How to Lower Coilovers - Performance DIY by DIY Guru

Performance DIY by DIY Guru

Performance Diy is an automotive blog covering diy jobs from simple repairs,modifications to full restomod/restorations.If its on wheels its on Performance Diy

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If you have a lower priced version (like JIC SF1's) then you should raise the springs as high as possible and then the proper way to adjust is to lower them. The reason for this is if you raise the car by the springs (how mine was done) then you will compress and pre-load them (wrong).

Rings are aluminum and spanner wrenches are steel, hence wrenches do not scratch. You can however scratch the rings if adjusted incorrectly.

1. figure out the height of your springs (mine are approximately 7 & 7/8th")
2. If springs were touched then you need to expand them. It's easy to tell, there should not be scratches on the metal rings from raising under pressure. You can unlock the bottom ring then loosen the top ring to lower the spring until it's loose. The tighten slightly. I tightened my springs to 7.75" height. This keeps them tought but no preload.
3. The coil over is adjusted by raising/lowering the threaded pipe (not springs). Unlock the steel purch (bottom part of damper that threaded pipe goes in to) by loosening the third/bottom ring and raise it up. You will adjust by turning the two locked rings under the spring (top one). Since there is no preload, it should turn very easily and you won't scratch the rings.
Tip: You can double stack the wrenches which gives you more torque to adjust height.
4. I adjusted mine to a total of 10" on the passenger side and 10.25" on the driver side. I weigh 200lbs and there is a 1/4" drop with me in the car. It will give you a floor to fender lip height of 26" which is perfect for street use (25" for track). Mine was previously adjusted to 24.5" which is way too low (yes, 1/2" was enough diff' to scrape speed bumps). You will want to measure from the top of the spring (under pillowball mount) to the top of the female perch.
Note: Different brands may have different measurements. Mine are Buddy Club Racing Spec but these are good numbers for you to start with..
5. Expect it to take some time if doing it by yourself as you will most likely need to adjust every corner several times. Make sure you lock the rings and torque the lug nuts properly.
Tip: You can determine your weight drop yourself with a measuring tape (metal retractable) and a business card. Open the door and measure from the floor to the X on the scuff plates. Then sit in it and measure again. Use a business card sticking outward to line up with the tape. Pinch the tape where the business card touches and read measurements. Make sure you measured at the same point the second time. This isn't as good as corner weight but pretty damn good for free and doing it yourself.

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