Which cars do the Street Zero A Coilovers for FC3C fit?

Cusco USA lists part number 420 61N CN for the Mazda RX-7 (FC3C, FC3S, 1986-1991). The Street Zero A Coilovers for FC3C kit comes with 7 kg/mm front and 6 kg/mm rear springs, so check the notes on this page for any model or year limits before ordering.

How is the damping adjusted?

Each damper carries a 40-step adjuster. Turning it changes the damping force, so the car can be set softer for the road and firmer for the track. Start from the middle of the range. Make changes in small steps, one end of the car at a time, and note each setting so there is always a baseline to return to.

How much lower will the car sit?

Cusco lists a low-down setup of -30 mm front and -30 mm rear against stock, and a height adjustable range of -57 to 0 mm front and -52 to 0 mm rear. The final height depends on the car and the setup chosen, and an alignment is needed after any change, because camber and toe move with ride height.

Can the spring rates be changed?

Yes. The kit comes with 7 kg/mm front and 6 kg/mm rear springs, and Cusco lists optional rates of 6/8/9 kg/mm front and 5/7/8 kg/mm rear for this application. Stiffer springs suit a car on stickier tires; the standard rates suit most road and HPDE cars.

Can the dampers be rebuilt?

Yes. Cusco lists the Street Zero A Coilovers for FC3C as overhaulable, so the dampers can be serviced to restore their original damping rather than replaced. How often depends on use; a car that sees regular track days will need it sooner than a road car, and a rebuild is a good time to revalve if the setup has changed.

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Description

Cusco Street Zero A Coilovers for FC3C / FC3S Mazda RX-7

Cusco’s Street Zero A Coilovers for FC3C / FC3S Mazda RX-7 are Cusco’s Street Zero A line: twin-tube dampers of Cusco’s New Quiet design with 40 steps of damping adjustment, full-length adjustable bodies, and an optional eCON2 electronic controller. Springs are 7 kg/mm front and 6 kg/mm rear. Cusco rates the Street Zero A for street driving, autocross and HPDE, so it suits a car that is driven daily and taken to the occasional event. For a car that sees more track time, the Sport S or Sport R steps up to mono-tube dampers.

Design and Performance

A twin-tube damper keeps a large oil volume around the working cylinder, which helps ride comfort and keeps the damper quiet on broken roads. Because the bodies are threaded along their full length, ride height is set at the lower mount while spring preload and damper stroke stay where they were, so the kit can be lowered without giving up bump travel. Damping is set with a 40-step adjuster, or electronically with the optional eCON2 controller.

Features

40-step damping adjustment front and rear
Twin-tube dampers of Cusco’s New Quiet design
Full-length adjustable bodies for ride height
7 kg/mm front and 6 kg/mm rear springs
Upper mounts: pillowball, camber adjustable front, rubber, fixed rear

Specifications

Cusco part number: 420 61N CN
Series: Street Zero A
Damper type: Twin tube, New Quiet type
Damping adjustment, front: 40-Way Adjustable
Damping adjustment, rear: 40-Way Adjustable
Height adjustment: Full-length Adjustable
Spring rate, front: 7 kg/mm (approx. 392 lb/in)
Spring rate, rear: 6 kg/mm (approx. 336 lb/in)
Optional spring rates: front 6/8/9, rear 5/7/8 kg/mm
Height adjustable range: front -57 to 0 mm, rear -52 to 0 mm
Cusco low-down setup: -30 mm front, -30 mm rear
Upper mounts: pillowball, camber adjustable front, rubber, fixed rear
Overhaul: Serviceable by Cusco

Applications

Mazda RX-7: FC3C | 1986, 1986-1991
Mazda RX-7: FC3S | 1986, 1986-1991

Notes

A wheel alignment is needed after fitting the Street Zero A Coilovers for FC3C and after any ride height change

Frequently Asked Questions

Which cars do the Street Zero A Coilovers for FC3C fit? Cusco USA lists part number 420 61N CN for the Mazda RX-7 (FC3C, FC3S, 1986-1991). The Street Zero A Coilovers for FC3C kit comes with 7 kg/mm front and 6 kg/mm rear springs, so check the notes on this page for any model or year limits before ordering.
How is the damping adjusted? Each damper carries a 40-step adjuster. Turning it changes the damping force, so the car can be set softer for the road and firmer for the track. Start from the middle of the range. Make changes in small steps, one end of the car at a time, and note each setting so there is always a baseline to return to.
How much lower will the car sit? Cusco lists a low-down setup of -30 mm front and -30 mm rear against stock, and a height adjustable range of -57 to 0 mm front and -52 to 0 mm rear. The final height depends on the car and the setup chosen, and an alignment is needed after any change, because camber and toe move with ride height.
Can the spring rates be changed? Yes. The kit comes with 7 kg/mm front and 6 kg/mm rear springs, and Cusco lists optional rates of 6/8/9 kg/mm front and 5/7/8 kg/mm rear for this application. Stiffer springs suit a car on stickier tires; the standard rates suit most road and HPDE cars.
Can the dampers be rebuilt? Yes. Cusco lists the Street Zero A Coilovers for FC3C as overhaulable, so the dampers can be serviced to restore their original damping rather than replaced. How often depends on use; a car that sees regular track days will need it sooner than a road car, and a rebuild is a good time to revalve if the setup has changed.

About CUSCO

CUSCO is the brand of Carrosser Co., Ltd., founded in December 1977 and based in Takasaki, Gunma Prefecture, Japan. Carrosser designs and builds coilovers, limited-slip differentials, clutches, roll cages and chassis parts, sells its steel cages under the Safety 21 name, and competes in every All Japan Championship category from circuit racing to rally and gymkhana. CUSCO USA, a division of Carrosser, is based in Huntington Beach, California.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Cusco Street Zero A Coilovers for FC3C / FC3S Mazda RX-7 [420 61N CN]

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Cusco Street Zero A Coilovers for FC3C / FC3S Mazda RX-7

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

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