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rear Strong-Strut installation instructions
Please read instructions completely before installing the rear Strong-Strut
Installation of the rear Strong-Strut is quite simple and involves the removal of two large nuts that fasten the rear axle carrier to the car, positioning the rear Strong-Strut in place and attaching the spacing hardware and custom fasteners (nuts)
Once your car is SAFELY on a hoist or jackstands, it should be no more than a 30 minute process. Most of our customers are installing it without raising the car at all. It works, but there is a bit less room to work.
We have included an enhanced parts diagram from BMW and a hand drawn illustration to assist you in the installation. Please familiarize yourself with these documents before starting the installation
There are colored pictures of the installed prototype rear Strong-Strut on the web page athttp://www.strong-strut.com
Viewing the pictures will be an installation aid.
The variation in available engines in the Z3 result in several different exhaust system configurations, component size, and component location. The rear Strong-Strut is a universal fit for all models. The only clearance issues are for either the exhaust system or for the quilted aluminum heat shielding nearby. In addition to the 2 inch square spacer, we provide a round,¼ inch thick and two thinner washers. These can be used singly or in combination at the owners discretion to provide more or less clearance where necessary. If the rear Strong-Strut touches any of the aluminum heat shielding, it’s best to modify the shield by tapping or bending it slightly out of harms way. It is important that you use the ½ inch thick round spacer and the ¼ inch thick round spacer in every installation. Use of both will insure that the shank of the custom fastener will not bottom out on the mounting bracket but leave the rear Strong-Strut itself, lose. You have the option of inserting both the spacers wherever they result in the best installation for your car…….but both MUST BE USED. Providing there are no clearance issues with the exhaust routing, we suggest mounting the round ¼ inch spacer above the rear Strong-Strut and then place the ½ inch thick square spacer below the rear Strong-Strut under the head of the fastener. This provides the most ground clearance for the rear Strong-Strut. This arrangement may not be possible on all cars but try this method first. The two thin washers can be used at the owners discretion to gain additional exhaust pipe clearance if needed.
22 mm deep socket (7/8 inch) or open end/ box wrench to remove OEM nuts on axle carrier.
1 and 1/8 inch socket and torque wrench to attach custom fasteners.
NEVER get under a vehicle that is supported only by a jack. If the jack were to fail for any reason, you could be crushed to death. Do not utilize any of the movable rear suspension components for jacking up the car or for jackstand placement. Use the provided jacking pads in the rocker panel and place your jackstands or other supports in a safe and appropriate location.
The rear Strong-Strut was made to fit all models of the Z3 in stock configuration. If you have a custom exhaust or other modifications in the vicinity of the rear Strong-Strut, there may be conflicts in clearances. Often in these situations, the application of a little imagination, common sense, and addition of some extra washers, is all that is needed to correct the issue.
Be especially kind to the threaded studs (on diagram, #2 thread bolt) If they get damaged to the point of replacement, it will require removal of the inner fender liner for access.
IMPORTANT After 300 miles of operation, re-torque the custom fasteners to 75 – 80 ft pounds. Thereafter, we suggest you check them at each oil change.
A WORD ABOUT THE DESIGN AND LOCATION
The rear Strong-Strut is bolted below the sub frame rear axle carrier. Everything above the OEM mounting brackets of the sub frame is mounted in rubber anti-vibration mounts and is designed to move around. Therefore, the rear axle carrier, although massive in appearance, provides no stiffing element to the body/chassis. Because the rear Strong-Strut is bolted below, and directly to the mounting brackets, which are in turn solidly bolted to the body, the rear Strong-Strut serves as a rigid transverse reinforcing member. This ties both sides of the body/chassis together just forward of the rear wheels and resists the torquing/twisting forces of the rear body structure when subjected to aggressive cornering or uneven roadway. By eliminating or reducing body flex, the rear of the car follows the front more crisply when turning into corners. One experienced driver remarked that it feels like rear wheel steering has been added to the car. The obvious benefit is the disappearance of the "lose" feeling in the rear that all Z3 Roadsters seem to have, and a more unified feel to the structure when subjected to bumpy or uneven road surfaces. The Strong-Strut rear Strong-Strut functions much the same way as the front Strong-Strut, in that it prevents sheet metal structures from reacting to twisting and torquing forces.
If you encounter difficulties with the installation, please do not hesitate to contact firstname.lastname@example.org
480 513 3222
Thank you for your purchase of the Strong-Strut rear Strong-Strut, we know you will get many years of enjoyment from its benefits.
Please visit our web site and review our other products.http://www.Strong-Strut.com. Many find that out factory matching spray paint kit is quite handy.
Paul and the Strong-Strut Team