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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 08-21-2015, 12:55 AM   #1
GoodEnough
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Springs Vs Coilovers (Daily Driver)

Hello, I was wondering your opinion on Springs vs Coilovers, I have read a couple of fourms on lowering springs for M3s, and non Ms and people were saying things about the front being higher than the rear? Im alittle confused about this, are all lowering springs like this? I was looking at H&Rs, seems to have the best reputation. Obviously springs cant give you the preformance as coils can, but I will be daily driving my car and I wanted a more easy solution considering I dont want to lower my car to the ground, or near it. I still want to be able to clear speed bumps, or go over them eaisly. (My schools parking lot and entrance is filled with them every 10 feet. Thank you.
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Old 08-21-2015, 01:09 AM   #2
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Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 08-21-2015, 01:15 AM   #3
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Good price, but I dont know anything about spring rates, or what Im getting myself into. Whats a good spring rate for daily driving? Thanks.
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Old 08-21-2015, 01:59 AM   #4
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Good price, but I dont know anything about spring rates, or what Im getting myself into. Whats a good spring rate for daily driving? Thanks.
If it were me, I'd pick the 380F & 500R as my DD. I'd also take the 445F & 600R as my aggressive driver / track springs.

E46 Suspensions like a Front to Rear spring rate ratio of roughly 25% to 50% more in the rear. Using this formula, multiply the front spring rate times about 33% & see what you get. Plus those "Special" Ground Control Koni's can easily handle either of those spring rates with NO problem. The other thing you don't currently realize is that Both the F&R dampers are Externally Adjustable, meaning it only takes seconds to adjust any of the four dampers. Being able to adjust all four dampers within seconds is worth its weight in gold.



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"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 08-21-2015, 11:48 AM   #5
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Originally Posted by Rob43 View Post
If it were me, I'd pick the 380F & 500R as my DD. I'd also take the 445F & 600R as my aggressive driver / track springs.

Both the F&R dampers are Externally Adjustable, meaning it only takes seconds to adjust any of the four dampers. Being able to adjust all four dampers within seconds is worth its weight in gold.

Rob43
I was going to suggest the 380 and 500 rates as well, and externally adjustable is KEY! I had Koni Yellows on my old car, the fronts were external, the rears had to be removed from the car, fully compressed, rotated, then reinstalled (so I set them once I never touched it again).

I used to put the fronts to full soft after going out for all you can eat sushi
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Old 08-22-2015, 02:20 PM   #6
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So if I wanted to lower the car does the whole shock body turn or do i have to compress the spring?
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Old 08-22-2015, 02:32 PM   #7
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So if I wanted to lower the car does the whole shock body turn or do i have to compress the spring?
Neither.

You insert a spanner wrench to lower or raise the circled adjusters. The springs are sitting on top of these adjusters & move up & down with them.


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I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 08-23-2015, 03:59 PM   #8
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Spring Rates

I agree with Rob43. A stagger between the front and rear will work best. My M3 came from the OP with 500/500 Koni based T C Kline SA. It was great on the street with the dampers turned from middle to all the way down. At the track, I would turn up the dampers and carry the inside front wheel on VIR Turn One. I switched to 500/600 and that solved that issue. Given that I drive hard on the track, I've moved to Nitron R3s with loose you teeth spring rates.

Good coilovers can be set up for excellent ride quality.

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Old 08-29-2015, 03:38 AM   #9
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just get some H&R springs.
the drop will be subtle and the springs "progressive rate". also H&R usually have more an even stance while Eibach often more of a "raked" stance, with the nose down.

coil-overs often have components/hardware that isn't isolated. this can cause clunks with the springs when they shift. coil-overs aren't for everyone. since prices are so low nowadays it's often a mistake made to buy when a stock design spring/damper is best suited for street use.
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Old 08-31-2015, 02:48 PM   #10
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Alex323Ci has it right. Just get H&R and koni and done. Better ride than stock and also more performance. Simple is better for DD. Ran the setup as well and loved it
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Old 09-15-2015, 01:33 AM   #11
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I'm currently running stock Sachs suspension with the eibach pro kit springs until my KW's come in, and it's not too bad. From what I've read the eibach pro kit is best for stock suspension. Click image for larger version

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Old 09-16-2015, 04:58 AM   #12
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eibach prokit and koni yellows is probably the best basic upgrade suspension for a daily, but can also be hustled along quickly.
i've moved onto coilovers with 8kg front and 11kg rears and its a big improvement in performance, but ride quality does suffer. imo, not necessary for only a daily.
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Old 09-18-2015, 10:47 PM   #13
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To be fair... all coilovers do is provide a strengthen ride and ability to go higher or lower. Springs to me seem cheap and provide nothing but a bunch of unstable bouncing.
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Old 09-18-2015, 11:10 PM   #14
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To be fair... all coilovers do is provide a strengthen ride and ability to go higher or lower. Springs to me seem cheap and provide nothing but a bunch of unstable bouncing.
This has everything to do with the quality of the dampers being used.


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SUMMIT POINT WV 1:24:229 SCCA
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 09-19-2015, 03:50 AM   #15
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To be fair... all coilovers do is provide a strengthen ride and ability to go higher or lower. Springs to me seem cheap and provide nothing but a bunch of unstable bouncing.
because coil-overs don't have "springs"
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CF CSL LIP - NAV- BMWP CF STRUT BAR - BMW GROUP N MNTS - GRUPPE M CF INTAKE - SUPERSPRINT - UUC S/S LINES, RTABs - H&R SWAYS - 4.10 M-SPORT DIFF
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Old 09-22-2015, 09:41 AM   #16
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This has everything to do with the quality of the dampers being used.


Rob43
Seconded because of how important this is. PLEASE do your research and properly pair your springs and dampers. This will make or break a suspension setup.
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Old 09-22-2015, 12:14 PM   #17
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Bilstein HD/Eibach pro kit springs. Eibach sway bars. You'll out handle any m3 on sub $2k coilovers and still ride like stock in terms of comfort. Coil overs suck on a daily.
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