacuum load assumptions to monitor stress concentration and deflection across both the interior and exterior of the airbox.

This approach lets the airbox stay relatively lightweight while still giving the airbox body the structural support needed for excellent longevity.

What Comes Next

We still need to complete:

• heat cycling
• road testing
• IAT/logging data

The goal right now is to finish the production-ready version, validate fitment, and collect real data.

This project has taken much longer than expected, and sometimes you think you know what you want. The silver lining is the end result is significantly improved over it's previous iterations due to all of the additional trial, errors, and real world considerations.

The airbox is no longer just a concept. 

Utilizing modern manufacturing techniques, it is becoming a real, low-volume, first of it's kind, aluminum air box system built for hardcore JZA80 Supra setups.

Our goal isn't just to create a product.
We wish to make a dent in the universe of the platforms that we love.

Shout Outs

Credit goes to:

@Supra_Amir
@BigOMotorSports

For bringing the bottom fed entry to my attention. 

I had considered this feature earlier in development, but their feedback helped bring it back into focus and pushed us to turn it into a more useful production feature.