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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 10-24-2012, 04:37 PM
TXFred TXFred is offline
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FSD's, ride height and alignment.

I'm planning a Koni FSD install, and wanted to get a few things straight in my head before I started the work.

I've ridden and modified motorcycles for many years, and am very skilled mechanically. However, I'm still new to cars, so chassis geometry and suspension is not something I know a lot about. So I have some questions.

1. Do the FSDs provide any way to adjust ride height? I'm not looking to lower the car, just adjust it to factory specifications. Possibly, I'd even raise it just a bit to get some more clearance on speed bumps.

2. Does the car need to be aligned after I replace the struts, assuming no other changes are made?

3. Does the car need to be aligned after I adjust the ride height?

Cheers,
Frederic
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Old 10-24-2012, 05:33 PM
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captainaudio captainaudio is offline
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The FSDs are a replacement for the OEM shocks and do not have an adjustment for ride height. After I had them installed I did not need to have an alignment.

CA
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  #3  
Old 10-24-2012, 06:05 PM
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CALWATERBOY CALWATERBOY is offline
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Mein Auto: 2009 E93 N54
Quote:
Originally Posted by TXFred View Post
1. Do the FSDs provide any way to adjust ride height? I'm not looking to lower the car, just adjust it to factory specifications. Possibly, I'd even raise it just a bit to get some more clearance on speed bumps.

2. Does the car need to be aligned after I replace the struts, assuming no other changes are made?

3. Does the car need to be aligned after I adjust the ride height?

1) No
2) Recommended
3) Yes!

I wouldn't raise the height. Skosh lower maybe, but there's no stock adj. Stock alignment: Front & Rear Toe; Rear Camber. Zero thrust angle. Optional: BMW recommended weights.

Here's what I did - might assist.

.

Last edited by CALWATERBOY; 10-24-2012 at 06:10 PM.
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Old 10-24-2012, 06:11 PM
ramblinman ramblinman is offline
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I always get an alignment after changing struts. Theoretically, a new strut shouldn't change the alignment if it's an oem spec replacement, but any good mechanic will tell you to at least have the alignment checked. For the price of bmw replacement tires, it's cheap insurance. I just had FSD's installed a few months ago and the shop included an alignment with their estimate, even though the subbed out they work and made no money on it.

Last edited by ramblinman; 10-24-2012 at 06:12 PM.
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Old 10-24-2012, 08:21 PM
TXFred TXFred is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Here's what I did - might assist.

.
Good link. Thanks!

Since I'm just swapping struts, I assume I won't have to do as much work as you did. Reading your post, it's hard to tell what is part of the strut replacement, and what is being done so you can add /M components.

I've done shock replacement before (Nissan pickup) but not struts. With shocks, I just jack the car, remove the wheel, unbolt the shock, then install the new one. With the struts, is it the same other than the need to use a spring compressor?

Frederic
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Old 10-24-2012, 09:34 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by TXFred View Post
Since I'm just swapping struts, I assume I won't have to do as much work as you did. Reading your post, it's hard to tell what is part of the strut replacement, and what is being done so you can add /M components.

I've done shock replacement before (Nissan pickup) but not struts. With shocks, I just jack the car, remove the wheel, unbolt the shock, then install the new one. With the struts, is it the same other than the need to use a spring compressor?
More or less, assuming your coilovers [struts] come pre-assembled. Def need spring compressors to get stock out; progressive springs in. If linear springs, may have enough clearance not to need compressors.

When doing it, my gibberish will make sense. Get a couple o'3/8 female x 1/4" male adaptors - they're cheap but easily self destruct. Or a real spreader tool....

Front's easy and struts are a quick job. Rear's a bit more trouble. Correct torque important on BMW's!

.

Last edited by CALWATERBOY; 10-24-2012 at 09:38 PM.
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Old 11-13-2012, 08:25 PM
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ModBargains.com ModBargains.com is offline
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1. Do the FSDs provide any way to adjust ride height? I'm not looking to lower the car, just adjust it to factory specifications. Possibly, I'd even raise it just a bit to get some more clearance on speed bumps.
The KONI FSD shocks are an OEM replacement. You can reuse your factory springs or aftermarket lowering springs with them. You do not have the ability to adjust the height and that is something that you would get with a coilover system.

2. Does the car need to be aligned after I replace the struts, assuming no other changes are made?
Yes, an alignment is recommended when replacing the shocks.

3. Does the car need to be aligned after I adjust the ride height?
Replacing the shocks does not affect the height of the car. If you have coilovers and adjust the height, then an alignment would be recommended.
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