Searching for the perfect suspension upgrade for your 1990 Honda CRX Si-R? This guide is your one-stop resource! Whether you’re aiming to enhance performance, improve ride quality, or restore your classic’s handling, we cover the best options available. Unlock the full potential of your CRX Si-R and enjoy a smoother, sportier, and more comfortable driving experience.
1990 Honda CRX Si-R Suspension: Comprehensive Comparison Table
| Suspension Type | Application | Adjustability | Intended Use | Key Features | Approximate Price Range |
|---|---|---|---|---|---|
| OEM-style Shocks | Direct replacement | No | Daily driving | Comfort, factory ride height, low cost | $80 – $150/ea |
| Performance Shocks | Street/Track | Sometimes | Performance street | Enhanced damping, firmer handling | $85 – $120/ea |
| Coilover Kits | Street/Track | Yes (full) | Performance, racing | Height & damping adj., improved handling | $600 – $1500+/set |
| Air Suspension Kits | Custom/Show | Yes (height only) | Show, comfort | Adjustable ride height, plush ride | $1200 – $2500+/set |
| Lowering Springs | Direct replacement | No (fixed drop) | Street, mild sport | Lower stance, mild handling boost | $150 – $300/set |
| Camber Kits | Suspension tuning | Yes (camber only) | Alignment, handling | Prevents tire wear, camber correction | $75 – $170/pair |
| Bushing Upgrade Kits | Replacement part | N/A | Sport/daily | Firmer feel, longevity, sharper response | $50 – $150/set |
| Sway/Anti-roll Bars | Chassis tuning | N/A | Handle, reduce roll | Less body roll, flatter cornering | $120 – $350/kit |
Detailed Guide to 1990 Honda CRX Si-R Suspension
Compatibility: Understanding What Fits Your Si-R
The 1990 Honda CRX Si-R’s suspension is unique, especially compared to base or HF models. The Si-R features a double wishbone suspension with coil springs and gas-filled shocks at all four corners, complemented by anti-roll (sway) bars—front standard, rear on the Si-R. When choosing upgrades, you need to:
- Ensure any shocks, springs, or coilovers are confirmed for the 1988–1991 CRX Si-R (also commonly referred to as the ED9 chassis internationally).
- Be aware that not all CRX suspension parts are interchangeable between different trims or generations, especially with international vs. USDM models.
- Consider camber kits or alignment products when lowering, as the Si-R already sits lower and has different geometry from base models.
Tip: Check the intended years and trims for each product before purchasing. Most aftermarket parts list specific fitment tables—verify your exact model (Si-R, 1990) is supported.
Function: What Suspension Upgrades Actually Do
Suspension modifications change how your CRX Si-R handles road or track surfaces, affecting comfort, responsiveness, and tire contact with the pavement.
Key Suspension Functions:
- Controls Vehicle Movement: Absorbs road imperfections, maintains tire grip, and reduces body roll.
- Facilitates Alignment: Maintains proper geometry for optimal tire wear and safety.
- Adjusts Ride Height: Lowering stiffens and centers gravity for performance, while stock height favors comfort.
Key Upgrade Types & Effects:
- Performance Shocks (KYB AGX, KONI Sport): Improved damping and rebound control; some allow easy adjustments for daily or sporty use.
- Coilovers: Offer full adjustability of both ride height and damping, allowing fine-tuning for street or competitive use.
- Air Suspension: Lets you raise and lower your car for show or obstacles, with a focus on comfort and style.
- Bushings and Endlinks: Replace rubber bushings for firmer, more direct chassis response.
- Anti-roll/Sway Bars: Reduce body roll, sharpen handling, and correct understeer/oversteer tendencies.
Installation Tips: Getting the Most from Your Suspension Upgrade
Upgrading your CRX Si-R’s suspension can be straightforward with careful planning. Here’s how to approach it:
General Steps
- Preparation: Gather all parts (shocks, springs, coilovers, bushings, camber kits) and the correct tools (spring compressors, wrenches, jacks).
- Front & Rear Suspension Removal: Always support the car securely on stands before removing any components. The double wishbone design requires you to disconnect both upper and lower arms.
- Spring Caution: If reusing or replacing coil springs, use a spring compressor. Springs can eject with force—safety first.
- Bushing/Endlink Upgrades: Some may need to be pressed in/out; consider professional help if you lack a press.
- Alignment: Always get a professional alignment after any significant suspension change—lowering especially alters toe and camber.
- Camber Kits: Install if lowering more than 1 inch or if your camber is out of factory specified range, to prevent uneven tire wear.
Pro-Tip:
If installing coilovers or adjustable shocks, set your initial ride height close to stock. Adjust gradually while monitoring tire clearance and suspension travel. For air suspension, verify air line routing is safe from moving parts and heat.
Maintenance Advice: Keeping Your Si-R Suspension in Top Shape
Upgraded suspension requires regular checks and occasional maintenance:
- Inspect Fasteners: After 100–200 miles, recheck all bolts for tightness—they may settle after initial driving.
- Check Bushings: Upgraded polyurethane or pillowball bushings may squeak; lubricate annually or as needed.
- Shock/Coilover Health: Watch for leaking fluid or diminished ride quality, indicating a rebuild/replacement is needed.
- Air Suspension: Regularly check for compressor leaks and monitor air line condition.
- Alignment: Re-check at least once a year, or after any curb impact or height adjustment.
Best Practices for Choosing and Using 1990 Honda CRX Si-R Suspension
- Define Your Goal: Decide if you want comfort (daily driving), handling (performance/track), or customization (stance/show).
- Adjustability: Opt for externally adjustable shocks or coilovers if you want to fine-tune damping and ride height.
- Ride Height: Do not lower excessively unless necessary for motorsport; ride quality, practical clearance, and geometry can suffer.
- Spring Rates: Higher spring rates improve handling but can cause a harsh ride; balance your needs.
- Full Kits Over Piece-by-Piece: Purchasing matched kits (e.g., coilovers that include dampers and springs tuned together) reduces compatibility issues.
- Professional Alignment: Always follow up suspension work with a four-wheel alignment.
- Maintenance: Select well-known brands with serviceable parts or easy-to-find replacement bushings and seals.
- Consider Sway Bars: Upgrading just one (oftentimes the rear) can noticeably alter the Si-R’s handling balance.
Technical Comparison Table: 1990 Honda CRX Si-R Suspension Options
| Model/Type | Adjustability | Dampers | Lowering Range | Spring Rates | Intended Use | Price (Approx.) |
|---|---|---|---|---|---|---|
| OEM-style Shocks | None | Twin-tube | Stock only | Factory | Comfort, OE replacement | $80–$150/ea |
| KYB AGX Adjustable | 4–8 positions | Twin-tube, adj. | Stock only | OEM or upgr. spring | Sport, mild tuning | $85–$120/ea |
| KONI Sport Shocks | Yes (manual) | Twin-tube/Mono | Stock or mild | OEM/higher spring | Autocross, sport | $100–$130/ea |
| Performance Coilovers | Yes (full) | Monotube | 0–3″+ | Stiff; adjustable | Track, aggressive street | $600–$1500+/set |
| Air Suspension | Height adj. | Airbag+shock | 0–5″+ | Variable | Show, comfort | $1200–$2500+/set |
| Lowering Springs | No | N/A (spring only) | Usually -1″ | Fixed (stiffer) | Street look/performance | $150–$300/set |
| Camber Kit | Yes (camber) | N/A | N/A | N/A | Prevent tire wear | $75–$170/pair |
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Conclusion
Choosing the right suspension setup for your 1990 Honda CRX Si-R can completely transform the car’s handling, comfort, and appearance. Whether you’re looking to restore and refresh with new OEM-style components, seek better road feel and control with adjustable shocks, or want the ultimate in tuning and stance with coilovers or air suspension, the Si-R offers excellent upgrade potential.
Focus on well-matched components, consider your true needs (and local road conditions), and remember to invest in proper installation and alignment. Regular inspection and maintenance will ensure your investment continues to deliver both fun and safety for years to come.
FAQ
-
What’s the best suspension for daily driving my CRX Si-R?
For daily use, a set of high-quality OEM-style or slightly upgraded shocks with matched springs is ideal. They offer a good balance of comfort and handling without the stiffness or complexity of coilovers. -
How much can I safely lower my 1990 CRX Si-R?
Lowering up to 1–1.5 inches is typically safe for street use, provided you use quality springs or coilovers and retain full suspension travel. Excessive lowering can negatively affect geometry, comfort, and tire wear. -
Do I need a camber kit if I lower my car?
Yes, if you lower your CRX Si-R by more than an inch, a camber kit is highly recommended. It helps maintain proper tire wear and alignment settings. -
Are coilovers difficult to install?
Most coilovers are bolt-in replacements for the factory setup; basic mechanical skill and tools are required. Spring compressors may be necessary for removal of factory springs. An alignment is needed after installation. -
What’s the difference between monotube and twin-tube shocks?
Monotube shocks offer better heat dissipation and more consistent damping—ideal for aggressive driving and track use. Twin-tubes are generally softer and tuned more for comfort. -
Can I use track-oriented coilovers on the street?
You can, but track coilovers often have high spring rates and stiff damping, resulting in a much firmer, less comfortable ride for daily driving. -
What are signs my suspension needs replacing?
Symptoms include bouncy or harsh ride, leaking oil from shocks, uneven tire wear, excessive body roll, or clunking noises over bumps. -
How often should I check or service my suspension?
Inspect suspension after any hard use or about every 12,000–15,000 miles. Performance setups (coilovers, air suspension) may require more frequent checks. -
Will aftermarket suspension affect my insurance or legal compliance?
In some areas, significant modifications (especially extreme lowering or air suspension) can impact insurance or road legality. Check local laws and your policy. -
Can I mix and match different suspension parts (e.g., springs from one brand, shocks from another)?
While possible, it’s best to use kits designed to work together. Incorrectly matched components can cause poor ride quality, premature wear, or handling issues.
This guide equips you with all the information necessary to confidently select, install, and maintain the optimal suspension setup for your 1990 Honda CRX Si-R, ensuring enhanced handling, safety, and driving enjoyment.