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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Question: Springs vs Coils



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      10-19-2011, 07:04 PM   #1
pimp4cheddar
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Question: Springs vs Coils

Dear suspension experts.

I have an E92 in which I'm looking to drop fairly soon.

My car has a set of 19's on it which I love...but it has the stock BMW Sports Package Suspension.


I've seen the way my car would look with just H&R Springs and I actually like it. I think I'll be happy with springs and 19's rather than spending a ton of cash on coilovers.


The problem I'm having is I don't want the car to ride and feel bouncy. I want a nice stiff suspension.


I've read that the only different between springs and coilovers are the actual drop - but they both ride the same. Is this true?

I know springs will wear out the struts faster if they are swapped for Koni's. But I'm concerned about the drive.


Any advice folks?
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      10-19-2011, 08:07 PM   #2
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Go with coils! worth spending the money now and having a good set-up, you will find yourself asking the same question in 12-24mths when your shocks are shot.

Below is NOT the case, coils allow much more adjustment than height in comparison to springs ie, compression rebound. And since you can afford a BMW you should be able to afford coils

"I've read that the only different between springs and coilovers are the actual drop - but they both ride the same. Is this true?"

As you are able to adjust compression and rebound (on good systems Independently) on coils you will be able to customize how your ride reacts overall.
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      10-19-2011, 08:09 PM   #3
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Coils..I would suggest Koni yellows paired w swifts springs..will give u MUCH better handling and still maintain a civil ride on the street

www.hpashop.com
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      10-19-2011, 08:26 PM   #4
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Quote:
Originally Posted by 2jzbmw View Post
Go with coils! worth spending the money now and having a good set-up, you will find yourself asking the same question in 12-24mths when your shocks are shot.

Below is NOT the case, coils allow much more adjustment than height in comparison to springs ie, compression rebound. And since you can afford a BMW you should be able to afford coils

"I've read that the only different between springs and coilovers are the actual drop - but they both ride the same. Is this true?"

As you are able to adjust compression and rebound (on good systems Independently) on coils you will be able to customize how your ride reacts overall.

I appreciate the feedback.

The issue is I'm not planning on tracking my car EVER!!! + suspension isn't all that important to me. My car doesn't look that bad at all with the ZSP and 19's. I just want a little more drop - I will probably never adjust it once it's set.


I've thought about the fact that if I go with springs I'll have to change the shocks in a year - so I'll end up spending over $900+. If that's the case - then I might as well do coilovers to begin with.


I'm thinking about doing the ST Coilovers since KW makes them. They're about $850 which isn't too bad and it'll be cheaper than springs and koni shocks!


I'm still looking for reviews on the ST Coilovers. I see a few for Sonic Tuning - but I'd like to stay away from those as they have some pretty negative reviews.
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      10-19-2011, 08:51 PM   #5
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if you dont want bouncy, you're cheapest alternative to full coilover sets, is to get springs and matching shocks/struts. if you get only springs and dump them on stock shocks, you WILL be bouncing everywhere. trust. lol
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      10-19-2011, 08:59 PM   #6
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Quote:
Originally Posted by pimp4cheddar View Post
I appreciate the feedback.

The issue is I'm not planning on tracking my car EVER!!! + suspension isn't all that important to me. My car doesn't look that bad at all with the ZSP and 19's. I just want a little more drop - I will probably never adjust it once it's set.


I've thought about the fact that if I go with springs I'll have to change the shocks in a year - so I'll end up spending over $900+. If that's the case - then I might as well do coilovers to begin with.


I'm thinking about doing the ST Coilovers since KW makes them. They're about $850 which isn't too bad and it'll be cheaper than springs and koni shocks!


I'm still looking for reviews on the ST Coilovers. I see a few for Sonic Tuning - but I'd like to stay away from those as they have some pretty negative reviews.
KW dampers are great its their progressive rate springs that are not..so many I know who develop noise and issues with it..u really cant go wrong with swifts.

Good suspension options are not cheap..I would almost stay stock than cut corners w a budget setup
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      10-19-2011, 09:10 PM   #7
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first of all, springs don't make the car bouncy if they are paired with the correct damper. Coilovers will match the springs with a new damper, so you get both with height adjustability. A good set of shocks/struts like koni yellows will pair up with just about any lowering spring and allow you to adjust the rebound stiffness to match those springs (and not be bouncy).

The issue is doing it right the first time. If you get springs - get some new shocks to go with it. Coilovers will cost more, but they also give you height adjustment
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      10-19-2011, 09:29 PM   #8
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Quote:
Originally Posted by pimp4cheddar View Post
I appreciate the feedback.

The issue is I'm not planning on tracking my car EVER!!! + suspension isn't all that important to me. My car doesn't look that bad at all with the ZSP and 19's. I just want a little more drop - I will probably never adjust it once it's set.


I've thought about the fact that if I go with springs I'll have to change the shocks in a year - so I'll end up spending over $900+. If that's the case - then I might as well do coilovers to begin with.


I'm thinking about doing the ST Coilovers since KW makes them. They're about $850 which isn't too bad and it'll be cheaper than springs and koni shocks!


I'm still looking for reviews on the ST Coilovers. I see a few for Sonic Tuning - but I'd like to stay away from those as they have some pretty negative reviews.
Check out KW Street Comfort coilovers; linear rate springs and matching dampers; minimal to mederate lowering. Send Alan at **********s a pm for pricing; you can get them for less than what's listed on their website.
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      10-19-2011, 10:14 PM   #9
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Paring up an aftermarket spring with more aggressive spring rates will definitely cause your OEM non-sport or sport shocks to wear out over time. This is due to the fact that OEM shocks are simply not meant to handle the more aggressive spring rates. Think of it this way, you're putting a shorter spring with a longer shock body. The shorter springs will cause the shocks to compress to its maximum setting every time you hit a bump due to the longer travel distance. What this can cause is what's known as bump steer and jarring of the ride. This is what for the most part affects ride quality.

Let's break this down in terms of cost. You'll spend about $230-300 bucks for aftermarket springs, another $250-300 for an installation, and another $65-$125 for an alignment. When your OEM sport or non-sport shocks blow your going to have to spend another $700-800 on shocks, another installation fee, and another alignment. If you calculate that all together, you would saved a whole lot more money doing it right and going with an aftermarket spring paired up with an aftermarket shock.

With that being said, would you be willing to explore the option of possibly going with a coilover system? The answer is simple; you get what you pay for when it comes to vehicle suspension. As such a crucial component of your vehicle, suspension is definitely something you do not want to cheap out on. A coilover suspension basically gives you a matched lowering spring and shock absorber combination with the added benefit of adjustable ride height and spring rates through a moveable spring perch or perches. Coilovers are to your car's advantage by reducing unsprung mass, increasing suspension travel, and allowing the car to be corner balanced. As some have already mentioned, KW does have some great coilover setups for you to choose from!!
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      11-01-2011, 06:15 AM   #10
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You basically want a matched lowering spring and shock absorber combination with without spending the money for coilovers... look up Eibach Pro System. It comes with their springs and matched dampers. Think of if as a non-adjustable coilover that's pro tuned if you will. Even though you don't track, they're track approved. Good luck with your search. Oh yeah, I'm sure you'll agree with the price.
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      11-01-2011, 07:45 AM   #11
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How low do you want to go? Do you want flush?

It sounds to me like you'd be happy with springs/shocks. You sound the same as me.

Coils are nice but having to worry about getting them dropped just right is a little bit of a pain. And if you don't want it real low and don't "EVER" plan on taking it to a track, then what's the point.

I have koni Yellows/H&R Sport and it's an awesome drop/ride. And I can adjust the dampening.

I got both used (if you watch every day you'll see someone selling these).
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