All BC Racing Coilovers have seperate ride height adjustability. Meaning that when the ride height is adjusted, it is completely independent from any other adjustment made. Many coilovers adjust the height of the vehicle through spring load. This is highly undesired since for one, you have a very limited adjustment in height. Another reason this is undesired is because as you lower the car, the spring preload is increased which will make for a much harsher ride. The springs will have less travel and will not be able to operate correctly. Vice versa, if you wanted to raise the car, the spring rate would lessen and can get to the point where you hurt the shocks to allow premature shock failure. BC Racing has built their coilovers to adjust the height using the strut mounting in the lower bracket. To lower the coilovers, you must ensure the upper locking rings are tight, loosen the lower locking ring, and adjust the whole coilover. Afterwards, it is very important that each part is correctly tightened. This article will show you how to properly adjust your height to reduce any chances of incorrect installation. Adjustment is made using the supplied spanner wrenches with each kit. There are 2 larger locking rings, and one smaller ring that correspond to the smaller and larger spanner wrench. All rotations are referenced viewing from the bottom of the coilover.

This whole article is under the assumption that you are capable of removing all wheels and tires safely on a properly supported vehicle. If you are uncomfortable with any of these procedures, please take your car to a professional. We are not responsible for any mishaps and this article is simply to be used as a guideline.

Note: This article covers the standard spring over strut coilover and does not cover kits with the spring seperate from the strut.

Step 1. Ensure Top Locking Rings are Tight

When adjusting the height of the coilover, it is best to use the upper locking rings as leverage to rotate the assembly. The main reason for this is to prevent damaging the threads of the shock cartidge, and it is easiest from this location to gain enough force if sometimes the cartidge assembly is hard to rotate. It is recommended to spray a lubricant on the threads to assist in lowering friction and easier adjustment (WD40, PB Blaster, etc.) Since these upper rings will be used for adjustment, they must be locked tight together to prevent rotation of one while rotating the other. To do so, use the larger spanner wrench on the lower spring seat, and the smaller spanner wrench on the upper lock ring. Rotate the lower spring seat counter clockwise, and the upper lock ring clockwise. This will tighten each ring towards each other and prevent unwanted adjustment.

                                                                                                     Step 1

Step 2. Loosening Lower Lock Ring

BC Racing uses a concave locking ring for the lower section to further prevent any height adjustment changes. This lower ring concave matches a concave finish on the lower mounting bracket to sit flush to. This provides more surface area for friction to apply and keeps this ring locked in place. Loosening this ring is imperative to adjust ride height. Simply rotate this ring clockwise to loosen the lower mount and allow for adjustment.

One thing to note on this lower locking ring, is it is a good way to measure how much adjustment you have done when lowering or raising the vehicle. More info on this is available in the next step when adjusting the height.


                                                                                            Step 2


Step 3. Adjusting the Height

This is the main event. Using the upper lock ring, and lower spring seat, rotate the shock cartridge whichever way you would like to adjust your height. If lowering the vehicle is where you want to go, use the larger spanner wrench and rotate the lower spring seat counter clockwise. This will lower the shock cartridge into the lower mount and effectively lower the height of the vehicle. If raising the vehicle is where you want to go, use the smaller spanner wrench and rotate the upper lock ring clockwise. This will raise the coilover out of the lower mount and effectively raise the vehicle.

                                        Step 3 Lower                              Step 3 Raise

The above mentioned lower lock ring provides a great way to generally measure how much the coilover has been adjusted. To keep track of how much the coilover has been lowered, loosen the lower lock ring and adjust it until the gap between the lower lock ring and upper lock ring accounts for however much you want to lower the vehicle. For example, if you wanted to lower the vehicle 1-inch and measured a 4-inch gap between the two rings, you would raise the lower lock ring until there is a 3-inch gap them. Rotate the shock cartridge counter-clockwise until the lower lock ring is snug on the top of the lower mount. 

To keep track of how much the coilover has been raised, loosen the lower lock ring for it to rotate freely but keep it close to the mount. Measure the distance between the lower lock ring and the bottom of the upper lock ring. Rotate the coilover clockwise to raise it and keep measuring the distance between the lower lock ring and the bottom of the upper lock ring until desired height is acheived. For example if you wish to raise the car 1-inch and measured a 3-inch gap between rings, you would leave the lower lock ring loosened and in place above the lower mount, then rotate the coilover until there is a 4-inch gap between the lower lock ring and the bottom of the upper lock ring.

The alternative to measuring each gap with a measuring tape or similar tool, would be counting threads. This is a less accurate method since it is harder to accurately count the threads for each corner.



Step 4. Repeat All Four Corners

Repeat steps 1-3 for all corners. It is best to do each corner sperately and measure the gap that is changed at each corner. This step will take time and patience to do correctly and may need to be adjusted multiple times. For this, it is highly recommended to have a lift available to adjust all 4 corners at the same time, place wheels back on, and lower the vehicle to measure. Measurements are commonly done from either fender to center of the wheel, or fender to the ground. If a lift is not available, it is suggested to do either front or rear at the same time. This means adjusting both fronts until you get them where you want, then move to the rear and adjust those to same specs or vice versa. To save on time, when placing the wheels back on, placing a minimum of 3 lug nuts on the wheels hand tight is managable since they are going to come back off for adjustment anyways. This allows you to place the wheels on and lower the vehicle to measure the adjustment without having to put it all back on and waste time. Do not drive or rotate the wheels without all your lug nuts on and torqued down.

Step 5. Tighten All Components

When finished and all adjustments are where you want them to be, make sure to tighten all lock rings to prevent adjustment changes. Since the upper rings have already been tightened against each other, the lower ring is the only one to make sure is tight. Using the larger spanner wrench, rotate the lower lock ring counter clockwise until snug against the lower mount. Repeat this for all 4 corners. Place your wheels back on and tighten all lug nuts to torque spec and lower the vehicle. You are now finished and are able to properly adjust the height on your coilovers!

                                                                                                          Step 5