Miata Floor Pan Removal: A Step-By-Step Guide

how to drop floor pan in miata

Dropping the floor pan in a Miata is a modification that can be made to accommodate taller drivers. This can be achieved by purchasing a floor drop kit, which typically includes a floor drop plate, replacement floor stiffener, hardware, and installation instructions. The process involves welding and fabricating, and it is important to ensure that the installation is done correctly to maintain the integrity of the vehicle. Some companies, such as Advanced Autosports and Hanks Hot Rods, offer kits that can be installed by individuals with the necessary tools and skills. Additionally, there are DIY options available for those who prefer to custom-make their own floor pans.

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Floor drop kits

There are a few different options when it comes to floor drop kits for the Miata. One popular option is the Advanced Autosports Spec Miata Floor Drop Plate Kit. This kit includes a floor drop plate, a replacement floor stiffener, hardware, and installation instructions. The plate is CNC cut from 16-gauge (.060") steel as per the latest SCCA rules and is designed to lower the floor and seat by 1.25 inches. This kit does require welding and some fabricating skills for installation. Another option is the Hanks Hot Rods Floor Kit, which is also designed to lower the floor pan. The HHR kit is said to be more expensive than the Advanced Autosports kit, but it is not clear if it includes the same components or requires the same level of fabrication.

In addition to these kits, there are also custom kits available, such as the one mentioned in the Miata Turbo Forum. This custom kit includes CAD, CNC cut, bent components, and weld nuts, among other features. It is designed to accommodate different steering wheel positions and includes provisions for additional safety measures, such as Corbeau double-locking sliders.

It is important to note that installing a floor drop kit requires some level of fabrication and welding skills. While it is possible to install a kit without these skills, it may be more cost-effective to hire a professional welder to ensure a safe and proper installation.

Overall, floor drop kits can be a great option for those looking to gain more headroom in their Miata. With a variety of kits available, it is important to research and understand the installation process to ensure a safe and successful modification.

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Welding techniques

Welding is a critical step in the process of dropping a floor pan in a Miata. It is important to ensure that the welding is done correctly to achieve a secure and aesthetically pleasing result. Here are some welding techniques and considerations to keep in mind:

Firstly, it is recommended to use thicker metal for the floor drop kits compared to the original floor. This provides added strength and stability. The metal can be cut, bent, and welded to fit the required shape.

When it comes to the actual welding process, there are different techniques that can be employed. Some people choose to drill holes and plug weld, which involves drilling holes at specific points and then welding through those holes. This technique provides a strong bond and is often used in combination with lap welding, where the weld is applied along the seams of the metal. It is important to take your time and ensure that the welding is done neatly to achieve a clean and secure finish.

Another technique mentioned is grinding down welds, which helps to smooth out the welds and create a seamless finish. Seam sealing and painting are also important steps to protect the welds and ensure the floor pan is protected from the elements.

Additionally, it is important to consider the type of welding equipment used. A MIG welder is mentioned as a suitable option for welding the floor pan, and it is estimated that the welding process could take about half a day with the right equipment and preparation.

Finally, it is crucial to be cautious and take your time during the welding process to avoid warping the floor pan. This can be a delicate procedure, and attention to detail is essential to ensure a successful outcome.

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Height and headroom

The height of a Miata's floor pan can be adjusted to accommodate taller drivers. This modification is especially useful for those with a tall stature who are looking to gain more headroom. The process involves installing a drop floor, which lowers the floor and subsequently the driver's seat. This adjustment provides much-needed additional space for taller individuals.

The Spec Miata Floor Drop Plate Kit is one option that can be used to achieve this modification. The kit includes a floor drop plate, replacement floor stiffener, hardware, and installation instructions. It is designed to lower the floor and seat by 1.25 inches, significantly improving headroom.

When installing a drop floor, it is important to consider the strength and durability of the modification. The replacement metal should be thicker than the original floor to ensure it can withstand any impacts. Additionally, the installation should be done correctly, with proper welding techniques to avoid warping the floor pan.

One concern with installing a drop floor is the potential for it to come into contact with the ground, especially considering the vulnerability of the OEM "frame rails" to bending and damage. However, this concern is outweighed by the significant gains in headroom, and it is recommended to build a strong skid plate to address this issue.

Another factor to consider is the design of the cage and seat installation, which can impact the comfort of the driver. The tight confines of the Miata can make this challenging, but careful planning and utilisation of SLIDERS can help achieve a comfortable and spacious driving position.

Overall, dropping the floor pan in a Miata is a viable option for taller individuals seeking more headroom. With careful installation and consideration of potential challenges, this modification can significantly improve the driving experience for taller drivers.

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Safety considerations

Safety should be a primary concern when dropping the floor pan in a Miata. Here are some detailed safety considerations to keep in mind:

Firstly, ensure that you are using the correct equipment and that it is properly installed. The floor drop plate kits available on the market are designed per the latest SCCA rules and use thicker metal than the original floor, making them stronger when properly installed. It is crucial to follow the installation instructions carefully, especially during welding, as it is easy to warp the floor pan if not done correctly.

Secondly, address any concerns about headroom. While the drop floor can provide more headspace, it is essential to consider the risk of the drop floor coming into contact with the ground. This can be mitigated by ensuring that the drop floor is built strong and functions as a skid plate.

Additionally, pay attention to the bolts used during installation. It is recommended to keep the bolts short to avoid any issues.

Finally, consider the overall safety of the vehicle after the floor pan is dropped. The floor drop should not compromise the safety of the driver or passengers. Ensure that the drop floor is compatible with the roll cage, seat belts, and other safety features of the Miata.

By carefully considering these safety aspects, you can ensure that dropping the floor pan in your Miata is done securely and effectively.

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DIY options

There are a few DIY options for dropping the floor pan in a Miata. One option is to buy a kit and install it yourself. These kits typically include a floor drop plate, a replacement floor stiffener, hardware, and installation instructions. However, some fabrication skills may be required, particularly for sheet metal fabrication.

Another option is to create a custom kit. This involves using thicker steel than the factory pans, which will add strength and stability to the floor pan. You can also add features like welded-on ribs to give the panel more vertical support. When welding, it's important to take care not to warp the floor pan and to use tack welds all the way around before you start welding to avoid putting too much heat into it.

Additionally, you can follow the steps shown in the installation videos on YouTube by 5XR, which demonstrate the process of installing a 5X Racing Mazda Miata Drop Floorpan Kit. This kit includes front and rear lips for added strength and step-by-step instructional videos to guide you through the installation process.

It is important to note that proper installation is crucial to ensure the safety and stability of the floor pan. If you are unsure about any aspect of the process, it may be best to consult a professional or seek advice from experienced individuals.

Frequently asked questions

A floor pan drop is a modification made to a car to accommodate taller drivers. It lowers the floor and the driver's seat to provide more headroom.

There are several kits available to drop the floor pan in a Miata, including the Advanced Autosports kit, the Hanks Hot Rods kit, and the 5X Racing Mazda Miata Drop Floorpan Kit.

The installation process for a floor pan drop kit can vary depending on the kit and your vehicle. Some kits may require welding and fabricating, while others offer step-by-step instructional videos to guide you through the installation process. It is recommended to refer to the specific instructions provided with your chosen kit.

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