[bbog2008]

I am on Dinan springs and B8's. I travel through a road construction area every day and of course it is a very rough ride. But you need to think about this - this combo is stiffer that the stock suspension. BMW provided a pressure value for the tires based on their suspension. To get rid of the roughness and to avoid further damages you need to dial down the tires' pressure to where you feel the ride is smooth again on rough roads. I did it and I can tell you that I cannot feel the pot holes and the bumps anymore, and also there is no body roll.

[325MBKK]

Old thread, but the same part got busted when I hit a pothole with 20" wheels. I am on Bilstein's as well and drove home for around 3-4 miles. Made a funny 'clack clack' sound but couldn't damage it any further so I thought what the hell and just took the risk and drove it back home.

[Polo08816]

Originally Posted by bbog2008

I am on Dinan springs and B8's. I travel through a road construction area every day and of course it is a very rough ride. But you need to think about this - this combo is stiffer that the stock suspension. BMW provided a pressure value for the tires based on their suspension. To get rid of the roughness and to avoid further damages you need to dial down the tires' pressure to where you feel the ride is smooth again on rough roads. I did it and I can tell you that I cannot feel the pot holes and the bumps anymore, and also there is no body roll.

...so what tire pressures are you running?

Why would this be an issue with the H&R +Bilstein setup but not the M Performance Suspension?

[bbog2008]

[QUOTE=Polo08816;18272282]...so what tire pressures are you running?

I am 4 psi below sticker, front and rear.

[Polo08816]

Originally Posted by bbog2008

I am 4 psi below sticker, front and rear.

So basically, you're 4psi below the minimum recommended pressure.

Aren't you concerned that you could eventually have a blowout due to under-inflation?

http://www.tirerack.com/tires/tirete...e.jsp?techid=1

[bbog2008]

Originally Posted by Polo08816

So basically, you're 4psi below the minimum recommended pressure.

Aren't you concerned that you could eventually have a blowout due to under-inflation?

http://www.tirerack.com/tires/tirete...e.jsp?techid=1

Not necessarily. I have got to this pressures after testing at different pressures. Right now the car is very responsive, without body roll, corners very precise and the ride is not harsh. And the cabin is not rattling. I can feel it just a tad soft but still very compliant. This set up is working for me and the road quality in my area. Fuel consumption did not go up at all, and tire ware ... well I will have to gauge it in time and make my decision - tires or car integrity and ride quality.

If I were to take a long drive I would still add at least 2 psi.

But again, this is based on my experiencing.

PS - Let's not forget that the sticker on E9X was showing a rage of pressures for both front and rear, if I am remembering this correctly my 325i was to be set up from 29 to 32 front and 35 to 39 rear. And the suspension on that car was stiffer that any F30 today. I am very close to that right now.

[Shazsta]

Still going strong after I replaced my broken one. Probably a combination of being aware of the issue and the b8's softening up.

[Darekme]

Originally Posted by Shazsta

and the b8's softening up.

Do you mean that you have changed softness of B8? Some local bilstein representative actually offers adjustment services too. Did it help? Did you notice significantly less knocks of the shocks than before?

[Shazsta]

No I just mean over time they've gotten softer than how they were out the box. It's a good thing too.

[Darekme]

My service looked at my suspension again more carefully and the conclusion was that these springs do not match with bisltein B8. They are too short (fronts). When mounted they are not compressed at all. Adding to that fact that B8 is pretty stiff we have all body weight being carried by shock absorber, not by spring. I replaced HR springs by eibach pro-kit and the car is fantastic now. I have them for over 4 weeks and shock never compressed to its end hitting hard. And Im concentrating now back on driving, not on searching of holes in the road. I did also one track day and car behaves much better than on H&R. On that setup the car is not as low as used to be on HR but I find is actually as advantage for daily usage.

[bbog2008]

Originally Posted by Darekme

My service looked at my suspension again more carefully and the conclusion was that these springs do not match with bisltein B8. They are too short (fronts). When mounted they are not compressed at all. Adding to that fact that B8 is pretty stiff we have all body weight being carried by shock absorber, not by spring. I replaced HR springs by eibach pro-kit and the car is fantastic now. I have them for over 4 weeks and shock never compressed to its end hitting hard. And Im concentrating now back on driving, not on searching of holes in the road. I did also one track day and car behaves much better than on H&R. On that setup the car is not as low as used to be on HR but I find is actually as advantage for daily usage.

Do you have a picture with your car stance on previous setup?

[overkill1125]

Originally Posted by Darekme

My service looked at my suspension again more carefully and the conclusion was that these springs do not match with bisltein B8. They are too short (fronts). When mounted they are not compressed at all. Adding to that fact that B8 is pretty stiff we have all body weight being carried by shock absorber, not by spring. I replaced HR springs by eibach pro-kit and the car is fantastic now. I have them for over 4 weeks and shock never compressed to its end hitting hard. And Im concentrating now back on driving, not on searching of holes in the road. I did also one track day and car behaves much better than on H&R. On that setup the car is not as low as used to be on HR but I find is actually as advantage for daily usage.

Wondering if it's the same issue for xdrive? I know eibach doesn't have any springs made specifically for the xdrive?
I do know that the rears are the same for RWD and AWD but its the front that is different.

[LastFrontierBimmer]

Originally Posted by Darekme

My service looked at my suspension again more carefully and the conclusion was that these springs do not match with bisltein B8. They are too short (fronts). When mounted they are not compressed at all. Adding to that fact that B8 is pretty stiff we have all body weight being carried by shock absorber, not by spring. I replaced HR springs by eibach pro-kit and the car is fantastic now. I have them for over 4 weeks and shock never compressed to its end hitting hard. And Im concentrating now back on driving, not on searching of holes in the road. I did also one track day and car behaves much better than on H&R. On that setup the car is not as low as used to be on HR but I find is actually as advantage for daily usage.

This sounds very plausible. My ride was $hI7 with H&R Sports over Bilstein B8s. Well, it was quite nice on a perfect road, but introduce the slightest duress in the form of a choppy, bumpy roads and it "slammed" and lost composure. I gave up on the H&Rs and just swapped them for DINAN springs on my '14 F32 435i xDrive. Night and day. The ride is now firm, almost stiff, but with a suppleness over rolling bumps and excellent composure over choppy, crappy roads. Mind you, I've got 1 1/2 to 2 fingers of clearance in the front and 1 1/2 fingers rear, i.e., it rides higher than the H&Rs, which were almost tucked into the front fender and 1 1/2 fingers clearance in the rear. While it's higher than it was on the H&Rs, it's still considerably lower than stock xDrive and looks great. I'll take the renewed ride of the DINAN springs/Bilstein B8s any day. It's the balance of sporty performance and drivability I was looking for when I first began making changes to the stock xDrive suspension. Very pleased after 4 days of driving.

[Eat.Sleep.Race]

Just upgrade to some adjustable camber plates.

[LastFrontierBimmer]

Originally Posted by Eat.Sleep.Race

Just upgrade to some adjustable camber plates.

Do you know of any good ones that work with stock suspension, or in my case, DINAN springs with Bilstein B8s (which I am told is same as stock when considering camber plates)?

[Darekme]

Originally Posted by bbog2008

Do you have a picture with your car stance on previous setup?

In order:

Eibach + bilstein B8 przod_resize.jpg (125.4 KB)
Eibach + bilstein B8 tyl_resize.jpg (156.3 KB)
HR + Bilstein B8 przod_resize.jpg (137.7 KB)
HR + Bilstein B8 tyl_resize.jpg (136.7 KB)
OEM przod_resize.jpg (134.4 KB)
OEM tył_resize.jpg (108.7 KB)

"Przod" means front, "Tyl" is rear.

[Darekme]

Originally Posted by overkill1125

Wondering if it's the same issue for xdrive? I know eibach doesn't have any springs made specifically for the xdrive?
I do know that the rears are the same for RWD and AWD but its the front that is different.

My car is xdrive. Ebiach has springs dedicated for xdirve. In my case (335ix) the part number is E10-20-031-06-22. In Europe they are half price of H&R. Eibach has different springs for 2 and 3 litre engines because their weight makes big difference.

[Polo08816]

Originally Posted by Shazsta

i ordered the part. apparently it is a revised part number and bmws says replace it in pairs. maybe its not so weak now?

What's the part number?

[Shazsta]

78704401d I think

[Shazsta]

Actually that's not it. That's what was on a sticker that was on it but I don't remember the part. Looks the same though.

[Polo08816]

My service looked at my suspension again more carefully and the conclusion was that these springs do not match with bisltein B8. They are too short (fronts). When mounted they are not compressed at all. Adding to that fact that B8 is pretty stiff we have all body weight being carried by shock absorber, not by spring.

Sounds like the driveway mechanics completely fail boated on piecing together suspension components.

[CPWINCH]

similar thing happened to me but mine happened from turning in too early and hitting the apex hard at the track. I ordered adjustable tc kline camber plates to fix the issue instead of replacing with oem