If you are new to the blog and haven’t read Part 1, I recommend you check it out here.
I have put a lot of love into this story so I hope that you enjoy taking the time to read this!
Let me start off by saying that I have found the source to my issue and I am very happy to share it with everyone who is currently having trouble with their coilovers. You may have purchased them from a third-party seller, may have bought them from eBay, or purchased off of a forum – either way, you can never be too careful. I was lucky enough to purchase my Tein Street Basis Z coilovers on a reseller that sold the coilovers with the top-hats included for an amazing price. Almost $200 off the retail price, as it was on sale.
In the back of my mind, I thought it was to good to be true but I want to give it a try. They came in the original Tein box with no dents on the packaging. Unfortunately, this was one of my very few purchases of mods to my car and didn’t know much about them. I’m here to warn those who were willing to research before purchasing (or installing).
Issue: Ride was bouncy – felt like I was imitating a basketball. Normally bumps felt smooth – it’s the bouncing after the bump that makes the ride irritating. Even on smooth roads, I feel every little bounce and it dampens as I speed up.
Fix: In order to fix your bounce, the top perch must be secure and non-flimsy. This requires the following tools:
– Spanner Wrench (1): Only one is needed to the hold the top perch from moving or spinning while adjusting
– 21mm 1/2 inch deep Socket: this is needed to tighten the top-center shaft nut for the 2013-2016 FR-S (Socket size may vary for different car models)
– Optional: Torque wrench: There isn’t a specific torque that was provided for specification; however, I have estimated about 41 ft/lb torque to be used for the top-center shaft nut (refer to image below).
Jack up the car and remove the front wheels. Once the wheels are removed, open the hood of your car to begin the process of tightening the top perch of the coilover.
While holding the top perch with the Spanner Wrench, use a ratchet or torque wrench to tighten the top-center shaft nut. Once torqued, you will feel resistance. Tighten to snug, do not over-torque.
Repeat the same process to the passenger side coilovers to ensure balance. Once complete, replace wheels back onto the car and allow the car a couple of minutes for the coilovers to set. Give a test drive and feel the difference of how smooth it is compared to the bounce it had before. Trust me, this relieved so much stress in my life. However, the process was very fun to figure out.
Once complete, your top perch should look similar to this:
Your bouncy issues should be fixed! Please be aware that normal bumps will be felt due to the works of the coilover and spring (a good thing) and shouldn’t have an excessive bounce after contact. If you have any questions or concerns, please feel free to contact me and I will help/answer any questions you may have.
Disclaimer: I am not liable for any damage or injuries caused with the modification of your car. This post was made from personal experience and should be read as a guidance and not professional work. I AM NOT A PROFESSIONAL. I complete work on my own car and I understand the risks. I undergo a lot of research and spoke with Tein customer service for confirmation.