The BMW E30 and E36 chassis, while both iconic in their own right, present distinct design philosophies. One intriguing modification for E36 enthusiasts involves swapping the compact trailing arms from an E30 onto their E36 chassis. This isn't a straightforward bolt-on affair, but understanding the intricacies can lead to a rewarding upgrade for those seeking specific handling characteristics. This article delves into the reasons behind this modification, the challenges involved, and the potential benefits and drawbacks.
Why Swap E30 Compact Trailing Arms onto an E36?
The primary motivation for this swap centers around altering the E36's handling characteristics. E36 rear suspensions, while capable, are often criticized for their tendency towards oversteer, particularly at higher speeds or under aggressive driving. E30 compact trailing arms, with their simpler design and different geometry, are believed by some to offer a more predictable and neutral handling balance. This perceived improvement in handling is the driving force behind this modification.
What are the Challenges of this Swap?
This isn't a simple "plug and play" modification. Several significant challenges must be overcome:
- Fabrication: The E30 and E36 chassis are different, requiring significant fabrication work to adapt the E30 trailing arms to the E36. This usually involves custom mounting points and potentially modifications to the subframe.
- Brakes: The brake setup will likely need to be modified to accommodate the different geometry of the E30 trailing arms.
- Axle: The axles will almost certainly need to be changed or significantly modified to work with the new setup.
- Exhaust: The exhaust system will likely require adjustments due to the changed rear suspension geometry.
- Expertise: This is not a beginner-level project. Significant mechanical skills, welding experience, and access to fabrication tools are necessary.
What are the benefits of using E30 Compact Trailing Arms on an E36?
The purported benefits, driving the desire for this swap, include:
- Improved Handling Balance: Many enthusiasts report a more neutral and predictable handling feel with less oversteer.
- Reduced Oversteer: The modified geometry aims to reduce the E36's inherent tendency towards oversteer.
- Improved Turn-in: Some find the turn-in response to be sharper and more direct.
What are the drawbacks of using E30 Compact Trailing Arms on an E36?
It's crucial to acknowledge the potential downsides:
- Increased Complexity: The project requires significant fabrication and mechanical expertise.
- Cost: The cost of parts, fabrication, and potential alignment adjustments can be substantial.
- Ride Quality: Some report a slightly firmer, less compliant ride.
- Reduced Comfort: The modified geometry might compromise ride comfort, especially on rough roads.
Are E30 Trailing Arms Stronger than E36 Trailing Arms?
The strength of the E30 versus E36 trailing arms is a topic of debate among enthusiasts. While the E30 arms are generally considered more robust due to their simpler design and materials, the ultimate strength depends on several factors, including the condition of the specific arms and how they are mounted.
Are E30 Trailing Arms Better than E36 Trailing Arms?
There's no definitive answer to whether E30 trailing arms are "better" than E36 trailing arms. It's subjective and depends on individual preferences and driving styles. The E30 arms offer a different handling feel that some prefer, but it comes at the cost of increased complexity and potential drawbacks.
Conclusion
Swapping E30 compact trailing arms onto an E36 is a significant undertaking requiring considerable mechanical skill and fabrication expertise. While the potential for improved handling balance and reduced oversteer is a strong motivator, potential drawbacks regarding cost, complexity, and ride quality must be carefully considered. This modification is not for the faint of heart and should only be attempted by experienced mechanics with the necessary tools and knowledge. Ultimately, the decision to pursue this swap hinges on a deep understanding of the challenges and a clear understanding of the desired handling characteristics.
