Are you looking to enhance the handling and performance of your 7th generation Honda Civic (EM2/ES1)? A popular modification among enthusiasts involves utilizing suspension components from the Honda Rsx (also known as the Acura RSX or Honda Integra DC5) or the European Civic Type R (EP3). While not a direct bolt-on swap, installing Honda RSX suspension parts onto your 7th gen Civic is achievable with some modifications. This guide will clarify what’s involved in fitting RSX suspension and what you need to know to ensure a successful upgrade.
Honda RSX/EP3 Suspension on 7th Gen Civic: Compatibility Explained
The short answer is yes, Honda RSX and EP3 suspension can fit your 7th gen Civic, but it’s not a straightforward process. The compatibility largely depends on the specific RSX/EP3 parts you intend to use and the year of your Civic. Early EP3 components are generally more compatible, while later models introduced changes, particularly in strut bolt sizes and tie rod ends, that necessitate modifications.
To simplify the process, let’s break down the compatibility based on different suspension setups and components:
1. Full Coilover Systems with Upper Mounts/Camber Plates
If you’re opting for a complete coilover system for your 7th gen Civic and the kit includes front upper mounts or camber plates, the installation becomes relatively simpler. In this scenario, the primary component you’ll need to address for compatibility is the DC5/EP3 tie rod ends. Swapping to these tie rod ends is generally necessary to ensure proper fitment and alignment with the RSX suspension setup.
Regarding the rear strut bolts, there may be variability. Some users have reported encountering larger rear strut bolts on RSX/EP3 components compared to the 7th gen Civic. It’s advisable to check the bolt sizes and be prepared for potential minor adjustments if necessary.
2. Full Coilover Systems without Upper Mounts/Camber Plates
For coilover systems that do not include front upper mounts, you’ll need to reuse the upper mounts from your stock 7th gen Civic suspension. Similar to the previous scenario, DC5/EP3 tie rod ends are required. Crucially, it is generally not recommended to use DC5/EP3 upper mounts on a 7th gen Civic. Sticking with your original Civic upper mounts ensures proper geometry and fitment.
3. Progressive Springs: Not Recommended
While progressive springs designed for the Honda RSX technically might physically fit on a 7th gen Civic strut, this is strongly discouraged. Progressive springs are engineered with specific vehicle weight distributions in mind. The weight distribution of an RSX differs from a 7th gen Civic. Using RSX progressive springs on your Civic can lead to suboptimal suspension performance and an unusual ride height or stance.
4. RSX/EP3 Shocks with Stock Components
If you intend to use just the shocks from a Honda RSX or EP3, this is feasible. The key is to retain your 7th gen Civic’s upper mounts and, again, utilize new DC5/EP3 tie rod ends. This combination allows for the installation of RSX/EP3 shocks while maintaining compatibility with your Civic’s chassis and steering system.
5. 2001-2002 EM2/ES1 Civic Models: Potential Strut Mount Hole Drilling
Owners of 2001-2002 (early) 7th gen Civics (EM2/ES1) might encounter an additional hurdle. These earlier models sometimes have smaller (14mm) strut mount holes compared to later models and the RSX/EP3 (16mm). In such cases, drilling out your strut mount holes to 16mm might seem like an option. However, this is not an easy job and is generally not recommended for DIYers due to safety and precision concerns.
Furthermore, it is also not recommended to use your original 14mm bolts in 16mm holes. This creates a risk of “camber sliding,” where the strut can shift within the larger hole, leading to unstable alignment and potentially dangerous handling.
6. Miscellaneous DC5/EP3 Parts: Varying Compatibility
Beyond core suspension components, you might be curious about the compatibility of other RSX/EP3 chassis and bracing parts. Here’s a breakdown:
- Front Strut Bars: Some RSX/EP3 front strut bars may fit the 7th gen Civic, but compatibility is not guaranteed and may require trial and error.
- Rear Sway Bars: All Honda RSX/EP3 rear sway bars are generally compatible and will fit the 7th gen Civic. This is a popular and effective upgrade.
- Front Sway Bars: Similar to front strut bars, some RSX/EP3 front sway bars may fit, but it’s not a universal fit.
- Rear Lower Tie Bars: All RSX/EP3 rear lower tie bars are compatible with the 7th gen Civic.
- Trunk Tie Bars: All RSX/EP3 trunk tie bars will fit the 7th gen Civic sedan models.
- Hatch Tie Bars: Hatch-specific tie bars from the RSX/EP3 will not fit the 7th gen Civic sedan, as the 7th gen Civic does not have a hatchback body style.
Conclusion: Is the Honda RSX Suspension Swap Worth It?
Upgrading your 7th gen Civic suspension with Honda RSX or EP3 components can offer a noticeable improvement in handling and potentially open up a wider range of aftermarket suspension options. However, it’s crucial to understand that this is not a direct swap and requires careful attention to detail and specific modifications, primarily concerning tie rod ends and potentially strut bolt sizes.
If you are comfortable with basic automotive modifications and are looking for a performance upgrade, utilizing Honda RSX suspension parts can be a viable path. Always ensure you are using the correct components, especially tie rod ends, and consider consulting with a professional mechanic if you are unsure about any aspect of the installation process. This will help ensure a safe and effective upgrade to your Honda Civic’s suspension system.
