Say Goodbye to Tossing and Turning with the E91 Series Magic Bed

The E91 series magic bed is a groundbreaking innovation in the world of sleep technology. This bed is equipped with a wide range of adjustable options that provide users with the ultimate level of comfort and support. One of the main features of the E91 series magic bed is its adjustable firmness. Users can easily adjust the firmness of the bed to their preferred level, ensuring that they have a personalized sleeping surface that caters to their unique needs. Whether they prefer a soft, plush feel or a firm, supportive one, the E91 series magic bed can accommodate their preferences. Another notable feature of the E91 series magic bed is its adjustable incline.

Sounds like maybe the B6 would be the middle ground, help the spring deal with the extra momentum and just deal with the slight sag.

BMW actually refers to them as auxiliary springs ; their job is not just acting as a bump stop at full compression, but also to give a progressive spring rate when the suspension is compressed. I did coil overs, and even with my ride height starting out 25-30mm lower, I can put 400 lbs worth of stuff in the back and it still rides higher than it did with the stock springs.

Another notable feature of the E91 series magic bed is its adjustable incline. This option allows users to elevate the head or foot of the bed to the desired position, providing various health benefits. Elevating the head can help alleviate snoring, acid reflux, and sleep apnea, while elevating the foot can promote better blood circulation and reduce swelling in the legs.

E91 series magic bed with adjustable options

Currently running a stock suspension rebuilt about 30k ago (completely, arms/bushings, mounts, etc, only thing left was the spring)

Running the Bilstein B4 OE replacement ones. Its fine for daily but with COVID doing a lot more camping and bikes and gets a little bouncy when the car is fully loaded. Add onto that and the girlfriend wants a motorcycle too so probably going to be running a dual rail trailer, adding a total of 400lbs to the current 760lb rig. Plus it would be nice even for raceday because those days on top of the bike being towed I have the car loaded with tools, paddock stand, pop-ups, coolers, genny, etc. So it rides about an inch low.

Im wondering if just bumping to the B6 in the rear is going to make that much of a difference:
https://www.bimmerworld.com/Suspensi. 24-120395.html

Is there a stiffer but stock ride height spring to add? I cant really lower it because Im often going down gravel roads/tracks to get to cabins and campsites. I dont want stance nation ride but I could give up a little cush in the back now that Im no longer commuting.

frankly I think the spring rate in the rear is simply too low.

I did coil overs, and even with my ride height starting out 25-30mm lower, I can put 400 lbs worth of stuff in the back and it still rides higher than it did with the stock springs.

changing just the shock is not going to change your weight capacity, that's solely a function of the rear spring rate.

Something else to look at might be Arnott air shocks. I use them on my full size SUV and very happy with them. Guessing you might carry a compressor or air tank with you for track days, so that is a way you could control ride height.

Dang. So thinking the stiffer shock wouldnt even affect bounce that much? Its not bad, just over bad roads (of which we have a few in the south). Im not hitting the bump stops or rubbing.

Im OK with the ride height if Im stuck with it, at least OK enough to not do air shocks (thanks for the suggestion BTW).

If your problem is bouncing, then stiffer shocks should do what you want. However they may then be a bit harsh when unloaded.

The e91 has stiffer springs in the back than other e9x models, because it's intended to be loaded up with stuff then driven.

If you can find your current spring codes, I can tell you approximately the rate you've got, and probably recommend a replacement OE spring which will give the result you're looking for (based on calculated rates from aftermarket/OEM spring catalog data).

Honestly, I think you may have best results looking for an adjustable rear shock for it, so you can set it softer when running empty, and firm for running fully laden.

Also, is it a sport or non-sport ('SE') model?

SE. FX16687. I'll have to pull the wheel to find the spring code but I can say the car is pretty standard e91.

I thought your complaint was the sagged ride height, not so much bouncy.
I never thought mine was bouncy even when overloaded.

are you sure it isn't bouncy because you're hitting the bump stops on compression?

put some witness marks.paper/tape on the bumps, load it up and go drive. see if you're getting into them.
if so, you need stiffer springs.
if not, then perhaps shocks are your answer to control the spring.

Ive checked the stops a couple of times and they dont have any signs of wear despite a lot of miles towing like shown above. More just a slight bounce making the rig less stable on crappy bridges and whatnot.

Id like to get rid of some of the sag but its not enough that Id think I need to go air shocks. I dont scrape or see any signs of bottoming out. More of a nice to have (im really anal).

Sounds like maybe the B6 would be the middle ground, help the spring deal with the extra momentum and just deal with the slight sag.

SE. FX16687. I'll have to pull the wheel to find the spring code but I can say the car is pretty standard e91.

I'll assume the rear springs are the same as mine then; F3. F4 is the same spring. They're somewhere in the region of 543.5lb/in. The equivalent sport spring is a K4 at 593lb/in, and corresponding 5/8" lower static ride height. There is also a K5 which is intended for cars with sport suspension and a tow bar, at 615lb/in and the same static ride height as the K4. F5 would have been the factory fit spring for your car, if it had been specced with a tow bar, but my calcs have it as only 548lb/in (1% stiffer). Free length is the same.

An F6 spring exists 'for vehicles with increased payload'; 593lb/in, 328mm free length. results in the same as your current ride height (+/- a few mm), but 10% stiffer. I think this is the spring you should look for, if you keep it OE. but it might be rare. There are likely others which would work out about right, but they would have larger comprimise when unladen.

With uprating your springs even slightly, the chances are you'll want to pair them with a stiffer shock too; the B6 should be a decent match for the F6 spring, comparing the F6 rate with the K4/K5 rates. However, would that be an e91 specific B6? The equivalent spec of car, but e90, would use a C4 spring. with 445lb/in rate!

Regarding the bump stops. BMW actually refers to them as 'auxiliary springs'; their job is not just acting as a bump stop at full compression, but also to give a progressive spring rate when the suspension is compressed. Give or take 5mm of wheel travel, these aux springs will be engaged under 'normal' loading (2 front passengers, 1 rear passenger, 21kg in the trunk). So it is guaranteed that you'll be riding on them when your car is laden. but that's not necessarily an issue! By the looks of it though, you are running pretty deep into your travel, which may mean that you're in the bump stop portion of the aux spring, and therefore the effective rear spring rate is pretty extreme (so any shock will struggle to control it). Swapping to a sport bump stop is unlikely to help this significantly, because the car will just sit proportionately lower and you'll have the same issue still.

So, F6 springs or similar, uprated shocks (to suit the e91, uprated springs, and increased payload), and you should be set. Good luck figuring the shocks out. maybe ask FCM?

Something else to look at might be Arnott air shocks. I use them on my full size SUV and very happy with them. Guessing you might carry a compressor or air tank with you for track days, so that is a way you could control ride height.

The E91 series magic bed also comes with adjustable massage options. Users can enjoy the soothing and therapeutic benefits of a massage right in the comfort of their own bed. With multiple massage modes and intensities to choose from, they can customize their massage experience to relax their muscles and relieve tension. Furthermore, the E91 series magic bed features adjustable lighting and temperature control. Users can effortlessly set the mood with soft, ambient lighting and adjust the bed's temperature to their liking. This creates a tranquil and inviting atmosphere that enhances the overall sleep experience. In summary, the E91 series magic bed is an incredible sleep technology innovation. With its adjustable options for firmness, incline, massage, lighting, and temperature control, users can create their own personalized sleep environment. This bed is designed to cater to individual preferences and provide the ultimate level of comfort and relaxation. The E91 series magic bed truly redefines the way we sleep..

Reviews for "Upgrade Your Sleeping Experience with the E91 Series Magic Bed"

1. John - 1 star - This bed was a complete waste of my money. The adjustable options were difficult to operate and the remote control was glitchy. It would often get stuck and wouldn't respond to my commands. The mattress was also extremely uncomfortable and gave me terrible back pain. I regret purchasing this bed and would not recommend it to anyone.

2. Lisa - 2 stars - I was disappointed with the E91 series magic bed. The adjustable options were limited and not as customizable as I had expected. The bed frame itself also felt flimsy and cheaply made. The mattress was too firm for my liking and I found it to be uncomfortable. Overall, I was not satisfied with the quality and performance of this bed and would not purchase it again.

3. Michael - 2 stars - The E91 series magic bed did not live up to my expectations. The adjustable options were difficult to understand and operate, and I often struggled to find the right position. The mattress was also lacking in comfort and support, causing me to have restless nights. Considering the high price I paid for this bed, I was disappointed with its performance and would not recommend it to others.

Experience the Future of Sleep with the E91 Series Magic Bed