NA Miata Rear Bar

Doryoku Race Bar’s philosophy of use & design

We designed this to be the best value bar on the market when it comes to weight, construction, design, add on options, price and total value. All bars are designed by scanning the OEM bumper bar/foam/support so that we can ensure the best fit and follow the existing shape. The race bar is intended to provide many performance benefits for track car applications (drag /road race) while allowing the user to customize the bar as they grow in the sport.

 

1989 - 1997 Mazda Miata NA track bar specifications

☆ Direct bolt-on replacement of rear plastic tub

☆ 2.5lbs weight savings over stock 

☆ Roll cage spec steel tubing vs plastic molded bumper 

☆ Integrates with OEM bumper trim bracket 

☆ Includes new M8 mounting hardware

☆ 1.5" 13GA DOM steel tube & 10GA steel plate

☆ Professional TIG weld construction

☆ Zinc Chromate yellow plating

☆ $35 flat rate shipping - up to 2 bars (front & rear) 

☆ Legal in Gridlife, NASA, SCCA , Champcar Endurance Racing , WRL Endurance Racing, Luckydog Endurance Racing & more 

 

Custom Options

☆ Dual coating Zinc + Powder

All bars come zinc chromate plated. I can powder coat matte black over zinc for $35 extra. Please note in "Special Instructions" what color you would like.

☆ Dual Mini Hooks

These welded hooks provide easy access tie-down for dyno or transport on trailer. Dual hooks can welded at any angle, 45*, straight back, or downward. Most commonly is downward. Consulting will be provided before fab.

☆ Hidden Universal tow strap bracket

This welded bracket allows for universal tow straps to be bolted on. Tow strap bracket can be placed on the driver or passenger side. Consulting will be provided before fab.

 

☆ Recessed CNC M12 tow bung

Welded CNC M12 bung allows for thread in style tow strap which is common on modern cars such as S2000, FRS BRZ, BMW, Corvette, Porsche, VW Audi sports cars. We can place this anywhere on the bar (passenger, driver, center behind license plate). Consulting will be provided before fab.

 

☆ Dual M8 pucks for diffuser support rods

M8 pucks make it easy to attach rear aero brackets or support rods.  M8 pucks are placed on the bar based on your setup. Consulting will be provided before fab.

☆ Jackpoint 

The rear diff is the traditional jacking point. The Miata diff is 40" away from the bumper. Most floor jacks are going to have 20-24" of reach (jack pad to lower handle). Super-long floor jacks will have 30-34" of reach but are $500 & weigh over +80lbs. You have to get down to eye level with the diff line up jack; then you still have to go through the motion of doing “micro-pumps” before the car is high enough to get any decent travel from the jack handle. This jackpoint tube eliminates those annoyances while keeping the visual footprint & bumper trimming minimal. If you work on your car constantly, auto-x or track you'll appreciate the ease of working on your car. Standard tube length of 7" and the jack pad extends ¼” below the bumper. Custom length jackpoint are available at no-charge.

 

 

 

Engineering Design Notes

Proper Fitment

The NA Miata rear bar has a mounting provision for the top factory bumper "trim" bracket. The bracket bolts onto our bar and is adjustable so clients can dial in their bumper fitment to their trunk panel. See video. 

 

Maximum Protection

The factory plastic tub leaves a 1.5” gap between bumper and tub. During contact the bumper pushed in resulting in damaged bumpers and bumper mounting tabs tearing off. We designed our bar to hug tightly behind the bumper cover so there is no movement of the bumper during contact. 

Jackpoint

Our jackpoint is engineered for strength with minimal weight. Other companies use triangular jackpoint which add excess weight. We designed a laser cut, CNC bend formed bracket that disperses the load to the bar. The tubular bar with jackpoint still weighs 1 lbs. less than the stock plastic tub.