But smoothing the airflow has a slight detrimental effect of increasing the lift generated by the roof. The rear interior of the soft top can also pressurize caused by air flowing into the open windows and flap around which can disrupt airflow over the top.
Removing the soft top and it's extension mechanism will also reduce the cars weight. Extending the S's leading edge of the bumper downward buy installing an air dam would be very beneficial. Air dams create a very low pressure area behind them which creates downforce and they also reduce the airflow under the car which decreases drag. The combination of an air dam and splitter is even better see Miata Aerodynamics below. Putting a spacer between the bumper and splitter is the easiest way to accomplish this on the S A rear diffuser must run very low to the ground to be effective so for an S to truly benefit from a diffuser it needs to be very low and run a very stiff suspension.
Smooth airflow under the car will also greatly improve the effectiveness of a diffuser so a flat under tray is desirable.
Combine a flat bottom with a little forward rake and you can create a diffuser effect. You can also screw up your engine, transmission and differential cooling airflow if you don't know what you're doing. When run low enough a flat under tray will produce downforce. Flat under trays are expensive and must be removed to perform most under car maintenance.
I added a small central hood vent to take advantage of the low pressure area over the top of the hood. The low pressure helps extract hot radiator airflow from the engine bay and should help increase the airflow through the radiator.
The S tends to run very hot oil temperatures on track so extra cooling is a good thing. The hood vent will also reduce the lift generated by the hood and should also help clean up the airflow under the car because less engine compartment air is forced to flow out the bottom of the engine bay.
Adding radiator ducting to direct radiator outflow up to a large hood opening can have a dramatic effect on undercar downforce and drag. Overall a hood vent is a win-win-win modification. Brake ducting greatly enhances brake pad life and reduces the possibility of brake overheating and fade. My interior panoramic rearview mirror gives a very good view of the right side of the car so I removed the passenger side rearview mirror reducing weight and drag.
I'm considering adding some small aluminum dive planes to the front bumper. With so much lateral air flow around the S's nose the dive planes should work well to add some downforce to help balance the rear wing's downforce. Because of the high speed horizontal airflow along the outside of the front bumper the "dive planes" on the CR bumper most likely are very functional and do add downforce. The bumper extensions also help block airflow around the front tires to reduce drag. I considered venting my rear bumper to allow wheel well and underbody air to flow through.
I did some testing with the rear bumper cover completely removed and my top speed was not affected at all so I decided not to bother cutting up my bumper. This would allow the rear wing to get much cleaner air resulting in a more efficient wing run a flatter wing with less drag. The Fastback hard top also has a nice lip spoiler that would tend to add some downforce and possibly reduce drag.
Of course the Miata isn't a perfect match for the S but it's close enough to glean some good info. Stock first generation Mazda Miata 2. Stock Mazda Miata lowered to a 4 inch Ride Height 3. Large Air Dam at 4in Ride Height 6.
The following text in this article is by Rob Robinette. If you don't win, the pre-authorization will be released. For more info, read about our auctions or email us with any questions. Are you sure you want to proceed? This Honda S got away, but there are more like it here.
See Result. BaT History 1 entry Email me if this is listed again. Winner: BaT Video of the Year. March 23 - 25, August 12 - 14, Load additional live auctions. Current Bid: None Ends in:. View all Live Auctions. Advertise on BaT. Make your initial wing angle adjustments by turning the barrel nuts simultaneously on the Adjustable Rods, then snug down the Adjustable Rods' lock nuts and you're done.
Update June The left side of my trunk lid began to get pushed down by the down force generated by the wing. I now use two 1 inch square rubber "feet" designed for the underside of electronics to reinforce the trunk lid support. The rubber feet are peel and stick. You will be able to see where the stock trunk lid rubber supports ride on the brake light housing.
Simply stick two of the rubber feet on the wear mark. Closing the trunk lid is a little harder now. I hold both wing supports with my hands and use them to lower the trunk lid. Bumper weights 10 lbs. Description S Spec-Js 35mm Front Aero Fenders These fenders are produced with an FRP outer construction for easy sanding and painting and further reinforced with structural grade carbon fiber for added strength. Description Spec-S Rear Headlight Cover Liners Running wide front fenders usually requires the removal of your OEM fender liners leaving certain areas exposed to dirt, water, and other debris.
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