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If you’re an auto enthusiast who values performance and comfort in equal measure, the choice of a transmission mount can significantly impact your driving experience. Having recently experimented with the Z1 Polyurethane Transmission Mount, I decided to revisit my OEM roots. Here’s a deep dive into my journey, questions, and insights on finding the right transmission mount.
The Polyurethane Experience
After five years with the Z1 Polyurethane Transmission Mount, I began to reconsider its suitability for my needs. The Z1 transmission mount, while enhancing drivetrain solidity and improving shifting, also introduced a noticeable increase in Noise, Vibration, and Harshness (NVH). This isn’t inherently bad – some drivers enjoy the visceral connection it provides. Installation was straightforward, taking about an hour and costing $200. Despite the benefits, I found myself longing for a bit more comfort.
The immediate appeal of the Z1 transmission mount was its promise of improved shifting precision and a more connected driving experience. By reducing the flex and movement of the transmission, the Z1 mount provided a more direct feel, which was particularly noticeable during aggressive driving or spirited runs through twisty roads. The mount’s polyurethane construction offered a firmer base compared to the softer, fluid-filled OEM mount, translating to a more responsive drivetrain.
However, this increased responsiveness came at a cost. The NVH levels were significantly higher with the Z1 mount. On long drives, the constant vibration and noise became fatiguing. The car’s cabin, which once felt insulated and refined, now reverberated with the hum and buzz of the transmission. Initially, this raw and unfiltered connection to the car’s mechanical workings felt exhilarating, but over time, it started to detract from the overall driving enjoyment.
Returning to OEM
The original transmission mount, which I stashed in the attic, seemed like a logical step back towards a smoother ride. Considering the age and potential wear, I opted for a fresh start with a new OEM transmission mount. Here’s where the journey got interesting.
Questions Arise:
1. Compatibility: Is the same part used for both manual (6MT) and automatic transmissions?
2. Part Numbers: Struggling to pinpoint the exact part number on various Infiniti parts websites left me frustrated.
Sharing my findings, I discovered discrepancies in part numbers: Z1 lists the part as 11320-1EA0A, while other sites list it as 11320-EG800. Both numbers seem interchangeable, but the difference sparked curiosity about their specifications.
The quest for the correct part number involved scouring multiple forums and parts websites. Despite the variations in part numbers, the general consensus was that the mounts were largely interchangeable between the manual and automatic transmissions, but verifying this with absolute certainty was crucial. The frustration of navigating parts websites and cross-referencing different models underscored the importance of accurate information when dealing with vehicle components.
OEM vs. Z1 Polyurethane
Switching back to the OEM mount transformed my car into a luxurious ride. Surprisingly, it felt faster, likely due to the reduction in vibrations affecting the knock sensors. The car’s timing improved, eliminating the sluggish response I had unknowingly endured.
The reinstallation process was straightforward. With the car securely lifted and supported, the old Z1 mount was removed, and the new OEM mount was bolted into place. The difference was immediate and profound. The return to OEM brought back the smooth, refined feel that the car originally had. The cabin was quieter, and the harsh vibrations that had become a daily annoyance were gone.
Interestingly, the car felt more responsive as well. The reduction in NVH seemed to positively impact the car’s performance, possibly by allowing the engine and transmission to operate more harmoniously without the interference of excessive vibrations. This unexpected benefit highlighted how interconnected vehicle components are and how a single modification can have cascading effects on overall performance.
Community Insights
A significant part of this exploration involved insights from fellow enthusiasts. Here’s what stood out:
– Material Experimentation: Some suggested filling the OEM mount with a softer polyurethane for a custom solution. While intriguing, it required more creative effort than I could muster.
– NVH Trade-offs: Many shared my sentiment that the NVH introduced by the Z1 mount wasn’t worth the trade-off. Poly mounts, while offering firmer support, came with increased cabin noise and vibration.
– Engine vs. Transmission Mounts: Poly engine mounts were often recommended over transmission mounts due to their ability to improve drivetrain geometry with less NVH.
The community’s collective wisdom was invaluable. Many had experimented with different mounts and shared their experiences. The idea of modifying the OEM mount with a softer polyurethane filling was an innovative approach, offering a potential middle ground between the firmness of the Z1 mount and the comfort of the OEM mount. However, the practical challenges of such a DIY project made it less appealing for someone without extensive fabrication skills.
Discussions about NVH trade-offs were particularly insightful. It became clear that while some enthusiasts were willing to endure higher NVH for the sake of performance, others, like myself, preferred a more balanced approach. The consensus was that poly engine mounts offered a better compromise, providing improved drivetrain stability without significantly increasing NVH. This distinction underscored the importance of considering the specific role and placement of mounts within the vehicle.
Final Thoughts
After swapping back to the OEM mount, I felt a significant improvement in comfort and performance. The process was quick, taking about 30 minutes. While at it, I also tackled some preventative maintenance – a coolant system flush, thermostat replacement, and gasket check.
Reflecting on this journey, I’ve learned that while aftermarket options like the Z1 Polyurethane Transmission Mount offer specific advantages, they might not be suitable for everyone. For those who prioritize a balance of performance and comfort, an OEM transmission mount is a worthy choice.
The return to OEM marked the end of a chapter filled with experimentation and discovery. The smoother, quieter ride reaffirmed my decision to prioritize comfort and refinement. The car once again felt like a well-rounded machine, capable of delivering both performance and luxury.
As I continue to refine my car’s setup, I’ll keep exploring modifications that offer the best of both worlds. For now, I’m content with the quiet, smooth ride the OEM mount provides. This experience has reinforced the value of thoughtful, balanced modifications that enhance the driving experience without compromising on essential comforts. Whether you’re a performance enthusiast or a daily driver, finding the right balance in your car’s setup is key to long-term satisfaction.
