Just finished my install of Eibach Pro-Kit springs on my Coupe. I did it one tire at a time. Torque spec on tire lugnuts: 80ft/lb. The following is a post copied from Gsedan35 over in FreshAlloy. He installed springs and struts from a 350Z. I only installed Eibach springs on my Coupe. It is edited to be specific to the coupe. “I did this to help anyone wanting to do this themselves. If any moderator would like to edit this in anyway to improve it and place it in the FAQ section, to right ahead. This is how “I” did it. You can do your own thing where it makes sense to do so.
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These arm will allow you to fine tune your alignment settings for minimizing tire wear, or for maximum track performance. These arms completely replace your existing upper control arms.
Step 1: Raise the entire front of the car and secure it with jack stands. Never work under a car supported only by a hydraulic floor jack. Check your owner’s manual for proper placement of floor jacks and jack stands. If you live in an area where rust is a concern liberal use of penetrating fluid will be necessary and may increase the installation difficult. If you have any concerns, please consult with a professional.
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FRONT INSTALLTION INSTRUCTIONS
1. Block the rear wheels of the vehicle. Raise the front of the vehicle and support the vehicle with jack stands under the frame rails. Remove the front wheels and tires and set aside. Position a hydraulic jack under the front axle and raise the jack until the front suspension begins to compress.
2. On both sides of the vehicle, scribe alignment marks on the adjustment cam and axle bracket at the lower link to axle attachment point for later reference. See Photo 1
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Removal Procedure
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle General Information.
2. Disconnect the electrical connector and air line if equipped with Real Time Damping (RTD) .
3. Support the rear axle.
4. Disconnect the RTD sensor ( if equipped). Refer to Rear Position Sensor Replacement -
Electronic Suspension – Left (15 Series) or Rear Position Sensor Replacement -
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