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      12-14-2017, 10:49 AM   #23
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At first, I was looking at springs but thought all of them were too low for my taste. Ended up with coilovers... and set them lower than most aftermarket springs, haha.
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      12-14-2017, 11:09 AM   #24
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I still love the look of your car, Matticus. It's so clean and tidy. Except those front brake rotors! For shame...

With DC roads, I can't blame you for not going with a drop as aggressive as the Eibachs, that would be horrific to drive in-town. However, with everyday driving, and pulling into a steep-ish driveway, all that scrapes are the little wind deflectors in front of the tires up front. I'm in Northern Virginia, very close to my least favorite place I've been to in the country (DC). The quality of DC roads is a disease, the closer you get, the worse they are, and the worse the drivers are.
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      12-14-2017, 11:51 AM   #25
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Quote:
Originally Posted by Esteban View Post
Car looks great, Matt. I have the BMW Performance springs as well (with BMW Perf. Suspension), and I also appreciate the fact that it is just a slight drop. 10mm lower and spring rates are increased 34% over the stock M Sport suspension. I'm on stock size 313 wheels with upsize tires 225/255, so a little different than your setup.

This gives me the confidence to drive most anywhere without worrying about scraping, but lessons the wheel gap some and gives a little more of an aggressive look. At times I wish I would've gone lower but all said and done I'm glad I didn't.
Same I think the height is perfect! What springs do you have? Do you know the "T" numbers?
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      12-14-2017, 12:03 PM   #26
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Originally Posted by Matticus91 View Post
Same I think the height is perfect! What springs do you have? Do you know the "T" numbers?
Don't know the "T" numbers. But the part numbers are:

front 31-33-6-788-893

rear 33-53-6-788-900

All the BMW Performance springs are pretty similar. Think they're based on the optional equipment of a particular car.
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      12-14-2017, 12:20 PM   #27
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Quote:
Originally Posted by Esteban View Post
Don't know the "T" numbers. But the part numbers are:

front 31-33-6-788-893

rear 33-53-6-788-900

All the BMW Performance springs are pretty similar. Think they're based on the optional equipment of a particular car.
Nice, I've tried finding information on spring rates for all of the different springs but it seems to be very inconsistent. No one knows for sure.
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      12-14-2017, 12:30 PM   #28
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Quote:
Originally Posted by Matticus91 View Post
Nice, I've tried finding information on spring rates for all of the different springs but it seems to be very inconsistent. No one knows for sure.
I think if you put your VIN into BMW ETK, it spits out the right PNs for springs.
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      12-14-2017, 12:35 PM   #29
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Quote:
Originally Posted by swagon View Post
I think if you put your VIN into BMW ETK, it spits out the right PNs for springs.
I can find the PN's and other info no problem, but spring rates are another story entirely.
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      12-14-2017, 01:44 PM   #30
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Got the car aligned yesterday, didn't take the pins out of the front shock mounts so front camber was limited but so far the car feels fantastic. Way more confident around corners than before, much better turn in, and way more responsive. The reduction in body roll is nothing short of astounding, it really feels like a sports car now and not some mushy sedan!

Spec sheet from the alignment is attached, and here's some bonus pics and the final product.

20171213_130751 by Matt Steele, on Flickr
20171213_134325 by Matt Steele, on Flickr
20171214_143432 by Matt Steele, on Flickr
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      12-14-2017, 02:25 PM   #31
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Quote:
Originally Posted by Matticus91 View Post
I can find the PN's and other info no problem, but spring rates are another story entirely.
Can someone tell me how to find the spring part no's using your VIN. I've gone thru the ETK site and can't find anything.
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      12-14-2017, 02:51 PM   #32
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Quote:
Originally Posted by gjm120 View Post
Can someone tell me how to find the spring part no's using your VIN. I've gone thru the ETK site and can't find anything.
You should be able to call your local BMW dealer's parts dept. and give them your VIN and tell them you'd like the part numbers for the BMW Performance springs that go with your car.
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      12-14-2017, 02:53 PM   #33
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Quote:
Originally Posted by Esteban View Post
You should be able to call your local BMW dealer's parts dept. and give them your VIN and tell them you'd like the part numbers for the BMW Performance springs that go with your car.
Yea - that's the easiest sure way.

Thanks.
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      12-14-2017, 02:55 PM   #34
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Quote:
Originally Posted by gjm120 View Post
Can someone tell me how to find the spring part no's using your VIN. I've gone thru the ETK site and can't find anything.
Enter VIN, do search, open options for Front Axle and then Rear Axle, and you'll see "coil spring" there for both. There may not be a part # as it's not always complete, but that's where it would be.

You could also call any BMW dealership, provide last 7 of VIN, and they can tell you what parts are on your car.
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      12-14-2017, 06:02 PM   #35
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Quote:
Originally Posted by Matticus91 View Post
Nice, I've tried finding information on spring rates for all of the different springs but it seems to be very inconsistent. No one knows for sure.
I've seen that, and did a ton of homework on it over the summer.
Didn't document all my sources, but tried to make sure at least 2 aligned before calling the value "good." If I found a source but could not corroborate it, I left those red.

Don't take it as gospel, but it should give you an idea of what to look at.
What I had more trouble getting was amount of lowering since it varies with car and configuration.

Spring Front / Rear rate (lbs/in)
135i(M-Sport) 120 / 350
E90 Sport 145 / 460
E90 BMWP 195 / 505
E90 M3 160 / 550
Dinan E82 144 / 490
Cobb E82 142 / 457
Swift E82 201 / 503
BMWP T1/T2 135 / 420
BMWP T2/T3 146 / 460
BMWP T3/T4 160 / 495
KW Street Comfort 286 / 572

Hard since nobody will talk to me about what configuration "belongs" on my LCI 135i E88.

P/N's appear to be 31336788891, 8892, & 8893 T1-T3 Front, and
33536788898, 8899 & 8900 T2 - T4 Rear.
Certainly do your own research if you're spending your money.
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      12-14-2017, 06:27 PM   #36
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I called a dealer and found out the appropriate performance springs for my car. They are ...892/...899 F/R. These are T2 / T3. This is exactly what I expected from digging up any info I could find.

My car has most options that I can think of (incl sunroof), so other than a 135i AT equipped the same, should be one of the heaviest coupes.
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      12-14-2017, 08:24 PM   #37
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Quote:
Originally Posted by tjswarbrick View Post
I've seen that, and did a ton of homework on it over the summer.
Didn't document all my sources, but tried to make sure at least 2 aligned before calling the value "good." If I found a source but could not corroborate it, I left those red.

Don't take it as gospel, but it should give you an idea of what to look at.
What I had more trouble getting was amount of lowering since it varies with car and configuration.

Spring Front / Rear rate (lbs/in)
135i(M-Sport) 120 / 350
E90 Sport 145 / 460
E90 BMWP 195 / 505
E90 M3 160 / 550
Dinan E82 144 / 490
Cobb E82 142 / 457
Swift E82 201 / 503
BMWP T1/T2 135 / 420
BMWP T2/T3 146 / 460
BMWP T3/T4 160 / 495
KW Street Comfort 286 / 572

Hard since nobody will talk to me about what configuration "belongs" on my LCI 135i E88.

P/N's appear to be 3133678891, 8892, & 8893 T1-T3 Front, and
33536788898, 8899 & 8900 T2 - T4 Rear.
Certainly do your own research if you're spending your money.
Thanks for the info. I think you're missing a digit though in the front Performance spring P/Ns. I think it's an 8. lol
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      12-14-2017, 11:08 PM   #38
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Quote:
Originally Posted by Esteban View Post
Thanks for the info. I think you're missing a digit though in the front Performance spring P/Ns. I think it's an 8. lol
You got me.
Fixed it.
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      12-15-2017, 08:03 AM   #39
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Quote:
Originally Posted by tjswarbrick View Post
Spring Front / Rear rate (lbs/in)
135i(M-Sport) 120 / 350
E90 Sport 145 / 460
E90 BMWP 195 / 505
E90 M3 160 / 550
Dinan E82 144 / 490
Cobb E82 142 / 457
Swift E82 201 / 503
BMWP T1/T2 135 / 420
BMWP T2/T3 146 / 460
BMWP T3/T4 160 / 495
KW Street Comfort 286 / 572
That's fantastic man great job digging this all up. I've found some conflicting information but this looks to match what I was able to confirm. Most of the info that I have on the performance suspension came from this thread, but I found a few posts to contradict each other.
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      04-10-2018, 09:46 AM   #40
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Quote:
Originally Posted by E30Lover View Post
I dunno man. My car looks lower with factory M Sport suspension. I'll have to get some pictures. maybe it's in my head.
Suspension has settled a bit since this pic, and I'm also on brand new mounts so if yours are stock they're probably a bit more compressed.

135iSnow2018-5 by Matt Steele, on Flickr
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      04-11-2018, 02:41 PM   #41
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So I am trying to decide on my suspension setup.
I was going to go BMW PS, but it seems no longer available, which makes me wonder if these springs are still available (the non-availability just happened within the last few weeks).
I have pretty well decided on Koni Yellows, but the springs are in question. It will either be Eibach Pro or these BMW, but again, I don't know if they will even be an option.

I'm not looking for an aggressive drop, and Boston area has some shitty roads too, so I'm liking your logic. It's my DD, so daily liveability is important.

I will also be getting M3 front control arms and M3 swaybar. I already have Whiteline inserts.
Currently running stock 18" 261's with wider 225/255 MPS4S. I may go to wider wheels (Apex) with even wider tires (235/265), but that is not set in stone yet.

Any thoughts on this setup (Koni Yellows and either Eibach or BMW springs) would be welcome.
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      04-11-2018, 04:51 PM   #42
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I'm not a fan of Koni dampers, especially the Single Adjustable yellow ones that people seem to default to. In my experience, Bilstein sport dampers offer better, more compliant handling for street and track use, all while maintaining the ability to shrug off road imperfections with minimal motion transferred to the vehicle. Their mono-tube and gas-pressure design also lends itself to much better longevity that Koni dampers. Additionally, the Bilsteins are backed by a better warranty and are rebuildable if the time ever comes. I've had multiple sets of Koni dampers fail over short periods of use, and at least two individual shocks that were DOA.

As far as springs are concerned, my favorites are Eibach or Dinan, but I've heard zero complaints about the the BMW Performance Suspension springs. I've tried H&R and wasn't particularly impressed, but wouldn't consider them a dealbreaker. Just thought the Eibach springs gave a better ride.
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      04-11-2018, 05:42 PM   #43
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I'm not a fan of Koni dampers, especially the Single Adjustable yellow ones that people seem to default to. In my experience, Bilstein sport dampers offer better, more compliant handling for street and track use, all while maintaining the ability to shrug off road imperfections with minimal motion transferred to the vehicle. Their mono-tube and gas-pressure design also lends itself to much better longevity that Koni dampers. Additionally, the Bilsteins are backed by a better warranty and are rebuildable if the time ever comes. I've had multiple sets of Koni dampers fail over short periods of use, and at least two individual shocks that were DOA.

As far as springs are concerned, my favorites are Eibach or Dinan, but I've heard zero complaints about the the BMW Performance Suspension springs. I've tried H&R and wasn't particularly impressed, but wouldn't consider them a dealbreaker. Just thought the Eibach springs gave a better ride.
Thanks for the input!
I'm not married to the Konis - I have just heard about recent quality problems from Bilstein from several places, but none of it is first-hand, that I know of.

I don't really want Coilovers, and I don't care about adjustability. I'm pretty much a set-it-and-forget-it guy. Like my tune. I don't want to tinker with it - I just want to find something I like and have it just work consistently, all day, every day.
Keep the suggestions coming!
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      04-11-2018, 06:13 PM   #44
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Quote:
Originally Posted by Cavpilot2k View Post
Thanks for the input!
I'm not married to the Konis - I have just heard about recent quality problems from Bilstein from several places, but none of it is first-hand, that I know of.

I don't really want Coilovers, and I don't care about adjustability. I'm pretty much a set-it-and-forget-it guy. Like my tune. I don't want to tinker with it - I just want to find something I like and have it just work consistently, all day, every day.
Keep the suggestions coming!
Here's a thread where a member had an issue with Bilstein:

Bilstein Denied my Warranty
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