Coilover Install & Review: BMW 335xi AWD. Get Low

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Things to add to the review in the video:

While the front suspension on the E90 rear wheel drive (RWD) and all wheel drive (AWD) are not interchangeable this diy should be relevant to both. The RWD will not run into the travel issues as easily when lowered with aftermarket springs, so it is much more of a viable option. The AWD suspension will bottom out on the bump stops much easier if it is lowered with these and bang very violently over potholes etc. Without getting too technical coilovers solve this issue by effectively making the shock shorter while the spring/travel stay the same vs making only the spring shorter which reduces overall travel.

An alignment will be necessary when the car is lowered or raised, a passable one can be achieved by making sure the screws on the front shocks are repositioned where the factory shocks are removed from. another issue to watch out for while lowering is putting undue stress on the front control arm bushings. loosening them completely while suspension is loaded and at ride height then retightening will take the strain off of the bushings making sure they are not pre-torqued.

The front coilovers should have the preload on the spring set from factory. Simply move the shock body up and down in the threaded tube to raise and lower.

The rear is a bit harder since it’s not a traditional coilover. The springs and shock height are adjusted independently. The only way I could get the shocks adjusted correctly was by feel. Make them the same length as the stock shocks to start with and perhaps lower them a bit from there. At first the rear was overly stiff because they were way out of their adjustment range how they came shipped. I thought I had spent a lot of money on absolutely ruining the cars feel, so it’s important to give yourself some time to dial this in.

As far as absolute drop on on the back with the supplied spacers vs no spacers: if you would like to keep the rear at stock height, a little higher, or lowered about 1-1.5 inches put the spacers in. If you will never want the rear any higher then lowered 1-1.5″ from stock leave the spacers out. The drop shown is with the rear fully raised without spacers but with all of the threads engaged.

To adjust the rebound and compression damping turn the adjusters completely counter clockwise the count the clicks back up. A good place to start is somewhere between 12-14 front and 8-10 on the back. I tried going full soft and everything seemed to ride a bit worse, you could tell it was way underdampened for the springs and the whole car got very floaty without being much more comfortable. I was hoping I would have more adjustment between comfort and sporty, but it seemed to only feel right with the spring rates in a relatively narrow adjustment. I found myself just leaving it around there. You can control the over vs understeer with the split between the two but only to a point.

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