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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Main advantages of coilovers



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      03-15-2008, 12:06 PM   #1
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Main advantages of coilovers

What are the main advantages I can expect from having coilovers installed on my 330XI?
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      03-15-2008, 12:16 PM   #2
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Corner Balance ?
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      03-15-2008, 12:36 PM   #3
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adjustability. ride height can be dialed in. better ride then just lowering springs. on some better units the rebound and compression setting can be adjusted.
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      03-15-2008, 12:37 PM   #4
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but they are usually pricey
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      03-21-2008, 04:09 PM   #5
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Outside of the ability to adjust height and combinations of none to full shock rebound and compression, the biggest benefit is that the shock is designed to work perfectly with the spring regardless of the ride height set.

Coilovers don't suffer from the possible problems of mixing of spring rates, shock travels, etc like you could run into with getting springs and shocks from different sources aka... lowering springs on stock shocks.
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      03-25-2008, 02:39 AM   #6
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Some coilovers work much better than others
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      03-25-2008, 05:43 PM   #7
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You really have to consider whether the benefits of height and in some cases dampening/compression adjustability are worth the extra cost to you. For most customers who want a spirited everyday driver, a spring/shock combo would be more than adequate.

With that said, if you are after dialing in your own ride height and stiffness settings, then coils are definitely the way to go.
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      03-28-2008, 11:19 PM   #8
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I have the oppurtunity to purchase a used set of KW2 coil-overs for a decent price. I want to only lower my car 1/2" or so beyond the factory sport suspension (I have a 330i with the sport suspension).
Is it possible to only lower the car 1/2"?
How will the installation of the coil-overs affect the ride characteristics? I really love the ride/handling balance of the car right now, plus my wife enjoys the way the car drives now.

I am a true automotive enthusiast and love to push my car through the corners (going fast straight is a bit boring to me). Would these be right for me?
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      04-24-2008, 04:35 PM   #9
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according to the KW website F/R lowering (mix-max) is

F 1.2-2.3
R 0.9-2.1

i assume these are based on the non sport suspension... so if the sport suspension is .5" lower then non sport... 1.2" total would be another .7 down up front...

i am probably going to be getting these coils soon - and will most likely run them near the "min" lowering - i want to retain as much suspension travel as possible while improving the handling - although i wouldn't mind a slight drop...
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      04-25-2008, 01:26 AM   #10
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Quote:
Originally Posted by AW325xi View Post
I have the oppurtunity to purchase a used set of KW2 coil-overs for a decent price. I want to only lower my car 1/2" or so beyond the factory sport suspension (I have a 330i with the sport suspension).
Is it possible to only lower the car 1/2"?
How will the installation of the coil-overs affect the ride characteristics? I really love the ride/handling balance of the car right now, plus my wife enjoys the way the car drives now.

I am a true automotive enthusiast and love to push my car through the corners (going fast straight is a bit boring to me). Would these be right for me?
Make sure to get the right kit for your car part # 35220048 for XI models

The drop range for your model car is Front 0.6-1.8" Rear 0.6-1.6" so that puts you where you want to be

KWs are great, they will treat you very well
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      04-25-2008, 10:42 AM   #11
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Stock suspension is "coilovers". Shocks and springs work well together. Some aftermarket coilovers are adjustable. For example you can adjust height. However, e.g. KW is not height adjustable from the body (it is not threaded), but only from the spring seats. So that is not the best way to lower your car.

When it comes to adjusting bound and rebound, you should ask yourself is there something you want to adjust. And to which direction And by how much.

It is impossible to say if some coilovers are better than the stock ones if you don't know if you want to adjust bound or rebound and if yes, in what way you want to adjust them.
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      04-25-2008, 10:11 PM   #12
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I actually have a 330i, my wife has the 325xi now.

I just picked up a set of JIC Cross Coil-Overs along with adjustable UUC sway bars. I'll get back on this board once I get everything installed.

I'm going to try to do two track day events this year. I can't wait
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      04-26-2008, 03:12 AM   #13
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Quote:
Originally Posted by Lane View Post
Stock suspension is "coilovers". Shocks and springs work well together. Some aftermarket coilovers are adjustable. For example you can adjust height. However, e.g. KW is not height adjustable from the body (it is not threaded), but only from the spring seats. So that is not the best way to lower your car.

When it comes to adjusting bound and rebound, you should ask yourself is there something you want to adjust. And to which direction And by how much.

It is impossible to say if some coilovers are better than the stock ones if you don't know if you want to adjust bound or rebound and if yes, in what way you want to adjust them.


The body of the front damper is threaded with KW but not the rear. That is not the design of KW but BMW. When the springs & damper is connected then the shock body can be threaded. From the factory for the 3-series, the springs are separate from the damper in the rear.

My sentences needs to be organized, I'm so confused, I'm confusing myself
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      04-30-2008, 07:53 PM   #14
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Sam is correct. I wish the stock suspension was a coilover system.

Right now our shocks have a perch with the spring compressed over and and upper mount sandwiches the spring between the perch top mount. The comprises a stock suspension setup.

A coilover has a shock which is threaded which the perch sits on, this threading allows the perch to be moved upwards or downwards thus the spring height can be adjusted.

Coilovers benefits are corner balancing, a matched shock and spring rate, dampening adjustment and height adjustment.

I'd only get coilovers for track and go with a match spring and shock set up for street.
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      05-01-2008, 03:46 AM   #15
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Coilovers perform very well on the street if they are good coilovers. Not all coilovers are built equally. Shock Valving for rebound plus compression & spring rates play HUGE factor in performance & comfort.
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      05-01-2008, 09:17 AM   #16
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one -

There are no CO that let me keep the stock sport ride height
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      05-01-2008, 10:36 AM   #17
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      05-02-2008, 12:46 PM   #18
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Quote:
Originally Posted by Magna3 View Post
one -

There are no CO that let me keep the stock sport ride height
Yes, that is amazing. Many brands that are well acknowledged compromize the ground clearance even in the highest settings. I cannot buy those because I would not get in all the places I need to visit occasionally.
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      05-22-2008, 09:18 PM   #19
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Quote:
Originally Posted by Magna3 View Post
one -

There are no CO that let me keep the stock sport ride height
We installed a set of ST which is the same as KW V1 on a coupe & it sat right at stock sport height.
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      05-22-2008, 09:57 PM   #20
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I have KW V3 installed in my xi and one word "WOW". The handling is definity improved. Cornering has improved dramatically with less body roll. I feel the road more at low speeds but it is not uncomfortable. At higher speeds this car is definitely smoother and easier to handle. Definitely go with the coilover especially the KWV3. Just my opinion.
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      05-22-2008, 10:05 PM   #21
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Quote:
Originally Posted by ChuckBimmer View Post
I have KW V3 installed in my xi and one word "WOW". The handling is definity improved. Cornering has improved dramatically with less body roll. I feel the road more at low speeds but it is not uncomfortable. At higher speeds this car is definitely smoother and easier to handle. Definitely go with the coilover especially the KWV3. Just my opinion.
KWV3s are amazzzing!!! and im slammed!!!
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      05-22-2008, 10:13 PM   #22
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Because I already waited almost 4 weeks for my KW V3. And seems like it won't be available for at least another 3 weeks due to production issues.
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