Hey everyone. This had been brought to our attention a few months back from two consumers having ride height issues with the S.Tech lowering springs on their 2004 Mazda RX-8 (SE3P chassis) 2006 Mazda Miata MX-5 (NCEC chassis). This ride height claim had become puzzling to us as we had encountered this type of issue which was a quick an easy fix by preloading the suspension but for some reason this did not seem to work.

Baffled, we requested the customer send the lowering springs to us for further inspection to determine if the springs had any manufacturing defects and to our surprise they were within spec. Looking to further find a solution to this issue we decided to bring a car in for testing to determine the cause. This is where it became a little more interesting, as we were able to physically do the installation rather than reference the consumers photos and measurements. We proceeded with the spring install following the bump rubber cut and all to find that we too were having the same issue even when preloading the suspension.

Concerned, we had to confirm all of the suspension bushings and components conditions which all were found in excellent condition. At that moment a light bulb lit up and someone had an idea. The bushings on the control arms. (when the control arm is pivoted) had an extremely short amount of give/ movement. With this in mind we tried preloading those bushings, as well as those which the dampers bolt on during the second install. Once the vehicle had been placed back on the ground the ride height corrects were immediate. The vehicle ride height was within the kits values without any further complications with ride height and with excellent ride quality feel.

 Both images shown above and below would illustrate a Red circle drawn on the bushings detailed in the post.

Now this was an issue found on these two particular models but has not occurred with any other manufacturer. Please keep in mind that these vehicles did use the OEM shock absorbers. The use of any aftermarket type shock absorbers may also effect the ride height values as we had only done testing on the stock shocks absorbers. Please be cautious with the selection should the new dampers be required.

I do hope this post helps any consumers out their who may have encountered this situation with the aforementioned vehicles. Always remember that should you have any further concerns with these applications utilizing our lowering springs or any of our other product lines, please don’t hesitate to drop us a line. Also for further details on the process of suspension preloading, please revisit the  TEIN Blog post “Applying Suspension Preload” for a breakdown of how to do.
http://teinusa-blog.com/applying-suspension-preload/