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      08-11-2018, 04:42 PM   #1
bmwlaguna
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128i Suspension improvement project

Non-sport model, never gonna track, I'm still running a fairly new square set of 205 Pirelli P7.

I just added an MSport front sway. And I picked up a set of barely used Goodyear Eagle Sports, mostly for being nonrunflat and 225's. I haven't put them on yet but they are kind of waiting to try for sh*ts & giggles. I wonder if even discount nonrunflats are better than runflats.

My next move I think is Whiteline inserts.
Then Koni Str.t kit with springs.

Any feedback appreciated.
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      08-11-2018, 10:04 PM   #2
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Good plan! I am running stock M sport suspension now, nonRFTs are first on my list. Then whitelines RSFB and finally a nice set of shocks and springs (thinking konis and H&R). would like a little bit of drop too. Want to run square but my fronts are 7 and rears are 7.5, so no rotating .
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      08-12-2018, 04:42 PM   #3
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Quote:
Originally Posted by SLO 1ER View Post
Some Koni shocks and springs would definitely be an improvement. There’s also the option of waiting for a used set of coilovers to pop up.

I would skip the inserts and do replacement RSFB instead. You’ll be much happier with that in the end.

I’d also look into M3 control Arms if your CA bushings are shot. You’ll get increased negative camber and a better bushing.
Went from non sport set up to this: non run flats; staggered 225 and 245 ;recently got eibach pro kit and Koni SAS
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      08-12-2018, 05:52 PM   #4
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My $.02 based on personal experience.

1. RSFB or 2 pc bushings or inserts, pick whatever you can afford. I did the inserts best mod I've done.

2. Front M3 control arms.

3. Rear differential bracket for $100 bucks from a forum member. 135droptop I think I was.

Then suspension. Personally I chose the Öhlins R&T. My next choice would have been KW v1, TCKline or the new KONI Special Actives with BMW performance springs.
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      08-12-2018, 07:49 PM   #5
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Quote:
Originally Posted by Gangplank View Post
My $.02 based on personal experience.



3. Rear differential bracket for $100 bucks from a forum member. 135droptop I think I was.
What problem does this part solve?
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      08-12-2018, 08:14 PM   #6
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The car in even stock form is fun to drive! I hear that OEM or Bilstein B4 is a better performer than Koni Str.t. I really like my Dinan performance springs but they only gave me a very slight drop, .5 just like they advertise so if you want to go noticeably lower I would look at Eibach or H&R.
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      08-12-2018, 08:36 PM   #7
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Quote:
Originally Posted by markslc1 View Post
Quote:
Originally Posted by Gangplank View Post
My $.02 based on personal experience.



3. Rear differential bracket for $100 bucks from a forum member. 135droptop I think I was.
What problem does this part solve?
It locks down the rear differential which has a lot of movement on the 135. It reduces the e-diff tendency to give "one tire fire" or wheel-hop on slow hard accel. cornering.
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      08-12-2018, 09:52 PM   #8
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What do you guys think about the Solo-Werks S1 Coilovers?
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      08-12-2018, 10:36 PM   #9
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I'm on Koni Str.t but I have M-sport suspension and kept the springs oem. If it's a daily driver I recommend this setup. If I did it over I'd have upgraded to camber plates add.

if its more then a daily or a toy I'd go Koni Sport and springs or Bilstien B12 kit

1M/M3 TRW arms a must as Gangplank suggested I would do them before inserts

Last edited by Tuxedo; 08-12-2018 at 10:48 PM..
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      08-13-2018, 12:39 AM   #10
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Here is my plan for what its worth:

Ordered one of the last remaining BMW Performance Suspensions. It finally arrived three days ago. Next step is to order the M3 rear subframe bushings and the M3/TRW Front control arms. Will install all of that at one time.

And then, once my current set of tires wear out, I'd like to go to a square setup of 17x7.5 with 225/45/r17.
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      08-13-2018, 08:57 PM   #11
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Quote:
Originally Posted by kaputt View Post
Here is my plan for what its worth:

Ordered one of the last remaining BMW Performance Suspensions. It finally arrived three days ago. Next step is to order the M3 rear subframe bushings and the M3/TRW Front control arms. Will install all of that at one time.

And then, once my current set of tires wear out, I'd like to go to a square setup of 17x7.5 with 225/45/r17.
This is a good plan that will yield a well balanced car, good luck and write up a review when done! While you are at it, and if you have brake upgrades planned, consider installing stainless brake lines since you need to disconnect them in the rear when you install your new subframe bushings. Will save you the hassle if you ever plan to do this in the future.
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      08-16-2018, 02:29 AM   #12
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I've decided to go the the Solo-Werks S1 coilovers, install being done next week.

I'm pretty sure I'm going to switch out my stock 205 runflats for a set of 225 regular tires- although they are a discount brand.
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      08-16-2018, 08:36 PM   #13
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"discount brand tire" is a big mistake unless its actually one of the medium priced tire from The Tire Rack.
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      08-17-2018, 11:00 PM   #14
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Quote:
Originally Posted by NorthernDancer View Post
"discount brand tire" is a big mistake unless its actually one of the medium priced tire from The Tire Rack.
They aren't a permanent solution but I picked them up cheap with 3K miles on them. Goodyear Eagle sport
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      09-12-2018, 03:24 PM   #15
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Kinda doing this with my own 128i. Just did the Black Powerflex thrust arm bushings, picked up some clean m261 wheels (gonna get some AS tires for em next month), but need a suspension refresh. Would the 135i Sport Suspension be any good? Can pick up Used Parts 15k miles for $100. Thanks guys!
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      09-12-2018, 04:06 PM   #16
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Quote:
Originally Posted by JesusHinojosa1 View Post
Kinda doing this with my own 128i. Just did the Black Powerflex thrust arm bushings, picked up some clean m261 wheels (gonna get some AS tires for em next month), but need a suspension refresh. Would the 135i Sport Suspension be any good? Can pick up Used Parts 15k miles for $100. Thanks guys!
Is your car a "sport" or "m-sport"? If so, then a 135i suspension will be the same basically (aside from some small spring rate differences and height to account for the higher weight of the 135).
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      09-12-2018, 04:10 PM   #17
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Quote:
Originally Posted by asbrr View Post
Is your car a "sport" or "m-sport"? If so, then a 135i suspension will be the same basically (aside from some small spring rate differences and height to account for the higher weight of the 135).
Nope just a base 128i. Still worth it at $140 shipped?
I don't want to spend too much on the car, as im looking to move into another 128i Sport and supercharge it next year LOL. But i wanna keep the car running and driving well.
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      09-12-2018, 04:16 PM   #18
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Quote:
Originally Posted by JesusHinojosa1 View Post
Nope just a base 128i. Still worth it at $140 shipped?
I don't want to spend too much on the car, as im looking to move into another 128i Sport and supercharge it next year LOL. But i wanna keep the car running and driving well.
How old is it? If the shocks aren't leaking and it's not super high miles, not a bad deal. It may sit a tad higher in the front than a 128i sport, but it will be lower and stiffer than your non-sport.

Look for a front swaybar if you can get it cheap as well...might as well stick it in there while you're at it.
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      09-12-2018, 08:35 PM   #19
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Quote:
Originally Posted by asbrr View Post
How old is it? If the shocks aren't leaking and it's not super high miles, not a bad deal. It may sit a tad higher in the front than a 128i sport, but it will be lower and stiffer than your non-sport.

Look for a front swaybar if you can get it cheap as well...might as well stick it in there while you're at it.
Current non sport set up has 66k and is pretty much dead. The Used 135i M Sport suspension has 20k miles and in good working condition. I have the M261 wheels on it currently, so it'll sit like a stock 135i Right?
Thanks for the help dude
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      09-13-2018, 02:37 PM   #20
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Quote:
Originally Posted by JesusHinojosa1 View Post
Current non sport set up has 66k and is pretty much dead. The Used 135i M Sport suspension has 20k miles and in good working condition. I have the M261 wheels on it currently, so it'll sit like a stock 135i Right?
Thanks for the help dude
Should be pretty close to a normal 135i height, maybe a few mm higher at the front. No problem and good luck!

PS: Make sure you get the bump stops, as they will be shorter/different than your stock non-sport ones. They are part of the front struts so if you're buying the struts pre-assembled then all good, the rears are separate so if they are not included, maybe order a set (they are cheap parts).
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      09-13-2018, 03:37 PM   #21
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Quote:
Originally Posted by JesusHinojosa1 View Post
Current non sport set up has 66k and is pretty much dead. The Used 135i M Sport suspension has 20k miles and in good working condition. I have the M261 wheels on it currently, so it'll sit like a stock 135i Right?
Thanks for the help dude
If you think you will be keeping the springs for a long time, you should consider changing the struts/shocks out. If you are trying to keep the spend down look at Bilstein OE replacements (B4 I think and not too pricey). The logic here is the time and/or expense of changing out the dampers - especially the fronts - is high.
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      09-13-2018, 08:41 PM   #22
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Quote:
Originally Posted by gjm120 View Post
If you think you will be keeping the springs for a long time, you should consider changing the struts/shocks out. If you are trying to keep the spend down look at Bilstein OE replacements (B4 I think and not too pricey). The logic here is the time and/or expense of changing out the dampers - especially the fronts - is high.
Probably will just swap old stock suspension with the working 135i suspension and keep it like that for a while. ill see if i can find a sway bar set up for cheap.
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