What is the effect of lowering the M5 via springs? - BMW M5 Forum and M6 Forums
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post #1 of 6 Old 15th June 2008, 11:33 AM Thread Starter
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What is the effect of lowering the M5 via springs?

Some guys warned me against installing the Eibach springs as they believe it will degrade the performance of the car by throwing it off balance. They stated that BMW have done the research to get the car well balanced so it is silly of me to think I can improve it's turning performance by using after market springs.

Would love to hear what you guys think of this.
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post #2 of 6 Old 15th June 2008, 11:55 AM
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Originally Posted by leburpor View Post
Some guys warned me against installing the Eibach springs as they believe it will degrade the performance of the car by throwing it off balance. They stated that BMW have done the research to get the car well balanced so it is silly of me to think I can improve it's turning performance by using after market springs.

Would love to hear what you guys think of this.
Typical response, but their is some sort of compromise. typical response to their response is that the car handles better because it is firmer. I wouldn't say it throws the car out of balance. Makes the car a little more bouncy Do a search and make a decision also search out coilovers...

If you don't mind the stock height (I do) then just throw on Dinan sway bar and FRC (do a search) without springs is probably best for overall ride including around town driving...

It really can't be simplified. I believe the BMW set it up best for all conditions, but maybe you rather have it set up for certain consditions or driving style. For me KW Coilovers are the answer I hope...
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post #3 of 6 Old 15th June 2008, 10:48 PM
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i've had the eibach with Dinan sway and FRC and it's a great combo! Just a tad firmer, but by no means bone jarring or uncomfortable.

I would do it again without hesitation! I'm very sensitive about ride quality and I'd say this setup is a great one.

As far as degrading performance, i doubt it changed much. The lowering is quite mild and I think BMW didn't set it up this way to avoid people scrapping their front bumpers against those pesky parking stoppers.
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post #4 of 6 Old 15th June 2008, 11:20 PM
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A few negatives could be that the EDC shocks are not rated correctly with the springs ie: spring rate is not compatible with shock rate= bouncy ride.

The other thing is that as you lower the chassis the suspension control arms, sway bars and other ancillary parts do not work as harmoniously as they should.

The control arms are one specific part that is now in a different position than before and will not work to its full potential.

"Motion does not equal progress"...Cos
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post #5 of 6 Old 16th June 2008, 02:53 AM
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I've had Dinan Stage 2 with front roll control and upgraded rear antiroll bar on my car for 2 months and I couldn't be any happier. Granted the stock suspension was great, but it did roll a bit when attacking the corners. With the Dinan Stage 2 setup, ZERO roll. Ride height remains unchanged at the rear, but the front went down ~3/4 inch so it doesn't look so raised like stock. So far, I haven't had any problems with scraping. As stated in the manual, use EDC Sport (2 lights) to keep the front from scraping when navigating iffy driveways/slopes.

As for ride comfort/control: for comparison (in my opinion) ...
Stage 2 + EDC Comfort (zero lights) = EDC Normal (1 light) when stock.
Stage 2 + EDC Normal (1 light) approx. = EDC Sport (2 lights), but not as bouncy.
Stage 2 + EDC Sport (2 lights) = Race Car Bouncy and Harsh.

I normally drive in EDC Comfort, but have my MDrive set to EDC Normal. EDC Sport does make the ride a bit punishing unless the roads are nice and smooth.

Pics for ride height consideration:



Indianapolis Red Metallic
Black Merino Leather / Aluminum Trim
Invisi-Guard Paint Protection Film
Comfort Access / Active Seats / Rear Sunshades / High Beam Assistant / iPod & USB Adapter
Head-Up Display / SAT Radio / RTTI / Enhanced Premium Sound
Stage 2 Suspension / 19" Lightweight Spread-Forged Wheels on Michelin PS2s (265/35 f; 285/35 r)
Floor Mats / Free Flow Exhaust / Dinan Badge

2008 Suzuki GSX-R600: way more fun than an M5 while getting 50+ mpg highway!
1992 Honda Accord EX 5MT: 287,000+ trouble-free miles and going and going and ...
2006 BMW Dinan5 550i 6MT: retired
2003 Acura CL Type-S 6MT: retired
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post #6 of 6 Old 16th June 2008, 07:36 AM
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The factory setup is a good compromise, with great ride comfort and body clearance in trade for slightly reduced handling.

If you actively drive your beast and would like improved handling, an aftermarket suspension is the way to go.

My beast also has the Dinan Stage 2 suspension installed & I generally agree with Roleez's comments.

The Dinan setup significantly reduces roll & the ride comfort penalty is one ride control setting on generally smooth roads. On patched and bumpy roads the ride can be somewhat harsh but not punishing.

Dinan is releasing new front & rear springs with a softer ride, they say will actually improve handling. Run a forum seach on Dinan Stage 2 suspension for more info.

There are other good spring sets for our beasts. All will improve handling to a degree; the Dinan anti-roll components would be a good addition if you choose another brand.

Body height is another consideration. Different spring sets produce different ride heights. Some like the lowered look, with Dinan & the others, you'll have to be careful on steep driveways & parking in slots with a concrete curb at the front.

If you look at your stock ride height, notice there is more space between front tire and wheel well than at the rear. The Dinan setup evens out the gap front and rear.

Run a forum search and pick your products. Enjoy.

One more thing, unless you plan on heavy tracking your beast, avoid coilovers.

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