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Wind Resistant - 1998 Acura NSX

Aerodynamic Performance For Your Acura NSX
April, 2008
By William Law
Photography by Scott Tsuneishi, Steve Demmitt
1998 Acura Nsx Front Bumper
Our '98 NSX received some... 
   
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1998 Acura Nsx Front Bumper
Our '98 NSX received some cosmetic revisions with a '02 front-end conversion. The front bumper is a Downforce fiberglass front bumper, which is a more economical alternative to spending $1,500 for the factory piece.
1998 Acura Nsx Aero Kit
Downforce offers a four-piece... 
   
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1998 Acura Nsx Aero Kit
Downforce offers a four-piece under panel aero kit for the NSX with promising results. Shown here is an image of the under tray, battery tray, gas tank cover and rear diffuser.
1998 Acura Nsx Under Tray And Front Battery Tray
Based on the conceptual aero... 
   
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1998 Acura Nsx Under Tray And Front Battery Tray
Based on the conceptual aero package design from the OEM NSX-R, the Downforce under tray (under the front bumper) and front battery tray is a simple bolt-on procedure that takes no more than one hour. Both the Downforce front tray (under the front bumper) and front battery tray was designed off of the OEM NSX-R piece.
1998 Acura Nsx Loosen Factory Lip Spoiler
Loosen the factory lip spoiler... 
   
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1998 Acura Nsx Loosen Factory Lip Spoiler
Loosen the factory lip spoiler using a 10mm socket and extension. Using the factory mounting points, the Downforce under tray slides easily into place and is securely fastened before installing the coinciding battery tray.
1998 Acura Nsx Front Bumper Tray
The front bumper tray is constructed... 
   
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1998 Acura Nsx Front Bumper Tray
The front bumper tray is constructed of handlaid fiberglass. The tray is finished in a dark gel coating so that it can be painted if the owner wishes to do so. The Downforce under tray and battery tray work in conjunction to completely seal up the front under paneling of the car to reduce turbulence and channel a smoother passage of air. The purpose is to contain any airflow passage between the bottom of the car to the mouth of the front bumper openings. This will create a greater lower pressure area and enhance the downforce available without creating parasitic drag.
1998 Acura Nsx Downforce Front Battery Tray
The Downforce front battery... 
   
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1998 Acura Nsx Downforce Front Battery Tray
The Downforce front battery tray is constructed of sturdy aluminum paneling and uses all of the factory bolt locations to mount in place.
1998 Acura Nsx Battery Tray Fastened
Installation of the front... 
   
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1998 Acura Nsx Battery Tray Fastened
Installation of the front under tray and battery tray will provide an improvement of -0.040 coefficient of lift over factory specifications to the NSX not using both pieces. These data numbers were wind tunnel tested by Honda Motor Co. Japan's test of the NSX-R. To briefly explain aerodynamics without needing a degree in physics, the term negative lift refers to providing more downforce to the vehicle, increasing the load to the front or rear tires depending on how the vehicle is setup. This increased load improves the lateral g-force allowing for more traction and better cornering abilities.
1998 Acura Nsx Downforce Gas Tank Cover
The gas tank cover offered... 
   
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1998 Acura Nsx Downforce Gas Tank Cover
The gas tank cover offered by Downforce was modeled after the Mugen fuel tank cover, which sells for approximately $5,000 in Japan. The fuel tank cover was designed to enhance airflow by extending the flat surface underneath the NSX even further to prevent turbulence from building underneath the vehicle. The idea is to have airflow under the car as smooth and fast as possible. Anytime you have drag or turbulence it creates a mini vortex vacuum that will pull the car backwards causing a parasitic loss.
1998 Acura Nsx Installing Downforce Gas Tank Cover
Caption10The Downforce gas... 
   
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1998 Acura Nsx Installing Downforce Gas Tank Cover
Caption10The Downforce gas tank cover, constructed from a fiberglass material, can be installed using the supplied bolts and screws. The aerodynamic also protects your fuel tank from road debris and foreign objects that may dent or puncture the fuel tank.

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